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leaving the old crc in, commented out

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Wolfgang (Blub) Bumiller 2012-10-02 17:54:19 +02:00
parent 5dd8e23dfd
commit 4f0d573275
1 changed files with 16 additions and 5 deletions
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21
util.c
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@ -334,18 +334,29 @@ static const uint16_t util_crc16_table[] = {
/* /*
* Implements a CRC function for X worth bits using (uint[X]_t) * Implements a CRC function for X worth bits using (uint[X]_t)
* as type. and util_crc[X]_table. * as type. and util_crc[X]_table.
* Streamable QCC compatible CRC functions.
* Quake expects a non-reflective CRC.
*/ */
#define CRC(X) \ #define CRC(X) \
uint##X##_t util_crc##X(uint##X##_t current, const char *k, size_t len) { \ uint##X##_t util_crc##X(const char *k, int len, const short clamp) { \
register uint##X##_t h= current; \ register uint##X##_t h= (uint##X##_t)0xFFFFFFFF; \
for (; len; --len, ++k) \ for (; len; --len, ++k) \
h = util_crc##X##_table[(h>>8)^((unsigned char)*k)]^(h<<8); \ h = util_crc##X##_table[(h^((unsigned char)*k))&0xFF]^(h>>8); \
return h; \ return (~h)%clamp; \
} }
CRC(32) CRC(32)
CRC(16) CRC(16)
#undef CRC #undef CRC
/*
#define CRC(X) \
uint##X##_t util_crc##X(const char *k, int len, const short clamp) { \
register uint##X##_t h= (uint##X##_t)0xFFFFFFFF; \
for (; len; --len, ++k) \
h = util_crc##X##_table[(h^((unsigned char)*k))&0xFF]^(h>>8); \
return (~h)%clamp; \
}
*/
/* /*
* Implements libc getline for systems that don't have it, which is * Implements libc getline for systems that don't have it, which is