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, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019 package org.apache.commons.compress.compressors.gzip; 020 021 import java.io.IOException; 022 import java.io.InputStream; 023 import java.util.zip.GZIPInputStream; 024 025 import org.apache.commons.compress.compressors.CompressorInputStream; 026 027 /** 028 * Implements the "gz" compression format as an input stream. 029 * This classes wraps the standard java classes for working with gz. 030 */ 031 public class GzipCompressorInputStream extends CompressorInputStream { 032 /* reference to the compressed stream */ 033 private final GZIPInputStream in; 034 035 /** 036 * Constructs a new GZip compressed input stream by the referenced 037 * InputStream. 038 * 039 * @param inputStream the InputStream from which this object should be created of 040 * @throws IOException if the stream could not be created 041 */ 042 public GzipCompressorInputStream(InputStream inputStream) throws IOException { 043 in = new GZIPInputStream(inputStream); 044 } 045 046 /* (non-Javadoc) 047 * @see java.io.InputStream#read() 048 */ 049 public int read() throws IOException { 050 int read = in.read(); 051 this.count(read < 0 ? -1 : 1); 052 return read; 053 } 054 055 /* (non-Javadoc) 056 * @see java.io.InputStream#read(byte[]) 057 */ 058 public int read(byte[] b) throws IOException { 059 int read = in.read(b); 060 this.count(read); 061 return read; 062 } 063 064 /* (non-Javadoc) 065 * @see java.io.InputStream#read(byte[], int, int) 066 */ 067 public int read(byte[] b, int from, int length) throws IOException { 068 int read = in.read(b, from, length); 069 this.count(read); 070 return read; 071 } 072 }