Java Utililty Methods CRC Calculate

List of utility methods to do CRC Calculate

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Description

The list of methods to do CRC Calculate are organized into topic(s).

Method

StringcomputeCrc32(InputStream is)
Compute the CRC-32 of the contents of a stream. 
Checksum crc = new CRC32();
int last = -1;
int curr;
while ((curr = is.read()) != -1) {
    if (curr != '\n' && last == '\r') {
        crc.update('\n');
    if (curr != '\r') {
...
StringCRC(String message)
CRC 
byte[] bytes = message.getBytes();
int crc = 0x0000;
for (byte b : bytes) {
    crc = (crc >>> 8) ^ table[(crc ^ b) & 0xff];
return Integer.toHexString(crc);
intcrc16(byte[] bytes)
crc 
int crc = 0x0000;
for (byte b : bytes) {
    crc = ((crc << 8) ^ LOOKUP_TABLE[((crc >>> 8) ^ (b & 0xFF)) & 0xFF]);
return crc & 0xFFFF;
intcrc16(final byte[] bytes)
crc 
int crc = 0xFFFF;
for (int j = 0; j < bytes.length; j++) {
    crc = ((crc >>> 8) | (crc << 8)) & 0xffff;
    crc ^= (bytes[j] & 0xff);
    crc ^= ((crc & 0xff) >> 4);
    crc ^= (crc << 12) & 0xffff;
    crc ^= ((crc & 0xFF) << 5) & 0xffff;
crc &= 0xffff;
return crc;
intcrc16_get(byte aby[], int nOffset, int nLength)
crget 
return crc16_get(aby, nOffset, nLength, 0xffff);
shortCRC16_TABLE(byte[] aData, int aSize)
CRTABLE 
short nAccum = 0;
for (int i = 0; i < aSize; i++)
    nAccum = (short) ((nAccum << 8) ^ CRC16Table[((nAccum >>> 8) ^ aData[i]) & 0x00FF]);
return nAccum;
intcrc32(byte[] array, int offset, int size)
CRC32 checksum of a byte array range 
int crc = 0xFFFF;
for (int pos = offset; pos < offset + size; pos++) {
    crc ^= (int) array[pos];
    for (int i = 8; i != 0; i--) {
        if ((crc & 0x0001) != 0) {
            crc >>= 1;
            crc ^= 0xA001;
        } else {
...
intCRC32(final byte[] buf, final int startPos, final int endPos)
CRC 
long c = 0xFFFFFFFFL;
for (int i = startPos; i < endPos; i++) {
    c = (crcTable[(int) ((c ^ buf[i]) & 0xFF)] ^ (c >> 8));
return (int) (c ^ 0xFFFFFFFFL);
intcrc32(int[] table, int crc, byte[] buffer, int off, int len)
This function computes / refreshes a crc32 checksum. 
if (table[2] == 0) {
    initCrc32Table(table);
crc = crc ^ 0xffffffff;
for (int n = 0; n < len; n++) {
    crc = table[(crc ^ buffer[n + off]) & 0xff] ^ (crc >>> 8);
return 0xffffffff ^ crc;
...
longcrc32(long crcin, byte[] buf, int off, int alen)
crc 
long crc = (crcin & MAXINT_MASK) ^ MAXINT_MASK;
int len = alen;
while (len > 0) {
    crc = _crcTable[((int) crc ^ buf[off++]) & 0xFF] ^ (crc >> 8);
    len--;
final long result = crc ^ MAXINT_MASK;
return result;
...