proxmark3/common/crc16.c

unsigned short update_crc16( unsigned short crc, unsigned char c ) {
	unsigned short i, v, tcrc = 0;

	v = (crc ^ c) & 0xff;
  for (i = 0; i < 8; i++) {
      tcrc = ( (tcrc ^ v) & 1 ) ? ( tcrc >> 1 ) ^ 0x8408 : tcrc >> 1;
      v >>= 1;
  }

  return ((crc >> 8) ^ tcrc)&0xffff;
}
There's no painless way to do this, but it needs to be done -- the only reason any of the Windows code was in CPP files was because the MS compiler doesn't support C99. Switch to using MinGW, and that problem goes away, so we can rename the files back. 2009-12-22 20:42:54 +08:00			`unsigned short update_crc16( unsigned short crc, unsigned char c ) {`
			`unsigned short i, v, tcrc = 0;`
Further additions to tidemod to differentiate between ro and rw tags and check crc validity. 2009-07-22 19:39:39 +08:00
			`v = (crc ^ c) & 0xff;`
			`for (i = 0; i < 8; i++) {`
			`tcrc = ( (tcrc ^ v) & 1 ) ? ( tcrc >> 1 ) ^ 0x8408 : tcrc >> 1;`
			`v >>= 1;`
			`}`

added tiwrite command, split LF code from appmain into lfops.c 2009-07-25 19:47:43 +08:00			`return ((crc >> 8) ^ tcrc)&0xffff;`
Further additions to tidemod to differentiate between ro and rw tags and check crc validity. 2009-07-22 19:39:39 +08:00			`}`