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Protocol Buffers are a way of encoding structured data in an efficient yet extensible format.

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// Protocol Buffers - Google's data interchange format
// Copyright 2013 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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package com.google.protobuf.nano;

import java.io.IOException;
import java.util.Arrays;

/**
 * Stores unknown fields. These might be extensions or fields that the generated
 * API doesn't know about yet.
 *
 * @author [email protected] (Brian Duff)
 */
final class UnknownFieldData {

    final int tag;
    /**
     * Important: this should be treated as immutable, even though it's possible
     * to change the array values.
     */
    final byte[] bytes;

    UnknownFieldData(int tag, byte[] bytes) {
        this.tag = tag;
        this.bytes = bytes;
    }

    int computeSerializedSize() {
        int size = 0;
        size += CodedOutputByteBufferNano.computeRawVarint32Size(tag);
        size += bytes.length;
        return size;
    }

    void writeTo(CodedOutputByteBufferNano output) throws IOException {
        output.writeRawVarint32(tag);
        output.writeRawBytes(bytes);
    }

    @Override
    public boolean equals(Object o) {
        if (o == this) {
            return true;
        }
        if (!(o instanceof UnknownFieldData)) {
            return false;
        }

        UnknownFieldData other = (UnknownFieldData) o;
        return tag == other.tag && Arrays.equals(bytes, other.bytes);
    }

    @Override
    public int hashCode() {
        int result = 17;
        result = 31 * result + tag;
        result = 31 * result + Arrays.hashCode(bytes);
        return result;
    }
}