Initial revision

From-SVN: r102074

1 files changed, 200 insertions, 0 deletions

diff --git a/libjava/classpath/java/util/jar/JarInputStream.java b/libjava/classpath/java/util/jar/JarInputStream.java
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+/* 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., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 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);
+  }
+}