}
int bytesRead = in.read(b, off, len);
if (bytesRead < 0) {
throw new ChecksumException("Checksum Error", 0);
}
sum.update(b,off,bytesRead);
currentOffset += bytesRead;
if (currentOffset == dataLength) {
// The last four bytes are checksum. Strip them and verify
csum = new byte[checksumSize];
IOUtils.readFully(in, csum, 0, checksumSize);
if (!sum.compare(csum, 0)) {
throw new ChecksumException("Checksum Error", 0);
}
}
return bytesRead;
}