public static int calcCrcCCITT(byte b[], int bOfs, int bLen) {
int W = 0xFFFF;
if (b != null) {
/* initialize CRC table */
if (crc_CCITT_Table == null) {
Checksum.initCrcCCITT();
}
/* adjust offset/length */
int ofs = (bOfs <= 0) ? 0 : (bOfs >= b.length) ? b.length : bOfs;
int len = ((bLen >= 0) && (bLen <= (b.length - ofs))) ? bLen : (b.length - ofs);
/* calc CRC */
for (int i = 0; i < len; i++) {
W = (crc_CCITT_Table[(b[i + ofs] ^ (W >>> 8)) & 0xFF] ^ (W << 8)) & 0xFFFF;
}
}
return W;
}
/* startup init */
static {
Checksum.initCrcCCITT();
}