public void
writeByteArray(byte [] b, int off, int len) {
	need(len);
	System.arraycopy(b, off, array, pos, len);
	pos += len;
}
Writes a byte array to the stream.
@param b The array to write.
@param off The offset of the array to start copying data from.
@param len The number of bytes to write.
src/main/java/core/org/xbill/DNS/DNSOutput.java