/*
* @(#)JarInputStream.java 1.32 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program 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 version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
package java.util.jar;
import java.util.zip.*;
import java.io.*;
import sun.security.util.ManifestEntryVerifier;
/**
* The <code>JarInputStream</code> class is used to read the contents of
* a JAR file from any input stream. It extends the class
* <code>java.util.zip.ZipInputStream</code> with support for reading
* an optional <code>Manifest</code> entry. The <code>Manifest</code>
* can be used to store meta-information about the JAR file and its entries.
*
* @author David Connelly
* @version 1.25, 02/02/00
* @see Manifest
* @see java.util.zip.ZipInputStream
* @since 1.2
*/
public
class JarInputStream extends ZipInputStream {
private Manifest man;
private JarEntry first;
private JarVerifier jv;
private ManifestEntryVerifier mev;
/**
* Creates a new <code>JarInputStream</code> and reads the optional
* manifest. If a manifest is present, also attempts to verify
* the signatures if the JarInputStream is signed.
* @param in the actual input stream
* @exception IOException if an I/O error has occurred
*/
public JarInputStream(InputStream in) throws IOException {
this(in, true);
}
/**
* Creates a new <code>JarInputStream</code> and reads the optional
* manifest. If a manifest is present and verify is true, also attempts
* to verify the signatures if the JarInputStream is signed.
*
* @param in the actual input stream
* @param verify whether or not to verify the JarInputStream if
* it is signed.
* @exception IOException if an I/O error has occurred
*/
public JarInputStream(InputStream in, boolean verify) throws IOException {
super(in);
JarEntry e = (JarEntry)super.getNextEntry();
if (e != null && e.getName().equalsIgnoreCase("META-INF/"))
e = (JarEntry)super.getNextEntry();
if (e != null && JarFile.MANIFEST_NAME.equalsIgnoreCase(e.getName())) {
man = new Manifest();
byte bytes[] = getBytes(new BufferedInputStream(this));
man.read(new ByteArrayInputStream(bytes));
//man.read(new BufferedInputStream(this));
closeEntry();
if (verify) {
jv = new JarVerifier(man, bytes);
mev = new ManifestEntryVerifier(man);
}
first = getNextJarEntry();
} else {
first = e;
}
}
private byte[] getBytes(InputStream is)
throws IOException
{
byte[] buffer = new byte[8192];
ByteArrayOutputStream baos = new ByteArrayOutputStream(2048);
int n;
baos.reset();
while ((n = is.read(buffer, 0, buffer.length)) != -1) {
baos.write(buffer, 0, n);
}
return baos.toByteArray();
}
/**
* Returns the <code>Manifest</code> for this JAR file, or
* <code>null</code> if none.
*
* @return the <code>Manifest</code> for this JAR file, or
* <code>null</code> if none.
*/
public Manifest getManifest() {
return man;
}
/**
* Reads the next ZIP file entry and positions stream at the beginning
* of the entry data.
* @exception ZipException if a ZIP file error has occurred
* @exception IOException if an I/O error has occurred
*/
public ZipEntry getNextEntry() throws IOException {
JarEntry e;
if (first == null) {
e = (JarEntry)super.getNextEntry();
} else {
e = first;
first = null;
}
if (jv != null && e != null) {
// At this point, we might have parsed all the meta-inf
// entries and have nothing to verify. If we have
// nothing to verify, get rid of the JarVerifier object.
if (jv.nothingToVerify() == true) {
jv = null;
mev = null;
} else {
jv.beginEntry(e, mev);
}
}
return e;
}
/**
* Reads the next JAR file entry and positions the stream at the
* beginning of the entry data.
*
* @return the next JAR file entry
* @exception ZipException if a ZIP file error has occurred
* @exception IOException if an I/O error has occurred
*/
public JarEntry getNextJarEntry() throws IOException {
return (JarEntry)getNextEntry();
}
/**
* Reads from the current JAR file entry into an array of bytes.
* Blocks until some input is available.
* @param b the buffer into which the data is read
* @param off the start offset of the data
* @param len the maximum number of bytes to read
* @return the actual number of bytes read, or -1 if the end of the
* entry is reached
* @exception ZipException if a ZIP file error has occurred
* @exception IOException if an I/O error has occurred
*/
public int read(byte[] b, int off, int len) throws IOException {
int n;
if (first == null) {
n = super.read(b, off, len);
} else {
n = -1;
}
if (jv != null) {
jv.update(n, b, off, len, mev);
}
return n;
}
/**
* Creates a new <code>JarEntry</code> (<code>ZipEntry</code>) for the
* specified JAR file entry name.
*
* @param name the name of the JAR/ZIP file entry
* @return the <code>JarEntry</code> object just created
*/
protected ZipEntry createZipEntry(String name) {
JarEntry e = new JarEntry(name);
if (man != null) {
e.attr = man.getAttributes(name);
}
return e;
}
}