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Add the actual crc implementation

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Wolfgang (Blub) Bumiller 2012-10-02 17:56:59 +02:00
parent 4f0d573275
commit c024cbaaa0
1 changed files with 4 additions and 4 deletions
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8
util.c
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@ -338,11 +338,11 @@ static const uint16_t util_crc16_table[] = {
* Quake expects a non-reflective 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; \
uint##X##_t util_crc##X(uint##X##_t current, const char *k, size_t len) { \
register uint##X##_t h= current; \
for (; len; --len, ++k) \
h = util_crc##X##_table[(h^((unsigned char)*k))&0xFF]^(h>>8); \
return (~h)%clamp; \
h = util_crc##X##_table[(h>>8)^((unsigned char)*k)]^(h<<8); \
return h; \
}
CRC(32)
CRC(16)