| /* |
| * 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.apache.hadoop.io.compress; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.io.compress.CompressionOutputStream; |
| import org.apache.hadoop.io.compress.Compressor; |
| |
| @InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public class CompressorStream extends CompressionOutputStream { |
| protected Compressor compressor; |
| protected byte[] buffer; |
| protected boolean closed = false; |
| |
| public CompressorStream(OutputStream out, Compressor compressor, int bufferSize) { |
| super(out); |
| |
| if (out == null || compressor == null) { |
| throw new NullPointerException(); |
| } else if (bufferSize <= 0) { |
| throw new IllegalArgumentException("Illegal bufferSize"); |
| } |
| |
| this.compressor = compressor; |
| buffer = new byte[bufferSize]; |
| } |
| |
| public CompressorStream(OutputStream out, Compressor compressor) { |
| this(out, compressor, 512); |
| } |
| |
| /** |
| * Allow derived classes to directly set the underlying stream. |
| * |
| * @param out Underlying output stream. |
| */ |
| protected CompressorStream(OutputStream out) { |
| super(out); |
| } |
| |
| @Override |
| public void write(byte[] b, int off, int len) throws IOException { |
| // Sanity checks |
| if (compressor.finished()) { |
| throw new IOException("write beyond end of stream"); |
| } |
| if ((off | len | (off + len) | (b.length - (off + len))) < 0) { |
| throw new IndexOutOfBoundsException(); |
| } else if (len == 0) { |
| return; |
| } |
| |
| compressor.setInput(b, off, len); |
| while (!compressor.needsInput()) { |
| compress(); |
| } |
| } |
| |
| protected void compress() throws IOException { |
| int len = compressor.compress(buffer, 0, buffer.length); |
| if (len > 0) { |
| out.write(buffer, 0, len); |
| } |
| } |
| |
| @Override |
| public void finish() throws IOException { |
| if (!compressor.finished()) { |
| compressor.finish(); |
| while (!compressor.finished()) { |
| compress(); |
| } |
| } |
| } |
| |
| @Override |
| public void resetState() throws IOException { |
| compressor.reset(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| if (!closed) { |
| finish(); |
| out.close(); |
| closed = true; |
| } |
| } |
| |
| private byte[] oneByte = new byte[1]; |
| @Override |
| public void write(int b) throws IOException { |
| oneByte[0] = (byte)(b & 0xff); |
| write(oneByte, 0, oneByte.length); |
| } |
| |
| } |