| /* JarInputStream.java - InputStream for reading jar files |
| Copyright (C) 2000, 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package java.util.jar; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.zip.ZipEntry; |
| import java.util.zip.ZipInputStream; |
| |
| /** |
| * InputStream for reading jar files. |
| * XXX - verification of the signatures in the Manifest file is not yet |
| * implemented. |
| * |
| * @since 1.2 |
| * @author Mark Wielaard (mark@klomp.org) |
| */ |
| |
| public class JarInputStream extends ZipInputStream |
| { |
| // Fields |
| |
| /** The manifest for this file or null when there was no manifest. */ |
| private Manifest manifest; |
| |
| /** The first real JarEntry for this file. Used by readManifest() to store |
| an entry that isn't the manifest but that should be returned by |
| getNextEntry next time it is called. Null when no firstEntry was read |
| while searching for the manifest entry, or when it has already been |
| returned by getNextEntry(). */ |
| private JarEntry firstEntry; |
| |
| // Constructors |
| |
| /** |
| * Creates a new JarInputStream and tries to read the manifest. |
| * If such a manifest is present the JarInputStream tries to verify all |
| * the entry signatures while reading. |
| * |
| * @param in InputStream to read the jar from |
| * @exception IOException when an error occurs when opening or reading |
| */ |
| public JarInputStream(InputStream in) throws IOException |
| { |
| this(in, true); |
| } |
| |
| /** |
| * Creates a new JarInputStream and tries to read the manifest. |
| * If such a manifest is present and verify is true, the JarInputStream |
| * tries to verify all the entry signatures while reading. |
| * |
| * @param in InputStream to read the jar from |
| * @param verify whether or not to verify the manifest entries |
| * @exception IOException when an error occurs when opening or reading |
| */ |
| public JarInputStream(InputStream in, boolean verify) throws IOException |
| { |
| super(in); |
| readManifest(verify); |
| } |
| |
| // Methods |
| |
| /** |
| * Set the manifest if found. Skips all entries that start with "META-INF/" |
| * |
| * @param verify when true (and a Manifest is found) checks the Manifest, |
| * when false no check is performed |
| * @exception IOException if an error occurs while reading |
| */ |
| private void readManifest(boolean verify) throws IOException |
| { |
| firstEntry = (JarEntry) super.getNextEntry(); |
| while ((firstEntry != null) && |
| firstEntry.getName().startsWith("META-INF/")) |
| { |
| if (firstEntry.getName().equals(JarFile.MANIFEST_NAME)) |
| { |
| manifest = new Manifest(this); |
| } |
| firstEntry = (JarEntry) super.getNextEntry(); |
| } |
| |
| if (verify) |
| { |
| // XXX |
| } |
| } |
| |
| /** |
| * Creates a JarEntry for a particular name and consults the manifest |
| * for the Attributes of the entry. |
| * Used by <code>ZipEntry.getNextEntry()</code> |
| * |
| * @param name the name of the new entry |
| */ |
| protected ZipEntry createZipEntry(String name) |
| { |
| ZipEntry zipEntry = super.createZipEntry(name); |
| JarEntry jarEntry = new JarEntry(zipEntry); |
| if (manifest != null) |
| { |
| jarEntry.attr = manifest.getAttributes(name); |
| } |
| return jarEntry; |
| } |
| |
| /** |
| * Returns the Manifest for the jar file or null if there was no Manifest. |
| */ |
| public Manifest getManifest() |
| { |
| return manifest; |
| } |
| |
| /** |
| * Returns the next entry or null when there are no more entries. |
| * Does actually return a JarEntry, if you don't want to cast it yourself |
| * use <code>getNextJarEntry()</code>. Does not return any entries found |
| * at the beginning of the ZipFile that are special |
| * (those that start with "META-INF/"). |
| * |
| * @exception IOException if an IO error occurs when reading the entry |
| */ |
| public ZipEntry getNextEntry() throws IOException |
| { |
| ZipEntry entry; |
| if (firstEntry != null) |
| { |
| entry = firstEntry; |
| firstEntry = null; |
| } |
| else |
| { |
| entry = super.getNextEntry(); |
| } |
| return entry; |
| } |
| |
| /** |
| * Returns the next jar entry or null when there are no more entries. |
| * |
| * @exception IOException if an IO error occurs when reading the entry |
| */ |
| public JarEntry getNextJarEntry() throws IOException |
| { |
| return (JarEntry) getNextEntry(); |
| } |
| |
| /** |
| * XXX |
| * |
| * @param buf XXX |
| * @param off XXX |
| * @param len XXX |
| * @return XXX |
| * @exception IOException XXX |
| */ |
| public int read(byte[]buf, int off, int len) throws IOException |
| { |
| // XXX if (verify) {} |
| return super.read(buf, off, len); |
| } |
| } |