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cart header loading

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This commit is contained in:
Samuel Walker 2025-01-30 14:59:19 -07:00
parent 7e0b305d17
commit 705be02543
Signed by: piwalker
GPG Key ID: BE1F84BF85111255
1 changed files with 168 additions and 2 deletions
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172
lib/cart.c
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@ -1,6 +1,172 @@
#include <cart.h>
bool cart_load(char *cart) {
printf("Cart loading not implemented yet\n");
return false;
typedef struct {
char filename[1024];
u32 rom_size;
u8 *rom_data;
rom_header *header;
} cert_context;
static cert_context ctx;
static const char *ROM_TYPES[] = {
"ROM ONLY",
"MBC1",
"MBC1+RAM",
"MBC1+RAM+BATTERY",
"0X04 ???",
"MBC2",
"MBC2+BATTERY",
"0X07 ???",
"ROM+RAM 1",
"ROM+RAM+BATTERY 1",
"0X0A ???",
"MMM01",
"MMM01+RAM",
"MMM01+RAM+BATTERY",
"0X0E ???",
"MBC3+TIMER+BATTERY",
"MBC3+TIMER+RAM+BATTERY 2",
"MBC3",
"MBC3+RAM 2",
"MBC3+RAM+BATTERY 2",
"0X14 ???",
"0X15 ???",
"0X16 ???",
"0X17 ???",
"0X18 ???",
"MBC5",
"MBC5+RAM",
"MBC5+RAM+BATTERY",
"MBC5+RUMBLE",
"MBC5+RUMBLE+RAM",
"MBC5+RUMBLE+RAM+BATTERY",
"0X1F ???",
"MBC6",
"0X21 ???",
"MBC7+SENSOR+RUMBLE+RAM+BATTERY "
};
static const char *LIC_CODE[0xA5] = {
[0x00] = "None",
[0x01] = "Nintendo R&D1",
[0x08] = "Capcom",
[0x13] = "Electronic Arts",
[0x18] = "Hudson Soft",
[0x19] = "b-ai",
[0x20] = "kss",
[0x22] = "pow",
[0x24] = "PCM Complete",
[0x25] = "san-x",
[0x28] = "Kemco Japan",
[0x29] = "seta",
[0x30] = "Viacom",
[0x31] = "Nintendo",
[0x32] = "Bandai",
[0x33] = "Ocean/Acclaim",
[0x34] = "Konami",
[0x35] = "Hector",
[0x37] = "Taito",
[0x38] = "Hudson",
[0x39] = "Banpresto",
[0x41] = "Ubi Soft",
[0x42] = "Atlus",
[0x44] = "Malibu",
[0x46] = "angel",
[0x47] = "Bullet-Proof",
[0x49] = "irem",
[0x50] = "Absolute",
[0x51] = "Acclaim",
[0x52] = "Activision",
[0x53] = "American sammy",
[0x54] = "Konami",
[0x55] = "Hi tech entertainment",
[0x56] = "LJN",
[0x57] = "Matchbox",
[0x58] = "Mattel",
[0x59] = "Milton Bradley",
[0x60] = "Titus",
[0x61] = "Virgin",
[0x64] = "LucasArts",
[0x67] = "Ocean",
[0x69] = "Electronic Arts",
[0x70] = "Infogrames",
[0x71] = "Interplay",
[0x72] = "Broderbund",
[0x73] = "sculptured",
[0x75] = "sci",
[0x78] = "THQ",
[0x79] = "Accolade",
[0x80] = "misawa",
[0x83] = "lozc",
[0x86] = "Tokuma Shoten Intermedia",
[0x87] = "Tsukuda Original",
[0x91] = "Chunsoft",
[0x92] = "Video system",
[0x93] = "Ocean/Acclaim",
[0x95] = "Varie",
[0x96] = "Yonezawa/s’pal",
[0x97] = "Kaneko",
[0x99] = "Pack in soft",
[0xA4] = "Konami (Yu-Gi-Oh!)"
};
const char *cart_type_name() {
if(ctx.header->type <= 0x22) {
return ROM_TYPES[ctx.header->type];
}
return "UNKNOWN";
}
const char *cart_lic_name() {
if(ctx.header->new_lic_code <= 0xA4) {
return LIC_CODE[ctx.header->lic_code];
}
return "UNKNOWN";
}
bool cart_load(char *cart) {
snprintf(ctx.filename, sizeof(ctx.filename), "%s", cart);
FILE *fp = fopen(cart, "r");
if (!fp) {
printf("Failed to open: %s\n", cart);
return false;
}
printf("Opened: %s\n", cart),
fseek(fp, 0, SEEK_END);
ctx.rom_size = ftell(fp);
rewind(fp);
ctx.rom_data = malloc(ctx.rom_size);
fread(ctx.rom_data, ctx.rom_size, 1, fp);
fclose(fp);
ctx.header = (rom_header *)(ctx.rom_data + 0x100);
ctx.header->title[15] = 0;
printf("Cartridge Loaded:\n");
printf("\t Title : %s\n", ctx.header->title);
printf("\t Type : %2.2X (%s)\n", ctx.header->type, cart_type_name());
printf("\t ROM Size : %d KB\n", 32 << ctx.header->rom_size);
printf("\t RAM Size : %2.2X\n", ctx.header->ram_size);
printf("\t LIC Code : %2.2X (%s)\n", ctx.header->lic_code, cart_lic_name());
printf("\t ROM Vers : %2.2X\n", ctx.header->version);
u16 x = 0;
for (u16 i=0X0134; i<=0X014C; i++) {
x = x - ctx.rom_data[i] -1;
}
printf("\t Checksum : %2.2X (%s)\n", ctx.header->checksum, (x & 0xFF) == ctx.header->checksum ? "PASSED" : "Failed");
if((x & 0xFF) != ctx.header->checksum) {
fprintf(stderr, "WARNING!!! The header checksum does not match! ROM may be corrupt or invalid!\n");
}
return true;
}