| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.jclouds.netty.io; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.RandomAccessFile; |
| |
| import org.jboss.netty.buffer.ChannelBuffer; |
| import org.jboss.netty.handler.stream.ChunkedFile; |
| |
| public class ChunkedFileInputStream extends InputStream { |
| |
| private static final int CHUNK_SIZE = 8192; |
| |
| private ChunkedFile chunks; |
| private ChannelBuffer chunk; |
| |
| private IOException ex; |
| |
| public ChunkedFileInputStream(String filename, long offset, long length) { |
| this(new File(filename), offset, length); |
| } |
| |
| public ChunkedFileInputStream(File file, long offset, long length) { |
| try { |
| this.chunks = new ChunkedFile(new RandomAccessFile(file, "r"), offset, length, CHUNK_SIZE); |
| } catch (IOException ex) { |
| this.ex = ex; |
| } |
| } |
| |
| private ChannelBuffer getChunk() throws Exception { |
| if (ex != null) { |
| throw ex; |
| } |
| if (chunk == null) { |
| chunk = ChannelBuffer.class.cast(chunks.nextChunk()); |
| } |
| if (chunk != null) { |
| if (chunk.readableBytes() < 1 && chunks.hasNextChunk()) { |
| chunk = ChannelBuffer.class.cast(chunks.nextChunk()); |
| if (chunk.readableBytes() < 1) { |
| return null; |
| } |
| } |
| } else { |
| return null; |
| } |
| return chunk; |
| } |
| |
| @Override |
| public int read() throws IOException { |
| try { |
| ChannelBuffer chunk = getChunk(); |
| if (chunk == null) |
| return -1; |
| if (chunk.readableBytes() < 1) |
| return -1; |
| int readIndex = chunk.readerIndex(); |
| byte abyte = chunk.getByte(readIndex); |
| chunk.readerIndex(readIndex + 1); |
| return (int) abyte; |
| } catch (Exception e) { |
| throw new IOException(e); |
| } |
| } |
| |
| @Override |
| public int read(byte[] b, int off, int len) throws IOException { |
| try { |
| ChannelBuffer chunk = getChunk(); |
| if (chunk == null) |
| return -1; |
| int readable = chunk.readableBytes(); |
| if (readable < 1) |
| return -1; |
| if (readable > len) { |
| readable = len; |
| } |
| int readIndex = chunk.readerIndex(); |
| chunk.getBytes(readIndex, b, off, readable); |
| chunk.readerIndex(readIndex + readable); |
| return readable; |
| } catch (Exception e) { |
| throw new IOException(e); |
| } |
| } |
| |
| @Override |
| public void close() throws IOException { |
| try { |
| chunks.close(); |
| } catch (Exception e) { |
| throw new IOException(e); |
| } |
| } |
| |
| } |