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.archivers.jar; 020 021 import java.io.IOException; 022 import java.io.InputStream; 023 024 import org.apache.commons.compress.archivers.ArchiveEntry; 025 import org.apache.commons.compress.archivers.zip.ZipArchiveEntry; 026 import org.apache.commons.compress.archivers.zip.ZipArchiveInputStream; 027 028 /** 029 * Implements an input stream that can read entries from jar files. 030 * 031 * @NotThreadSafe 032 */ 033 public class JarArchiveInputStream extends ZipArchiveInputStream { 034 035 public JarArchiveInputStream( final InputStream inputStream ) { 036 super(inputStream); 037 } 038 039 public JarArchiveEntry getNextJarEntry() throws IOException { 040 ZipArchiveEntry entry = getNextZipEntry(); 041 return entry == null ? null : new JarArchiveEntry(entry); 042 } 043 044 @Override 045 public ArchiveEntry getNextEntry() throws IOException { 046 return getNextJarEntry(); 047 } 048 049 /** 050 * Checks if the signature matches what is expected for a jar file 051 * (in this case it is the same as for a zip file). 052 * 053 * @param signature 054 * the bytes to check 055 * @param length 056 * the number of bytes to check 057 * @return true, if this stream is a jar archive stream, false otherwise 058 */ 059 public static boolean matches(byte[] signature, int length ) { 060 return ZipArchiveInputStream.matches(signature, length); 061 } 062 }