content: // Protocol Buffers - Google's data interchange format
  // Copyright 2008 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,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.util.Queue;
  
  /** Utilities for serialization. */
  public class ExperimentalSerializationUtil {
  
    /**
     * Serializes the given message to a byte array using {@link com.google.protobuf.BinaryWriter}.
     */
    public static <T> byte[] toByteArray(T msg) throws IOException {
      return toByteArray(msg, Protobuf.getInstance().schemaFor(msg));
    }
  
    /**
     * Serializes the given message to a byte array using {@link com.google.protobuf.BinaryWriter}
     * with a customized Schema.
     */
    public static <T> byte[] toByteArray(T msg, Schema<T> schema) throws IOException {
      BinaryWriter writer = BinaryWriter.newHeapInstance(BufferAllocator.unpooled());
      schema.writeTo(msg, writer);
  
      byte[] out = new byte[writer.getTotalBytesWritten()];
      int outPos = 0;
      Queue<AllocatedBuffer> buffers = writer.complete();
      while (true) {
        AllocatedBuffer buffer = buffers.poll();
        if (buffer == null) {
          break;
        }
        int length = buffer.limit() - buffer.position();
        System.arraycopy(
            buffer.array(), buffer.arrayOffset() + buffer.position(), out, outPos, length);
        outPos += length;
      }
      if (out.length != outPos) {
        throw new IllegalArgumentException("Failed to serialize test message");
      }
      return out;
    }
  
    /** Deserializes a message from the given byte array. */
    public static <T> T fromByteArray(byte[] data, Class<T> messageType) {
      if (Android.isOnAndroidDevice()) {
        return fromByteArrayFastPath(data, messageType);
      } else {
        return fromByteArray(data, messageType, ExtensionRegistryLite.getEmptyRegistry());
      }
    }
  
    /**
     * Deserializes a message from the given byte array using {@link com.google.protobuf.BinaryReader}
     * with an extension registry and a customized Schema.
     */
    public static <T> T fromByteArray(
        byte[] data, Class<T> messageType, ExtensionRegistryLite extensionRegistry) {
      try {
        Schema<T> schema = Protobuf.getInstance().schemaFor(messageType);
        T msg = schema.newInstance();
        schema.mergeFrom(
            msg, BinaryReader.newInstance(ByteBuffer.wrap(data), true), extensionRegistry);
        schema.makeImmutable(msg);
        return msg;
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
    }
  
    /** Deserializes a lite message from the given byte array using fast path. */
    private static <T> T fromByteArrayFastPath(byte[] data, Class<T> messageType) {
      try {
        Schema<T> schema = Protobuf.getInstance().schemaFor(messageType);
        T msg = schema.newInstance();
        schema.mergeFrom(msg, data, 0, data.length, new ArrayDecoders.Registers());
        schema.makeImmutable(msg);
        return msg;
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
    }
  }
  