repos/blastem: zlib/gzread.c annotate

annotate zlib/gzread.c @ 1971:80920c21bb52

Add an event log soft flush and call it twice per frame in between hard flushes to netplay latency when there are insufficient hardware updates to flush packets in the middle of a frame

author	Michael Pavone <pavone@retrodev.com>
date	Fri, 08 May 2020 11:40:30 -0700
parents	00d788dac91a
children

rev	line source
1530 00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	1 /* gzread.c -- zlib functions for reading gzip files
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	2 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	3 * For conditions of distribution and use, see copyright notice in zlib.h
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	4 */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	5
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	6 #include "gzguts.h"
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 /* Local functions */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	9 local int gz_load OF((gz_statep, unsigned char , unsigned, unsigned ));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	10 local int gz_avail OF((gz_statep));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	11 local int gz_look OF((gz_statep));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	12 local int gz_decomp OF((gz_statep));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	13 local int gz_fetch OF((gz_statep));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	14 local int gz_skip OF((gz_statep, z_off64_t));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	15 local z_size_t gz_read OF((gz_statep, voidp, z_size_t));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	16
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	17 /* Use read() to load a buffer -- return -1 on error, otherwise 0. Read from
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	18 state->fd, and update state->eof, state->err, and state->msg as appropriate.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	19 This function needs to loop on read(), since read() is not guaranteed to
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	20 read the number of bytes requested, depending on the type of descriptor. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	21 local int gz_load(state, buf, len, have)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	22 gz_statep state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	23 unsigned char *buf;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	24 unsigned len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	25 unsigned *have;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	26 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	27 int ret;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	28 unsigned get, max = ((unsigned)-1 >> 2) + 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	29
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	30 *have = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	31 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	32 get = len - *have;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	33 if (get > max)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	34 get = max;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	35 ret = read(state->fd, buf + *have, get);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	36 if (ret <= 0)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	37 break;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	38 *have += (unsigned)ret;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	39 } while (*have < len);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	40 if (ret < 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	41 gz_error(state, Z_ERRNO, zstrerror());
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	42 return -1;
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 if (ret == 0)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	45 state->eof = 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	46 return 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	47 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	48
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	49 /* Load up input buffer and set eof flag if last data loaded -- return -1 on
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	50 error, 0 otherwise. Note that the eof flag is set when the end of the input
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	51 file is reached, even though there may be unused data in the buffer. Once
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	52 that data has been used, no more attempts will be made to read the file.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	53 If strm->avail_in != 0, then the current data is moved to the beginning of
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	54 the input buffer, and then the remainder of the buffer is loaded with the
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	55 available data from the input file. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	56 local int gz_avail(state)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	57 gz_statep state;
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 unsigned got;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	60 z_streamp strm = &(state->strm);
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 if (state->err != Z_OK && state->err != Z_BUF_ERROR)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	63 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	64 if (state->eof == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	65 if (strm->avail_in) { /* copy what's there to the start */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	66 unsigned char *p = state->in;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	67 unsigned const char *q = strm->next_in;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	68 unsigned n = strm->avail_in;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	69 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	70 p++ = q++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	71 } while (--n);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	72 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	73 if (gz_load(state, state->in + strm->avail_in,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	74 state->size - strm->avail_in, &got) == -1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	75 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	76 strm->avail_in += got;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	77 strm->next_in = state->in;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	78 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	79 return 0;
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
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	82 /* Look for gzip header, set up for inflate or copy. state->x.have must be 0.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	83 If this is the first time in, allocate required memory. state->how will be
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	84 left unchanged if there is no more input data available, will be set to COPY
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	85 if there is no gzip header and direct copying will be performed, or it will
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	86 be set to GZIP for decompression. If direct copying, then leftover input
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	87 data from the input buffer will be copied to the output buffer. In that
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	88 case, all further file reads will be directly to either the output buffer or
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	89 a user buffer. If decompressing, the inflate state will be initialized.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	90 gz_look() will return 0 on success or -1 on failure. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	91 local int gz_look(state)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	92 gz_statep state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	93 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	94 z_streamp strm = &(state->strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	95
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	96 /* allocate read buffers and inflate memory */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	97 if (state->size == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	98 /* allocate buffers */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	99 state->in = (unsigned char *)malloc(state->want);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	100 state->out = (unsigned char *)malloc(state->want << 1);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	101 if (state->in == NULL \|\| state->out == NULL) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	102 free(state->out);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	103 free(state->in);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	104 gz_error(state, Z_MEM_ERROR, "out of memory");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	105 return -1;
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 state->size = state->want;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	108
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	109 /* allocate inflate memory */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	110 state->strm.zalloc = Z_NULL;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	111 state->strm.zfree = Z_NULL;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	112 state->strm.opaque = Z_NULL;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	113 state->strm.avail_in = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	114 state->strm.next_in = Z_NULL;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	115 if (inflateInit2(&(state->strm), 15 + 16) != Z_OK) { /* gunzip */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	116 free(state->out);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	117 free(state->in);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	118 state->size = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	119 gz_error(state, Z_MEM_ERROR, "out of memory");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	120 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	121 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	122 }
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 /* get at least the magic bytes in the input buffer */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	125 if (strm->avail_in < 2) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	126 if (gz_avail(state) == -1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	127 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	128 if (strm->avail_in == 0)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	129 return 0;
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
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	132 /* look for gzip magic bytes -- if there, do gzip decoding (note: there is
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	133 a logical dilemma here when considering the case of a partially written
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	134 gzip file, to wit, if a single 31 byte is written, then we cannot tell
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	135 whether this is a single-byte file, or just a partially written gzip
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	136 file -- for here we assume that if a gzip file is being written, then
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	137 the header will be written in a single operation, so that reading a
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	138 single byte is sufficient indication that it is not a gzip file) */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	139 if (strm->avail_in > 1 &&
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	140 strm->next_in[0] == 31 && strm->next_in[1] == 139) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	141 inflateReset(strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	142 state->how = GZIP;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	143 state->direct = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	144 return 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	145 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	146
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	147 /* no gzip header -- if we were decoding gzip before, then this is trailing
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	148 garbage. Ignore the trailing garbage and finish. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	149 if (state->direct == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	150 strm->avail_in = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	151 state->eof = 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	152 state->x.have = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	153 return 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	154 }
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 /* doing raw i/o, copy any leftover input to output -- this assumes that
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	157 the output buffer is larger than the input buffer, which also assures
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	158 space for gzungetc() */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	159 state->x.next = state->out;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	160 if (strm->avail_in) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	161 memcpy(state->x.next, strm->next_in, strm->avail_in);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	162 state->x.have = strm->avail_in;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	163 strm->avail_in = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	164 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	165 state->how = COPY;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	166 state->direct = 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	167 return 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	168 }
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 /* Decompress from input to the provided next_out and avail_out in the state.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	171 On return, state->x.have and state->x.next point to the just decompressed
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	172 data. If the gzip stream completes, state->how is reset to LOOK to look for
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	173 the next gzip stream or raw data, once state->x.have is depleted. Returns 0
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	174 on success, -1 on failure. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	175 local int gz_decomp(state)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	176 gz_statep state;
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 int ret = Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	179 unsigned had;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	180 z_streamp strm = &(state->strm);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	181
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	182 /* fill output buffer up to end of deflate stream */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	183 had = strm->avail_out;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	184 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	185 /* get more input for inflate() */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	186 if (strm->avail_in == 0 && gz_avail(state) == -1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	187 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	188 if (strm->avail_in == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	189 gz_error(state, Z_BUF_ERROR, "unexpected end of file");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	190 break;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	191 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	192
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	193 /* decompress and handle errors */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	194 ret = inflate(strm, Z_NO_FLUSH);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	195 if (ret == Z_STREAM_ERROR \|\| ret == Z_NEED_DICT) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	196 gz_error(state, Z_STREAM_ERROR,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	197 "internal error: inflate stream corrupt");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	198 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	199 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	200 if (ret == Z_MEM_ERROR) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	201 gz_error(state, Z_MEM_ERROR, "out of memory");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	202 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	203 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	204 if (ret == Z_DATA_ERROR) { /* deflate stream invalid */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	205 gz_error(state, Z_DATA_ERROR,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	206 strm->msg == NULL ? "compressed data error" : strm->msg);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	207 return -1;
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 } while (strm->avail_out && ret != Z_STREAM_END);
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 /* update available output */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	212 state->x.have = had - strm->avail_out;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	213 state->x.next = strm->next_out - state->x.have;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	214
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	215 /* if the gzip stream completed successfully, look for another */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	216 if (ret == Z_STREAM_END)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	217 state->how = LOOK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	218
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	219 /* good decompression */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	220 return 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	221 }
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 /* Fetch data and put it in the output buffer. Assumes state->x.have is 0.
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	224 Data is either copied from the input file or decompressed from the input
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	225 file depending on state->how. If state->how is LOOK, then a gzip header is
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	226 looked for to determine whether to copy or decompress. Returns -1 on error,
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	227 otherwise 0. gz_fetch() will leave state->how as COPY or GZIP unless the
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	228 end of the input file has been reached and all data has been processed. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	229 local int gz_fetch(state)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	230 gz_statep state;
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 z_streamp strm = &(state->strm);
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 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	235 switch(state->how) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	236 case LOOK: /* -> LOOK, COPY (only if never GZIP), or GZIP */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	237 if (gz_look(state) == -1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	238 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	239 if (state->how == LOOK)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	240 return 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	241 break;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	242 case COPY: /* -> COPY */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	243 if (gz_load(state, state->out, state->size << 1, &(state->x.have))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	244 == -1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	245 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	246 state->x.next = state->out;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	247 return 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	248 case GZIP: /* -> GZIP or LOOK (if end of gzip stream) */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	249 strm->avail_out = state->size << 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	250 strm->next_out = state->out;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	251 if (gz_decomp(state) == -1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	252 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	253 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	254 } while (state->x.have == 0 && (!state->eof \|\| strm->avail_in));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	255 return 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	256 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	257
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	258 /* Skip len uncompressed bytes of output. Return -1 on error, 0 on success. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	259 local int gz_skip(state, len)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	260 gz_statep state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	261 z_off64_t len;
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 unsigned n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	264
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	265 /* skip over len bytes or reach end-of-file, whichever comes first */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	266 while (len)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	267 /* skip over whatever is in output buffer */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	268 if (state->x.have) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	269 n = GT_OFF(state->x.have) \|\| (z_off64_t)state->x.have > len ?
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	270 (unsigned)len : state->x.have;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	271 state->x.have -= n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	272 state->x.next += n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	273 state->x.pos += n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	274 len -= n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	275 }
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 /* output buffer empty -- return if we're at the end of the input */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	278 else if (state->eof && state->strm.avail_in == 0)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	279 break;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	280
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	281 /* need more data to skip -- load up output buffer */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	282 else {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	283 /* get more output, looking for header if required */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	284 if (gz_fetch(state) == -1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	285 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	286 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	287 return 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	288 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	289
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	290 /* Read len bytes into buf from file, or less than len up to the end of the
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	291 input. Return the number of bytes read. If zero is returned, either the
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	292 end of file was reached, or there was an error. state->err must be
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	293 consulted in that case to determine which. */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	294 local z_size_t gz_read(state, buf, len)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	295 gz_statep state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	296 voidp buf;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	297 z_size_t len;
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 z_size_t got;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	300 unsigned n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	301
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	302 /* if len is zero, avoid unnecessary operations */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	303 if (len == 0)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	304 return 0;
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 /* process a skip request */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	307 if (state->seek) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	308 state->seek = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	309 if (gz_skip(state, state->skip) == -1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	310 return 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	311 }
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 /* get len bytes to buf, or less than len if at the end */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	314 got = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	315 do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	316 /* set n to the maximum amount of len that fits in an unsigned int */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	317 n = -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	318 if (n > len)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	319 n = len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	320
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	321 /* first just try copying data from the output buffer */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	322 if (state->x.have) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	323 if (state->x.have < n)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	324 n = state->x.have;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	325 memcpy(buf, state->x.next, n);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	326 state->x.next += n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	327 state->x.have -= n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	328 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	329
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	330 /* output buffer empty -- return if we're at the end of the input */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	331 else if (state->eof && state->strm.avail_in == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	332 state->past = 1; /* tried to read past end */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	333 break;
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
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	336 /* need output data -- for small len or new stream load up our output
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	337 buffer */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	338 else if (state->how == LOOK \|\| n < (state->size << 1)) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	339 /* get more output, looking for header if required */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	340 if (gz_fetch(state) == -1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	341 return 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	342 continue; /* no progress yet -- go back to copy above */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	343 /* the copy above assures that we will leave with space in the
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	344 output buffer, allowing at least one gzungetc() to succeed */
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 /* large len -- read directly into user buffer */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	348 else if (state->how == COPY) { /* read directly */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	349 if (gz_load(state, (unsigned char *)buf, n, &n) == -1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	350 return 0;
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 /* large len -- decompress directly into user buffer */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	354 else { /* state->how == GZIP */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	355 state->strm.avail_out = n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	356 state->strm.next_out = (unsigned char *)buf;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	357 if (gz_decomp(state) == -1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	358 return 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	359 n = state->x.have;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	360 state->x.have = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	361 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	362
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	363 /* update progress */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	364 len -= n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	365 buf = (char *)buf + n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	366 got += n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	367 state->x.pos += n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	368 } while (len);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	369
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	370 /* return number of bytes read into user buffer */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	371 return got;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	372 }
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 /* -- see zlib.h -- */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	375 int ZEXPORT gzread(file, buf, len)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	376 gzFile file;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	377 voidp buf;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	378 unsigned len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	379 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	380 gz_statep state;
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 /* get internal structure */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	383 if (file == NULL)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	384 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	385 state = (gz_statep)file;
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 /* check that we're reading and that there's no (serious) error */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	388 if (state->mode != GZ_READ \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	389 (state->err != Z_OK && state->err != Z_BUF_ERROR))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	390 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	391
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	392 /* since an int is returned, make sure len fits in one, otherwise return
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	393 with an error (this avoids a flaw in the interface) */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	394 if ((int)len < 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	395 gz_error(state, Z_STREAM_ERROR, "request does not fit in an int");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	396 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	397 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	398
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	399 /* read len or fewer bytes to buf */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	400 len = gz_read(state, buf, len);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	401
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	402 /* check for an error */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	403 if (len == 0 && state->err != Z_OK && state->err != Z_BUF_ERROR)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	404 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	405
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	406 /* return the number of bytes read (this is assured to fit in an int) */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	407 return (int)len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	408 }
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 /* -- see zlib.h -- */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	411 z_size_t ZEXPORT gzfread(buf, size, nitems, file)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	412 voidp buf;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	413 z_size_t size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	414 z_size_t nitems;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	415 gzFile file;
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 z_size_t len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	418 gz_statep state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	419
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	420 /* get internal structure */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	421 if (file == NULL)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	422 return 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	423 state = (gz_statep)file;
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 /* check that we're reading and that there's no (serious) error */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	426 if (state->mode != GZ_READ \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	427 (state->err != Z_OK && state->err != Z_BUF_ERROR))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	428 return 0;
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 /* compute bytes to read -- error on overflow */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	431 len = nitems * size;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	432 if (size && len / size != nitems) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	433 gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	434 return 0;
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 /* read len or fewer bytes to buf, return the number of full items read */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	438 return len ? gz_read(state, buf, len) / size : 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	439 }
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 /* -- see zlib.h -- */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	442 #ifdef Z_PREFIX_SET
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	443 # undef z_gzgetc
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	444 #else
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	445 # undef gzgetc
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	446 #endif
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	447 int ZEXPORT gzgetc(file)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	448 gzFile file;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	449 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	450 int ret;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	451 unsigned char buf[1];
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	452 gz_statep state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	453
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	454 /* get internal structure */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	455 if (file == NULL)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	456 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	457 state = (gz_statep)file;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	458
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	459 /* check that we're reading and that there's no (serious) error */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	460 if (state->mode != GZ_READ \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	461 (state->err != Z_OK && state->err != Z_BUF_ERROR))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	462 return -1;
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 /* try output buffer (no need to check for skip request) */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	465 if (state->x.have) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	466 state->x.have--;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	467 state->x.pos++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	468 return *(state->x.next)++;
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
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	471 /* nothing there -- try gz_read() */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	472 ret = gz_read(state, buf, 1);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	473 return ret < 1 ? -1 : buf[0];
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 int ZEXPORT gzgetc_(file)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	477 gzFile file;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	478 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	479 return gzgetc(file);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	480 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	481
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	482 /* -- see zlib.h -- */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	483 int ZEXPORT gzungetc(c, file)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	484 int c;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	485 gzFile file;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	486 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	487 gz_statep state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	488
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	489 /* get internal structure */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	490 if (file == NULL)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	491 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	492 state = (gz_statep)file;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	493
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	494 /* check that we're reading and that there's no (serious) error */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	495 if (state->mode != GZ_READ \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	496 (state->err != Z_OK && state->err != Z_BUF_ERROR))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	497 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	498
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	499 /* process a skip request */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	500 if (state->seek) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	501 state->seek = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	502 if (gz_skip(state, state->skip) == -1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	503 return -1;
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
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	506 /* can't push EOF */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	507 if (c < 0)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	508 return -1;
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 /* if output buffer empty, put byte at end (allows more pushing) */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	511 if (state->x.have == 0) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	512 state->x.have = 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	513 state->x.next = state->out + (state->size << 1) - 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	514 state->x.next[0] = (unsigned char)c;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	515 state->x.pos--;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	516 state->past = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	517 return c;
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
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	520 /* if no room, give up (must have already done a gzungetc()) */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	521 if (state->x.have == (state->size << 1)) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	522 gz_error(state, Z_DATA_ERROR, "out of room to push characters");
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	523 return -1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	524 }
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 /* slide output data if needed and insert byte before existing data */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	527 if (state->x.next == state->out) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	528 unsigned char *src = state->out + state->x.have;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	529 unsigned char *dest = state->out + (state->size << 1);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	530 while (src > state->out)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	531 --dest = --src;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	532 state->x.next = dest;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	533 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	534 state->x.have++;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	535 state->x.next--;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	536 state->x.next[0] = (unsigned char)c;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	537 state->x.pos--;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	538 state->past = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	539 return c;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	540 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	541
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	542 /* -- see zlib.h -- */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	543 char * ZEXPORT gzgets(file, buf, len)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	544 gzFile file;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	545 char *buf;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	546 int len;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	547 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	548 unsigned left, n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	549 char *str;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	550 unsigned char *eol;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	551 gz_statep state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	552
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	553 /* check parameters and get internal structure */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	554 if (file == NULL \|\| buf == NULL \|\| len < 1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	555 return NULL;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	556 state = (gz_statep)file;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	557
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	558 /* check that we're reading and that there's no (serious) error */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	559 if (state->mode != GZ_READ \|\|
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	560 (state->err != Z_OK && state->err != Z_BUF_ERROR))
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	561 return NULL;
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 /* process a skip request */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	564 if (state->seek) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	565 state->seek = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	566 if (gz_skip(state, state->skip) == -1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	567 return NULL;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	568 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	569
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	570 /* copy output bytes up to new line or len - 1, whichever comes first --
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	571 append a terminating zero to the string (we don't check for a zero in
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	572 the contents, let the user worry about that) */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	573 str = buf;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	574 left = (unsigned)len - 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	575 if (left) do {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	576 /* assure that something is in the output buffer */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	577 if (state->x.have == 0 && gz_fetch(state) == -1)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	578 return NULL; /* error */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	579 if (state->x.have == 0) { /* end of file */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	580 state->past = 1; /* read past end */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	581 break; /* return what we have */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	582 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	583
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	584 /* look for end-of-line in current output buffer */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	585 n = state->x.have > left ? left : state->x.have;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	586 eol = (unsigned char *)memchr(state->x.next, '\n', n);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	587 if (eol != NULL)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	588 n = (unsigned)(eol - state->x.next) + 1;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	589
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	590 /* copy through end-of-line, or remainder if not found */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	591 memcpy(buf, state->x.next, n);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	592 state->x.have -= n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	593 state->x.next += n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	594 state->x.pos += n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	595 left -= n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	596 buf += n;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	597 } while (left && eol == NULL);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	598
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	599 /* return terminated string, or if nothing, end of file */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	600 if (buf == str)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	601 return NULL;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	602 buf[0] = 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	603 return str;
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 /* -- see zlib.h -- */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	607 int ZEXPORT gzdirect(file)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	608 gzFile file;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	609 {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	610 gz_statep state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	611
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	612 /* get internal structure */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	613 if (file == NULL)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	614 return 0;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	615 state = (gz_statep)file;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	616
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	617 /* if the state is not known, but we can find out, then do so (this is
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	618 mainly for right after a gzopen() or gzdopen()) */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	619 if (state->mode == GZ_READ && state->how == LOOK && state->x.have == 0)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	620 (void)gz_look(state);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	621
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	622 /* return 1 if transparent, 0 if processing a gzip stream */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	623 return state->direct;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	624 }
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 /* -- see zlib.h -- */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	627 int ZEXPORT gzclose_r(file)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	628 gzFile file;
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 int ret, err;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	631 gz_statep state;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	632
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	633 /* get internal structure */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	634 if (file == NULL)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	635 return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	636 state = (gz_statep)file;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	637
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	638 /* check that we're reading */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	639 if (state->mode != GZ_READ)
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	640 return Z_STREAM_ERROR;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	641
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	642 /* free memory and close file */
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	643 if (state->size) {
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	644 inflateEnd(&(state->strm));
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	645 free(state->out);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	646 free(state->in);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	647 }
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	648 err = state->err == Z_BUF_ERROR ? Z_BUF_ERROR : Z_OK;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	649 gz_error(state, Z_OK, NULL);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	650 free(state->path);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	651 ret = close(state->fd);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	652 free(state);
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	653 return ret ? Z_ERRNO : err;
00d788dac91a Added support for reading gzipped ROMs Michael Pavone <pavone@retrodev.com> parents: diff changeset	654 }

Mercurial > repos > blastem

annotate zlib/gzread.c @ 1971:80920c21bb52