repos/blastem: zlib/trees.c annotate

annotate zlib/trees.c @ 1746:cd6f4cea97b6

Call srand in Z80 test generator so different values are used when regenerating tests

author	Michael Pavone <pavone@retrodev.com>
date	Wed, 06 Feb 2019 08:54:56 -0800
parents	00d788dac91a
children

rev	line source
1530 00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1 /* trees.c -- output deflated data using Huffman coding
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2 * Copyright (C) 1995-2017 Jean-loup Gailly
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	3 * detect_data_type() function provided freely by Cosmin Truta, 2006
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	4 * 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	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 /*
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	8 * ALGORITHM
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	9 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	10 * The "deflation" process uses several Huffman trees. The more
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	11 * common source values are represented by shorter bit sequences.
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 * Each code tree is stored in a compressed form which is itself
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	14 * a Huffman encoding of the lengths of all the code strings (in
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	15 * ascending order by source values). The actual code strings are
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	16 * reconstructed from the lengths in the inflate process, as described
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	17 * in the deflate specification.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	18 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	19 * REFERENCES
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	20 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	21 * Deutsch, L.P.,"'Deflate' Compressed Data Format Specification".
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	22 * Available in ftp.uu.net:/pub/archiving/zip/doc/deflate-1.1.doc
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	23 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	24 * Storer, James A.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	25 * Data Compression: Methods and Theory, pp. 49-50.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	26 * Computer Science Press, 1988. ISBN 0-7167-8156-5.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	27 *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	28 * Sedgewick, R.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	29 * Algorithms, p290.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	30 * Addison-Wesley, 1983. ISBN 0-201-06672-6.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	31 */
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 /* @(#) $Id$ */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	34
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	35 /* #define GEN_TREES_H */
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 #include "deflate.h"
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 #ifdef ZLIB_DEBUG
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	40 # include <ctype.h>
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	41 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	42
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	43 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	44 * Constants
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	45 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	46
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	47 #define MAX_BL_BITS 7
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	48 /* Bit length codes must not exceed MAX_BL_BITS bits */
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 #define END_BLOCK 256
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	51 /* end of block literal code */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	52
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	53 #define REP_3_6 16
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	54 /* repeat previous bit length 3-6 times (2 bits of repeat count) */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	55
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	56 #define REPZ_3_10 17
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	57 /* repeat a zero length 3-10 times (3 bits of repeat count) */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	58
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	59 #define REPZ_11_138 18
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	60 /* repeat a zero length 11-138 times (7 bits of repeat count) */
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 local const int extra_lbits[LENGTH_CODES] /* extra bits for each length code */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	63 = {0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0};
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	64
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	65 local const int extra_dbits[D_CODES] /* extra bits for each distance code */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	66 = {0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	67
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	68 local const int extra_blbits[BL_CODES]/* extra bits for each bit length code */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	69 = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7};
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	70
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	71 local const uch bl_order[BL_CODES]
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	72 = {16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15};
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	73 /* The lengths of the bit length codes are sent in order of decreasing
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	74 * probability, to avoid transmitting the lengths for unused bit length codes.
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
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	77 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	78 * Local data. These are initialized only once.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	79 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	80
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	81 #define DIST_CODE_LEN 512 /* see definition of array dist_code below */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	82
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	83 #if defined(GEN_TREES_H) \|\| !defined(STDC)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	84 /* non ANSI compilers may not accept trees.h */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	85
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	86 local ct_data static_ltree[L_CODES+2];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	87 /* The static literal tree. Since the bit lengths are imposed, there is no
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	88 * need for the L_CODES extra codes used during heap construction. However
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	89 * The codes 286 and 287 are needed to build a canonical tree (see _tr_init
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	90 * below).
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	91 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	92
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	93 local ct_data static_dtree[D_CODES];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	94 /* The static distance tree. (Actually a trivial tree since all codes use
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	95 * 5 bits.)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	96 */
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 uch _dist_code[DIST_CODE_LEN];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	99 /* Distance codes. The first 256 values correspond to the distances
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	100 * 3 .. 258, the last 256 values correspond to the top 8 bits of
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	101 * the 15 bit distances.
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 uch _length_code[MAX_MATCH-MIN_MATCH+1];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	105 /* length code for each normalized match length (0 == MIN_MATCH) */
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 local int base_length[LENGTH_CODES];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	108 /* First normalized length for each code (0 = MIN_MATCH) */
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 local int base_dist[D_CODES];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	111 /* First normalized distance for each code (0 = distance of 1) */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	112
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	113 #else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	114 # include "trees.h"
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	115 #endif /* GEN_TREES_H */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	116
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	117 struct static_tree_desc_s {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	118 const ct_data static_tree; / static tree or NULL */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	119 const intf extra_bits; / extra bits for each code or NULL */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	120 int extra_base; /* base index for extra_bits */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	121 int elems; /* max number of elements in the tree */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	122 int max_length; /* max bit length for the codes */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	123 };
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	124
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	125 local const static_tree_desc static_l_desc =
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	126 {static_ltree, extra_lbits, LITERALS+1, L_CODES, MAX_BITS};
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 local const static_tree_desc static_d_desc =
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	129 {static_dtree, extra_dbits, 0, D_CODES, MAX_BITS};
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	130
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	131 local const static_tree_desc static_bl_desc =
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	132 {(const ct_data *)0, extra_blbits, 0, BL_CODES, MAX_BL_BITS};
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	133
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	134 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	135 * Local (static) routines in this file.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	136 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	137
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	138 local void tr_static_init OF((void));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	139 local void init_block OF((deflate_state *s));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	140 local void pqdownheap OF((deflate_state s, ct_data tree, int k));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	141 local void gen_bitlen OF((deflate_state s, tree_desc desc));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	142 local void gen_codes OF((ct_data tree, int max_code, ushf bl_count));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	143 local void build_tree OF((deflate_state s, tree_desc desc));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	144 local void scan_tree OF((deflate_state s, ct_data tree, int max_code));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	145 local void send_tree OF((deflate_state s, ct_data tree, int max_code));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	146 local int build_bl_tree OF((deflate_state *s));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	147 local void send_all_trees OF((deflate_state *s, int lcodes, int dcodes,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	148 int blcodes));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	149 local void compress_block OF((deflate_state s, const ct_data ltree,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	150 const ct_data *dtree));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	151 local int detect_data_type OF((deflate_state *s));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	152 local unsigned bi_reverse OF((unsigned value, int length));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	153 local void bi_windup OF((deflate_state *s));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	154 local void bi_flush OF((deflate_state *s));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	155
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	156 #ifdef GEN_TREES_H
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	157 local void gen_trees_header OF((void));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	158 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	159
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	160 #ifndef ZLIB_DEBUG
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	161 # define send_code(s, c, tree) send_bits(s, tree[c].Code, tree[c].Len)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	162 /* Send a code of the given tree. c and tree must not have side effects */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	163
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	164 #else /* !ZLIB_DEBUG */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	165 # define send_code(s, c, tree) \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	166 { if (z_verbose>2) fprintf(stderr,"\ncd %3d ",(c)); \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	167 send_bits(s, tree[c].Code, tree[c].Len); }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	168 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	169
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	170 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	171 * Output a short LSB first on the stream.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	172 * IN assertion: there is enough room in pendingBuf.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	173 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	174 #define put_short(s, w) { \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	175 put_byte(s, (uch)((w) & 0xff)); \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	176 put_byte(s, (uch)((ush)(w) >> 8)); \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	177 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	178
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	179 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	180 * Send a value on a given number of bits.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	181 * IN assertion: length <= 16 and value fits in length bits.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	182 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	183 #ifdef ZLIB_DEBUG
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	184 local void send_bits OF((deflate_state *s, int value, int length));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	185
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	186 local void send_bits(s, value, length)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	187 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	188 int value; /* value to send */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	189 int length; /* number of bits */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	190 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	191 Tracevv((stderr," l %2d v %4x ", length, value));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	192 Assert(length > 0 && length <= 15, "invalid length");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	193 s->bits_sent += (ulg)length;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	194
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	195 /* If not enough room in bi_buf, use (valid) bits from bi_buf and
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	196 * (16 - bi_valid) bits from value, leaving (width - (16-bi_valid))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	197 * unused bits in value.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	198 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	199 if (s->bi_valid > (int)Buf_size - length) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	200 s->bi_buf \|= (ush)value << s->bi_valid;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	201 put_short(s, s->bi_buf);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	202 s->bi_buf = (ush)value >> (Buf_size - s->bi_valid);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	203 s->bi_valid += length - Buf_size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	204 } else {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	205 s->bi_buf \|= (ush)value << s->bi_valid;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	206 s->bi_valid += length;
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 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	209 #else /* !ZLIB_DEBUG */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	210
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	211 #define send_bits(s, value, length) \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	212 { int len = length;\
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	213 if (s->bi_valid > (int)Buf_size - len) {\
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	214 int val = (int)value;\
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	215 s->bi_buf \|= (ush)val << s->bi_valid;\
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	216 put_short(s, s->bi_buf);\
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	217 s->bi_buf = (ush)val >> (Buf_size - s->bi_valid);\
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	218 s->bi_valid += len - Buf_size;\
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	219 } else {\
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	220 s->bi_buf \|= (ush)(value) << s->bi_valid;\
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	221 s->bi_valid += len;\
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 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	224 #endif /* ZLIB_DEBUG */
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 /* the arguments must not have side effects */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	228
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	229 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	230 * Initialize the various 'constant' tables.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	231 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	232 local void tr_static_init()
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 #if defined(GEN_TREES_H) \|\| !defined(STDC)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	235 static int static_init_done = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	236 int n; /* iterates over tree elements */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	237 int bits; /* bit counter */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	238 int length; /* length value */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	239 int code; /* code value */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	240 int dist; /* distance index */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	241 ush bl_count[MAX_BITS+1];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	242 /* number of codes at each bit length for an optimal tree */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	243
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	244 if (static_init_done) return;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	245
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	246 /* For some embedded targets, global variables are not initialized: */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	247 #ifdef NO_INIT_GLOBAL_POINTERS
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	248 static_l_desc.static_tree = static_ltree;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	249 static_l_desc.extra_bits = extra_lbits;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	250 static_d_desc.static_tree = static_dtree;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	251 static_d_desc.extra_bits = extra_dbits;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	252 static_bl_desc.extra_bits = extra_blbits;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	253 #endif
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 /* Initialize the mapping length (0..255) -> length code (0..28) */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	256 length = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	257 for (code = 0; code < LENGTH_CODES-1; code++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	258 base_length[code] = length;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	259 for (n = 0; n < (1<<extra_lbits[code]); n++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	260 _length_code[length++] = (uch)code;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	261 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	262 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	263 Assert (length == 256, "tr_static_init: length != 256");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	264 /* Note that the length 255 (match length 258) can be represented
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	265 * in two different ways: code 284 + 5 bits or code 285, so we
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	266 * overwrite length_code[255] to use the best encoding:
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	267 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	268 _length_code[length-1] = (uch)code;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	269
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	270 /* Initialize the mapping dist (0..32K) -> dist code (0..29) */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	271 dist = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	272 for (code = 0 ; code < 16; code++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	273 base_dist[code] = dist;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	274 for (n = 0; n < (1<<extra_dbits[code]); n++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	275 _dist_code[dist++] = (uch)code;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	276 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	277 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	278 Assert (dist == 256, "tr_static_init: dist != 256");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	279 dist >>= 7; /* from now on, all distances are divided by 128 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	280 for ( ; code < D_CODES; code++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	281 base_dist[code] = dist << 7;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	282 for (n = 0; n < (1<<(extra_dbits[code]-7)); n++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	283 _dist_code[256 + dist++] = (uch)code;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	284 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	285 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	286 Assert (dist == 256, "tr_static_init: 256+dist != 512");
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 /* Construct the codes of the static literal tree */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	289 for (bits = 0; bits <= MAX_BITS; bits++) bl_count[bits] = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	290 n = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	291 while (n <= 143) static_ltree[n++].Len = 8, bl_count[8]++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	292 while (n <= 255) static_ltree[n++].Len = 9, bl_count[9]++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	293 while (n <= 279) static_ltree[n++].Len = 7, bl_count[7]++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	294 while (n <= 287) static_ltree[n++].Len = 8, bl_count[8]++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	295 /* Codes 286 and 287 do not exist, but we must include them in the
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	296 * tree construction to get a canonical Huffman tree (longest code
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	297 * all ones)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	298 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	299 gen_codes((ct_data *)static_ltree, L_CODES+1, bl_count);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	300
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	301 /* The static distance tree is trivial: */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	302 for (n = 0; n < D_CODES; n++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	303 static_dtree[n].Len = 5;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	304 static_dtree[n].Code = bi_reverse((unsigned)n, 5);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	305 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	306 static_init_done = 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	307
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	308 # ifdef GEN_TREES_H
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	309 gen_trees_header();
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	310 # endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	311 #endif /* defined(GEN_TREES_H) \|\| !defined(STDC) */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	312 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	313
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	314 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	315 * Genererate the file trees.h describing the static trees.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	316 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	317 #ifdef GEN_TREES_H
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	318 # ifndef ZLIB_DEBUG
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	319 # include <stdio.h>
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	320 # endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	321
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	322 # define SEPARATOR(i, last, width) \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	323 ((i) == (last)? "\n};\n\n" : \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	324 ((i) % (width) == (width)-1 ? ",\n" : ", "))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	325
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	326 void gen_trees_header()
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	327 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	328 FILE *header = fopen("trees.h", "w");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	329 int i;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	330
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	331 Assert (header != NULL, "Can't open trees.h");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	332 fprintf(header,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	333 "/* header created automatically with -DGEN_TREES_H */\n\n");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	334
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	335 fprintf(header, "local const ct_data static_ltree[L_CODES+2] = {\n");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	336 for (i = 0; i < L_CODES+2; i++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	337 fprintf(header, "{{%3u},{%3u}}%s", static_ltree[i].Code,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	338 static_ltree[i].Len, SEPARATOR(i, L_CODES+1, 5));
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
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	341 fprintf(header, "local const ct_data static_dtree[D_CODES] = {\n");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	342 for (i = 0; i < D_CODES; i++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	343 fprintf(header, "{{%2u},{%2u}}%s", static_dtree[i].Code,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	344 static_dtree[i].Len, SEPARATOR(i, D_CODES-1, 5));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	345 }
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 fprintf(header, "const uch ZLIB_INTERNAL _dist_code[DIST_CODE_LEN] = {\n");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	348 for (i = 0; i < DIST_CODE_LEN; i++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	349 fprintf(header, "%2u%s", _dist_code[i],
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	350 SEPARATOR(i, DIST_CODE_LEN-1, 20));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	351 }
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 fprintf(header,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	354 "const uch ZLIB_INTERNAL _length_code[MAX_MATCH-MIN_MATCH+1]= {\n");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	355 for (i = 0; i < MAX_MATCH-MIN_MATCH+1; i++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	356 fprintf(header, "%2u%s", _length_code[i],
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	357 SEPARATOR(i, MAX_MATCH-MIN_MATCH, 20));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	358 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	359
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	360 fprintf(header, "local const int base_length[LENGTH_CODES] = {\n");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	361 for (i = 0; i < LENGTH_CODES; i++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	362 fprintf(header, "%1u%s", base_length[i],
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	363 SEPARATOR(i, LENGTH_CODES-1, 20));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	364 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	365
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	366 fprintf(header, "local const int base_dist[D_CODES] = {\n");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	367 for (i = 0; i < D_CODES; i++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	368 fprintf(header, "%5u%s", base_dist[i],
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	369 SEPARATOR(i, D_CODES-1, 10));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	370 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	371
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	372 fclose(header);
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 #endif /* GEN_TREES_H */
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 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	377 * Initialize the tree data structures for a new zlib stream.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	378 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	379 void ZLIB_INTERNAL _tr_init(s)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	380 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	381 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	382 tr_static_init();
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	383
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	384 s->l_desc.dyn_tree = s->dyn_ltree;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	385 s->l_desc.stat_desc = &static_l_desc;
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 s->d_desc.dyn_tree = s->dyn_dtree;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	388 s->d_desc.stat_desc = &static_d_desc;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	389
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	390 s->bl_desc.dyn_tree = s->bl_tree;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	391 s->bl_desc.stat_desc = &static_bl_desc;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	392
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	393 s->bi_buf = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	394 s->bi_valid = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	395 #ifdef ZLIB_DEBUG
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	396 s->compressed_len = 0L;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	397 s->bits_sent = 0L;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	398 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	399
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	400 /* Initialize the first block of the first file: */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	401 init_block(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	402 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	403
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	404 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	405 * Initialize a new block.
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 local void init_block(s)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	408 deflate_state *s;
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 int n; /* iterates over tree elements */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	411
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	412 /* Initialize the trees. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	413 for (n = 0; n < L_CODES; n++) s->dyn_ltree[n].Freq = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	414 for (n = 0; n < D_CODES; n++) s->dyn_dtree[n].Freq = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	415 for (n = 0; n < BL_CODES; n++) s->bl_tree[n].Freq = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	416
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	417 s->dyn_ltree[END_BLOCK].Freq = 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	418 s->opt_len = s->static_len = 0L;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	419 s->last_lit = s->matches = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	420 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	421
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	422 #define SMALLEST 1
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	423 /* Index within the heap array of least frequent node in the Huffman tree */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	424
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	425
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	426 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	427 * Remove the smallest element from the heap and recreate the heap with
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	428 * one less element. Updates heap and heap_len.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	429 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	430 #define pqremove(s, tree, top) \
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 top = s->heap[SMALLEST]; \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	433 s->heap[SMALLEST] = s->heap[s->heap_len--]; \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	434 pqdownheap(s, tree, SMALLEST); \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	435 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	436
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	437 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	438 * Compares to subtrees, using the tree depth as tie breaker when
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	439 * the subtrees have equal frequency. This minimizes the worst case length.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	440 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	441 #define smaller(tree, n, m, depth) \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	442 (tree[n].Freq < tree[m].Freq \|\| \
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	443 (tree[n].Freq == tree[m].Freq && depth[n] <= depth[m]))
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 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	446 * Restore the heap property by moving down the tree starting at node k,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	447 * exchanging a node with the smallest of its two sons if necessary, stopping
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	448 * when the heap property is re-established (each father smaller than its
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	449 * two sons).
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	450 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	451 local void pqdownheap(s, tree, k)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	452 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	453 ct_data tree; / the tree to restore */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	454 int k; /* node to move down */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	455 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	456 int v = s->heap[k];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	457 int j = k << 1; /* left son of k */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	458 while (j <= s->heap_len) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	459 /* Set j to the smallest of the two sons: */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	460 if (j < s->heap_len &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	461 smaller(tree, s->heap[j+1], s->heap[j], s->depth)) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	462 j++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	463 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	464 /* Exit if v is smaller than both sons */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	465 if (smaller(tree, v, s->heap[j], s->depth)) break;
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 /* Exchange v with the smallest son */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	468 s->heap[k] = s->heap[j]; k = j;
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 /* And continue down the tree, setting j to the left son of k */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	471 j <<= 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	472 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	473 s->heap[k] = v;
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 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	477 * Compute the optimal bit lengths for a tree and update the total bit length
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	478 * for the current block.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	479 * IN assertion: the fields freq and dad are set, heap[heap_max] and
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	480 * above are the tree nodes sorted by increasing frequency.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	481 * OUT assertions: the field len is set to the optimal bit length, the
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	482 * array bl_count contains the frequencies for each bit length.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	483 * The length opt_len is updated; static_len is also updated if stree is
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	484 * not null.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	485 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	486 local void gen_bitlen(s, desc)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	487 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	488 tree_desc desc; / the tree descriptor */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	489 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	490 ct_data *tree = desc->dyn_tree;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	491 int max_code = desc->max_code;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	492 const ct_data *stree = desc->stat_desc->static_tree;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	493 const intf *extra = desc->stat_desc->extra_bits;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	494 int base = desc->stat_desc->extra_base;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	495 int max_length = desc->stat_desc->max_length;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	496 int h; /* heap index */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	497 int n, m; /* iterate over the tree elements */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	498 int bits; /* bit length */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	499 int xbits; /* extra bits */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	500 ush f; /* frequency */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	501 int overflow = 0; /* number of elements with bit length too large */
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 for (bits = 0; bits <= MAX_BITS; bits++) s->bl_count[bits] = 0;
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 /* In a first pass, compute the optimal bit lengths (which may
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	506 * overflow in the case of the bit length tree).
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 tree[s->heap[s->heap_max]].Len = 0; /* root of the heap */
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 for (h = s->heap_max+1; h < HEAP_SIZE; h++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	511 n = s->heap[h];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	512 bits = tree[tree[n].Dad].Len + 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	513 if (bits > max_length) bits = max_length, overflow++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	514 tree[n].Len = (ush)bits;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	515 /* We overwrite tree[n].Dad which is no longer needed */
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 if (n > max_code) continue; /* not a leaf node */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	518
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	519 s->bl_count[bits]++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	520 xbits = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	521 if (n >= base) xbits = extra[n-base];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	522 f = tree[n].Freq;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	523 s->opt_len += (ulg)f * (unsigned)(bits + xbits);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	524 if (stree) s->static_len += (ulg)f * (unsigned)(stree[n].Len + xbits);
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 if (overflow == 0) return;
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 Tracev((stderr,"\nbit length overflow\n"));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	529 /* This happens for example on obj2 and pic of the Calgary corpus */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	530
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	531 /* Find the first bit length which could increase: */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	532 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	533 bits = max_length-1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	534 while (s->bl_count[bits] == 0) bits--;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	535 s->bl_count[bits]--; /* move one leaf down the tree */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	536 s->bl_count[bits+1] += 2; /* move one overflow item as its brother */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	537 s->bl_count[max_length]--;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	538 /* The brother of the overflow item also moves one step up,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	539 * but this does not affect bl_count[max_length]
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 overflow -= 2;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	542 } while (overflow > 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	543
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	544 /* Now recompute all bit lengths, scanning in increasing frequency.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	545 * h is still equal to HEAP_SIZE. (It is simpler to reconstruct all
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	546 * lengths instead of fixing only the wrong ones. This idea is taken
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	547 * from 'ar' written by Haruhiko Okumura.)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	548 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	549 for (bits = max_length; bits != 0; bits--) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	550 n = s->bl_count[bits];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	551 while (n != 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	552 m = s->heap[--h];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	553 if (m > max_code) continue;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	554 if ((unsigned) tree[m].Len != (unsigned) bits) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	555 Tracev((stderr,"code %d bits %d->%d\n", m, tree[m].Len, bits));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	556 s->opt_len += ((ulg)bits - tree[m].Len) * tree[m].Freq;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	557 tree[m].Len = (ush)bits;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	558 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	559 n--;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	560 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	561 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	562 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	563
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	564 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	565 * Generate the codes for a given tree and bit counts (which need not be
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	566 * optimal).
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	567 * IN assertion: the array bl_count contains the bit length statistics for
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	568 * the given tree and the field len is set for all tree elements.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	569 * OUT assertion: the field code is set for all tree elements of non
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	570 * zero code length.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	571 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	572 local void gen_codes (tree, max_code, bl_count)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	573 ct_data tree; / the tree to decorate */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	574 int max_code; /* largest code with non zero frequency */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	575 ushf bl_count; / number of codes at each bit length */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	576 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	577 ush next_code[MAX_BITS+1]; /* next code value for each bit length */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	578 unsigned code = 0; /* running code value */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	579 int bits; /* bit index */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	580 int n; /* code index */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	581
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	582 /* The distribution counts are first used to generate the code values
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	583 * without bit reversal.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	584 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	585 for (bits = 1; bits <= MAX_BITS; bits++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	586 code = (code + bl_count[bits-1]) << 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	587 next_code[bits] = (ush)code;
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 /* Check that the bit counts in bl_count are consistent. The last code
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	590 * must be all ones.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	591 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	592 Assert (code + bl_count[MAX_BITS]-1 == (1<<MAX_BITS)-1,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	593 "inconsistent bit counts");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	594 Tracev((stderr,"\ngen_codes: max_code %d ", max_code));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	595
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	596 for (n = 0; n <= max_code; n++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	597 int len = tree[n].Len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	598 if (len == 0) continue;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	599 /* Now reverse the bits */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	600 tree[n].Code = (ush)bi_reverse(next_code[len]++, len);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	601
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	602 Tracecv(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	603 n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	604 }
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
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	607 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	608 * Construct one Huffman tree and assigns the code bit strings and lengths.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	609 * Update the total bit length for the current block.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	610 * IN assertion: the field freq is set for all tree elements.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	611 * OUT assertions: the fields len and code are set to the optimal bit length
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	612 * and corresponding code. The length opt_len is updated; static_len is
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	613 * also updated if stree is not null. The field max_code is set.
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 local void build_tree(s, desc)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	616 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	617 tree_desc desc; / the tree descriptor */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	618 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	619 ct_data *tree = desc->dyn_tree;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	620 const ct_data *stree = desc->stat_desc->static_tree;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	621 int elems = desc->stat_desc->elems;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	622 int n, m; /* iterate over heap elements */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	623 int max_code = -1; /* largest code with non zero frequency */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	624 int node; /* new node being created */
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 /* Construct the initial heap, with least frequent element in
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	627 * heap[SMALLEST]. The sons of heap[n] are heap[2n] and heap[2n+1].
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	628 * heap[0] is not used.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	629 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	630 s->heap_len = 0, s->heap_max = HEAP_SIZE;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	631
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	632 for (n = 0; n < elems; n++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	633 if (tree[n].Freq != 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	634 s->heap[++(s->heap_len)] = max_code = n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	635 s->depth[n] = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	636 } else {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	637 tree[n].Len = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	638 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	639 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	640
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	641 /* The pkzip format requires that at least one distance code exists,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	642 * and that at least one bit should be sent even if there is only one
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	643 * possible code. So to avoid special checks later on we force at least
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	644 * two codes of non zero frequency.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	645 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	646 while (s->heap_len < 2) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	647 node = s->heap[++(s->heap_len)] = (max_code < 2 ? ++max_code : 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	648 tree[node].Freq = 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	649 s->depth[node] = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	650 s->opt_len--; if (stree) s->static_len -= stree[node].Len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	651 /* node is 0 or 1 so it does not have extra bits */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	652 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	653 desc->max_code = max_code;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	654
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	655 /* The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	656 * establish sub-heaps of increasing lengths:
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	657 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	658 for (n = s->heap_len/2; n >= 1; n--) pqdownheap(s, tree, n);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	659
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	660 /* Construct the Huffman tree by repeatedly combining the least two
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	661 * frequent nodes.
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 node = elems; /* next internal node of the tree */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	664 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	665 pqremove(s, tree, n); /* n = node of least frequency */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	666 m = s->heap[SMALLEST]; /* m = node of next least frequency */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	667
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	668 s->heap[--(s->heap_max)] = n; /* keep the nodes sorted by frequency */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	669 s->heap[--(s->heap_max)] = m;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	670
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	671 /* Create a new node father of n and m */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	672 tree[node].Freq = tree[n].Freq + tree[m].Freq;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	673 s->depth[node] = (uch)((s->depth[n] >= s->depth[m] ?
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	674 s->depth[n] : s->depth[m]) + 1);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	675 tree[n].Dad = tree[m].Dad = (ush)node;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	676 #ifdef DUMP_BL_TREE
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	677 if (tree == s->bl_tree) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	678 fprintf(stderr,"\nnode %d(%d), sons %d(%d) %d(%d)",
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	679 node, tree[node].Freq, n, tree[n].Freq, m, tree[m].Freq);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	680 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	681 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	682 /* and insert the new node in the heap */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	683 s->heap[SMALLEST] = node++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	684 pqdownheap(s, tree, SMALLEST);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	685
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	686 } while (s->heap_len >= 2);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	687
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	688 s->heap[--(s->heap_max)] = s->heap[SMALLEST];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	689
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	690 /* At this point, the fields freq and dad are set. We can now
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	691 * generate the bit lengths.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	692 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	693 gen_bitlen(s, (tree_desc *)desc);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	694
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	695 /* The field len is now set, we can generate the bit codes */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	696 gen_codes ((ct_data *)tree, max_code, s->bl_count);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	697 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	698
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	699 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	700 * Scan a literal or distance tree to determine the frequencies of the codes
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	701 * in the bit length tree.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	702 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	703 local void scan_tree (s, tree, max_code)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	704 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	705 ct_data tree; / the tree to be scanned */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	706 int max_code; /* and its largest code of non zero frequency */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	707 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	708 int n; /* iterates over all tree elements */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	709 int prevlen = -1; /* last emitted length */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	710 int curlen; /* length of current code */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	711 int nextlen = tree[0].Len; /* length of next code */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	712 int count = 0; /* repeat count of the current code */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	713 int max_count = 7; /* max repeat count */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	714 int min_count = 4; /* min repeat count */
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 if (nextlen == 0) max_count = 138, min_count = 3;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	717 tree[max_code+1].Len = (ush)0xffff; /* guard */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	718
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	719 for (n = 0; n <= max_code; n++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	720 curlen = nextlen; nextlen = tree[n+1].Len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	721 if (++count < max_count && curlen == nextlen) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	722 continue;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	723 } else if (count < min_count) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	724 s->bl_tree[curlen].Freq += count;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	725 } else if (curlen != 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	726 if (curlen != prevlen) s->bl_tree[curlen].Freq++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	727 s->bl_tree[REP_3_6].Freq++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	728 } else if (count <= 10) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	729 s->bl_tree[REPZ_3_10].Freq++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	730 } else {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	731 s->bl_tree[REPZ_11_138].Freq++;
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 count = 0; prevlen = curlen;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	734 if (nextlen == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	735 max_count = 138, min_count = 3;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	736 } else if (curlen == nextlen) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	737 max_count = 6, min_count = 3;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	738 } else {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	739 max_count = 7, min_count = 4;
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 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	742 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	743
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	744 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	745 * Send a literal or distance tree in compressed form, using the codes in
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	746 * bl_tree.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	747 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	748 local void send_tree (s, tree, max_code)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	749 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	750 ct_data tree; / the tree to be scanned */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	751 int max_code; /* and its largest code of non zero frequency */
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 int n; /* iterates over all tree elements */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	754 int prevlen = -1; /* last emitted length */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	755 int curlen; /* length of current code */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	756 int nextlen = tree[0].Len; /* length of next code */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	757 int count = 0; /* repeat count of the current code */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	758 int max_count = 7; /* max repeat count */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	759 int min_count = 4; /* min repeat count */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	760
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	761 /* tree[max_code+1].Len = -1; / / guard already set */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	762 if (nextlen == 0) max_count = 138, min_count = 3;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	763
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	764 for (n = 0; n <= max_code; n++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	765 curlen = nextlen; nextlen = tree[n+1].Len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	766 if (++count < max_count && curlen == nextlen) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	767 continue;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	768 } else if (count < min_count) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	769 do { send_code(s, curlen, s->bl_tree); } while (--count != 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	770
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	771 } else if (curlen != 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	772 if (curlen != prevlen) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	773 send_code(s, curlen, s->bl_tree); count--;
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 Assert(count >= 3 && count <= 6, " 3_6?");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	776 send_code(s, REP_3_6, s->bl_tree); send_bits(s, count-3, 2);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	777
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	778 } else if (count <= 10) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	779 send_code(s, REPZ_3_10, s->bl_tree); send_bits(s, count-3, 3);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	780
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	781 } else {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	782 send_code(s, REPZ_11_138, s->bl_tree); send_bits(s, count-11, 7);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	783 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	784 count = 0; prevlen = curlen;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	785 if (nextlen == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	786 max_count = 138, min_count = 3;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	787 } else if (curlen == nextlen) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	788 max_count = 6, min_count = 3;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	789 } else {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	790 max_count = 7, min_count = 4;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	791 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	792 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	793 }
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 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	796 * Construct the Huffman tree for the bit lengths and return the index in
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	797 * bl_order of the last bit length code to send.
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 local int build_bl_tree(s)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	800 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	801 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	802 int max_blindex; /* index of last bit length code of non zero freq */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	803
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	804 /* Determine the bit length frequencies for literal and distance trees */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	805 scan_tree(s, (ct_data *)s->dyn_ltree, s->l_desc.max_code);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	806 scan_tree(s, (ct_data *)s->dyn_dtree, s->d_desc.max_code);
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 /* Build the bit length tree: */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	809 build_tree(s, (tree_desc *)(&(s->bl_desc)));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	810 /* opt_len now includes the length of the tree representations, except
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	811 * the lengths of the bit lengths codes and the 5+5+4 bits for the counts.
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
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	814 /* Determine the number of bit length codes to send. The pkzip format
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	815 * requires that at least 4 bit length codes be sent. (appnote.txt says
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	816 * 3 but the actual value used is 4.)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	817 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	818 for (max_blindex = BL_CODES-1; max_blindex >= 3; max_blindex--) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	819 if (s->bl_tree[bl_order[max_blindex]].Len != 0) break;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	820 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	821 /* Update opt_len to include the bit length tree and counts */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	822 s->opt_len += 3*((ulg)max_blindex+1) + 5+5+4;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	823 Tracev((stderr, "\ndyn trees: dyn %ld, stat %ld",
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	824 s->opt_len, s->static_len));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	825
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	826 return max_blindex;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	827 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	828
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	829 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	830 * Send the header for a block using dynamic Huffman trees: the counts, the
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	831 * lengths of the bit length codes, the literal tree and the distance tree.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	832 * IN assertion: lcodes >= 257, dcodes >= 1, blcodes >= 4.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	833 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	834 local void send_all_trees(s, lcodes, dcodes, blcodes)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	835 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	836 int lcodes, dcodes, blcodes; /* number of codes for each tree */
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 int rank; /* index in bl_order */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	839
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	840 Assert (lcodes >= 257 && dcodes >= 1 && blcodes >= 4, "not enough codes");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	841 Assert (lcodes <= L_CODES && dcodes <= D_CODES && blcodes <= BL_CODES,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	842 "too many codes");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	843 Tracev((stderr, "\nbl counts: "));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	844 send_bits(s, lcodes-257, 5); /* not +255 as stated in appnote.txt */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	845 send_bits(s, dcodes-1, 5);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	846 send_bits(s, blcodes-4, 4); /* not -3 as stated in appnote.txt */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	847 for (rank = 0; rank < blcodes; rank++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	848 Tracev((stderr, "\nbl code %2d ", bl_order[rank]));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	849 send_bits(s, s->bl_tree[bl_order[rank]].Len, 3);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	850 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	851 Tracev((stderr, "\nbl tree: sent %ld", s->bits_sent));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	852
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	853 send_tree(s, (ct_data )s->dyn_ltree, lcodes-1); / literal tree */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	854 Tracev((stderr, "\nlit tree: sent %ld", s->bits_sent));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	855
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	856 send_tree(s, (ct_data )s->dyn_dtree, dcodes-1); / distance tree */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	857 Tracev((stderr, "\ndist tree: sent %ld", s->bits_sent));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	858 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	859
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	860 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	861 * Send a stored block
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	862 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	863 void ZLIB_INTERNAL _tr_stored_block(s, buf, stored_len, last)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	864 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	865 charf buf; / input block */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	866 ulg stored_len; /* length of input block */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	867 int last; /* one if this is the last block for a file */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	868 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	869 send_bits(s, (STORED_BLOCK<<1)+last, 3); /* send block type */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	870 bi_windup(s); /* align on byte boundary */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	871 put_short(s, (ush)stored_len);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	872 put_short(s, (ush)~stored_len);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	873 zmemcpy(s->pending_buf + s->pending, (Bytef *)buf, stored_len);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	874 s->pending += stored_len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	875 #ifdef ZLIB_DEBUG
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	876 s->compressed_len = (s->compressed_len + 3 + 7) & (ulg)~7L;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	877 s->compressed_len += (stored_len + 4) << 3;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	878 s->bits_sent += 2*16;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	879 s->bits_sent += stored_len<<3;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	880 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	881 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	882
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	883 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	884 * Flush the bits in the bit buffer to pending output (leaves at most 7 bits)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	885 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	886 void ZLIB_INTERNAL _tr_flush_bits(s)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	887 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	888 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	889 bi_flush(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	890 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	891
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 * Send one empty static block to give enough lookahead for inflate.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	894 * This takes 10 bits, of which 7 may remain in the bit buffer.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	895 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	896 void ZLIB_INTERNAL _tr_align(s)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	897 deflate_state *s;
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 send_bits(s, STATIC_TREES<<1, 3);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	900 send_code(s, END_BLOCK, static_ltree);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	901 #ifdef ZLIB_DEBUG
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	902 s->compressed_len += 10L; /* 3 for block type, 7 for EOB */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	903 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	904 bi_flush(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	905 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	906
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	907 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	908 * Determine the best encoding for the current block: dynamic trees, static
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	909 * trees or store, and write out the encoded block.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	910 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	911 void ZLIB_INTERNAL _tr_flush_block(s, buf, stored_len, last)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	912 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	913 charf buf; / input block, or NULL if too old */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	914 ulg stored_len; /* length of input block */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	915 int last; /* one if this is the last block for a file */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	916 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	917 ulg opt_lenb, static_lenb; /* opt_len and static_len in bytes */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	918 int max_blindex = 0; /* index of last bit length code of non zero freq */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	919
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	920 /* Build the Huffman trees unless a stored block is forced */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	921 if (s->level > 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	922
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	923 /* Check if the file is binary or text */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	924 if (s->strm->data_type == Z_UNKNOWN)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	925 s->strm->data_type = detect_data_type(s);
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 /* Construct the literal and distance trees */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	928 build_tree(s, (tree_desc *)(&(s->l_desc)));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	929 Tracev((stderr, "\nlit data: dyn %ld, stat %ld", s->opt_len,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	930 s->static_len));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	931
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	932 build_tree(s, (tree_desc *)(&(s->d_desc)));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	933 Tracev((stderr, "\ndist data: dyn %ld, stat %ld", s->opt_len,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	934 s->static_len));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	935 /* At this point, opt_len and static_len are the total bit lengths of
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	936 * the compressed block data, excluding the tree representations.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	937 */
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 /* Build the bit length tree for the above two trees, and get the index
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	940 * in bl_order of the last bit length code to send.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	941 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	942 max_blindex = build_bl_tree(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	943
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	944 /* Determine the best encoding. Compute the block lengths in bytes. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	945 opt_lenb = (s->opt_len+3+7)>>3;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	946 static_lenb = (s->static_len+3+7)>>3;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	947
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	948 Tracev((stderr, "\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u ",
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	949 opt_lenb, s->opt_len, static_lenb, s->static_len, stored_len,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	950 s->last_lit));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	951
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	952 if (static_lenb <= opt_lenb) opt_lenb = static_lenb;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	953
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	954 } else {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	955 Assert(buf != (char*)0, "lost buf");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	956 opt_lenb = static_lenb = stored_len + 5; /* force a stored block */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	957 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	958
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	959 #ifdef FORCE_STORED
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	960 if (buf != (char)0) { / force stored block */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	961 #else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	962 if (stored_len+4 <= opt_lenb && buf != (char*)0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	963 /* 4: two words for the lengths */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	964 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	965 /* The test buf != NULL is only necessary if LIT_BUFSIZE > WSIZE.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	966 * Otherwise we can't have processed more than WSIZE input bytes since
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	967 * the last block flush, because compression would have been
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	968 * successful. If LIT_BUFSIZE <= WSIZE, it is never too late to
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	969 * transform a block into a stored block.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	970 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	971 _tr_stored_block(s, buf, stored_len, last);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	972
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	973 #ifdef FORCE_STATIC
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	974 } else if (static_lenb >= 0) { /* force static trees */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	975 #else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	976 } else if (s->strategy == Z_FIXED \|\| static_lenb == opt_lenb) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	977 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	978 send_bits(s, (STATIC_TREES<<1)+last, 3);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	979 compress_block(s, (const ct_data *)static_ltree,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	980 (const ct_data *)static_dtree);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	981 #ifdef ZLIB_DEBUG
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	982 s->compressed_len += 3 + s->static_len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	983 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	984 } else {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	985 send_bits(s, (DYN_TREES<<1)+last, 3);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	986 send_all_trees(s, s->l_desc.max_code+1, s->d_desc.max_code+1,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	987 max_blindex+1);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	988 compress_block(s, (const ct_data *)s->dyn_ltree,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	989 (const ct_data *)s->dyn_dtree);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	990 #ifdef ZLIB_DEBUG
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	991 s->compressed_len += 3 + s->opt_len;
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 Assert (s->compressed_len == s->bits_sent, "bad compressed size");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	995 /* The above check is made mod 2^32, for files larger than 512 MB
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	996 * and uLong implemented on 32 bits.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	997 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	998 init_block(s);
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 if (last) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1001 bi_windup(s);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1002 #ifdef ZLIB_DEBUG
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1003 s->compressed_len += 7; /* align on byte boundary */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1004 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1005 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1006 Tracev((stderr,"\ncomprlen %lu(%lu) ", s->compressed_len>>3,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1007 s->compressed_len-7*last));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1008 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1009
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1010 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1011 * Save the match info and tally the frequency counts. Return true if
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1012 * the current block must be flushed.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1013 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1014 int ZLIB_INTERNAL _tr_tally (s, dist, lc)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1015 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1016 unsigned dist; /* distance of matched string */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1017 unsigned lc; /* match length-MIN_MATCH or unmatched char (if dist==0) */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1018 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1019 s->d_buf[s->last_lit] = (ush)dist;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1020 s->l_buf[s->last_lit++] = (uch)lc;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1021 if (dist == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1022 /* lc is the unmatched char */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1023 s->dyn_ltree[lc].Freq++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1024 } else {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1025 s->matches++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1026 /* Here, lc is the match length - MIN_MATCH */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1027 dist--; /* dist = match distance - 1 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1028 Assert((ush)dist < (ush)MAX_DIST(s) &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1029 (ush)lc <= (ush)(MAX_MATCH-MIN_MATCH) &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1030 (ush)d_code(dist) < (ush)D_CODES, "_tr_tally: bad match");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1031
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1032 s->dyn_ltree[_length_code[lc]+LITERALS+1].Freq++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1033 s->dyn_dtree[d_code(dist)].Freq++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1034 }
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 #ifdef TRUNCATE_BLOCK
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1037 /* Try to guess if it is profitable to stop the current block here */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1038 if ((s->last_lit & 0x1fff) == 0 && s->level > 2) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1039 /* Compute an upper bound for the compressed length */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1040 ulg out_length = (ulg)s->last_lit*8L;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1041 ulg in_length = (ulg)((long)s->strstart - s->block_start);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1042 int dcode;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1043 for (dcode = 0; dcode < D_CODES; dcode++) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1044 out_length += (ulg)s->dyn_dtree[dcode].Freq *
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1045 (5L+extra_dbits[dcode]);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1046 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1047 out_length >>= 3;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1048 Tracev((stderr,"\nlast_lit %u, in %ld, out ~%ld(%ld%%) ",
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1049 s->last_lit, in_length, out_length,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1050 100L - out_length*100L/in_length));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1051 if (s->matches < s->last_lit/2 && out_length < in_length/2) return 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1052 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1053 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1054 return (s->last_lit == s->lit_bufsize-1);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1055 /* We avoid equality with lit_bufsize because of wraparound at 64K
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1056 * on 16 bit machines and because stored blocks are restricted to
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1057 * 64K-1 bytes.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1058 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1059 }
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 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1062 * Send the block data compressed using the given Huffman trees
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 local void compress_block(s, ltree, dtree)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1065 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1066 const ct_data ltree; / literal tree */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1067 const ct_data dtree; / distance tree */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1068 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1069 unsigned dist; /* distance of matched string */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1070 int lc; /* match length or unmatched char (if dist == 0) */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1071 unsigned lx = 0; /* running index in l_buf */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1072 unsigned code; /* the code to send */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1073 int extra; /* number of extra bits to send */
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 if (s->last_lit != 0) do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1076 dist = s->d_buf[lx];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1077 lc = s->l_buf[lx++];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1078 if (dist == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1079 send_code(s, lc, ltree); /* send a literal byte */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1080 Tracecv(isgraph(lc), (stderr," '%c' ", lc));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1081 } else {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1082 /* Here, lc is the match length - MIN_MATCH */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1083 code = _length_code[lc];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1084 send_code(s, code+LITERALS+1, ltree); /* send the length code */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1085 extra = extra_lbits[code];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1086 if (extra != 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1087 lc -= base_length[code];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1088 send_bits(s, lc, extra); /* send the extra length bits */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1089 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1090 dist--; /* dist is now the match distance - 1 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1091 code = d_code(dist);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1092 Assert (code < D_CODES, "bad d_code");
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 send_code(s, code, dtree); /* send the distance code */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1095 extra = extra_dbits[code];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1096 if (extra != 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1097 dist -= (unsigned)base_dist[code];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1098 send_bits(s, dist, extra); /* send the extra distance bits */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1099 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1100 } /* literal or match pair ? */
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 /* Check that the overlay between pending_buf and d_buf+l_buf is ok: */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1103 Assert((uInt)(s->pending) < s->lit_bufsize + 2*lx,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1104 "pendingBuf overflow");
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 } while (lx < s->last_lit);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1107
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1108 send_code(s, END_BLOCK, ltree);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1109 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1110
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1111 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1112 * Check if the data type is TEXT or BINARY, using the following algorithm:
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1113 * - TEXT if the two conditions below are satisfied:
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1114 * a) There are no non-portable control characters belonging to the
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1115 * "black list" (0..6, 14..25, 28..31).
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1116 * b) There is at least one printable character belonging to the
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1117 * "white list" (9 {TAB}, 10 {LF}, 13 {CR}, 32..255).
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1118 * - BINARY otherwise.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1119 * - The following partially-portable control characters form a
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1120 * "gray list" that is ignored in this detection algorithm:
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1121 * (7 {BEL}, 8 {BS}, 11 {VT}, 12 {FF}, 26 {SUB}, 27 {ESC}).
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1122 * IN assertion: the fields Freq of dyn_ltree are set.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1123 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1124 local int detect_data_type(s)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1125 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1126 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1127 /* black_mask is the bit mask of black-listed bytes
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1128 * set bits 0..6, 14..25, and 28..31
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1129 * 0xf3ffc07f = binary 11110011111111111100000001111111
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1130 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1131 unsigned long black_mask = 0xf3ffc07fUL;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1132 int n;
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 /* Check for non-textual ("black-listed") bytes. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1135 for (n = 0; n <= 31; n++, black_mask >>= 1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1136 if ((black_mask & 1) && (s->dyn_ltree[n].Freq != 0))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1137 return Z_BINARY;
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 /* Check for textual ("white-listed") bytes. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1140 if (s->dyn_ltree[9].Freq != 0 \|\| s->dyn_ltree[10].Freq != 0
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1141 \|\| s->dyn_ltree[13].Freq != 0)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1142 return Z_TEXT;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1143 for (n = 32; n < LITERALS; n++)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1144 if (s->dyn_ltree[n].Freq != 0)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1145 return Z_TEXT;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1146
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1147 /* There are no "black-listed" or "white-listed" bytes:
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1148 * this stream either is empty or has tolerated ("gray-listed") bytes only.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1149 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1150 return Z_BINARY;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1151 }
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 /* ===========================================================================
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1154 * Reverse the first len bits of a code, using straightforward code (a faster
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1155 * method would use a table)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1156 * IN assertion: 1 <= len <= 15
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 local unsigned bi_reverse(code, len)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1159 unsigned code; /* the value to invert */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1160 int len; /* its bit length */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1161 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1162 register unsigned res = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1163 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1164 res \|= code & 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1165 code >>= 1, res <<= 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1166 } while (--len > 0);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1167 return res >> 1;
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
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 * Flush the bit buffer, keeping at most 7 bits in it.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1172 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1173 local void bi_flush(s)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1174 deflate_state *s;
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 if (s->bi_valid == 16) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1177 put_short(s, s->bi_buf);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1178 s->bi_buf = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1179 s->bi_valid = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1180 } else if (s->bi_valid >= 8) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1181 put_byte(s, (Byte)s->bi_buf);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1182 s->bi_buf >>= 8;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1183 s->bi_valid -= 8;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1184 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1185 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1186
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 * Flush the bit buffer and align the output on a byte boundary
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 local void bi_windup(s)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1191 deflate_state *s;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1192 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1193 if (s->bi_valid > 8) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1194 put_short(s, s->bi_buf);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1195 } else if (s->bi_valid > 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1196 put_byte(s, (Byte)s->bi_buf);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1197 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1198 s->bi_buf = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1199 s->bi_valid = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1200 #ifdef ZLIB_DEBUG
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1201 s->bits_sent = (s->bits_sent+7) & ~7;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1202 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1203 }

Mercurial > repos > blastem

annotate zlib/trees.c @ 1746:cd6f4cea97b6