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cheevo - fixed md5 nes compute to fix unresolved game_id request.

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This commit is contained in:
David Skywalker 2016-03-11 21:26:07 +01:00
parent ca480ef459
commit d62d80c1ce
1 changed files with 41 additions and 23 deletions
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64
cheevos.c
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@ -1845,9 +1845,9 @@ static unsigned cheevos_find_game_id_nes(
return 0;
if (header.rom_size)
rom_size = cheevos_next_power_of_2(header.rom_size) * 16384;
rom_size = cheevos_next_power_of_2(header.rom_size);
else
rom_size = 4194304;
rom_size = 256;
if (info->data)
{
@ -1862,33 +1862,51 @@ static unsigned cheevos_find_game_id_nes(
else
{
RFILE *file = retro_fopen(info->path, RFILE_MODE_READ, 0);
uint8_t * data = (uint8_t *) malloc(rom_size << 14);
if (!file)
if (!file || !data)
return 0;
/* from fceu core - need it for a correctly md5 sum */
memset(data, 0xFF, rom_size << 14);
/* from fceu core - compute size using the cart mapper */
int MapperNo = (header.rom_type >> 4);
MapperNo |= (header.rom_type2 & 0xF0);
int not_power2[] =
{
53, 198, 228
};
bool round = true;
for (int i = 0; i != sizeof(not_power2) / sizeof(not_power2[0]); ++i) {
//for games not to the power of 2, so we just read enough
//prg rom from it, but we have to keep ROM_size to the power of 2
//since PRGCartMapping wants ROM_size to be to the power of 2
//so instead if not to power of 2, we just use head.ROM_size when
//we use FCEU_read
if (not_power2[i] == MapperNo) {
round = false;
break;
}
}
MD5_Init(&ctx);
retro_fseek(file, sizeof(header), SEEK_SET);
for (;;)
{
uint8_t buffer[4096];
ssize_t num_read = retro_fread(file,
(void*)buffer, sizeof(buffer));
if (num_read <= 0)
break;
if (num_read >= (ssize_t)rom_size)
{
MD5_Update(&ctx, (void*)buffer, rom_size);
break;
}
MD5_Update(&ctx, (void*)buffer, num_read);
rom_size -= num_read;
}
/* from fceu core - check if Trainer included in ROM data */
if (header.rom_type & 4)
retro_fseek(file, sizeof(header), SEEK_CUR);
unsigned bytes = (round) ? rom_size : header.rom_size;
ssize_t num_read = retro_fread(file, (void*) data, 0x4000 * bytes );
retro_fclose(file);
if (num_read <= 0)
return 0;
MD5_Update(&ctx, (void*) data, rom_size << 14);
MD5_Final(hash, &ctx);
}
to = timeout;