public static boolean isPBMagicPrefix(final byte[] bytes) {
    if (bytes == null) return false;
    return isPBMagicPrefix(bytes, 0, bytes.length);
  }
Returns True if passed <code>bytes</code> has {@link #PB_MAGIC} for a prefix.
hbase-client/src/main/java/org/apache/hadoop/hbase/protobuf/ProtobufMagic.java