repos/blastem: zip.c annotate

annotate zip.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	137dbd05ceab
children	0111c8344477

rev	line source
1531 092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	1 #include <stdio.h>
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	2 #include <stdlib.h>
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	3 #include <stddef.h>
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	4 #include <string.h>
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	5 #include "util.h"
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	6 #include "zip.h"
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	7 #ifndef DISABLE_ZLIB
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	8 #include "zlib/zlib.h"
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	9 #endif
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	10
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	11 static const char cdfd_magic[4] = {'P', 'K', 1, 2};
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	12 static const char eocd_magic[4] = {'P', 'K', 5, 6};
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	13 #define MIN_EOCD_SIZE 22
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	14 #define MIN_CDFD_SIZE 46
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	15 #define ZIP_MAX_EOCD_OFFSET (64*1024+MIN_EOCD_SIZE)
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	16
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	17 enum {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	18 ZIP_STORE = 0,
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	19 ZIP_DEFLATE = 8
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	20 };
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	21
1581 7121daaa48c2 Fix drag and drop when using Nuklear UI Michael Pavone <pavone@retrodev.com> parents: 1531 diff changeset	22 zip_file zip_open(const char filename)
1531 092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	23 {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	24 FILE *f = fopen(filename, "rb");
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	25 if (!f) {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	26 return NULL;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	27 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	28 long fsize = file_size(f);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	29 if (fsize < MIN_EOCD_SIZE) {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	30 //too small to be a zip file
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	31 goto fail;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	32 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	33
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	34 long max_offset = fsize > ZIP_MAX_EOCD_OFFSET ? ZIP_MAX_EOCD_OFFSET : fsize;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	35 fseek(f, -max_offset, SEEK_END);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	36 uint8_t *buf = malloc(max_offset);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	37 if (max_offset != fread(buf, 1, max_offset, f)) {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	38 goto fail;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	39 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	40
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	41 long current_offset;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	42 uint32_t cd_start, cd_size;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	43 uint16_t cd_count;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	44 for (current_offset = max_offset - MIN_EOCD_SIZE; current_offset >= 0; current_offset--)
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	45 {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	46 if (memcmp(eocd_magic, buf + current_offset, sizeof(eocd_magic))) {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	47 continue;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	48 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	49 uint16_t comment_size = buf[current_offset + 20] \| buf[current_offset + 21] << 8;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	50 if (comment_size != (max_offset - current_offset - MIN_EOCD_SIZE)) {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	51 continue;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	52 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	53 cd_start = buf[current_offset + 16] \| buf[current_offset + 17] << 8
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	54 \| buf[current_offset + 18] << 16 \| buf[current_offset + 19] << 24;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	55 if (cd_start > (fsize - (max_offset - current_offset))) {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	56 continue;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	57 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	58 cd_size = buf[current_offset + 12] \| buf[current_offset + 13] << 8
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	59 \| buf[current_offset + 14] << 16 \| buf[current_offset + 15] << 24;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	60 if ((cd_start + cd_size) > (fsize - (max_offset - current_offset))) {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	61 continue;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	62 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	63 cd_count = buf[current_offset + 10] \| buf[current_offset + 11] << 8;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	64 break;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	65 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	66 free(buf);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	67 if (current_offset < 0) {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	68 //failed to find EOCD
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	69 goto fail;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	70 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	71 buf = malloc(cd_size);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	72 fseek(f, cd_start, SEEK_SET);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	73 if (cd_size != fread(buf, 1, cd_size, f)) {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	74 goto fail_free;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	75 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	76 zip_entry *entries = calloc(cd_count, sizeof(zip_entry));
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	77 uint32_t cd_max_last = cd_size - MIN_CDFD_SIZE;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	78 zip_entry *cur_entry = entries;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	79 for (uint32_t off = 0; cd_count && off <= cd_max_last; cur_entry++, cd_count--)
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	80 {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	81 if (memcmp(buf + off, cdfd_magic, sizeof(cdfd_magic))) {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	82 goto fail_entries;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	83 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	84 uint32_t name_length = buf[off + 28] \| buf[off + 29] << 8;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	85 uint32_t extra_length = buf[off + 30] \| buf[off + 31] << 8;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	86 //TODO: verify name length doesn't go past end of CD
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	87
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	88 cur_entry->name = malloc(name_length + 1);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	89 memcpy(cur_entry->name, buf + off + MIN_CDFD_SIZE, name_length);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	90 cur_entry->name[name_length] = 0;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	91
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	92 cur_entry->compressed_size = buf[off + 20] \| buf[off + 21] << 8
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	93 \| buf[off + 22] << 16 \| buf[off + 23] << 24;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	94 cur_entry->size = buf[off + 24] \| buf[off + 25] << 8
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	95 \| buf[off + 26] << 16 \| buf[off + 27] << 24;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	96
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	97 cur_entry->local_header_off = buf[off + 42] \| buf[off + 43] << 8
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	98 \| buf[off + 44] << 16 \| buf[off + 45] << 24;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	99
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	100 cur_entry->compression_method = buf[off + 10] \| buf[off + 11] << 8;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	101
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	102 off += name_length + extra_length + MIN_CDFD_SIZE;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	103 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	104
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	105 zip_file *z = malloc(sizeof(zip_file));
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	106 z->entries = entries;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	107 z->file = f;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	108 z->num_entries = cur_entry - entries;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	109 return z;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	110
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	111 fail_entries:
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	112 for (cur_entry--; cur_entry >= entries; cur_entry--)
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	113 {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	114 free(cur_entry->name);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	115 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	116 free(entries);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	117 fail_free:
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	118 free(buf);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	119 fail:
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	120 fclose(f);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	121 return NULL;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	122 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	123
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	124 uint8_t zip_read(zip_file f, uint32_t index, size_t *out_size)
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	125 {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	126
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	127 fseek(f->file, f->entries[index].local_header_off + 26, SEEK_SET);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	128 uint8_t tmp[4];
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	129 if (sizeof(tmp) != fread(tmp, 1, sizeof(tmp), f->file)) {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	130 return NULL;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	131 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	132 uint32_t local_variable = (tmp[0] \| tmp[1] << 8) + (tmp[2] \| tmp[3] << 8);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	133 fseek(f->file, f->entries[index].local_header_off + local_variable + 30, SEEK_SET);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	134
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	135 size_t int_size;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	136 if (!out_size) {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	137 out_size = &int_size;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	138 int_size = f->entries[index].size;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	139 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	140
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	141 uint8_t buf = malloc(out_size);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	142 if (*out_size > f->entries[index].size) {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	143 *out_size = f->entries[index].size;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	144 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	145 switch(f->entries[index].compression_method)
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	146 {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	147 case ZIP_STORE:
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	148 if (out_size != fread(buf, 1, out_size, f->file)) {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	149 free(buf);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	150 return NULL;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	151 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	152 break;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	153 #ifndef DISABLE_ZLIB
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	154 case ZIP_DEFLATE: {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	155 //note in unzip.c in zlib/contrib suggests a dummy byte is needed, so we allocate an extra byte here
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	156 uint8_t *src_buf = malloc(f->entries[index].compressed_size + 1);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	157 if (f->entries[index].compressed_size != fread(src_buf, 1, f->entries[index].compressed_size, f->file)) {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	158 free(src_buf);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	159 return NULL;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	160 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	161 uLongf destLen = *out_size;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	162 z_stream stream;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	163 memset(&stream, 0, sizeof(stream));
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	164 stream.avail_in = f->entries[index].compressed_size + 1;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	165 stream.next_in = src_buf;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	166 stream.next_out = buf;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	167 stream.avail_out = *out_size;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	168 if (Z_OK == inflateInit2(&stream, -15)) {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	169 int result = inflate(&stream, Z_FINISH);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	170 *out_size = stream.total_out;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	171 free(src_buf);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	172 inflateEnd(&stream);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	173 if (result != Z_OK && result != Z_STREAM_END && result != Z_BUF_ERROR) {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	174 free(buf);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	175 return NULL;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	176 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	177 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	178 break;
1594 137dbd05ceab Fix some issues identified by cppcheck Michael Pavone <pavone@retrodev.com> parents: 1581 diff changeset	179 }
1531 092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	180 #endif
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	181 default:
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	182 free(buf);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	183 return NULL;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	184 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	185
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	186 return buf;
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	187 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	188
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	189 void zip_close(zip_file *f)
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	190 {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	191 fclose(f->file);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	192 for (uint32_t i = 0; i < f->num_entries; i++)
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	193 {
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	194 free(f->entries[i].name);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	195 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	196 free(f->entries);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	197 free(f);
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	198 }
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	199
092675db4f37 Add support for loading ROMs from zip files Michael Pavone <pavone@retrodev.com> parents: diff changeset	200

Mercurial > repos > blastem

annotate zip.c @ 1971:80920c21bb52