001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019 package org.apache.hadoop.io.compress;
020
021 import java.io.IOException;
022 import java.io.OutputStream;
023
024 import org.apache.hadoop.classification.InterfaceAudience;
025 import org.apache.hadoop.classification.InterfaceStability;
026 import org.apache.hadoop.io.compress.CompressionOutputStream;
027 import org.apache.hadoop.io.compress.Compressor;
028
029 @InterfaceAudience.Public
030 @InterfaceStability.Evolving
031 public class CompressorStream extends CompressionOutputStream {
032 protected Compressor compressor;
033 protected byte[] buffer;
034 protected boolean closed = false;
035
036 public CompressorStream(OutputStream out, Compressor compressor, int bufferSize) {
037 super(out);
038
039 if (out == null || compressor == null) {
040 throw new NullPointerException();
041 } else if (bufferSize <= 0) {
042 throw new IllegalArgumentException("Illegal bufferSize");
043 }
044
045 this.compressor = compressor;
046 buffer = new byte[bufferSize];
047 }
048
049 public CompressorStream(OutputStream out, Compressor compressor) {
050 this(out, compressor, 512);
051 }
052
053 /**
054 * Allow derived classes to directly set the underlying stream.
055 *
056 * @param out Underlying output stream.
057 */
058 protected CompressorStream(OutputStream out) {
059 super(out);
060 }
061
062 public void write(byte[] b, int off, int len) throws IOException {
063 // Sanity checks
064 if (compressor.finished()) {
065 throw new IOException("write beyond end of stream");
066 }
067 if ((off | len | (off + len) | (b.length - (off + len))) < 0) {
068 throw new IndexOutOfBoundsException();
069 } else if (len == 0) {
070 return;
071 }
072
073 compressor.setInput(b, off, len);
074 while (!compressor.needsInput()) {
075 compress();
076 }
077 }
078
079 protected void compress() throws IOException {
080 int len = compressor.compress(buffer, 0, buffer.length);
081 if (len > 0) {
082 out.write(buffer, 0, len);
083 }
084 }
085
086 public void finish() throws IOException {
087 if (!compressor.finished()) {
088 compressor.finish();
089 while (!compressor.finished()) {
090 compress();
091 }
092 }
093 }
094
095 public void resetState() throws IOException {
096 compressor.reset();
097 }
098
099 public void close() throws IOException {
100 if (!closed) {
101 finish();
102 out.close();
103 closed = true;
104 }
105 }
106
107 private byte[] oneByte = new byte[1];
108 public void write(int b) throws IOException {
109 oneByte[0] = (byte)(b & 0xff);
110 write(oneByte, 0, oneByte.length);
111 }
112
113 }