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fixed detection of nes games

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This commit is contained in:
Andre Leiradella 2015-11-03 10:06:03 -02:00
parent 7dc68443d6
commit a1b8c566dc
1 changed files with 100 additions and 1 deletions
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101
cheevos.c
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@ -1505,6 +1505,19 @@ static int cheevos_deactivate_unlocks(unsigned game_id, retro_time_t *timeout)
#define CHEEVOS_SIX_MB (6 * 1024 * 1024)
#define CHEEVOS_EIGHT_MB (8 * 1024 * 1024)
static INLINE unsigned next_power_of_2(unsigned n)
{
n--;
n |= n >> 1;
n |= n >> 2;
n |= n >> 4;
n |= n >> 8;
n |= n >> 16;
return n + 1;
}
static size_t cheevos_eval_md5(const struct retro_game_info *info, MD5_CTX *ctx)
{
MD5_Init(ctx);
@ -1624,7 +1637,93 @@ static unsigned cheevos_find_game_id_genesis(const struct retro_game_info *info,
static unsigned cheevos_find_game_id_nes(const struct retro_game_info *info, retro_time_t timeout)
{
return 0;
struct
{
uint8_t id[4]; /* NES^Z */
uint8_t rom_size;
uint8_t vrom_size;
uint8_t rom_type;
uint8_t rom_type2;
uint8_t reserve[8];
} header;
size_t rom_size;
MD5_CTX ctx;
uint8_t hash[16];
retro_time_t to;
if (info->data)
{
if (info->size < sizeof(header))
return 0;
memcpy((void*)&header, info->data, sizeof(header));
}
else
{
RFILE *file = retro_fopen(info->path, RFILE_MODE_READ, 0);
ssize_t num_read;
if (!file)
return 0;
num_read = retro_fread(file, (void*)&header, sizeof(header));
retro_fclose(file);
if (num_read < sizeof(header))
return 0;
}
if (header.id[0] != 'N' || header.id[1] != 'E' || header.id[2] != 'S' || header.id[3] != 0x1a)
return 0;
if (header.rom_size)
rom_size = next_power_of_2(header.rom_size) * 16384;
else
rom_size = 4194304;
if (info->data)
{
if (rom_size + sizeof(header) > info->size)
return 0;
MD5_Init(&ctx);
MD5_Update(&ctx, (void*)((char*)info->data + sizeof(header)), rom_size);
MD5_Final(hash, &ctx);
}
else
{
RFILE *file = retro_fopen(info->path, RFILE_MODE_READ, 0);
if (!file)
return 0;
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 >= rom_size)
{
MD5_Update(&ctx, (void*)buffer, rom_size);
break;
}
MD5_Update(&ctx, (void*)buffer, num_read);
rom_size -= num_read;
}
retro_fclose(file);
}
to = timeout;
return cheevos_get_game_id(hash, &to);
}
int cheevos_load(const struct retro_game_info *info)