git.zerfleddert.de Git - proxmark3-svn/blob - common/crc16.c

   1 unsigned short update_crc16( unsigned short crc, unsigned char c ) {
   2         unsigned short i, v, tcrc = 0;
   3
   4         v = (crc ^ c) & 0xff;
   5   for (i = 0; i < 8; i++) {
   6       tcrc = ( (tcrc ^ v) & 1 ) ? ( tcrc >> 1 ) ^ 0x8408 : tcrc >> 1;
   7       v >>= 1;
   8   }
   9
  10   return ((crc >> 8) ^ tcrc)&0xffff;
  11 }