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main.c
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main.c
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#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#define KEY_FR_VALUE 0x6325 // 0x2563 byteswapped.
#define MAGIC_TOTAL 5
#define MAGIC_LEN 12
const char ROM_MAGIC[MAGIC_TOTAL][MAGIC_LEN] =
{
"POKEMON P",
"POKEMON D",
"POKEMON PL",
"POKEMON HG",
"POKEMON SS",
};
int32_t ROM_OFFSETS[] =
{
0x4DB0, // DIAMOND
0x4DB0, // PEAL
0x4DF8, // PLAT
0x4E28, // HG
0x4E28, // SS
};
int32_t get_offset(FILE* fp)
{
if (!fp) return -1;
char magic[MAGIC_LEN] = { 0 };
fseek(fp, 0, SEEK_SET);
if (!fread(magic, MAGIC_LEN, 1, fp))
{
printf("FAILED TO READ FILE\n\n");
return -1;
}
for (uint8_t i = 0; i < MAGIC_TOTAL; i++)
{
if (strcmp(magic, ROM_MAGIC[i]) == 0)
{
printf("FOUND GAME: %s\n\n", ROM_MAGIC[i]);
printf("OFFSET: 0x%X\n\n", ROM_OFFSETS[i]);
return ROM_OFFSETS[i];
}
}
printf("FAILED TO FIND MAGIC\n\n");
return -1;
}
int change_frame_rate(FILE* fp, int32_t offset)
{
if (!fp || !offset) return -1;
uint16_t cur_value = 0;
fseek(fp, offset, SEEK_SET);
if (!fread(&cur_value, 2, 1, fp))
{
printf("FAILED TO READ FILE\n\n");
return -1;
}
if (cur_value != 0 && cur_value != KEY_FR_VALUE)
{
printf("UNKOWN CURRENT VALUE: 0x%X\n\n", cur_value);
return -1;
}
printf("%s\n\n", cur_value ? "REMOVING FRAMERATE CAP" : "ENABLEING FRAMERATE CAP");
uint16_t value = cur_value ? 0000 : KEY_FR_VALUE;
fseek(fp, offset, SEEK_SET);
if (!fwrite(&value, 2, 1, fp))
{
printf("FAILED TO WRITE FILE\n\n");
return -1;
}
return 0;
}
int main(int argc, char* argv[])
{
printf("\nWELCOME!\n\n");
if (argc != 2)
{
printf("\nUSAGE: romname\n\n");
printf("EXAMPLE: pokemon_diamond.rom\n\n");
return -1;
}
FILE* fp = fopen(argv[1], "rb+");
if (!fp)
{
printf("FAILED TO OPEN FILE %s\n\n", argv[1]);
return -1;
}
int32_t offset = get_offset(fp);
if (offset == -1)
{
fclose(fp);
return -1;
}
if (change_frame_rate(fp, offset) == -1)
{
fclose(fp);
return -1;
}
printf("DONE!\n\n");
fclose(fp);
return 0;
}