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/* ------------------------------------------------------------------------ */
/* */
/* CRC-calculation routines. */
/* */
/* ------------------------------------------------------------------------ */
/* ML - 01/2004: changed licence to GPL */
/* ------------------------------------------------------------------------ */
#include "uac_crc.h"
ULONG crctable[256];
ULONG rd_crc=0;
void make_crctable(void) // initializes CRC table
{
ULONG r,
i,
j;
for (i = 0; i <= 255; i++)
{
for (r = i, j = 8; j; j--)
r = (r & 1) ? (r >> 1) ^ CRCPOLY : (r >> 1);
crctable[i] = r;
}
}
// Updates crc from addr till addr+len-1
//
ULONG getcrc(ULONG crc, UCHAR * addr, INT len)
{
while (len--)
crc = crctable[(unsigned char) crc ^ (*addr++)] ^ (crc >> 8);
return (crc);
}
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