/**
* This function computes / refreshes a crc32 checksum.
*
* @param table this is the precomputed crc32 table
* @param crc set this value to zero if starting the computation or to the last retrieved value
* when processing further data.
* @param buffer the buffer to be walked
* @param off the offset to start
* @param len the amount of bytes to process
* @return the new/refreshed crc checksum
*/
public static int crc32(int[] table, int crc, byte[] buffer, int off, int len) {
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;
}
