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package sun.misc;

The CRC-16 class calculates a 16 bit cyclic redundancy check of a set of bytes. This error detecting code is used to determine if bit rot has occured in a byte stream.
/** * The CRC-16 class calculates a 16 bit cyclic redundancy check of a set * of bytes. This error detecting code is used to determine if bit rot * has occured in a byte stream. */
public class CRC16 {
value contains the currently computed CRC, set it to 0 initally
/** value contains the currently computed CRC, set it to 0 initally */
public int value; public CRC16() { value = 0; }
update CRC with byte b
/** update CRC with byte b */
public void update(byte aByte) { int a, b; a = (int) aByte; for (int count = 7; count >=0; count--) { a = a << 1; b = (a >>> 8) & 1; if ((value & 0x8000) != 0) { value = ((value << 1) + b) ^ 0x1021; } else { value = (value << 1) + b; } } value = value & 0xffff; return; }
reset CRC value to 0
/** reset CRC value to 0 */
public void reset() { value = 0; } }