32 lines
588 B
C
32 lines
588 B
C
|
#ifndef __crc32_h
|
||
|
|
#define __crc32_h
|
||
|
|
|
||
|
|
/* crc32.h */
|
||
|
|
|
||
|
|
/* wrapper for gall library */
|
||
|
|
|
||
|
|
typedef unsigned long crc32_t;
|
||
|
|
#define Z_NULL 0
|
||
|
|
|
||
|
|
#define byte(a) ((unsigned char)(a))
|
||
|
|
|
||
|
|
extern crc32_t __crc32_table[256];
|
||
|
|
|
||
|
|
static crc32_t updCrc32(unsigned char ch, crc32_t crc)
|
||
|
|
{
|
||
|
|
return (crc32_t)(__crc32_table[byte(crc) ^ byte(ch)] ^ (crc >> 8));
|
||
|
|
}
|
||
|
|
|
||
|
|
static crc32_t crc32(crc32_t crc, const unsigned char *buf, unsigned int len)
|
||
|
|
{
|
||
|
|
if (buf == Z_NULL) return 0L;
|
||
|
|
crc = crc ^ 0xffffffffL;
|
||
|
|
while (len--)
|
||
|
|
{
|
||
|
|
crc = updCrc32(*buf++, crc);
|
||
|
|
}
|
||
|
|
return crc ^ 0xffffffffL;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* __crc32_h */
|