repos/blastem: zlib/deflate.c annotate

annotate zlib/deflate.c @ 1557:a0fbb1e90533

Fix Z80 bank access for $800000-$A00000 region for 10M flat mapped ROMs

author	Michael Pavone <pavone@retrodev.com>
date	Mon, 02 Apr 2018 00:11:43 -0700
parents	00d788dac91a
children

rev	line source
1530 00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1 /* deflate.c -- compress data using the deflation algorithm
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2 * Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	3 * For conditions of distribution and use, see copyright notice in zlib.h
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	4 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	5
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	6 /*
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	7 * ALGORITHM
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	8 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	9 * The "deflation" process depends on being able to identify portions
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	10 * of the input text which are identical to earlier input (within a
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	11 * sliding window trailing behind the input currently being processed).
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	12 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	13 * The most straightforward technique turns out to be the fastest for
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	14 * most input files: try all possible matches and select the longest.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	15 * The key feature of this algorithm is that insertions into the string
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	16 * dictionary are very simple and thus fast, and deletions are avoided
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	17 * completely. Insertions are performed at each input character, whereas
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	18 * string matches are performed only when the previous match ends. So it
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	19 * is preferable to spend more time in matches to allow very fast string
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	20 * insertions and avoid deletions. The matching algorithm for small
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	21 * strings is inspired from that of Rabin & Karp. A brute force approach
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	22 * is used to find longer strings when a small match has been found.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	23 * A similar algorithm is used in comic (by Jan-Mark Wams) and freeze
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	24 * (by Leonid Broukhis).
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	25 * A previous version of this file used a more sophisticated algorithm
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	26 * (by Fiala and Greene) which is guaranteed to run in linear amortized
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	27 * time, but has a larger average cost, uses more memory and is patented.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	28 * However the F&G algorithm may be faster for some highly redundant
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	29 * files if the parameter max_chain_length (described below) is too large.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	30 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	31 * ACKNOWLEDGEMENTS
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	32 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	33 * The idea of lazy evaluation of matches is due to Jan-Mark Wams, and
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	34 * I found it in 'freeze' written by Leonid Broukhis.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	35 * Thanks to many people for bug reports and testing.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	36 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	37 * REFERENCES
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	38 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	39 * Deutsch, L.P.,"DEFLATE Compressed Data Format Specification".
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	40 * Available in http://tools.ietf.org/html/rfc1951
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	41 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	42 * A description of the Rabin and Karp algorithm is given in the book
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	43 * "Algorithms" by R. Sedgewick, Addison-Wesley, p252.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	44 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	45 * Fiala,E.R., and Greene,D.H.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	46 * Data Compression with Finite Windows, Comm.ACM, 32,4 (1989) 490-595
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	47 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	48 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	49
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	50 /* @(#) $Id$ */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	51
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	52 #include "deflate.h"
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	53
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	54 const char deflate_copyright[] =
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	55 " deflate 1.2.11 Copyright 1995-2017 Jean-loup Gailly and Mark Adler ";
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	56 /*
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	57 If you use the zlib library in a product, an acknowledgment is welcome
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	58 in the documentation of your product. If for some reason you cannot
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	59 include such an acknowledgment, I would appreciate that you keep this
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	60 copyright string in the executable of your product.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	61 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	62
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	63 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	64 * Function prototypes.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	65 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	66 typedef enum {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	67 need_more, /* block not completed, need more input or more output */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	68 block_done, /* block flush performed */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	69 finish_started, /* finish started, need only more output at next deflate */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	70 finish_done /* finish done, accept no more input or output */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	71 } block_state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	72
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	73 typedef block_state (compress_func) OF((deflate_state s, int flush));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	74 /* Compression function. Returns the block state after the call. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	75
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	76 local int deflateStateCheck OF((z_streamp strm));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	77 local void slide_hash OF((deflate_state *s));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	78 local void fill_window OF((deflate_state *s));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	79 local block_state deflate_stored OF((deflate_state *s, int flush));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	80 local block_state deflate_fast OF((deflate_state *s, int flush));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	81 #ifndef FASTEST
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	82 local block_state deflate_slow OF((deflate_state *s, int flush));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	83 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	84 local block_state deflate_rle OF((deflate_state *s, int flush));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	85 local block_state deflate_huff OF((deflate_state *s, int flush));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	86 local void lm_init OF((deflate_state *s));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	87 local void putShortMSB OF((deflate_state *s, uInt b));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	88 local void flush_pending OF((z_streamp strm));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	89 local unsigned read_buf OF((z_streamp strm, Bytef *buf, unsigned size));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	90 #ifdef ASMV
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	91 # pragma message("Assembler code may have bugs -- use at your own risk")
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	92 void match_init OF((void)); /* asm code initialization */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	93 uInt longest_match OF((deflate_state *s, IPos cur_match));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	94 #else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	95 local uInt longest_match OF((deflate_state *s, IPos cur_match));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	96 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	97
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	98 #ifdef ZLIB_DEBUG
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	99 local void check_match OF((deflate_state *s, IPos start, IPos match,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	100 int length));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	101 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	102
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	103 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	104 * Local data
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	105 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	106
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	107 #define NIL 0
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	108 /* Tail of hash chains */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	109
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	110 #ifndef TOO_FAR
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	111 # define TOO_FAR 4096
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	112 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	113 /* Matches of length 3 are discarded if their distance exceeds TOO_FAR */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	114
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	115 /* Values for max_lazy_match, good_match and max_chain_length, depending on
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	116 * the desired pack level (0..9). The values given below have been tuned to
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	117 * exclude worst case performance for pathological files. Better values may be
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	118 * found for specific files.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	119 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	120 typedef struct config_s {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	121 ush good_length; /* reduce lazy search above this match length */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	122 ush max_lazy; /* do not perform lazy search above this match length */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	123 ush nice_length; /* quit search above this match length */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	124 ush max_chain;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	125 compress_func func;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	126 } config;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	127
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	128 #ifdef FASTEST
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	129 local const config configuration_table[2] = {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	130 /* good lazy nice chain */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	131 /* 0 / {0, 0, 0, 0, deflate_stored}, / store only */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	132 /* 1 / {4, 4, 8, 4, deflate_fast}}; / max speed, no lazy matches */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	133 #else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	134 local const config configuration_table[10] = {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	135 /* good lazy nice chain */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	136 /* 0 / {0, 0, 0, 0, deflate_stored}, / store only */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	137 /* 1 / {4, 4, 8, 4, deflate_fast}, / max speed, no lazy matches */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	138 /* 2 */ {4, 5, 16, 8, deflate_fast},
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	139 /* 3 */ {4, 6, 32, 32, deflate_fast},
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	140
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	141 /* 4 / {4, 4, 16, 16, deflate_slow}, / lazy matches */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	142 /* 5 */ {8, 16, 32, 32, deflate_slow},
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	143 /* 6 */ {8, 16, 128, 128, deflate_slow},
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	144 /* 7 */ {8, 32, 128, 256, deflate_slow},
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	145 /* 8 */ {32, 128, 258, 1024, deflate_slow},
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	146 /* 9 / {32, 258, 258, 4096, deflate_slow}}; / max compression */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	147 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	148
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	149 /* Note: the deflate() code requires max_lazy >= MIN_MATCH and max_chain >= 4
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	150 * For deflate_fast() (levels <= 3) good is ignored and lazy has a different
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	151 * meaning.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	152 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	153
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	154 /* rank Z_BLOCK between Z_NO_FLUSH and Z_PARTIAL_FLUSH */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	155 #define RANK(f) (((f) * 2) - ((f) > 4 ? 9 : 0))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	156
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	157 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	158 * Update a hash value with the given input byte
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	159 * IN assertion: all calls to UPDATE_HASH are made with consecutive input
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	160 * characters, so that a running hash key can be computed from the previous
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	161 * key instead of complete recalculation each time.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	162 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	163 #define UPDATE_HASH(s,h,c) (h = (((h)<<s->hash_shift) ^ (c)) & s->hash_mask)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	164
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	165
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	166 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	167 * Insert string str in the dictionary and set match_head to the previous head
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	168 * of the hash chain (the most recent string with same hash key). Return
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	169 * the previous length of the hash chain.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	170 * If this file is compiled with -DFASTEST, the compression level is forced
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	171 * to 1, and no hash chains are maintained.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	172 * IN assertion: all calls to INSERT_STRING are made with consecutive input
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	173 * characters and the first MIN_MATCH bytes of str are valid (except for
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	174 * the last MIN_MATCH-1 bytes of the input file).
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	175 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	176 #ifdef FASTEST
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	177 #define INSERT_STRING(s, str, match_head) \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	178 (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	179 match_head = s->head[s->ins_h], \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	180 s->head[s->ins_h] = (Pos)(str))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	181 #else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	182 #define INSERT_STRING(s, str, match_head) \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	183 (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	184 match_head = s->prev[(str) & s->w_mask] = s->head[s->ins_h], \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	185 s->head[s->ins_h] = (Pos)(str))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	186 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	187
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	188 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	189 * Initialize the hash table (avoiding 64K overflow for 16 bit systems).
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	190 * prev[] will be initialized on the fly.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	191 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	192 #define CLEAR_HASH(s) \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	193 s->head[s->hash_size-1] = NIL; \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	194 zmemzero((Bytef )s->head, (unsigned)(s->hash_size-1)sizeof(*s->head));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	195
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	196 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	197 * Slide the hash table when sliding the window down (could be avoided with 32
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	198 * bit values at the expense of memory usage). We slide even when level == 0 to
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	199 * keep the hash table consistent if we switch back to level > 0 later.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	200 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	201 local void slide_hash(s)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	202 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	203 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	204 unsigned n, m;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	205 Posf *p;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	206 uInt wsize = s->w_size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	207
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	208 n = s->hash_size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	209 p = &s->head[n];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	210 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	211 m = *--p;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	212 *p = (Pos)(m >= wsize ? m - wsize : NIL);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	213 } while (--n);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	214 n = wsize;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	215 #ifndef FASTEST
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	216 p = &s->prev[n];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	217 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	218 m = *--p;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	219 *p = (Pos)(m >= wsize ? m - wsize : NIL);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	220 /* If n is not on any hash chain, prev[n] is garbage but
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	221 * its value will never be used.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	222 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	223 } while (--n);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	224 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	225 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	226
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	227 /* ========================================================================= */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	228 int ZEXPORT deflateInit_(strm, level, version, stream_size)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	229 z_streamp strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	230 int level;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	231 const char *version;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	232 int stream_size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	233 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	234 return deflateInit2_(strm, level, Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	235 Z_DEFAULT_STRATEGY, version, stream_size);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	236 /* To do: ignore strm->next_in if we use it as window */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	237 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	238
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	239 /* ========================================================================= */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	240 int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	241 version, stream_size)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	242 z_streamp strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	243 int level;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	244 int method;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	245 int windowBits;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	246 int memLevel;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	247 int strategy;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	248 const char *version;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	249 int stream_size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	250 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	251 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	252 int wrap = 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	253 static const char my_version[] = ZLIB_VERSION;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	254
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	255 ushf *overlay;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	256 /* We overlay pending_buf and d_buf+l_buf. This works since the average
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	257 * output size for (length,distance) codes is <= 24 bits.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	258 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	259
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	260 if (version == Z_NULL \|\| version[0] != my_version[0] \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	261 stream_size != sizeof(z_stream)) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	262 return Z_VERSION_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	263 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	264 if (strm == Z_NULL) return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	265
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	266 strm->msg = Z_NULL;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	267 if (strm->zalloc == (alloc_func)0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	268 #ifdef Z_SOLO
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	269 return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	270 #else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	271 strm->zalloc = zcalloc;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	272 strm->opaque = (voidpf)0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	273 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	274 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	275 if (strm->zfree == (free_func)0)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	276 #ifdef Z_SOLO
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	277 return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	278 #else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	279 strm->zfree = zcfree;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	280 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	281
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	282 #ifdef FASTEST
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	283 if (level != 0) level = 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	284 #else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	285 if (level == Z_DEFAULT_COMPRESSION) level = 6;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	286 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	287
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	288 if (windowBits < 0) { /* suppress zlib wrapper */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	289 wrap = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	290 windowBits = -windowBits;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	291 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	292 #ifdef GZIP
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	293 else if (windowBits > 15) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	294 wrap = 2; /* write gzip wrapper instead */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	295 windowBits -= 16;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	296 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	297 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	298 if (memLevel < 1 \|\| memLevel > MAX_MEM_LEVEL \|\| method != Z_DEFLATED \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	299 windowBits < 8 \|\| windowBits > 15 \|\| level < 0 \|\| level > 9 \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	300 strategy < 0 \|\| strategy > Z_FIXED \|\| (windowBits == 8 && wrap != 1)) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	301 return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	302 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	303 if (windowBits == 8) windowBits = 9; /* until 256-byte window bug fixed */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	304 s = (deflate_state *) ZALLOC(strm, 1, sizeof(deflate_state));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	305 if (s == Z_NULL) return Z_MEM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	306 strm->state = (struct internal_state FAR *)s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	307 s->strm = strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	308 s->status = INIT_STATE; /* to pass state test in deflateReset() */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	309
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	310 s->wrap = wrap;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	311 s->gzhead = Z_NULL;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	312 s->w_bits = (uInt)windowBits;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	313 s->w_size = 1 << s->w_bits;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	314 s->w_mask = s->w_size - 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	315
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	316 s->hash_bits = (uInt)memLevel + 7;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	317 s->hash_size = 1 << s->hash_bits;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	318 s->hash_mask = s->hash_size - 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	319 s->hash_shift = ((s->hash_bits+MIN_MATCH-1)/MIN_MATCH);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	320
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	321 s->window = (Bytef ) ZALLOC(strm, s->w_size, 2sizeof(Byte));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	322 s->prev = (Posf *) ZALLOC(strm, s->w_size, sizeof(Pos));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	323 s->head = (Posf *) ZALLOC(strm, s->hash_size, sizeof(Pos));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	324
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	325 s->high_water = 0; /* nothing written to s->window yet */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	326
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	327 s->lit_bufsize = 1 << (memLevel + 6); /* 16K elements by default */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	328
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	329 overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	330 s->pending_buf = (uchf *) overlay;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	331 s->pending_buf_size = (ulg)s->lit_bufsize * (sizeof(ush)+2L);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	332
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	333 if (s->window == Z_NULL \|\| s->prev == Z_NULL \|\| s->head == Z_NULL \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	334 s->pending_buf == Z_NULL) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	335 s->status = FINISH_STATE;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	336 strm->msg = ERR_MSG(Z_MEM_ERROR);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	337 deflateEnd (strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	338 return Z_MEM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	339 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	340 s->d_buf = overlay + s->lit_bufsize/sizeof(ush);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	341 s->l_buf = s->pending_buf + (1+sizeof(ush))*s->lit_bufsize;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	342
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	343 s->level = level;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	344 s->strategy = strategy;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	345 s->method = (Byte)method;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	346
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	347 return deflateReset(strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	348 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	349
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	350 /* =========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	351 * Check for a valid deflate stream state. Return 0 if ok, 1 if not.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	352 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	353 local int deflateStateCheck (strm)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	354 z_streamp strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	355 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	356 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	357 if (strm == Z_NULL \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	358 strm->zalloc == (alloc_func)0 \|\| strm->zfree == (free_func)0)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	359 return 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	360 s = strm->state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	361 if (s == Z_NULL \|\| s->strm != strm \|\| (s->status != INIT_STATE &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	362 #ifdef GZIP
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	363 s->status != GZIP_STATE &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	364 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	365 s->status != EXTRA_STATE &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	366 s->status != NAME_STATE &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	367 s->status != COMMENT_STATE &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	368 s->status != HCRC_STATE &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	369 s->status != BUSY_STATE &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	370 s->status != FINISH_STATE))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	371 return 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	372 return 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	373 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	374
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	375 /* ========================================================================= */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	376 int ZEXPORT deflateSetDictionary (strm, dictionary, dictLength)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	377 z_streamp strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	378 const Bytef *dictionary;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	379 uInt dictLength;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	380 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	381 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	382 uInt str, n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	383 int wrap;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	384 unsigned avail;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	385 z_const unsigned char *next;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	386
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	387 if (deflateStateCheck(strm) \|\| dictionary == Z_NULL)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	388 return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	389 s = strm->state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	390 wrap = s->wrap;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	391 if (wrap == 2 \|\| (wrap == 1 && s->status != INIT_STATE) \|\| s->lookahead)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	392 return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	393
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	394 /* when using zlib wrappers, compute Adler-32 for provided dictionary */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	395 if (wrap == 1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	396 strm->adler = adler32(strm->adler, dictionary, dictLength);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	397 s->wrap = 0; /* avoid computing Adler-32 in read_buf */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	398
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	399 /* if dictionary would fill window, just replace the history */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	400 if (dictLength >= s->w_size) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	401 if (wrap == 0) { /* already empty otherwise */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	402 CLEAR_HASH(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	403 s->strstart = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	404 s->block_start = 0L;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	405 s->insert = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	406 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	407 dictionary += dictLength - s->w_size; /* use the tail */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	408 dictLength = s->w_size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	409 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	410
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	411 /* insert dictionary into window and hash */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	412 avail = strm->avail_in;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	413 next = strm->next_in;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	414 strm->avail_in = dictLength;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	415 strm->next_in = (z_const Bytef *)dictionary;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	416 fill_window(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	417 while (s->lookahead >= MIN_MATCH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	418 str = s->strstart;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	419 n = s->lookahead - (MIN_MATCH-1);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	420 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	421 UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	422 #ifndef FASTEST
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	423 s->prev[str & s->w_mask] = s->head[s->ins_h];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	424 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	425 s->head[s->ins_h] = (Pos)str;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	426 str++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	427 } while (--n);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	428 s->strstart = str;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	429 s->lookahead = MIN_MATCH-1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	430 fill_window(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	431 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	432 s->strstart += s->lookahead;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	433 s->block_start = (long)s->strstart;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	434 s->insert = s->lookahead;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	435 s->lookahead = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	436 s->match_length = s->prev_length = MIN_MATCH-1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	437 s->match_available = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	438 strm->next_in = next;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	439 strm->avail_in = avail;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	440 s->wrap = wrap;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	441 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	442 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	443
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	444 /* ========================================================================= */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	445 int ZEXPORT deflateGetDictionary (strm, dictionary, dictLength)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	446 z_streamp strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	447 Bytef *dictionary;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	448 uInt *dictLength;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	449 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	450 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	451 uInt len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	452
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	453 if (deflateStateCheck(strm))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	454 return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	455 s = strm->state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	456 len = s->strstart + s->lookahead;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	457 if (len > s->w_size)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	458 len = s->w_size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	459 if (dictionary != Z_NULL && len)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	460 zmemcpy(dictionary, s->window + s->strstart + s->lookahead - len, len);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	461 if (dictLength != Z_NULL)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	462 *dictLength = len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	463 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	464 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	465
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	466 /* ========================================================================= */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	467 int ZEXPORT deflateResetKeep (strm)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	468 z_streamp strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	469 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	470 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	471
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	472 if (deflateStateCheck(strm)) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	473 return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	474 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	475
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	476 strm->total_in = strm->total_out = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	477 strm->msg = Z_NULL; /* use zfree if we ever allocate msg dynamically */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	478 strm->data_type = Z_UNKNOWN;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	479
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	480 s = (deflate_state *)strm->state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	481 s->pending = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	482 s->pending_out = s->pending_buf;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	483
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	484 if (s->wrap < 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	485 s->wrap = -s->wrap; /* was made negative by deflate(..., Z_FINISH); */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	486 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	487 s->status =
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	488 #ifdef GZIP
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	489 s->wrap == 2 ? GZIP_STATE :
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	490 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	491 s->wrap ? INIT_STATE : BUSY_STATE;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	492 strm->adler =
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	493 #ifdef GZIP
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	494 s->wrap == 2 ? crc32(0L, Z_NULL, 0) :
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	495 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	496 adler32(0L, Z_NULL, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	497 s->last_flush = Z_NO_FLUSH;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	498
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	499 _tr_init(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	500
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	501 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	502 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	503
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	504 /* ========================================================================= */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	505 int ZEXPORT deflateReset (strm)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	506 z_streamp strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	507 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	508 int ret;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	509
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	510 ret = deflateResetKeep(strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	511 if (ret == Z_OK)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	512 lm_init(strm->state);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	513 return ret;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	514 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	515
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	516 /* ========================================================================= */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	517 int ZEXPORT deflateSetHeader (strm, head)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	518 z_streamp strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	519 gz_headerp head;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	520 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	521 if (deflateStateCheck(strm) \|\| strm->state->wrap != 2)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	522 return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	523 strm->state->gzhead = head;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	524 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	525 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	526
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	527 /* ========================================================================= */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	528 int ZEXPORT deflatePending (strm, pending, bits)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	529 unsigned *pending;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	530 int *bits;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	531 z_streamp strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	532 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	533 if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	534 if (pending != Z_NULL)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	535 *pending = strm->state->pending;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	536 if (bits != Z_NULL)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	537 *bits = strm->state->bi_valid;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	538 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	539 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	540
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	541 /* ========================================================================= */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	542 int ZEXPORT deflatePrime (strm, bits, value)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	543 z_streamp strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	544 int bits;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	545 int value;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	546 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	547 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	548 int put;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	549
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	550 if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	551 s = strm->state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	552 if ((Bytef *)(s->d_buf) < s->pending_out + ((Buf_size + 7) >> 3))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	553 return Z_BUF_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	554 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	555 put = Buf_size - s->bi_valid;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	556 if (put > bits)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	557 put = bits;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	558 s->bi_buf \|= (ush)((value & ((1 << put) - 1)) << s->bi_valid);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	559 s->bi_valid += put;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	560 _tr_flush_bits(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	561 value >>= put;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	562 bits -= put;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	563 } while (bits);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	564 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	565 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	566
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	567 /* ========================================================================= */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	568 int ZEXPORT deflateParams(strm, level, strategy)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	569 z_streamp strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	570 int level;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	571 int strategy;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	572 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	573 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	574 compress_func func;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	575
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	576 if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	577 s = strm->state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	578
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	579 #ifdef FASTEST
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	580 if (level != 0) level = 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	581 #else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	582 if (level == Z_DEFAULT_COMPRESSION) level = 6;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	583 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	584 if (level < 0 \|\| level > 9 \|\| strategy < 0 \|\| strategy > Z_FIXED) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	585 return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	586 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	587 func = configuration_table[s->level].func;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	588
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	589 if ((strategy != s->strategy \|\| func != configuration_table[level].func) &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	590 s->high_water) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	591 /* Flush the last buffer: */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	592 int err = deflate(strm, Z_BLOCK);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	593 if (err == Z_STREAM_ERROR)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	594 return err;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	595 if (strm->avail_out == 0)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	596 return Z_BUF_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	597 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	598 if (s->level != level) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	599 if (s->level == 0 && s->matches != 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	600 if (s->matches == 1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	601 slide_hash(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	602 else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	603 CLEAR_HASH(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	604 s->matches = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	605 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	606 s->level = level;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	607 s->max_lazy_match = configuration_table[level].max_lazy;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	608 s->good_match = configuration_table[level].good_length;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	609 s->nice_match = configuration_table[level].nice_length;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	610 s->max_chain_length = configuration_table[level].max_chain;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	611 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	612 s->strategy = strategy;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	613 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	614 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	615
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	616 /* ========================================================================= */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	617 int ZEXPORT deflateTune(strm, good_length, max_lazy, nice_length, max_chain)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	618 z_streamp strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	619 int good_length;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	620 int max_lazy;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	621 int nice_length;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	622 int max_chain;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	623 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	624 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	625
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	626 if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	627 s = strm->state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	628 s->good_match = (uInt)good_length;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	629 s->max_lazy_match = (uInt)max_lazy;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	630 s->nice_match = nice_length;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	631 s->max_chain_length = (uInt)max_chain;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	632 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	633 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	634
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	635 /* =========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	636 * For the default windowBits of 15 and memLevel of 8, this function returns
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	637 * a close to exact, as well as small, upper bound on the compressed size.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	638 * They are coded as constants here for a reason--if the #define's are
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	639 * changed, then this function needs to be changed as well. The return
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	640 * value for 15 and 8 only works for those exact settings.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	641 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	642 * For any setting other than those defaults for windowBits and memLevel,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	643 * the value returned is a conservative worst case for the maximum expansion
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	644 * resulting from using fixed blocks instead of stored blocks, which deflate
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	645 * can emit on compressed data for some combinations of the parameters.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	646 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	647 * This function could be more sophisticated to provide closer upper bounds for
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	648 * every combination of windowBits and memLevel. But even the conservative
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	649 * upper bound of about 14% expansion does not seem onerous for output buffer
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	650 * allocation.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	651 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	652 uLong ZEXPORT deflateBound(strm, sourceLen)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	653 z_streamp strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	654 uLong sourceLen;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	655 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	656 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	657 uLong complen, wraplen;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	658
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	659 /* conservative upper bound for compressed data */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	660 complen = sourceLen +
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	661 ((sourceLen + 7) >> 3) + ((sourceLen + 63) >> 6) + 5;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	662
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	663 /* if can't get parameters, return conservative bound plus zlib wrapper */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	664 if (deflateStateCheck(strm))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	665 return complen + 6;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	666
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	667 /* compute wrapper length */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	668 s = strm->state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	669 switch (s->wrap) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	670 case 0: /* raw deflate */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	671 wraplen = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	672 break;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	673 case 1: /* zlib wrapper */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	674 wraplen = 6 + (s->strstart ? 4 : 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	675 break;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	676 #ifdef GZIP
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	677 case 2: /* gzip wrapper */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	678 wraplen = 18;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	679 if (s->gzhead != Z_NULL) { /* user-supplied gzip header */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	680 Bytef *str;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	681 if (s->gzhead->extra != Z_NULL)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	682 wraplen += 2 + s->gzhead->extra_len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	683 str = s->gzhead->name;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	684 if (str != Z_NULL)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	685 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	686 wraplen++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	687 } while (*str++);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	688 str = s->gzhead->comment;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	689 if (str != Z_NULL)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	690 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	691 wraplen++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	692 } while (*str++);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	693 if (s->gzhead->hcrc)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	694 wraplen += 2;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	695 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	696 break;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	697 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	698 default: /* for compiler happiness */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	699 wraplen = 6;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	700 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	701
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	702 /* if not default parameters, return conservative bound */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	703 if (s->w_bits != 15 \|\| s->hash_bits != 8 + 7)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	704 return complen + wraplen;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	705
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	706 /* default settings: return tight bound for that case */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	707 return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	708 (sourceLen >> 25) + 13 - 6 + wraplen;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	709 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	710
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	711 /* =========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	712 * Put a short in the pending buffer. The 16-bit value is put in MSB order.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	713 * IN assertion: the stream state is correct and there is enough room in
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	714 * pending_buf.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	715 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	716 local void putShortMSB (s, b)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	717 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	718 uInt b;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	719 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	720 put_byte(s, (Byte)(b >> 8));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	721 put_byte(s, (Byte)(b & 0xff));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	722 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	723
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	724 /* =========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	725 * Flush as much pending output as possible. All deflate() output, except for
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	726 * some deflate_stored() output, goes through this function so some
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	727 * applications may wish to modify it to avoid allocating a large
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	728 * strm->next_out buffer and copying into it. (See also read_buf()).
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	729 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	730 local void flush_pending(strm)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	731 z_streamp strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	732 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	733 unsigned len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	734 deflate_state *s = strm->state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	735
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	736 _tr_flush_bits(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	737 len = s->pending;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	738 if (len > strm->avail_out) len = strm->avail_out;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	739 if (len == 0) return;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	740
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	741 zmemcpy(strm->next_out, s->pending_out, len);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	742 strm->next_out += len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	743 s->pending_out += len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	744 strm->total_out += len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	745 strm->avail_out -= len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	746 s->pending -= len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	747 if (s->pending == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	748 s->pending_out = s->pending_buf;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	749 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	750 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	751
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	752 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	753 * Update the header CRC with the bytes s->pending_buf[beg..s->pending - 1].
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	754 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	755 #define HCRC_UPDATE(beg) \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	756 do { \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	757 if (s->gzhead->hcrc && s->pending > (beg)) \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	758 strm->adler = crc32(strm->adler, s->pending_buf + (beg), \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	759 s->pending - (beg)); \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	760 } while (0)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	761
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	762 /* ========================================================================= */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	763 int ZEXPORT deflate (strm, flush)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	764 z_streamp strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	765 int flush;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	766 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	767 int old_flush; /* value of flush param for previous deflate call */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	768 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	769
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	770 if (deflateStateCheck(strm) \|\| flush > Z_BLOCK \|\| flush < 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	771 return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	772 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	773 s = strm->state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	774
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	775 if (strm->next_out == Z_NULL \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	776 (strm->avail_in != 0 && strm->next_in == Z_NULL) \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	777 (s->status == FINISH_STATE && flush != Z_FINISH)) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	778 ERR_RETURN(strm, Z_STREAM_ERROR);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	779 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	780 if (strm->avail_out == 0) ERR_RETURN(strm, Z_BUF_ERROR);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	781
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	782 old_flush = s->last_flush;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	783 s->last_flush = flush;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	784
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	785 /* Flush as much pending output as possible */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	786 if (s->pending != 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	787 flush_pending(strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	788 if (strm->avail_out == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	789 /* Since avail_out is 0, deflate will be called again with
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	790 * more output space, but possibly with both pending and
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	791 * avail_in equal to zero. There won't be anything to do,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	792 * but this is not an error situation so make sure we
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	793 * return OK instead of BUF_ERROR at next call of deflate:
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	794 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	795 s->last_flush = -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	796 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	797 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	798
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	799 /* Make sure there is something to do and avoid duplicate consecutive
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	800 * flushes. For repeated and useless calls with Z_FINISH, we keep
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	801 * returning Z_STREAM_END instead of Z_BUF_ERROR.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	802 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	803 } else if (strm->avail_in == 0 && RANK(flush) <= RANK(old_flush) &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	804 flush != Z_FINISH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	805 ERR_RETURN(strm, Z_BUF_ERROR);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	806 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	807
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	808 /* User must not provide more input after the first FINISH: */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	809 if (s->status == FINISH_STATE && strm->avail_in != 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	810 ERR_RETURN(strm, Z_BUF_ERROR);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	811 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	812
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	813 /* Write the header */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	814 if (s->status == INIT_STATE) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	815 /* zlib header */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	816 uInt header = (Z_DEFLATED + ((s->w_bits-8)<<4)) << 8;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	817 uInt level_flags;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	818
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	819 if (s->strategy >= Z_HUFFMAN_ONLY \|\| s->level < 2)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	820 level_flags = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	821 else if (s->level < 6)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	822 level_flags = 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	823 else if (s->level == 6)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	824 level_flags = 2;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	825 else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	826 level_flags = 3;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	827 header \|= (level_flags << 6);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	828 if (s->strstart != 0) header \|= PRESET_DICT;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	829 header += 31 - (header % 31);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	830
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	831 putShortMSB(s, header);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	832
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	833 /* Save the adler32 of the preset dictionary: */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	834 if (s->strstart != 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	835 putShortMSB(s, (uInt)(strm->adler >> 16));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	836 putShortMSB(s, (uInt)(strm->adler & 0xffff));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	837 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	838 strm->adler = adler32(0L, Z_NULL, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	839 s->status = BUSY_STATE;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	840
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	841 /* Compression must start with an empty pending buffer */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	842 flush_pending(strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	843 if (s->pending != 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	844 s->last_flush = -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	845 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	846 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	847 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	848 #ifdef GZIP
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	849 if (s->status == GZIP_STATE) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	850 /* gzip header */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	851 strm->adler = crc32(0L, Z_NULL, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	852 put_byte(s, 31);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	853 put_byte(s, 139);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	854 put_byte(s, 8);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	855 if (s->gzhead == Z_NULL) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	856 put_byte(s, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	857 put_byte(s, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	858 put_byte(s, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	859 put_byte(s, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	860 put_byte(s, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	861 put_byte(s, s->level == 9 ? 2 :
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	862 (s->strategy >= Z_HUFFMAN_ONLY \|\| s->level < 2 ?
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	863 4 : 0));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	864 put_byte(s, OS_CODE);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	865 s->status = BUSY_STATE;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	866
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	867 /* Compression must start with an empty pending buffer */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	868 flush_pending(strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	869 if (s->pending != 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	870 s->last_flush = -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	871 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	872 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	873 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	874 else {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	875 put_byte(s, (s->gzhead->text ? 1 : 0) +
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	876 (s->gzhead->hcrc ? 2 : 0) +
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	877 (s->gzhead->extra == Z_NULL ? 0 : 4) +
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	878 (s->gzhead->name == Z_NULL ? 0 : 8) +
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	879 (s->gzhead->comment == Z_NULL ? 0 : 16)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	880 );
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	881 put_byte(s, (Byte)(s->gzhead->time & 0xff));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	882 put_byte(s, (Byte)((s->gzhead->time >> 8) & 0xff));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	883 put_byte(s, (Byte)((s->gzhead->time >> 16) & 0xff));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	884 put_byte(s, (Byte)((s->gzhead->time >> 24) & 0xff));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	885 put_byte(s, s->level == 9 ? 2 :
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	886 (s->strategy >= Z_HUFFMAN_ONLY \|\| s->level < 2 ?
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	887 4 : 0));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	888 put_byte(s, s->gzhead->os & 0xff);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	889 if (s->gzhead->extra != Z_NULL) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	890 put_byte(s, s->gzhead->extra_len & 0xff);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	891 put_byte(s, (s->gzhead->extra_len >> 8) & 0xff);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	892 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	893 if (s->gzhead->hcrc)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	894 strm->adler = crc32(strm->adler, s->pending_buf,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	895 s->pending);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	896 s->gzindex = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	897 s->status = EXTRA_STATE;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	898 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	899 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	900 if (s->status == EXTRA_STATE) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	901 if (s->gzhead->extra != Z_NULL) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	902 ulg beg = s->pending; /* start of bytes to update crc */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	903 uInt left = (s->gzhead->extra_len & 0xffff) - s->gzindex;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	904 while (s->pending + left > s->pending_buf_size) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	905 uInt copy = s->pending_buf_size - s->pending;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	906 zmemcpy(s->pending_buf + s->pending,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	907 s->gzhead->extra + s->gzindex, copy);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	908 s->pending = s->pending_buf_size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	909 HCRC_UPDATE(beg);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	910 s->gzindex += copy;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	911 flush_pending(strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	912 if (s->pending != 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	913 s->last_flush = -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	914 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	915 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	916 beg = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	917 left -= copy;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	918 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	919 zmemcpy(s->pending_buf + s->pending,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	920 s->gzhead->extra + s->gzindex, left);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	921 s->pending += left;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	922 HCRC_UPDATE(beg);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	923 s->gzindex = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	924 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	925 s->status = NAME_STATE;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	926 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	927 if (s->status == NAME_STATE) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	928 if (s->gzhead->name != Z_NULL) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	929 ulg beg = s->pending; /* start of bytes to update crc */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	930 int val;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	931 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	932 if (s->pending == s->pending_buf_size) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	933 HCRC_UPDATE(beg);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	934 flush_pending(strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	935 if (s->pending != 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	936 s->last_flush = -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	937 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	938 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	939 beg = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	940 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	941 val = s->gzhead->name[s->gzindex++];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	942 put_byte(s, val);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	943 } while (val != 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	944 HCRC_UPDATE(beg);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	945 s->gzindex = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	946 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	947 s->status = COMMENT_STATE;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	948 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	949 if (s->status == COMMENT_STATE) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	950 if (s->gzhead->comment != Z_NULL) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	951 ulg beg = s->pending; /* start of bytes to update crc */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	952 int val;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	953 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	954 if (s->pending == s->pending_buf_size) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	955 HCRC_UPDATE(beg);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	956 flush_pending(strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	957 if (s->pending != 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	958 s->last_flush = -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	959 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	960 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	961 beg = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	962 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	963 val = s->gzhead->comment[s->gzindex++];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	964 put_byte(s, val);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	965 } while (val != 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	966 HCRC_UPDATE(beg);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	967 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	968 s->status = HCRC_STATE;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	969 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	970 if (s->status == HCRC_STATE) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	971 if (s->gzhead->hcrc) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	972 if (s->pending + 2 > s->pending_buf_size) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	973 flush_pending(strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	974 if (s->pending != 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	975 s->last_flush = -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	976 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	977 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	978 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	979 put_byte(s, (Byte)(strm->adler & 0xff));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	980 put_byte(s, (Byte)((strm->adler >> 8) & 0xff));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	981 strm->adler = crc32(0L, Z_NULL, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	982 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	983 s->status = BUSY_STATE;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	984
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	985 /* Compression must start with an empty pending buffer */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	986 flush_pending(strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	987 if (s->pending != 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	988 s->last_flush = -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	989 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	990 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	991 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	992 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	993
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	994 /* Start a new block or continue the current one.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	995 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	996 if (strm->avail_in != 0 \|\| s->lookahead != 0 \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	997 (flush != Z_NO_FLUSH && s->status != FINISH_STATE)) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	998 block_state bstate;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	999
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1000 bstate = s->level == 0 ? deflate_stored(s, flush) :
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1001 s->strategy == Z_HUFFMAN_ONLY ? deflate_huff(s, flush) :
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1002 s->strategy == Z_RLE ? deflate_rle(s, flush) :
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1003 (*(configuration_table[s->level].func))(s, flush);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1004
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1005 if (bstate == finish_started \|\| bstate == finish_done) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1006 s->status = FINISH_STATE;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1007 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1008 if (bstate == need_more \|\| bstate == finish_started) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1009 if (strm->avail_out == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1010 s->last_flush = -1; /* avoid BUF_ERROR next call, see above */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1011 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1012 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1013 /* If flush != Z_NO_FLUSH && avail_out == 0, the next call
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1014 * of deflate should use the same flush parameter to make sure
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1015 * that the flush is complete. So we don't have to output an
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1016 * empty block here, this will be done at next call. This also
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1017 * ensures that for a very small output buffer, we emit at most
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1018 * one empty block.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1019 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1020 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1021 if (bstate == block_done) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1022 if (flush == Z_PARTIAL_FLUSH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1023 _tr_align(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1024 } else if (flush != Z_BLOCK) { /* FULL_FLUSH or SYNC_FLUSH */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1025 _tr_stored_block(s, (char*)0, 0L, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1026 /* For a full flush, this empty block will be recognized
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1027 * as a special marker by inflate_sync().
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1028 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1029 if (flush == Z_FULL_FLUSH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1030 CLEAR_HASH(s); /* forget history */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1031 if (s->lookahead == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1032 s->strstart = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1033 s->block_start = 0L;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1034 s->insert = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1035 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1036 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1037 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1038 flush_pending(strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1039 if (strm->avail_out == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1040 s->last_flush = -1; /* avoid BUF_ERROR at next call, see above */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1041 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1042 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1043 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1044 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1045
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1046 if (flush != Z_FINISH) return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1047 if (s->wrap <= 0) return Z_STREAM_END;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1048
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1049 /* Write the trailer */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1050 #ifdef GZIP
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1051 if (s->wrap == 2) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1052 put_byte(s, (Byte)(strm->adler & 0xff));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1053 put_byte(s, (Byte)((strm->adler >> 8) & 0xff));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1054 put_byte(s, (Byte)((strm->adler >> 16) & 0xff));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1055 put_byte(s, (Byte)((strm->adler >> 24) & 0xff));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1056 put_byte(s, (Byte)(strm->total_in & 0xff));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1057 put_byte(s, (Byte)((strm->total_in >> 8) & 0xff));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1058 put_byte(s, (Byte)((strm->total_in >> 16) & 0xff));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1059 put_byte(s, (Byte)((strm->total_in >> 24) & 0xff));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1060 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1061 else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1062 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1063 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1064 putShortMSB(s, (uInt)(strm->adler >> 16));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1065 putShortMSB(s, (uInt)(strm->adler & 0xffff));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1066 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1067 flush_pending(strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1068 /* If avail_out is zero, the application will call deflate again
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1069 * to flush the rest.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1070 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1071 if (s->wrap > 0) s->wrap = -s->wrap; /* write the trailer only once! */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1072 return s->pending != 0 ? Z_OK : Z_STREAM_END;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1073 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1074
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1075 /* ========================================================================= */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1076 int ZEXPORT deflateEnd (strm)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1077 z_streamp strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1078 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1079 int status;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1080
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1081 if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1082
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1083 status = strm->state->status;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1084
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1085 /* Deallocate in reverse order of allocations: */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1086 TRY_FREE(strm, strm->state->pending_buf);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1087 TRY_FREE(strm, strm->state->head);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1088 TRY_FREE(strm, strm->state->prev);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1089 TRY_FREE(strm, strm->state->window);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1090
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1091 ZFREE(strm, strm->state);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1092 strm->state = Z_NULL;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1093
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1094 return status == BUSY_STATE ? Z_DATA_ERROR : Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1095 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1096
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1097 /* =========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1098 * Copy the source state to the destination state.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1099 * To simplify the source, this is not supported for 16-bit MSDOS (which
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1100 * doesn't have enough memory anyway to duplicate compression states).
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1101 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1102 int ZEXPORT deflateCopy (dest, source)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1103 z_streamp dest;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1104 z_streamp source;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1105 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1106 #ifdef MAXSEG_64K
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1107 return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1108 #else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1109 deflate_state *ds;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1110 deflate_state *ss;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1111 ushf *overlay;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1112
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1113
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1114 if (deflateStateCheck(source) \|\| dest == Z_NULL) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1115 return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1116 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1117
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1118 ss = source->state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1119
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1120 zmemcpy((voidpf)dest, (voidpf)source, sizeof(z_stream));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1121
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1122 ds = (deflate_state *) ZALLOC(dest, 1, sizeof(deflate_state));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1123 if (ds == Z_NULL) return Z_MEM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1124 dest->state = (struct internal_state FAR *) ds;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1125 zmemcpy((voidpf)ds, (voidpf)ss, sizeof(deflate_state));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1126 ds->strm = dest;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1127
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1128 ds->window = (Bytef ) ZALLOC(dest, ds->w_size, 2sizeof(Byte));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1129 ds->prev = (Posf *) ZALLOC(dest, ds->w_size, sizeof(Pos));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1130 ds->head = (Posf *) ZALLOC(dest, ds->hash_size, sizeof(Pos));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1131 overlay = (ushf *) ZALLOC(dest, ds->lit_bufsize, sizeof(ush)+2);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1132 ds->pending_buf = (uchf *) overlay;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1133
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1134 if (ds->window == Z_NULL \|\| ds->prev == Z_NULL \|\| ds->head == Z_NULL \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1135 ds->pending_buf == Z_NULL) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1136 deflateEnd (dest);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1137 return Z_MEM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1138 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1139 /* following zmemcpy do not work for 16-bit MSDOS */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1140 zmemcpy(ds->window, ss->window, ds->w_size * 2 * sizeof(Byte));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1141 zmemcpy((voidpf)ds->prev, (voidpf)ss->prev, ds->w_size * sizeof(Pos));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1142 zmemcpy((voidpf)ds->head, (voidpf)ss->head, ds->hash_size * sizeof(Pos));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1143 zmemcpy(ds->pending_buf, ss->pending_buf, (uInt)ds->pending_buf_size);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1144
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1145 ds->pending_out = ds->pending_buf + (ss->pending_out - ss->pending_buf);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1146 ds->d_buf = overlay + ds->lit_bufsize/sizeof(ush);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1147 ds->l_buf = ds->pending_buf + (1+sizeof(ush))*ds->lit_bufsize;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1148
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1149 ds->l_desc.dyn_tree = ds->dyn_ltree;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1150 ds->d_desc.dyn_tree = ds->dyn_dtree;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1151 ds->bl_desc.dyn_tree = ds->bl_tree;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1152
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1153 return Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1154 #endif /* MAXSEG_64K */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1155 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1156
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1157 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1158 * Read a new buffer from the current input stream, update the adler32
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1159 * and total number of bytes read. All deflate() input goes through
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1160 * this function so some applications may wish to modify it to avoid
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1161 * allocating a large strm->next_in buffer and copying from it.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1162 * (See also flush_pending()).
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1163 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1164 local unsigned read_buf(strm, buf, size)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1165 z_streamp strm;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1166 Bytef *buf;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1167 unsigned size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1168 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1169 unsigned len = strm->avail_in;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1170
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1171 if (len > size) len = size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1172 if (len == 0) return 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1173
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1174 strm->avail_in -= len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1175
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1176 zmemcpy(buf, strm->next_in, len);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1177 if (strm->state->wrap == 1) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1178 strm->adler = adler32(strm->adler, buf, len);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1179 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1180 #ifdef GZIP
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1181 else if (strm->state->wrap == 2) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1182 strm->adler = crc32(strm->adler, buf, len);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1183 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1184 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1185 strm->next_in += len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1186 strm->total_in += len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1187
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1188 return len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1189 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1190
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1191 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1192 * Initialize the "longest match" routines for a new zlib stream
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1193 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1194 local void lm_init (s)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1195 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1196 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1197 s->window_size = (ulg)2L*s->w_size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1198
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1199 CLEAR_HASH(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1200
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1201 /* Set the default configuration parameters:
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1202 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1203 s->max_lazy_match = configuration_table[s->level].max_lazy;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1204 s->good_match = configuration_table[s->level].good_length;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1205 s->nice_match = configuration_table[s->level].nice_length;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1206 s->max_chain_length = configuration_table[s->level].max_chain;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1207
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1208 s->strstart = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1209 s->block_start = 0L;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1210 s->lookahead = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1211 s->insert = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1212 s->match_length = s->prev_length = MIN_MATCH-1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1213 s->match_available = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1214 s->ins_h = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1215 #ifndef FASTEST
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1216 #ifdef ASMV
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1217 match_init(); /* initialize the asm code */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1218 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1219 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1220 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1221
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1222 #ifndef FASTEST
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1223 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1224 * Set match_start to the longest match starting at the given string and
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1225 * return its length. Matches shorter or equal to prev_length are discarded,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1226 * in which case the result is equal to prev_length and match_start is
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1227 * garbage.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1228 * IN assertions: cur_match is the head of the hash chain for the current
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1229 * string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1230 * OUT assertion: the match length is not greater than s->lookahead.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1231 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1232 #ifndef ASMV
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1233 /* For 80x86 and 680x0, an optimized version will be provided in match.asm or
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1234 * match.S. The code will be functionally equivalent.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1235 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1236 local uInt longest_match(s, cur_match)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1237 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1238 IPos cur_match; /* current match */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1239 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1240 unsigned chain_length = s->max_chain_length;/* max hash chain length */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1241 register Bytef scan = s->window + s->strstart; / current string */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1242 register Bytef match; / matched string */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1243 register int len; /* length of current match */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1244 int best_len = (int)s->prev_length; /* best match length so far */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1245 int nice_match = s->nice_match; /* stop if match long enough */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1246 IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1247 s->strstart - (IPos)MAX_DIST(s) : NIL;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1248 /* Stop when cur_match becomes <= limit. To simplify the code,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1249 * we prevent matches with the string of window index 0.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1250 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1251 Posf *prev = s->prev;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1252 uInt wmask = s->w_mask;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1253
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1254 #ifdef UNALIGNED_OK
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1255 /* Compare two bytes at a time. Note: this is not always beneficial.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1256 * Try with and without -DUNALIGNED_OK to check.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1257 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1258 register Bytef *strend = s->window + s->strstart + MAX_MATCH - 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1259 register ush scan_start = (ushf)scan;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1260 register ush scan_end = (ushf)(scan+best_len-1);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1261 #else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1262 register Bytef *strend = s->window + s->strstart + MAX_MATCH;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1263 register Byte scan_end1 = scan[best_len-1];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1264 register Byte scan_end = scan[best_len];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1265 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1266
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1267 /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1268 * It is easy to get rid of this optimization if necessary.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1269 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1270 Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1271
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1272 /* Do not waste too much time if we already have a good match: */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1273 if (s->prev_length >= s->good_match) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1274 chain_length >>= 2;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1275 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1276 /* Do not look for matches beyond the end of the input. This is necessary
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1277 * to make deflate deterministic.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1278 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1279 if ((uInt)nice_match > s->lookahead) nice_match = (int)s->lookahead;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1280
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1281 Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1282
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1283 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1284 Assert(cur_match < s->strstart, "no future");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1285 match = s->window + cur_match;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1286
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1287 /* Skip to next match if the match length cannot increase
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1288 * or if the match length is less than 2. Note that the checks below
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1289 * for insufficient lookahead only occur occasionally for performance
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1290 * reasons. Therefore uninitialized memory will be accessed, and
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1291 * conditional jumps will be made that depend on those values.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1292 * However the length of the match is limited to the lookahead, so
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1293 * the output of deflate is not affected by the uninitialized values.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1294 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1295 #if (defined(UNALIGNED_OK) && MAX_MATCH == 258)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1296 /* This code assumes sizeof(unsigned short) == 2. Do not use
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1297 * UNALIGNED_OK if your compiler uses a different size.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1298 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1299 if ((ushf)(match+best_len-1) != scan_end \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1300 (ushf)match != scan_start) continue;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1301
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1302 /* It is not necessary to compare scan[2] and match[2] since they are
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1303 * always equal when the other bytes match, given that the hash keys
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1304 * are equal and that HASH_BITS >= 8. Compare 2 bytes at a time at
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1305 * strstart+3, +5, ... up to strstart+257. We check for insufficient
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1306 * lookahead only every 4th comparison; the 128th check will be made
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1307 * at strstart+257. If MAX_MATCH-2 is not a multiple of 8, it is
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1308 * necessary to put more guard bytes at the end of the window, or
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1309 * to check more often for insufficient lookahead.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1310 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1311 Assert(scan[2] == match[2], "scan[2]?");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1312 scan++, match++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1313 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1314 } while ((ushf)(scan+=2) == (ushf)(match+=2) &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1315 (ushf)(scan+=2) == (ushf)(match+=2) &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1316 (ushf)(scan+=2) == (ushf)(match+=2) &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1317 (ushf)(scan+=2) == (ushf)(match+=2) &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1318 scan < strend);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1319 /* The funny "do {}" generates better code on most compilers */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1320
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1321 /* Here, scan <= window+strstart+257 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1322 Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1323 if (scan == match) scan++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1324
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1325 len = (MAX_MATCH - 1) - (int)(strend-scan);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1326 scan = strend - (MAX_MATCH-1);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1327
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1328 #else /* UNALIGNED_OK */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1329
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1330 if (match[best_len] != scan_end \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1331 match[best_len-1] != scan_end1 \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1332 match != scan \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1333 *++match != scan[1]) continue;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1334
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1335 /* The check at best_len-1 can be removed because it will be made
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1336 * again later. (This heuristic is not always a win.)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1337 * It is not necessary to compare scan[2] and match[2] since they
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1338 * are always equal when the other bytes match, given that
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1339 * the hash keys are equal and that HASH_BITS >= 8.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1340 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1341 scan += 2, match++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1342 Assert(scan == match, "match[2]?");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1343
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1344 /* We check for insufficient lookahead only every 8th comparison;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1345 * the 256th check will be made at strstart+258.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1346 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1347 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1348 } while (++scan == ++match && ++scan == ++match &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1349 ++scan == ++match && ++scan == ++match &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1350 ++scan == ++match && ++scan == ++match &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1351 ++scan == ++match && ++scan == ++match &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1352 scan < strend);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1353
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1354 Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1355
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1356 len = MAX_MATCH - (int)(strend - scan);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1357 scan = strend - MAX_MATCH;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1358
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1359 #endif /* UNALIGNED_OK */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1360
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1361 if (len > best_len) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1362 s->match_start = cur_match;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1363 best_len = len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1364 if (len >= nice_match) break;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1365 #ifdef UNALIGNED_OK
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1366 scan_end = (ushf)(scan+best_len-1);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1367 #else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1368 scan_end1 = scan[best_len-1];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1369 scan_end = scan[best_len];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1370 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1371 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1372 } while ((cur_match = prev[cur_match & wmask]) > limit
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1373 && --chain_length != 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1374
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1375 if ((uInt)best_len <= s->lookahead) return (uInt)best_len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1376 return s->lookahead;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1377 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1378 #endif /* ASMV */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1379
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1380 #else /* FASTEST */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1381
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1382 /* ---------------------------------------------------------------------------
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1383 * Optimized version for FASTEST only
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1384 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1385 local uInt longest_match(s, cur_match)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1386 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1387 IPos cur_match; /* current match */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1388 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1389 register Bytef scan = s->window + s->strstart; / current string */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1390 register Bytef match; / matched string */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1391 register int len; /* length of current match */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1392 register Bytef *strend = s->window + s->strstart + MAX_MATCH;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1393
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1394 /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1395 * It is easy to get rid of this optimization if necessary.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1396 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1397 Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1398
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1399 Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1400
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1401 Assert(cur_match < s->strstart, "no future");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1402
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1403 match = s->window + cur_match;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1404
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1405 /* Return failure if the match length is less than 2:
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1406 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1407 if (match[0] != scan[0] \|\| match[1] != scan[1]) return MIN_MATCH-1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1408
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1409 /* The check at best_len-1 can be removed because it will be made
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1410 * again later. (This heuristic is not always a win.)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1411 * It is not necessary to compare scan[2] and match[2] since they
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1412 * are always equal when the other bytes match, given that
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1413 * the hash keys are equal and that HASH_BITS >= 8.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1414 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1415 scan += 2, match += 2;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1416 Assert(scan == match, "match[2]?");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1417
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1418 /* We check for insufficient lookahead only every 8th comparison;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1419 * the 256th check will be made at strstart+258.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1420 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1421 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1422 } while (++scan == ++match && ++scan == ++match &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1423 ++scan == ++match && ++scan == ++match &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1424 ++scan == ++match && ++scan == ++match &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1425 ++scan == ++match && ++scan == ++match &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1426 scan < strend);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1427
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1428 Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1429
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1430 len = MAX_MATCH - (int)(strend - scan);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1431
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1432 if (len < MIN_MATCH) return MIN_MATCH - 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1433
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1434 s->match_start = cur_match;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1435 return (uInt)len <= s->lookahead ? (uInt)len : s->lookahead;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1436 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1437
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1438 #endif /* FASTEST */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1439
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1440 #ifdef ZLIB_DEBUG
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1441
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1442 #define EQUAL 0
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1443 /* result of memcmp for equal strings */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1444
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1445 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1446 * Check that the match at match_start is indeed a match.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1447 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1448 local void check_match(s, start, match, length)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1449 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1450 IPos start, match;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1451 int length;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1452 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1453 /* check that the match is indeed a match */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1454 if (zmemcmp(s->window + match,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1455 s->window + start, length) != EQUAL) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1456 fprintf(stderr, " start %u, match %u, length %d\n",
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1457 start, match, length);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1458 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1459 fprintf(stderr, "%c%c", s->window[match++], s->window[start++]);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1460 } while (--length != 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1461 z_error("invalid match");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1462 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1463 if (z_verbose > 1) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1464 fprintf(stderr,"\\[%d,%d]", start-match, length);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1465 do { putc(s->window[start++], stderr); } while (--length != 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1466 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1467 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1468 #else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1469 # define check_match(s, start, match, length)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1470 #endif /* ZLIB_DEBUG */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1471
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1472 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1473 * Fill the window when the lookahead becomes insufficient.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1474 * Updates strstart and lookahead.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1475 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1476 * IN assertion: lookahead < MIN_LOOKAHEAD
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1477 * OUT assertions: strstart <= window_size-MIN_LOOKAHEAD
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1478 * At least one byte has been read, or avail_in == 0; reads are
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1479 * performed for at least two bytes (required for the zip translate_eol
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1480 * option -- not supported here).
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1481 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1482 local void fill_window(s)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1483 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1484 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1485 unsigned n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1486 unsigned more; /* Amount of free space at the end of the window. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1487 uInt wsize = s->w_size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1488
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1489 Assert(s->lookahead < MIN_LOOKAHEAD, "already enough lookahead");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1490
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1491 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1492 more = (unsigned)(s->window_size -(ulg)s->lookahead -(ulg)s->strstart);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1493
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1494 /* Deal with !@#$% 64K limit: */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1495 if (sizeof(int) <= 2) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1496 if (more == 0 && s->strstart == 0 && s->lookahead == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1497 more = wsize;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1498
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1499 } else if (more == (unsigned)(-1)) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1500 /* Very unlikely, but possible on 16 bit machine if
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1501 * strstart == 0 && lookahead == 1 (input done a byte at time)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1502 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1503 more--;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1504 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1505 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1506
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1507 /* If the window is almost full and there is insufficient lookahead,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1508 * move the upper half to the lower one to make room in the upper half.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1509 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1510 if (s->strstart >= wsize+MAX_DIST(s)) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1511
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1512 zmemcpy(s->window, s->window+wsize, (unsigned)wsize - more);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1513 s->match_start -= wsize;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1514 s->strstart -= wsize; /* we now have strstart >= MAX_DIST */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1515 s->block_start -= (long) wsize;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1516 slide_hash(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1517 more += wsize;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1518 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1519 if (s->strm->avail_in == 0) break;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1520
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1521 /* If there was no sliding:
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1522 * strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1523 * more == window_size - lookahead - strstart
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1524 * => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1525 * => more >= window_size - 2*WSIZE + 2
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1526 * In the BIG_MEM or MMAP case (not yet supported),
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1527 * window_size == input_size + MIN_LOOKAHEAD &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1528 * strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1529 * Otherwise, window_size == 2*WSIZE so more >= 2.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1530 * If there was sliding, more >= WSIZE. So in all cases, more >= 2.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1531 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1532 Assert(more >= 2, "more < 2");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1533
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1534 n = read_buf(s->strm, s->window + s->strstart + s->lookahead, more);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1535 s->lookahead += n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1536
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1537 /* Initialize the hash value now that we have some input: */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1538 if (s->lookahead + s->insert >= MIN_MATCH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1539 uInt str = s->strstart - s->insert;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1540 s->ins_h = s->window[str];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1541 UPDATE_HASH(s, s->ins_h, s->window[str + 1]);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1542 #if MIN_MATCH != 3
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1543 Call UPDATE_HASH() MIN_MATCH-3 more times
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1544 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1545 while (s->insert) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1546 UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1547 #ifndef FASTEST
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1548 s->prev[str & s->w_mask] = s->head[s->ins_h];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1549 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1550 s->head[s->ins_h] = (Pos)str;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1551 str++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1552 s->insert--;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1553 if (s->lookahead + s->insert < MIN_MATCH)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1554 break;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1555 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1556 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1557 /* If the whole input has less than MIN_MATCH bytes, ins_h is garbage,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1558 * but this is not important since only literal bytes will be emitted.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1559 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1560
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1561 } while (s->lookahead < MIN_LOOKAHEAD && s->strm->avail_in != 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1562
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1563 /* If the WIN_INIT bytes after the end of the current data have never been
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1564 * written, then zero those bytes in order to avoid memory check reports of
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1565 * the use of uninitialized (or uninitialised as Julian writes) bytes by
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1566 * the longest match routines. Update the high water mark for the next
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1567 * time through here. WIN_INIT is set to MAX_MATCH since the longest match
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1568 * routines allow scanning to strstart + MAX_MATCH, ignoring lookahead.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1569 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1570 if (s->high_water < s->window_size) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1571 ulg curr = s->strstart + (ulg)(s->lookahead);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1572 ulg init;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1573
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1574 if (s->high_water < curr) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1575 /* Previous high water mark below current data -- zero WIN_INIT
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1576 * bytes or up to end of window, whichever is less.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1577 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1578 init = s->window_size - curr;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1579 if (init > WIN_INIT)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1580 init = WIN_INIT;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1581 zmemzero(s->window + curr, (unsigned)init);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1582 s->high_water = curr + init;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1583 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1584 else if (s->high_water < (ulg)curr + WIN_INIT) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1585 /* High water mark at or above current data, but below current data
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1586 * plus WIN_INIT -- zero out to current data plus WIN_INIT, or up
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1587 * to end of window, whichever is less.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1588 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1589 init = (ulg)curr + WIN_INIT - s->high_water;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1590 if (init > s->window_size - s->high_water)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1591 init = s->window_size - s->high_water;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1592 zmemzero(s->window + s->high_water, (unsigned)init);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1593 s->high_water += init;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1594 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1595 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1596
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1597 Assert((ulg)s->strstart <= s->window_size - MIN_LOOKAHEAD,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1598 "not enough room for search");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1599 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1600
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1601 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1602 * Flush the current block, with given end-of-file flag.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1603 * IN assertion: strstart is set to the end of the current match.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1604 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1605 #define FLUSH_BLOCK_ONLY(s, last) { \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1606 _tr_flush_block(s, (s->block_start >= 0L ? \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1607 (charf *)&s->window[(unsigned)s->block_start] : \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1608 (charf *)Z_NULL), \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1609 (ulg)((long)s->strstart - s->block_start), \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1610 (last)); \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1611 s->block_start = s->strstart; \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1612 flush_pending(s->strm); \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1613 Tracev((stderr,"[FLUSH]")); \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1614 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1615
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1616 /* Same but force premature exit if necessary. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1617 #define FLUSH_BLOCK(s, last) { \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1618 FLUSH_BLOCK_ONLY(s, last); \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1619 if (s->strm->avail_out == 0) return (last) ? finish_started : need_more; \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1620 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1621
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1622 /* Maximum stored block length in deflate format (not including header). */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1623 #define MAX_STORED 65535
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1624
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1625 /* Minimum of a and b. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1626 #define MIN(a, b) ((a) > (b) ? (b) : (a))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1627
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1628 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1629 * Copy without compression as much as possible from the input stream, return
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1630 * the current block state.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1631 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1632 * In case deflateParams() is used to later switch to a non-zero compression
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1633 * level, s->matches (otherwise unused when storing) keeps track of the number
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1634 * of hash table slides to perform. If s->matches is 1, then one hash table
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1635 * slide will be done when switching. If s->matches is 2, the maximum value
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1636 * allowed here, then the hash table will be cleared, since two or more slides
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1637 * is the same as a clear.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1638 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1639 * deflate_stored() is written to minimize the number of times an input byte is
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1640 * copied. It is most efficient with large input and output buffers, which
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1641 * maximizes the opportunites to have a single copy from next_in to next_out.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1642 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1643 local block_state deflate_stored(s, flush)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1644 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1645 int flush;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1646 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1647 /* Smallest worthy block size when not flushing or finishing. By default
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1648 * this is 32K. This can be as small as 507 bytes for memLevel == 1. For
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1649 * large input and output buffers, the stored block size will be larger.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1650 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1651 unsigned min_block = MIN(s->pending_buf_size - 5, s->w_size);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1652
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1653 /* Copy as many min_block or larger stored blocks directly to next_out as
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1654 * possible. If flushing, copy the remaining available input to next_out as
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1655 * stored blocks, if there is enough space.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1656 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1657 unsigned len, left, have, last = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1658 unsigned used = s->strm->avail_in;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1659 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1660 /* Set len to the maximum size block that we can copy directly with the
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1661 * available input data and output space. Set left to how much of that
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1662 * would be copied from what's left in the window.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1663 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1664 len = MAX_STORED; /* maximum deflate stored block length */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1665 have = (s->bi_valid + 42) >> 3; /* number of header bytes */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1666 if (s->strm->avail_out < have) /* need room for header */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1667 break;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1668 /* maximum stored block length that will fit in avail_out: */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1669 have = s->strm->avail_out - have;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1670 left = s->strstart - s->block_start; /* bytes left in window */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1671 if (len > (ulg)left + s->strm->avail_in)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1672 len = left + s->strm->avail_in; /* limit len to the input */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1673 if (len > have)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1674 len = have; /* limit len to the output */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1675
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1676 /* If the stored block would be less than min_block in length, or if
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1677 * unable to copy all of the available input when flushing, then try
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1678 * copying to the window and the pending buffer instead. Also don't
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1679 * write an empty block when flushing -- deflate() does that.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1680 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1681 if (len < min_block && ((len == 0 && flush != Z_FINISH) \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1682 flush == Z_NO_FLUSH \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1683 len != left + s->strm->avail_in))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1684 break;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1685
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1686 /* Make a dummy stored block in pending to get the header bytes,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1687 * including any pending bits. This also updates the debugging counts.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1688 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1689 last = flush == Z_FINISH && len == left + s->strm->avail_in ? 1 : 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1690 _tr_stored_block(s, (char *)0, 0L, last);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1691
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1692 /* Replace the lengths in the dummy stored block with len. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1693 s->pending_buf[s->pending - 4] = len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1694 s->pending_buf[s->pending - 3] = len >> 8;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1695 s->pending_buf[s->pending - 2] = ~len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1696 s->pending_buf[s->pending - 1] = ~len >> 8;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1697
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1698 /* Write the stored block header bytes. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1699 flush_pending(s->strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1700
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1701 #ifdef ZLIB_DEBUG
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1702 /* Update debugging counts for the data about to be copied. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1703 s->compressed_len += len << 3;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1704 s->bits_sent += len << 3;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1705 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1706
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1707 /* Copy uncompressed bytes from the window to next_out. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1708 if (left) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1709 if (left > len)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1710 left = len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1711 zmemcpy(s->strm->next_out, s->window + s->block_start, left);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1712 s->strm->next_out += left;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1713 s->strm->avail_out -= left;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1714 s->strm->total_out += left;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1715 s->block_start += left;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1716 len -= left;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1717 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1718
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1719 /* Copy uncompressed bytes directly from next_in to next_out, updating
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1720 * the check value.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1721 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1722 if (len) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1723 read_buf(s->strm, s->strm->next_out, len);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1724 s->strm->next_out += len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1725 s->strm->avail_out -= len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1726 s->strm->total_out += len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1727 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1728 } while (last == 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1729
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1730 /* Update the sliding window with the last s->w_size bytes of the copied
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1731 * data, or append all of the copied data to the existing window if less
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1732 * than s->w_size bytes were copied. Also update the number of bytes to
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1733 * insert in the hash tables, in the event that deflateParams() switches to
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1734 * a non-zero compression level.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1735 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1736 used -= s->strm->avail_in; /* number of input bytes directly copied */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1737 if (used) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1738 /* If any input was used, then no unused input remains in the window,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1739 * therefore s->block_start == s->strstart.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1740 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1741 if (used >= s->w_size) { /* supplant the previous history */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1742 s->matches = 2; /* clear hash */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1743 zmemcpy(s->window, s->strm->next_in - s->w_size, s->w_size);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1744 s->strstart = s->w_size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1745 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1746 else {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1747 if (s->window_size - s->strstart <= used) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1748 /* Slide the window down. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1749 s->strstart -= s->w_size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1750 zmemcpy(s->window, s->window + s->w_size, s->strstart);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1751 if (s->matches < 2)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1752 s->matches++; /* add a pending slide_hash() */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1753 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1754 zmemcpy(s->window + s->strstart, s->strm->next_in - used, used);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1755 s->strstart += used;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1756 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1757 s->block_start = s->strstart;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1758 s->insert += MIN(used, s->w_size - s->insert);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1759 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1760 if (s->high_water < s->strstart)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1761 s->high_water = s->strstart;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1762
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1763 /* If the last block was written to next_out, then done. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1764 if (last)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1765 return finish_done;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1766
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1767 /* If flushing and all input has been consumed, then done. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1768 if (flush != Z_NO_FLUSH && flush != Z_FINISH &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1769 s->strm->avail_in == 0 && (long)s->strstart == s->block_start)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1770 return block_done;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1771
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1772 /* Fill the window with any remaining input. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1773 have = s->window_size - s->strstart - 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1774 if (s->strm->avail_in > have && s->block_start >= (long)s->w_size) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1775 /* Slide the window down. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1776 s->block_start -= s->w_size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1777 s->strstart -= s->w_size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1778 zmemcpy(s->window, s->window + s->w_size, s->strstart);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1779 if (s->matches < 2)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1780 s->matches++; /* add a pending slide_hash() */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1781 have += s->w_size; /* more space now */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1782 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1783 if (have > s->strm->avail_in)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1784 have = s->strm->avail_in;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1785 if (have) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1786 read_buf(s->strm, s->window + s->strstart, have);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1787 s->strstart += have;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1788 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1789 if (s->high_water < s->strstart)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1790 s->high_water = s->strstart;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1791
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1792 /* There was not enough avail_out to write a complete worthy or flushed
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1793 * stored block to next_out. Write a stored block to pending instead, if we
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1794 * have enough input for a worthy block, or if flushing and there is enough
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1795 * room for the remaining input as a stored block in the pending buffer.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1796 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1797 have = (s->bi_valid + 42) >> 3; /* number of header bytes */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1798 /* maximum stored block length that will fit in pending: */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1799 have = MIN(s->pending_buf_size - have, MAX_STORED);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1800 min_block = MIN(have, s->w_size);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1801 left = s->strstart - s->block_start;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1802 if (left >= min_block \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1803 ((left \|\| flush == Z_FINISH) && flush != Z_NO_FLUSH &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1804 s->strm->avail_in == 0 && left <= have)) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1805 len = MIN(left, have);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1806 last = flush == Z_FINISH && s->strm->avail_in == 0 &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1807 len == left ? 1 : 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1808 _tr_stored_block(s, (charf *)s->window + s->block_start, len, last);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1809 s->block_start += len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1810 flush_pending(s->strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1811 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1812
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1813 /* We've done all we can with the available input and output. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1814 return last ? finish_started : need_more;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1815 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1816
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1817 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1818 * Compress as much as possible from the input stream, return the current
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1819 * block state.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1820 * This function does not perform lazy evaluation of matches and inserts
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1821 * new strings in the dictionary only for unmatched strings or for short
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1822 * matches. It is used only for the fast compression options.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1823 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1824 local block_state deflate_fast(s, flush)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1825 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1826 int flush;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1827 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1828 IPos hash_head; /* head of the hash chain */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1829 int bflush; /* set if current block must be flushed */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1830
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1831 for (;;) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1832 /* Make sure that we always have enough lookahead, except
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1833 * at the end of the input file. We need MAX_MATCH bytes
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1834 * for the next match, plus MIN_MATCH bytes to insert the
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1835 * string following the next match.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1836 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1837 if (s->lookahead < MIN_LOOKAHEAD) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1838 fill_window(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1839 if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1840 return need_more;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1841 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1842 if (s->lookahead == 0) break; /* flush the current block */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1843 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1844
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1845 /* Insert the string window[strstart .. strstart+2] in the
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1846 * dictionary, and set hash_head to the head of the hash chain:
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1847 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1848 hash_head = NIL;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1849 if (s->lookahead >= MIN_MATCH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1850 INSERT_STRING(s, s->strstart, hash_head);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1851 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1852
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1853 /* Find the longest match, discarding those <= prev_length.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1854 * At this point we have always match_length < MIN_MATCH
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1855 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1856 if (hash_head != NIL && s->strstart - hash_head <= MAX_DIST(s)) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1857 /* To simplify the code, we prevent matches with the string
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1858 * of window index 0 (in particular we have to avoid a match
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1859 * of the string with itself at the start of the input file).
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1860 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1861 s->match_length = longest_match (s, hash_head);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1862 /* longest_match() sets match_start */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1863 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1864 if (s->match_length >= MIN_MATCH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1865 check_match(s, s->strstart, s->match_start, s->match_length);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1866
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1867 _tr_tally_dist(s, s->strstart - s->match_start,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1868 s->match_length - MIN_MATCH, bflush);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1869
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1870 s->lookahead -= s->match_length;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1871
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1872 /* Insert new strings in the hash table only if the match length
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1873 * is not too large. This saves time but degrades compression.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1874 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1875 #ifndef FASTEST
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1876 if (s->match_length <= s->max_insert_length &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1877 s->lookahead >= MIN_MATCH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1878 s->match_length--; /* string at strstart already in table */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1879 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1880 s->strstart++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1881 INSERT_STRING(s, s->strstart, hash_head);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1882 /* strstart never exceeds WSIZE-MAX_MATCH, so there are
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1883 * always MIN_MATCH bytes ahead.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1884 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1885 } while (--s->match_length != 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1886 s->strstart++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1887 } else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1888 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1889 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1890 s->strstart += s->match_length;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1891 s->match_length = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1892 s->ins_h = s->window[s->strstart];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1893 UPDATE_HASH(s, s->ins_h, s->window[s->strstart+1]);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1894 #if MIN_MATCH != 3
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1895 Call UPDATE_HASH() MIN_MATCH-3 more times
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1896 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1897 /* If lookahead < MIN_MATCH, ins_h is garbage, but it does not
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1898 * matter since it will be recomputed at next deflate call.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1899 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1900 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1901 } else {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1902 /* No match, output a literal byte */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1903 Tracevv((stderr,"%c", s->window[s->strstart]));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1904 _tr_tally_lit (s, s->window[s->strstart], bflush);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1905 s->lookahead--;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1906 s->strstart++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1907 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1908 if (bflush) FLUSH_BLOCK(s, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1909 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1910 s->insert = s->strstart < MIN_MATCH-1 ? s->strstart : MIN_MATCH-1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1911 if (flush == Z_FINISH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1912 FLUSH_BLOCK(s, 1);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1913 return finish_done;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1914 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1915 if (s->last_lit)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1916 FLUSH_BLOCK(s, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1917 return block_done;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1918 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1919
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1920 #ifndef FASTEST
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1921 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1922 * Same as above, but achieves better compression. We use a lazy
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1923 * evaluation for matches: a match is finally adopted only if there is
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1924 * no better match at the next window position.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1925 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1926 local block_state deflate_slow(s, flush)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1927 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1928 int flush;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1929 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1930 IPos hash_head; /* head of hash chain */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1931 int bflush; /* set if current block must be flushed */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1932
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1933 /* Process the input block. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1934 for (;;) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1935 /* Make sure that we always have enough lookahead, except
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1936 * at the end of the input file. We need MAX_MATCH bytes
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1937 * for the next match, plus MIN_MATCH bytes to insert the
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1938 * string following the next match.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1939 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1940 if (s->lookahead < MIN_LOOKAHEAD) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1941 fill_window(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1942 if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1943 return need_more;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1944 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1945 if (s->lookahead == 0) break; /* flush the current block */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1946 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1947
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1948 /* Insert the string window[strstart .. strstart+2] in the
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1949 * dictionary, and set hash_head to the head of the hash chain:
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1950 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1951 hash_head = NIL;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1952 if (s->lookahead >= MIN_MATCH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1953 INSERT_STRING(s, s->strstart, hash_head);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1954 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1955
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1956 /* Find the longest match, discarding those <= prev_length.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1957 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1958 s->prev_length = s->match_length, s->prev_match = s->match_start;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1959 s->match_length = MIN_MATCH-1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1960
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1961 if (hash_head != NIL && s->prev_length < s->max_lazy_match &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1962 s->strstart - hash_head <= MAX_DIST(s)) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1963 /* To simplify the code, we prevent matches with the string
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1964 * of window index 0 (in particular we have to avoid a match
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1965 * of the string with itself at the start of the input file).
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1966 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1967 s->match_length = longest_match (s, hash_head);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1968 /* longest_match() sets match_start */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1969
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1970 if (s->match_length <= 5 && (s->strategy == Z_FILTERED
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1971 #if TOO_FAR <= 32767
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1972 \|\| (s->match_length == MIN_MATCH &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1973 s->strstart - s->match_start > TOO_FAR)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1974 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1975 )) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1976
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1977 /* If prev_match is also MIN_MATCH, match_start is garbage
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1978 * but we will ignore the current match anyway.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1979 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1980 s->match_length = MIN_MATCH-1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1981 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1982 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1983 /* If there was a match at the previous step and the current
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1984 * match is not better, output the previous match:
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1985 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1986 if (s->prev_length >= MIN_MATCH && s->match_length <= s->prev_length) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1987 uInt max_insert = s->strstart + s->lookahead - MIN_MATCH;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1988 /* Do not insert strings in hash table beyond this. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1989
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1990 check_match(s, s->strstart-1, s->prev_match, s->prev_length);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1991
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1992 _tr_tally_dist(s, s->strstart -1 - s->prev_match,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1993 s->prev_length - MIN_MATCH, bflush);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1994
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1995 /* Insert in hash table all strings up to the end of the match.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1996 * strstart-1 and strstart are already inserted. If there is not
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1997 * enough lookahead, the last two strings are not inserted in
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1998 * the hash table.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1999 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2000 s->lookahead -= s->prev_length-1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2001 s->prev_length -= 2;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2002 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2003 if (++s->strstart <= max_insert) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2004 INSERT_STRING(s, s->strstart, hash_head);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2005 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2006 } while (--s->prev_length != 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2007 s->match_available = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2008 s->match_length = MIN_MATCH-1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2009 s->strstart++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2010
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2011 if (bflush) FLUSH_BLOCK(s, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2012
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2013 } else if (s->match_available) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2014 /* If there was no match at the previous position, output a
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2015 * single literal. If there was a match but the current match
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2016 * is longer, truncate the previous match to a single literal.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2017 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2018 Tracevv((stderr,"%c", s->window[s->strstart-1]));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2019 _tr_tally_lit(s, s->window[s->strstart-1], bflush);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2020 if (bflush) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2021 FLUSH_BLOCK_ONLY(s, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2022 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2023 s->strstart++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2024 s->lookahead--;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2025 if (s->strm->avail_out == 0) return need_more;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2026 } else {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2027 /* There is no previous match to compare with, wait for
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2028 * the next step to decide.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2029 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2030 s->match_available = 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2031 s->strstart++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2032 s->lookahead--;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2033 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2034 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2035 Assert (flush != Z_NO_FLUSH, "no flush?");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2036 if (s->match_available) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2037 Tracevv((stderr,"%c", s->window[s->strstart-1]));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2038 _tr_tally_lit(s, s->window[s->strstart-1], bflush);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2039 s->match_available = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2040 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2041 s->insert = s->strstart < MIN_MATCH-1 ? s->strstart : MIN_MATCH-1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2042 if (flush == Z_FINISH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2043 FLUSH_BLOCK(s, 1);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2044 return finish_done;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2045 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2046 if (s->last_lit)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2047 FLUSH_BLOCK(s, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2048 return block_done;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2049 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2050 #endif /* FASTEST */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2051
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2052 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2053 * For Z_RLE, simply look for runs of bytes, generate matches only of distance
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2054 * one. Do not maintain a hash table. (It will be regenerated if this run of
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2055 * deflate switches away from Z_RLE.)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2056 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2057 local block_state deflate_rle(s, flush)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2058 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2059 int flush;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2060 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2061 int bflush; /* set if current block must be flushed */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2062 uInt prev; /* byte at distance one to match */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2063 Bytef scan, strend; /* scan goes up to strend for length of run */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2064
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2065 for (;;) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2066 /* Make sure that we always have enough lookahead, except
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2067 * at the end of the input file. We need MAX_MATCH bytes
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2068 * for the longest run, plus one for the unrolled loop.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2069 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2070 if (s->lookahead <= MAX_MATCH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2071 fill_window(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2072 if (s->lookahead <= MAX_MATCH && flush == Z_NO_FLUSH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2073 return need_more;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2074 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2075 if (s->lookahead == 0) break; /* flush the current block */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2076 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2077
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2078 /* See how many times the previous byte repeats */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2079 s->match_length = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2080 if (s->lookahead >= MIN_MATCH && s->strstart > 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2081 scan = s->window + s->strstart - 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2082 prev = *scan;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2083 if (prev == ++scan && prev == ++scan && prev == *++scan) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2084 strend = s->window + s->strstart + MAX_MATCH;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2085 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2086 } while (prev == ++scan && prev == ++scan &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2087 prev == ++scan && prev == ++scan &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2088 prev == ++scan && prev == ++scan &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2089 prev == ++scan && prev == ++scan &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2090 scan < strend);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2091 s->match_length = MAX_MATCH - (uInt)(strend - scan);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2092 if (s->match_length > s->lookahead)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2093 s->match_length = s->lookahead;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2094 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2095 Assert(scan <= s->window+(uInt)(s->window_size-1), "wild scan");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2096 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2097
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2098 /* Emit match if have run of MIN_MATCH or longer, else emit literal */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2099 if (s->match_length >= MIN_MATCH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2100 check_match(s, s->strstart, s->strstart - 1, s->match_length);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2101
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2102 _tr_tally_dist(s, 1, s->match_length - MIN_MATCH, bflush);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2103
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2104 s->lookahead -= s->match_length;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2105 s->strstart += s->match_length;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2106 s->match_length = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2107 } else {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2108 /* No match, output a literal byte */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2109 Tracevv((stderr,"%c", s->window[s->strstart]));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2110 _tr_tally_lit (s, s->window[s->strstart], bflush);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2111 s->lookahead--;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2112 s->strstart++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2113 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2114 if (bflush) FLUSH_BLOCK(s, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2115 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2116 s->insert = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2117 if (flush == Z_FINISH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2118 FLUSH_BLOCK(s, 1);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2119 return finish_done;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2120 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2121 if (s->last_lit)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2122 FLUSH_BLOCK(s, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2123 return block_done;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2124 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2125
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2126 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2127 * For Z_HUFFMAN_ONLY, do not look for matches. Do not maintain a hash table.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2128 * (It will be regenerated if this run of deflate switches away from Huffman.)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2129 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2130 local block_state deflate_huff(s, flush)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2131 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2132 int flush;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2133 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2134 int bflush; /* set if current block must be flushed */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2135
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2136 for (;;) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2137 /* Make sure that we have a literal to write. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2138 if (s->lookahead == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2139 fill_window(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2140 if (s->lookahead == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2141 if (flush == Z_NO_FLUSH)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2142 return need_more;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2143 break; /* flush the current block */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2144 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2145 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2146
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2147 /* Output a literal byte */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2148 s->match_length = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2149 Tracevv((stderr,"%c", s->window[s->strstart]));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2150 _tr_tally_lit (s, s->window[s->strstart], bflush);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2151 s->lookahead--;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2152 s->strstart++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2153 if (bflush) FLUSH_BLOCK(s, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2154 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2155 s->insert = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2156 if (flush == Z_FINISH) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2157 FLUSH_BLOCK(s, 1);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2158 return finish_done;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2159 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2160 if (s->last_lit)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2161 FLUSH_BLOCK(s, 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2162 return block_done;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2163 }

Mercurial > repos > blastem

annotate zlib/deflate.c @ 1557:a0fbb1e90533