libomfs/crc.c

   1
   2 #include "config.h"
   3 #include "crc.h"
   4
   5 /* crc-ccitt but with msb first */
   6 u16 crc_ccitt_msb(u16 crc, unsigned char *buf, int count)
   7 {
   8     int i, j;
   9     for (i=0; i<count; i++)
  10     {
  11         crc ^= buf[i] << 8;
  12         for (j = 0; j < 8; j++)
  13             crc = (crc << 1) ^ ((crc & 0x8000) ? POLY : 0);
  14     }
  15     return crc;
  16 }