diff --git a/src/menu/rom_database.c b/src/menu/rom_database.c index 5a074cd0..1671eeea 100644 --- a/src/menu/rom_database.c +++ b/src/menu/rom_database.c @@ -1,6 +1,32 @@ #include "rom_database.h" #include +uint8_t extract_homebrew_setting(uint8_t setting, uint8_t bit_position) { + return (setting & (1 << bit_position)) ? 1 : 0; +} + +uint8_t extract_homebrew_save_type(uint8_t save_type) { + switch (save_type) { + case 0x00: + return DB_SAVE_TYPE_NONE; + case 0x01: + return DB_SAVE_TYPE_EEPROM_4K; + case 0x02: + return DB_SAVE_TYPE_EEPROM_16K; + case 0x03: + return DB_SAVE_TYPE_SRAM; + case 0x04: + return DB_SAVE_TYPE_SRAM_BANKED; + case 0x05: + return DB_SAVE_TYPE_FLASHRAM; + case 0x06: + return DB_SAVE_TYPE_SRAM_128K; + default: + return DB_SAVE_TYPE_CART_SPECIFIED; // Invalid save type, handle accordingly + } +} + + // TODO: make sure this can also handle an external input file. uint8_t rom_db_match_save_type(rom_header_t rom_header) { @@ -10,8 +36,14 @@ uint8_t rom_db_match_save_type(rom_header_t rom_header) { // First: Match by the `ED` Developer ID // TODO: if appropriate this can be improved with other unused codes... e.g. | `AA` | `ZZ` if (rom_header.metadata.unique_identifier == *(uint16_t *)"ED") { - // FIXME: should probably just return the specified save type. - return DB_SAVE_TYPE_CART_SPECIFIED; + + // uint8_t info = rom_header.version & 0x0F; + // uint8_t rtc_enabled = extract_homebrew_setting(info, 0); // Bit 0 + // uint8_t region_free_enabled = extract_homebrew_setting(info, 1); // Bit 1 + + uint8_t save_type = (rom_header.version >> 4) & 0x0F; + + return extract_homebrew_save_type(save_type); } // Second: Match the default entries for crc_high. @@ -83,16 +115,7 @@ uint8_t rom_db_match_save_type(rom_header_t rom_header) { for (int i = 0; save_types[i] != 0xff; i++) { if (rom_header.metadata.unique_identifier == *(uint16_t *) cart_ids[i]) { - i = save_types[i]; - // i = i == 1 ? DB_SAVE_TYPE_EEPROM_4K : - // i == 2 ? DB_SAVE_TYPE_EEPROM_16K : - // i == 3 ? DB_SAVE_TYPE_SRAM : - // i == 4 ? DB_SAVE_TYPE_SRAM_BANKED : - // i == 5 ? DB_SAVE_TYPE_SRAM_128K : - // i == 6 ? DB_SAVE_TYPE_FLASHRAM : - // // i == 15 ? DB_SAVE_TYPE_CART_SPECIFIED : - // DB_SAVE_TYPE_NONE; - return i; + return save_types[i]; } } diff --git a/src/menu/rom_database.h b/src/menu/rom_database.h index 5c52e19b..9fc70977 100644 --- a/src/menu/rom_database.h +++ b/src/menu/rom_database.h @@ -9,12 +9,12 @@ #define DB_SAVE_TYPE_SRAM_BANKED 0x04 #define DB_SAVE_TYPE_SRAM_128K 0x05 #define DB_SAVE_TYPE_FLASHRAM 0x06 -#define DB_SAVE_TYPE_CART_SPECIFIED 0x0f +#define DB_SAVE_TYPE_CART_SPECIFIED 0xff //Rom Info // CheckCode 0x10, 8 bytes (sometimes refered to as CRC Hi and CRC Lo) -// GameTitle 0x20, 14 bytes +// GameTitle 0x20, 20 bytes // GameCode -> // CategoryCode 0x3b // UniqueCode 0x3c and 0x3d @@ -27,7 +27,7 @@ // N64_CART_EXPANDABLE = 'C', // N64_DISK_EXPANDABLE = 'E', // N64_ALECK64 = 'Z', -// //UNKNOWN = NULL +// //TYPE_UNKNOWN = '\0' // } rom_media_type_t; // typedef enum { @@ -57,7 +57,7 @@ // MARKET_EUROPE_X = 'X', // MARKET_EUROPE_Y = 'Y', // MARKET_EUROPE_Z = 'Z', -// //MARKET_UNKNOWN = NULL +// //MARKET_UNKNOWN = '\0' // } rom_destination_market_t; typedef struct {