1 /* JarInputStream.java - InputStream for reading jar files
2 Copyright (C) 2000 Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING. If not, write to the
18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
38 package java
.util
.jar
;
40 import java
.io
.InputStream
;
41 import java
.io
.IOException
;
42 import java
.util
.zip
.ZipEntry
;
43 import java
.util
.zip
.ZipInputStream
;
46 * InputStream for reading jar files.
47 * XXX - verification of the signatures in the Manifest file is not yet
51 * @author Mark Wielaard (mark@klomp.org)
54 public class JarInputStream
extends ZipInputStream
58 /** The manifest for this file or null when there was no manifest. */
59 private Manifest manifest
;
61 /** The first real JarEntry for this file. Used by readManifest() to store
62 an entry that isn't the manifest but that should be returned by
63 getNextEntry next time it is called. Null when no firstEntry was read
64 while searching for the manifest entry, or when it has already been
65 returned by getNextEntry(). */
66 private JarEntry firstEntry
;
71 * Creates a new JarInputStream and tries to read the manifest.
72 * If such a manifest is present the JarInputStream tries to verify all
73 * the entry signatures while reading.
75 * @param in InputStream to read the jar from
76 * @exception IOException when an error occurs when opening or reading
78 public JarInputStream(InputStream in
) throws IOException
84 * Creates a new JarInputStream and tries to read the manifest.
85 * If such a manifest is present and verify is true, the JarInputStream
86 * tries to verify all the entry signatures while reading.
88 * @param in InputStream to read the jar from
89 * @param verify whether or not to verify the manifest entries
90 * @exception IOException when an error occurs when opening or reading
92 public JarInputStream(InputStream in
, boolean verify
) throws IOException
101 * Set the manifest if found. Skips all entries that start with "META-INF/"
103 * @param verify when true (and a Manifest is found) checks the Manifest,
104 * when false no check is performed
105 * @exception IOException if an error occurs while reading
107 private void readManifest(boolean verify
) throws IOException
109 firstEntry
= (JarEntry
) super.getNextEntry();
110 while ((firstEntry
!= null) &&
111 firstEntry
.getName().startsWith("META-INF/"))
113 if (firstEntry
.getName().equals(JarFile
.MANIFEST_NAME
))
115 manifest
= new Manifest(this);
117 firstEntry
= (JarEntry
) super.getNextEntry();
127 * Creates a JarEntry for a particular name and consults the manifest
128 * for the Attributes of the entry.
129 * Used by <code>ZipEntry.getNextEntry()</code>
131 * @param name the name of the new entry
133 protected ZipEntry
createZipEntry(String name
)
135 ZipEntry zipEntry
= super.createZipEntry(name
);
136 JarEntry jarEntry
= new JarEntry(zipEntry
);
137 if (manifest
!= null)
139 jarEntry
.attr
= manifest
.getAttributes(name
);
145 * Returns the Manifest for the jar file or null if there was no Manifest.
147 public Manifest
getManifest()
153 * Returns the next entry or null when there are no more entries.
154 * Does actually return a JarEntry, if you don't want to cast it yourself
155 * use <code>getNextJarEntry()</code>. Does not return any entries found
156 * at the beginning of the ZipFile that are special
157 * (those that start with "META-INF/").
159 * @exception IOException if an IO error occurs when reading the entry
161 public ZipEntry
getNextEntry() throws IOException
164 if (firstEntry
!= null)
171 entry
= super.getNextEntry();
177 * Returns the next jar entry or null when there are no more entries.
179 * @exception IOException if an IO error occurs when reading the entry
181 public JarEntry
getNextJarEntry() throws IOException
183 return (JarEntry
) getNextEntry();
193 * @exception IOException XXX
195 public int read(byte[]buf
, int off
, int len
) throws IOException
197 // XXX if (verify) {}
198 return super.read(buf
, off
, len
);