diff options
Diffstat (limited to 'system.c')
| -rw-r--r-- | system.c | 40 |
1 files changed, 30 insertions, 10 deletions
@@ -9,24 +9,38 @@ uint8_t safe_cmp(char *str, long offset, uint8_t *buffer, long filesize) return filesize >= offset+len && !memcmp(str, buffer + offset, len); } -system_type detect_system_type(uint8_t *rom, long filesize) +system_type detect_system_type(system_media *media) { - if (safe_cmp("SEGA", 0x100, rom, filesize)) { + if (safe_cmp("SEGA", 0x100, media->buffer, media->size)) { //TODO: Differentiate between vanilla Genesis and Sega CD/32X games return SYSTEM_GENESIS; } - if (safe_cmp("TMR SEGA", 0x1FF0, rom, filesize) - || safe_cmp("TMR SEGA", 0x3FF0, rom, filesize) - || safe_cmp("TMR SEGA", 0x7FF0, rom, filesize) + if (safe_cmp("TMR SEGA", 0x1FF0, media->buffer, media->size) + || safe_cmp("TMR SEGA", 0x3FF0, media->buffer, media->size) + || safe_cmp("TMR SEGA", 0x7FF0, media->buffer, media->size) ) { return SYSTEM_SMS; } //TODO: Detect Jaguar ROMs here + //Header based detection failed, examine filename for clues + if (media->extension) { + if (!strcmp("md", media->extension) || !strcmp("gen", media->extension)) { + return SYSTEM_GENESIS; + } + if (!strcmp("sms", media->extension)) { + return SYSTEM_SMS; + } + if (!strcmp("j64", media->extension)) { + return SYSTEM_JAGUAR; + } + } + //More certain checks failed, look for a valid 68K reset vector - if (filesize >= 8) { + if (media->size >= 8) { + char *rom = media->buffer; uint32_t reset = rom[4] << 24 | rom[5] << 16 | rom[6] << 8 | rom[7]; - if (!(reset & 1) && reset < filesize) { + if (!(reset & 1) && reset < media->size) { //we have a valid looking reset vector, assume it's a Genesis ROM return SYSTEM_GENESIS; } @@ -34,15 +48,21 @@ system_type detect_system_type(uint8_t *rom, long filesize) return SYSTEM_UNKNOWN; } -system_header *alloc_config_system(system_type stype, void *rom, uint32_t rom_size, void *lock_on, uint32_t lock_on_size, uint32_t opts, uint8_t force_region, rom_info *info_out) +system_header *alloc_config_system(system_type stype, system_media *media, uint32_t opts, uint8_t force_region, rom_info *info_out) { + void *lock_on = NULL; + uint32_t lock_on_size = 0; + if (media->chain) { + lock_on = media->chain->buffer; + lock_on_size = media->chain->size; + } switch (stype) { case SYSTEM_GENESIS: - return &(alloc_config_genesis(rom, rom_size, lock_on, lock_on_size, opts, force_region, info_out))->header; + return &(alloc_config_genesis(media->buffer, media->size, lock_on, lock_on_size, opts, force_region, info_out))->header; #ifndef NO_Z80 case SYSTEM_SMS: - return &(alloc_configure_sms(rom, rom_size, lock_on, lock_on_size, opts, force_region, info_out))->header; + return &(alloc_configure_sms(media->buffer, media->size, lock_on, lock_on_size, opts, force_region, info_out))->header; #endif default: return NULL; |