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Merge pull request #7201 from rzumer/master

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Support headerless NES hashing in cheevos.c
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Twinaphex 2018-09-10 06:33:54 +02:00 committed by GitHub
commit 523ee65125
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1 changed files with 56 additions and 24 deletions
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80
cheevos/cheevos.c
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@ -3001,16 +3001,11 @@ found:
memcpy((void*)&coro->header, coro->data,
sizeof(coro->header));
if ( coro->header.id[0] != 'N'
|| coro->header.id[1] != 'E'
|| coro->header.id[2] != 'S'
|| coro->header.id[3] != 0x1a)
{
coro->gameid = 0;
CORO_RET();
}
if (coro->header.id[0] == 'N'
&& coro->header.id[1] == 'E'
&& coro->header.id[2] == 'S'
&& coro->header.id[3] == 0x1a)
{
size_t romsize = 256;
/* from FCEU core - compute size using the cart mapper */
@ -3026,24 +3021,61 @@ found:
* we use FCEU_read. */
coro->round = mapper != 53 && mapper != 198 && mapper != 228;
coro->bytes = coro->round ? romsize : coro->header.rom_size;
}
/* from FCEU core - check if Trainer included in ROM data */
MD5_Init(&coro->md5);
coro->offset = sizeof(coro->header) + (coro->header.rom_type & 4
coro->offset = sizeof(coro->header) + (coro->header.rom_type & 4
? sizeof(coro->header) : 0);
coro->count = 0x4000 * coro->bytes;
CORO_GOSUB(EVAL_MD5);
/* from FCEU core - check if Trainer included in ROM data */
MD5_Init(&coro->md5);
coro->count = 0x4000 * coro->bytes;
CORO_GOSUB(EVAL_MD5);
if (coro->count < 0x4000 * coro->bytes)
{
coro->offset = 0xff;
coro->count = 0x4000 * coro->bytes - coro->count;
CORO_GOSUB(FILL_MD5);
if (coro->count < 0x4000 * coro->bytes)
{
coro->offset = 0xff;
coro->count = 0x4000 * coro->bytes - coro->count;
CORO_GOSUB(FILL_MD5);
}
MD5_Final(coro->hash, &coro->md5);
CORO_GOTO(GET_GAMEID);
}
else
{
// Fall back to headerless hashing
// PRG ROM size is unknown, so test by 16KB chunks
size_t chunks = coro->len >> 14;
size_t chunk_size = 0x4000;
coro->round = 0;
coro->offset = 0;
for (int i = 0; i < chunks; i++)
{
MD5_Init(&coro->md5);
coro->bytes = i + 1;
coro->count = coro->bytes * chunk_size;
CORO_GOSUB(EVAL_MD5);
MD5_Final(coro->hash, &coro->md5);
CORO_GOTO(GET_GAMEID);
if (coro->count < 0x4000 * coro->bytes)
{
coro->offset = 0xff;
coro->count = 0x4000 * coro->bytes - coro->count;
CORO_GOSUB(FILL_MD5);
}
MD5_Final(coro->hash, &coro->md5);
CORO_GOSUB(GET_GAMEID);
if (coro->gameid > 0)
{
break;
}
}
CORO_RET();
}
/**************************************************************************
* Info Tries to identify a "generic" game