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