77 lines
2.5 KiB
Java
77 lines
2.5 KiB
Java
/*
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* Copyright 2012 dorkbox, llc
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dorkbox.build.util.jar;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.jar.JarFile;
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import java.util.jar.JarInputStream;
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import java.util.jar.Manifest;
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import java.util.zip.ZipEntry;
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import java.util.zip.ZipInputStream;
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import dorkbox.util.Sys;
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/**
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* Necessary for preventing the manifest from mangling the order of it's contents.
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*/
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public class SafeJarInputStream extends JarInputStream {
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private final byte[] manifestBytes;
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public static SafeJarInputStream create(ByteArrayInputStream inputStream) throws IOException {
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// we KNOW that the manifest is the FIRST zip entry!
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// This is stupid, but the only way i know how to get the first entry
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// ALSO.. might not have a manifest!
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final byte[] manifestBytes;
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ZipInputStream zipInputStream = new ZipInputStream(inputStream);
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// this is the SAME as what a JarInputStream does, however the difference is
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// that here we SAVE OUT the bytes, instead of parse them.
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ZipEntry e = zipInputStream.getNextEntry();
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if (e != null && e.getName().equalsIgnoreCase("META-INF/")) {
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e = zipInputStream.getNextEntry();
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}
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if (e != null && JarFile.MANIFEST_NAME.equalsIgnoreCase(e.getName())) {
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manifestBytes = Sys.getBytesFromStream(zipInputStream);
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} else {
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manifestBytes = null;
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}
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Sys.close(zipInputStream);
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inputStream.reset();
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return new SafeJarInputStream(inputStream, true, manifestBytes);
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}
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private SafeJarInputStream(InputStream in, boolean verify, byte[] manifestBytes) throws IOException {
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super(in, verify);
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this.manifestBytes = manifestBytes;
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}
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@Override
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public Manifest getManifest() {
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if (this.manifestBytes == null) {
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return null;
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}
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return new SafeManifest(this.manifestBytes);
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}
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}
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