Here you can find the source of gunzip(InputStream packedData, OutputStream unpackedData)
public static void gunzip(InputStream packedData, OutputStream unpackedData) throws IOException
//package com.java2s; /*/*from w ww.j a v a 2s. c o m*/ * The MIT License (MIT) * <p/> * Copyright (c) 2015 Maksym Dominichenko * <p/> * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * <p/> * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * <p/> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ import java.io.*; import java.util.zip.GZIPInputStream; public class Main { private static final int BUFFER_SIZE = 4096; public static void gunzip(InputStream packedData, OutputStream unpackedData) throws IOException { copy(new GZIPInputStream(packedData), unpackedData); } public static void copy(InputStream sourceData, OutputStream targetData) throws IOException { final byte[] buffer = new byte[BUFFER_SIZE]; for (int c = 0; c >= 0; c = sourceData.read(buffer, 0, buffer.length)) if (c > 0) targetData.write(buffer, 0, c); targetData.flush(); } }