bundles/org.simantics.compressions/src/org/simantics/compressions/impl/Buffers.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2012 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.compressions.impl;
  13
  14 import java.nio.ByteBuffer;
  15
  16 /**
  17  * @author Tuukka Lehtonen
  18  */
  19 public class Buffers {
  20
  21         public static byte[] getInputArray(ByteBuffer buffer) {
  22                 if (buffer.hasArray())
  23                         return buffer.array();
  24                 // Poor performance fallback involving copying.
  25                 byte[] copy = new byte[buffer.remaining()];
  26                 buffer.get(copy);
  27                 return copy;
  28         }
  29
  30         public static byte[] getOutputArray(ByteBuffer buffer) {
  31                 return buffer.hasArray() ? buffer.array() : new byte[buffer.remaining()];
  32         }
  33
  34         public static void writeOutput(ByteBuffer buffer, byte[] array) {
  35                 if (buffer.hasArray() && buffer.array() == array)
  36                         return;
  37                 // Poor performance fallback involving copying.
  38                 int pos = buffer.position();
  39                 buffer.put(array);
  40                 buffer.position(pos);
  41         }
  42
  43 }