1 /* 2 * Copyright 2012 Sebastian Annies, Hamburg 3 * 4 * Licensed under the Apache License, Version 2.0 (the License); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an AS IS BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.googlecode.mp4parser.util; 17 18 import java.io.EOFException; 19 import java.io.IOException; 20 import java.nio.ByteBuffer; 21 import java.nio.channels.ByteChannel; 22 23 /** 24 * Creates a <code>ReadableByteChannel</code> that is backed by a <code>ByteBuffer</code>. 25 */ 26 public class ByteBufferByteChannel implements ByteChannel { 27 ByteBuffer byteBuffer; 28 29 public ByteBufferByteChannel(ByteBuffer byteBuffer) { 30 this.byteBuffer = byteBuffer; 31 } 32 33 public int read(ByteBuffer dst) throws IOException { 34 byte[] b = dst.array(); 35 int r = dst.remaining(); 36 if (byteBuffer.remaining() >= r) { 37 byteBuffer.get(b, dst.position(), r); 38 return r; 39 } else { 40 throw new EOFException("Reading beyond end of stream"); 41 } 42 } 43 44 public boolean isOpen() { 45 return true; 46 } 47 48 public void close() throws IOException { 49 } 50 51 public int write(ByteBuffer src) throws IOException { 52 int r = src.remaining(); 53 byteBuffer.put(src); 54 return r; 55 } 56 } 57
