..Souce Code of java.util.jar.
/*
* @(#)JarInputStream.java 1.37 06/04/07
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.util.jar;
import java.util.zip.*;
import java.io.*;
import sun.security.util.ManifestEntryVerifier;
/**
* The JarInputStream class is used to read the contents of
* a JAR file from any input stream. It extends the class
* java.util.zip.ZipInputStream with support for reading
* an optional Manifest entry. The Manifest
* can be used to store meta-information about the JAR file and its entries.
*
* @author
David Connelly
* @version 1.37, 04/07/06
* @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 JarInputStream 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 JarInputStream 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(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 Manifest for this JAR file, or
* null if none.
*
* @return the Manifest for this JAR file, or
*
null if none.
*/
public Manifest getManifest() {
return man;
}
/**
* Reads the next ZIP file entry and positions the stream at the
* beginning of the entry data. If verification has been enabled,
* any invalid signature detected while positioning the stream for
* the next entry will result in an exception.
* @exception ZipException if a ZIP file error has occurred
* @exception IOException if an I/O error has occurred
* @exception SecurityException if any of the jar file entries
*
are incorrectly signed.
*/
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. If verification has been enabled,
* any invalid signature detected while positioning the stream for
* the next entry will result in an exception.
* @return the next JAR file entry, or null if there are no more entries
* @exception ZipException if a ZIP file error has occurred
* @exception IOException if an I/O error has occurred
* @exception SecurityException if any of the jar file entries
*
are incorrectly signed.
*/
public JarEntry getNextJarEntry() throws IOException {
return (JarEntry)getNextEntry();
}
/**
* Reads from the current JAR file entry into an array of bytes.
* If len is not zero, the method
* blocks until some input is available; otherwise, no
* bytes are read and 0 is returned.
* If verification has been enabled, any invalid signature
* on the current entry will be reported at some point before the
* end of the entry is reached.
* @param b the buffer into which the data is read
* @param off the start offset in the destination array b
* @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
NullPointerException If b is null.
* @exception
IndexOutOfBoundsException If off is negative,
* len is negative, or len is greater than
* b.length - off
* @exception ZipException if a ZIP file error has occurred
* @exception IOException if an I/O error has occurred
* @exception SecurityException if any of the jar file entries
*
are incorrectly signed.
*/
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 JarEntry (ZipEntry) for the
* specified JAR file entry name. The manifest attributes of
* the specified JAR file entry name will be copied to the new
* JarEntry.
*
* @param name the name of the JAR/ZIP file entry
* @return the JarEntry object just created
*/
protected ZipEntry createZipEntry(String name) {
JarEntry e = new JarEntry(name);
if (man != null) {
e.attr = man.getAttributes(name);
}
return e;
}
}
Related Class of java.util.jar.JarInputStream
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