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Add support for homebrew saves

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This commit is contained in:
Robin Jones 2023-06-08 16:24:48 +01:00
parent 8c813758f3
commit 6809203777
2 changed files with 39 additions and 16 deletions
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47
src/menu/rom_database.c
View File

@ -1,6 +1,32 @@
#include "rom_database.h"
#include <stdint.h>
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];
}
}

8
src/menu/rom_database.h
View File

@ -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 {