ojluni/src/main/java/java/util/jar/JarInputStream.java - platform/libcore.git - Git at Google

 /*
  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code 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.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code 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 in the LICENSE file that
  * accompanied this code).
  *
  * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.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;
 import sun.misc.JarIndex;

 /**
  * 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
  * @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;
     private final boolean doVerify;
     private boolean tryManifest;

     /**
      * 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);
         this.doVerify = verify;

         // This implementation assumes the META-INF/MANIFEST.MF entry
         // should be either the first or the second entry (when preceded
         // by the dir META-INF/). It skips the META-INF/ and then
         // "consumes" the MANIFEST.MF to initialize the Manifest object.
         JarEntry e = (JarEntry)super.getNextEntry();
         if (e != null && e.getName().equalsIgnoreCase("META-INF/"))
             e = (JarEntry)super.getNextEntry();
         first = checkManifest(e);
     }

     private JarEntry checkManifest(JarEntry e)
         throws IOException
     {
         if (e != null && JarFile.MANIFEST_NAME.equalsIgnoreCase(e.getName())) {
             man = new Manifest();
             byte bytes[] = getBytes(new BufferedInputStream(this));
             man.read(new ByteArrayInputStream(bytes));
             closeEntry();
             if (doVerify) {
                 jv = new JarVerifier(bytes);
                 mev = new ManifestEntryVerifier(man);
             }
             return (JarEntry)super.getNextEntry();
         }
         return e;
     }

     private byte[] getBytes(InputStream is)
         throws IOException
     {
         byte[] buffer = new byte[8192];
         ByteArrayOutputStream baos = new ByteArrayOutputStream(2048);
         int n;
         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 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();
             if (tryManifest) {
                 e = checkManifest(e);
                 tryManifest = false;
             }
         } else {
             e = first;
             if (first.getName().equalsIgnoreCase(JarIndex.INDEX_NAME))
                 tryManifest = true;
             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 <code>len</code> is not zero, the method
      * blocks until some input is available; otherwise, no
      * bytes are read and <code>0</code> 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 <code>b</code>
      * @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 <code>b</code> is <code>null</code>.
      * @exception  IndexOutOfBoundsException If <code>off</code> is negative,
      * <code>len</code> is negative, or <code>len</code> is greater than
      * <code>b.length - off</code>
      * @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 <code>JarEntry</code> (<code>ZipEntry</code>) for the
      * specified JAR file entry name. The manifest attributes of
      * the specified JAR file entry name will be copied to the new
      * <CODE>JarEntry</CODE>.
      *
      * @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;
     }
 }
	/*
	* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code 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. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code 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 in the LICENSE file that
	* accompanied this code).
	*
	* 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.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;
	import sun.misc.JarIndex;

	/**
	* 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
	* @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;
	private final boolean doVerify;
	private boolean tryManifest;

	/**
	* 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);
	this.doVerify = verify;

	// This implementation assumes the META-INF/MANIFEST.MF entry
	// should be either the first or the second entry (when preceded
	// by the dir META-INF/). It skips the META-INF/ and then
	// "consumes" the MANIFEST.MF to initialize the Manifest object.
	JarEntry e = (JarEntry)super.getNextEntry();
	if (e != null && e.getName().equalsIgnoreCase("META-INF/"))
	e = (JarEntry)super.getNextEntry();
	first = checkManifest(e);
	}

	private JarEntry checkManifest(JarEntry e)
	throws IOException
	{
	if (e != null && JarFile.MANIFEST_NAME.equalsIgnoreCase(e.getName())) {
	man = new Manifest();
	byte bytes[] = getBytes(new BufferedInputStream(this));
	man.read(new ByteArrayInputStream(bytes));
	closeEntry();
	if (doVerify) {
	jv = new JarVerifier(bytes);
	mev = new ManifestEntryVerifier(man);
	}
	return (JarEntry)super.getNextEntry();
	}
	return e;
	}

	private byte[] getBytes(InputStream is)
	throws IOException
	{
	byte[] buffer = new byte[8192];
	ByteArrayOutputStream baos = new ByteArrayOutputStream(2048);
	int n;
	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 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();
	if (tryManifest) {
	e = checkManifest(e);
	tryManifest = false;
	}
	} else {
	e = first;
	if (first.getName().equalsIgnoreCase(JarIndex.INDEX_NAME))
	tryManifest = true;
	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 <code>len</code> is not zero, the method
	* blocks until some input is available; otherwise, no
	* bytes are read and <code>0</code> 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 <code>b</code>
	* @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 <code>b</code> is <code>null</code>.
	* @exception IndexOutOfBoundsException If <code>off</code> is negative,
	* <code>len</code> is negative, or <code>len</code> is greater than
	* <code>b.length - off</code>
	* @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 <code>JarEntry</code> (<code>ZipEntry</code>) for the
	* specified JAR file entry name. The manifest attributes of
	* the specified JAR file entry name will be copied to the new
	* <CODE>JarEntry</CODE>.
	*
	* @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;
	}
	}