short computeChecksum(byte[] data, int start) {
int sum = 0, carry = 0, finalSum = 0;
int wordData;
- int end = start + this.getHeaderSize() / NetUtils.NumBitsInAByte
- + rawPayload.length;
- int checksumStartByte = start + getfieldOffset(CHECKSUM)
- / NetUtils.NumBitsInAByte;
+ int end = start + this.getHeaderSize() / NetUtils.NumBitsInAByte;
+ if (rawPayload != null) {
+ end += rawPayload.length;
+ }
+ int checksumStartByte = start + getfieldOffset(CHECKSUM) / NetUtils.NumBitsInAByte;
for (int i = start; i <= (end - 1); i = i + 2) {
// Skip, if the current bytes are checkSum bytes