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Fix default target. Ensure m68k.h and z80.h are built before anything else when no dep info is available
author Michael Pavone <pavone@retrodev.com>
date Mon, 31 Mar 2025 21:06:18 -0700
parents c4256ce2c45a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1531
092675db4f37 Add support for loading ROMs from zip files
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diff changeset
1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <stddef.h>
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4 #include <string.h>
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5 #include "util.h"
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6 #include "zip.h"
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7 #ifndef DISABLE_ZLIB
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8 #include "zlib/zlib.h"
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9 #endif
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10
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11 static const char cdfd_magic[4] = {'P', 'K', 1, 2};
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12 static const char eocd_magic[4] = {'P', 'K', 5, 6};
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13 #define MIN_EOCD_SIZE 22
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14 #define MIN_CDFD_SIZE 46
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15 #define ZIP_MAX_EOCD_OFFSET (64*1024+MIN_EOCD_SIZE)
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16
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17 enum {
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18 ZIP_STORE = 0,
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19 ZIP_DEFLATE = 8
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20 };
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21
1581
7121daaa48c2 Fix drag and drop when using Nuklear UI
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parents: 1531
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22 zip_file *zip_open(const char *filename)
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23 {
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c4256ce2c45a Updated Android port using gradle toolchain and with basic Storage Access Framework support for Android 11+ support
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24 #ifdef __ANDROID__
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25 FILE *f = fopen_wrapper(filename, "rb");
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26 #else
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27 FILE *f = fopen(filename, "rb");
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28 #endif
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29 if (!f) {
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30 return NULL;
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31 }
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32 long fsize = file_size(f);
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33 if (fsize < MIN_EOCD_SIZE) {
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34 //too small to be a zip file
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35 goto fail;
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36 }
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37
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38 long max_offset = fsize > ZIP_MAX_EOCD_OFFSET ? ZIP_MAX_EOCD_OFFSET : fsize;
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39 fseek(f, -max_offset, SEEK_END);
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40 uint8_t *buf = malloc(max_offset);
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41 if (max_offset != fread(buf, 1, max_offset, f)) {
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42 goto fail;
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43 }
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44
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45 long current_offset;
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46 uint32_t cd_start, cd_size;
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47 uint16_t cd_count;
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48 for (current_offset = max_offset - MIN_EOCD_SIZE; current_offset >= 0; current_offset--)
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49 {
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50 if (memcmp(eocd_magic, buf + current_offset, sizeof(eocd_magic))) {
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51 continue;
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52 }
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53 uint16_t comment_size = buf[current_offset + 20] | buf[current_offset + 21] << 8;
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54 if (comment_size != (max_offset - current_offset - MIN_EOCD_SIZE)) {
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55 continue;
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56 }
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57 cd_start = buf[current_offset + 16] | buf[current_offset + 17] << 8
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58 | buf[current_offset + 18] << 16 | buf[current_offset + 19] << 24;
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59 if (cd_start > (fsize - (max_offset - current_offset))) {
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60 continue;
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61 }
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62 cd_size = buf[current_offset + 12] | buf[current_offset + 13] << 8
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63 | buf[current_offset + 14] << 16 | buf[current_offset + 15] << 24;
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64 if ((cd_start + cd_size) > (fsize - (max_offset - current_offset))) {
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65 continue;
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66 }
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67 cd_count = buf[current_offset + 10] | buf[current_offset + 11] << 8;
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68 break;
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69 }
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70 free(buf);
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71 if (current_offset < 0) {
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72 //failed to find EOCD
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73 goto fail;
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74 }
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75 buf = malloc(cd_size);
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76 fseek(f, cd_start, SEEK_SET);
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77 if (cd_size != fread(buf, 1, cd_size, f)) {
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78 goto fail_free;
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79 }
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80 zip_entry *entries = calloc(cd_count, sizeof(zip_entry));
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81 uint32_t cd_max_last = cd_size - MIN_CDFD_SIZE;
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82 zip_entry *cur_entry = entries;
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83 for (uint32_t off = 0; cd_count && off <= cd_max_last; cur_entry++, cd_count--)
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84 {
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85 if (memcmp(buf + off, cdfd_magic, sizeof(cdfd_magic))) {
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86 goto fail_entries;
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87 }
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88 uint32_t name_length = buf[off + 28] | buf[off + 29] << 8;
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89 uint32_t extra_length = buf[off + 30] | buf[off + 31] << 8;
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90 //TODO: verify name length doesn't go past end of CD
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91
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92 cur_entry->name = malloc(name_length + 1);
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93 memcpy(cur_entry->name, buf + off + MIN_CDFD_SIZE, name_length);
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94 cur_entry->name[name_length] = 0;
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95
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96 cur_entry->compressed_size = buf[off + 20] | buf[off + 21] << 8
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97 | buf[off + 22] << 16 | buf[off + 23] << 24;
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98 cur_entry->size = buf[off + 24] | buf[off + 25] << 8
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99 | buf[off + 26] << 16 | buf[off + 27] << 24;
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100
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101 cur_entry->local_header_off = buf[off + 42] | buf[off + 43] << 8
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102 | buf[off + 44] << 16 | buf[off + 45] << 24;
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103
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104 cur_entry->compression_method = buf[off + 10] | buf[off + 11] << 8;
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105
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106 off += name_length + extra_length + MIN_CDFD_SIZE;
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107 }
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108
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109 zip_file *z = malloc(sizeof(zip_file));
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110 z->entries = entries;
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111 z->file = f;
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112 z->num_entries = cur_entry - entries;
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0111c8344477 Fix some issues identified by asan/ubsan
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113 free(buf);
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114 return z;
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115
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116 fail_entries:
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117 for (cur_entry--; cur_entry >= entries; cur_entry--)
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118 {
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119 free(cur_entry->name);
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120 }
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121 free(entries);
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122 fail_free:
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123 free(buf);
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124 fail:
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125 fclose(f);
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126 return NULL;
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127 }
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128
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129 uint8_t *zip_read(zip_file *f, uint32_t index, size_t *out_size)
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130 {
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131
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132 fseek(f->file, f->entries[index].local_header_off + 26, SEEK_SET);
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133 uint8_t tmp[4];
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134 if (sizeof(tmp) != fread(tmp, 1, sizeof(tmp), f->file)) {
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135 return NULL;
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136 }
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137 uint32_t local_variable = (tmp[0] | tmp[1] << 8) + (tmp[2] | tmp[3] << 8);
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138 fseek(f->file, f->entries[index].local_header_off + local_variable + 30, SEEK_SET);
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139
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140 size_t int_size;
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141 if (!out_size) {
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142 out_size = &int_size;
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143 int_size = f->entries[index].size;
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144 }
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145
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146 uint8_t *buf = malloc(*out_size);
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147 if (*out_size > f->entries[index].size) {
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148 *out_size = f->entries[index].size;
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149 }
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150 switch(f->entries[index].compression_method)
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151 {
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152 case ZIP_STORE:
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153 if (*out_size != fread(buf, 1, *out_size, f->file)) {
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154 free(buf);
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155 return NULL;
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156 }
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157 break;
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158 #ifndef DISABLE_ZLIB
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159 case ZIP_DEFLATE: {
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160 //note in unzip.c in zlib/contrib suggests a dummy byte is needed, so we allocate an extra byte here
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161 uint8_t *src_buf = malloc(f->entries[index].compressed_size + 1);
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162 if (f->entries[index].compressed_size != fread(src_buf, 1, f->entries[index].compressed_size, f->file)) {
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163 free(src_buf);
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164 return NULL;
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165 }
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166 uLongf destLen = *out_size;
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167 z_stream stream;
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168 memset(&stream, 0, sizeof(stream));
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169 stream.avail_in = f->entries[index].compressed_size + 1;
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170 stream.next_in = src_buf;
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171 stream.next_out = buf;
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172 stream.avail_out = *out_size;
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173 if (Z_OK == inflateInit2(&stream, -15)) {
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174 int result = inflate(&stream, Z_FINISH);
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175 *out_size = stream.total_out;
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176 free(src_buf);
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177 inflateEnd(&stream);
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178 if (result != Z_OK && result != Z_STREAM_END && result != Z_BUF_ERROR) {
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179 free(buf);
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180 return NULL;
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181 }
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182 }
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183 break;
1594
137dbd05ceab Fix some issues identified by cppcheck
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184 }
1531
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185 #endif
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186 default:
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187 free(buf);
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188 return NULL;
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189 }
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190
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191 return buf;
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192 }
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193
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194 void zip_close(zip_file *f)
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195 {
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196 fclose(f->file);
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197 for (uint32_t i = 0; i < f->num_entries; i++)
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198 {
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199 free(f->entries[i].name);
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200 }
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201 free(f->entries);
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202 free(f);
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203 }
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204
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205