Mercurial > repos > blastem
annotate system.c @ 2457:9da3de58410d
Fix libretro build
author | Michael Pavone <pavone@retrodev.com> |
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date | Wed, 21 Feb 2024 20:25:06 -0800 |
parents | bed4d3db8a3f |
children | cb62730d5c99 |
rev | line source |
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1 #include <string.h> |
2457 | 2 #include <stdlib.h> |
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3 #include "system.h" |
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4 #include "genesis.h" |
1946 | 5 #include "gen_player.h" |
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6 #include "sms.h" |
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7 #include "mediaplayer.h" |
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8 #include "coleco.h" |
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9 #include "paths.h" |
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10 #include "util.h" |
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11 |
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12 uint8_t safe_cmp(char *str, long offset, uint8_t *buffer, long filesize) |
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13 { |
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14 long len = strlen(str); |
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15 return filesize >= offset+len && !memcmp(str, buffer + offset, len); |
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16 } |
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17 |
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18 system_type detect_system_type(system_media *media) |
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19 { |
2428 | 20 static char *pico_names[] = { |
21 "SEGA PICO", "SEGATOYS PICO", "SEGA TOYS PICO", "SAMSUNG PICO", | |
22 "SEGA IAC", "IMA IKUNOUJYUKU", "IMA IKUNOJYUKU" | |
23 }; | |
24 static const int num_pico = sizeof(pico_names)/sizeof(*pico_names); | |
25 for (int i = 0; i < num_pico; i++) { | |
26 if (safe_cmp(pico_names[i], 0x100, media->buffer, media->size)) { | |
27 return SYSTEM_PICO; | |
28 } | |
29 } | |
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30 if (safe_cmp("SEGA", 0x100, media->buffer, media->size)) { |
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31 //TODO: support other bootable identifiers |
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32 if (safe_cmp("SEGADISCSYSTEM", 0, media->buffer, media->size)) { |
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33 return SYSTEM_SEGACD; |
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34 } |
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35 //TODO: Differentiate between vanilla Genesis and 32X games |
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36 return SYSTEM_GENESIS; |
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37 } |
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38 if (safe_cmp("TMR SEGA", 0x1FF0, media->buffer, media->size) |
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39 || safe_cmp("TMR SEGA", 0x3FF0, media->buffer, media->size) |
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40 || safe_cmp("TMR SEGA", 0x7FF0, media->buffer, media->size) |
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41 ) { |
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42 return SYSTEM_SMS; |
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43 } |
1946 | 44 if (safe_cmp("BLSTEL\x02", 0, media->buffer, media->size)) { |
45 uint8_t *buffer = media->buffer; | |
46 if (media->size > 9 && buffer[7] == 0) { | |
47 return buffer[8] + 1; | |
48 } | |
49 } | |
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50 if ( |
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51 safe_cmp("Vgm ", 0, media->buffer, media->size) |
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52 || safe_cmp("RIFF", 0, media->buffer, media->size) |
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53 || safe_cmp("fLaC", 0, media->buffer, media->size)) { |
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54 return SYSTEM_MEDIA_PLAYER; |
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55 } |
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56 if ( |
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57 (safe_cmp("\xAA\x55", 0, media->buffer, media->size) |
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58 || safe_cmp("\x55\xAA", 0, media->buffer, media->size)) |
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59 && media->size > 0xB) { |
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60 uint8_t *buffer = media->buffer; |
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61 if (((buffer[0xB] << 8) | buffer[0xA]) > 0x8000) { |
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62 return SYSTEM_COLECOVISION; |
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63 } |
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64 } |
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65 |
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66 |
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67 //TODO: Detect Jaguar ROMs here |
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68 |
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69 //Header based detection failed, examine filename for clues |
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70 if (media->extension) { |
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71 if (!strcmp("md", media->extension) || !strcmp("gen", media->extension)) { |
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72 return SYSTEM_GENESIS; |
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73 } |
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74 if (!strcmp("sms", media->extension) || !strcmp("sg", media->extension) || !strcmp("gg", media->extension)) { |
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75 return SYSTEM_SMS; |
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76 } |
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77 if (!strcmp("j64", media->extension)) { |
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78 return SYSTEM_JAGUAR; |
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79 } |
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80 if (!strcmp("col", media->extension)) { |
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81 return SYSTEM_COLECOVISION; |
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82 } |
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83 } |
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84 |
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85 //More certain checks failed, look for a valid 68K reset vector |
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86 if (media->size >= 8) { |
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87 char *rom = media->buffer; |
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88 uint32_t reset = rom[5] << 16 | rom[6] << 8 | rom[7]; |
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89 if (!(reset & 1) && reset < media->size) { |
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90 //we have a valid looking reset vector, assume it's a Genesis ROM |
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91 return SYSTEM_GENESIS; |
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92 } |
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93 } |
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94 return SYSTEM_UNKNOWN; |
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95 } |
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96 |
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97 system_header *alloc_config_system(system_type stype, system_media *media, uint32_t opts, uint8_t force_region) |
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98 { |
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99 void *lock_on = NULL; |
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100 uint32_t lock_on_size = 0; |
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101 if (media->chain) { |
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102 lock_on = media->chain->buffer; |
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103 lock_on_size = media->chain->size; |
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104 } |
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105 switch (stype) |
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106 { |
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107 case SYSTEM_GENESIS: |
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108 return &(alloc_config_genesis(media->buffer, media->size, lock_on, lock_on_size, opts, force_region))->header; |
1946 | 109 case SYSTEM_GENESIS_PLAYER: |
110 return &(alloc_config_gen_player(media->buffer, media->size))->header; | |
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111 case SYSTEM_SEGACD: |
1692 | 112 return &(alloc_config_genesis_cdboot(media, opts, force_region))->header; |
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113 #ifndef NO_Z80 |
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114 case SYSTEM_SMS: |
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115 return &(alloc_configure_sms(media, opts, force_region))->header; |
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116 case SYSTEM_COLECOVISION: |
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117 return &(alloc_configure_coleco(media))->header; |
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118 #endif |
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119 case SYSTEM_MEDIA_PLAYER: |
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120 return &(alloc_media_player(media, opts))->header; |
2428 | 121 case SYSTEM_PICO: |
122 return &(alloc_config_pico(media->buffer, media->size, lock_on, lock_on_size, opts, force_region))->header; | |
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123 default: |
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124 return NULL; |
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125 } |
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126 } |
1946 | 127 |
128 system_header *alloc_config_player(system_type stype, event_reader *reader) | |
129 { | |
130 switch(stype) | |
131 { | |
132 case SYSTEM_GENESIS: | |
133 return &(alloc_config_gen_player_reader(reader))->header; | |
134 } | |
135 return NULL; | |
136 } | |
1980
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137 |
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138 void system_request_exit(system_header *system, uint8_t force_release) |
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139 { |
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140 system->force_release = force_release; |
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141 system->request_exit(system); |
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142 } |
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143 |
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144 void* load_media_subfile(const system_media *media, char *path, uint32_t *sizeout) |
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145 { |
2457 | 146 #ifdef IS_LIB |
147 //TODO: Figure out how to handle Pico artwork and similar cases in libretro builds | |
148 return NULL; | |
149 #else | |
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150 char *to_free = NULL; |
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151 void *buffer = NULL; |
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152 uint32_t size = 0; |
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153 if (media->zip) { |
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154 uint32_t i; |
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155 for (i = 0; i < media->zip->num_entries; i++) |
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156 { |
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157 if (!strcasecmp(media->zip->entries[i].name, path)) { |
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158 break; |
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159 } |
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160 } |
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161 if (i < media->zip->num_entries) { |
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162 size_t zsize = media->zip->entries[i].size + 1; |
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163 buffer = zip_read(media->zip, i, &zsize); |
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164 size = zsize; |
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165 if (buffer) { |
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166 ((uint8_t *)buffer)[size] = 0; |
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167 } |
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168 goto end; |
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169 } |
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170 } |
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171 if (!is_absolute_path(path)) { |
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172 to_free = path = path_append(media->dir, path); |
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173 } |
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174 FILE *f = fopen(path, "rb"); |
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175 if (!f) { |
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176 goto end; |
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177 } |
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178 size = file_size(f); |
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179 buffer = calloc(1, size + 1); |
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180 size = fread(buffer, 1, size, f); |
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181 fclose(f); |
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182 |
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183 end: |
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184 if (sizeout) { |
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185 *sizeout = size; |
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186 } |
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187 free(to_free); |
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188 return buffer; |
2457 | 189 #endif |
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190 } |