content: /*
   * Copyright (C) 2016 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.android.apksig.internal.util;
  
  import com.android.apksig.util.DataSink;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.nio.ByteBuffer;
  
  /**
   * {@link DataSink} which outputs received data into the associated {@link OutputStream}.
   */
  public class OutputStreamDataSink implements DataSink {
  
      private static final int MAX_READ_CHUNK_SIZE = 65536;
  
      private final OutputStream mOut;
  
      /**
       * Constructs a new {@code OutputStreamDataSink} which outputs received data into the provided
       * {@link OutputStream}.
       */
      public OutputStreamDataSink(OutputStream out) {
          if (out == null) {
              throw new NullPointerException("out == null");
          }
          mOut = out;
      }
  
      /**
       * Returns {@link OutputStream} into which this data sink outputs received data.
       */
      public OutputStream getOutputStream() {
          return mOut;
      }
  
      @Override
      public void consume(byte[] buf, int offset, int length) throws IOException {
          mOut.write(buf, offset, length);
      }
  
      @Override
      public void consume(ByteBuffer buf) throws IOException {
          if (!buf.hasRemaining()) {
              return;
          }
  
          if (buf.hasArray()) {
              mOut.write(
                      buf.array(),
                      buf.arrayOffset() + buf.position(),
                      buf.remaining());
              buf.position(buf.limit());
          } else {
              byte[] tmp = new byte[Math.min(buf.remaining(), MAX_READ_CHUNK_SIZE)];
              while (buf.hasRemaining()) {
                  int chunkSize = Math.min(buf.remaining(), tmp.length);
                  buf.get(tmp, 0, chunkSize);
                  mOut.write(tmp, 0, chunkSize);
              }
          }
      }
  }
  