| /* |
| * Copyright (c) 1997, 2006, 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.*; |
| |
| /** |
| * The <code>JarOutputStream</code> class is used to write the contents |
| * of a JAR file to any output stream. It extends the class |
| * <code>java.util.zip.ZipOutputStream</code> with support |
| * for writing an optional <code>Manifest</code> entry. The |
| * <code>Manifest</code> can be used to specify meta-information about |
| * the JAR file and its entries. |
| * |
| * @author David Connelly |
| * @see Manifest |
| * @see java.util.zip.ZipOutputStream |
| * @since 1.2 |
| */ |
| public |
| class JarOutputStream extends ZipOutputStream { |
| private static final int JAR_MAGIC = 0xCAFE; |
| |
| /** |
| * Creates a new <code>JarOutputStream</code> with the specified |
| * <code>Manifest</code>. The manifest is written as the first |
| * entry to the output stream. |
| * |
| * @param out the actual output stream |
| * @param man the optional <code>Manifest</code> |
| * @exception IOException if an I/O error has occurred |
| */ |
| public JarOutputStream(OutputStream out, Manifest man) throws IOException { |
| super(out); |
| if (man == null) { |
| throw new NullPointerException("man"); |
| } |
| ZipEntry e = new ZipEntry(JarFile.MANIFEST_NAME); |
| putNextEntry(e); |
| man.write(new BufferedOutputStream(this)); |
| closeEntry(); |
| } |
| |
| /** |
| * Creates a new <code>JarOutputStream</code> with no manifest. |
| * @param out the actual output stream |
| * @exception IOException if an I/O error has occurred |
| */ |
| public JarOutputStream(OutputStream out) throws IOException { |
| super(out); |
| } |
| |
| /** |
| * Begins writing a new JAR file entry and positions the stream |
| * to the start of the entry data. This method will also close |
| * any previous entry. The default compression method will be |
| * used if no compression method was specified for the entry. |
| * The current time will be used if the entry has no set modification |
| * time. |
| * |
| * @param ze the ZIP/JAR entry to be written |
| * @exception ZipException if a ZIP error has occurred |
| * @exception IOException if an I/O error has occurred |
| */ |
| public void putNextEntry(ZipEntry ze) throws IOException { |
| if (firstEntry) { |
| // Make sure that extra field data for first JAR |
| // entry includes JAR magic number id. |
| byte[] edata = ze.getExtra(); |
| if (edata == null || !hasMagic(edata)) { |
| if (edata == null) { |
| edata = new byte[4]; |
| } else { |
| // Prepend magic to existing extra data |
| byte[] tmp = new byte[edata.length + 4]; |
| System.arraycopy(edata, 0, tmp, 4, edata.length); |
| edata = tmp; |
| } |
| set16(edata, 0, JAR_MAGIC); // extra field id |
| set16(edata, 2, 0); // extra field size |
| ze.setExtra(edata); |
| } |
| firstEntry = false; |
| } |
| super.putNextEntry(ze); |
| } |
| |
| private boolean firstEntry = true; |
| |
| /* |
| * Returns true if specified byte array contains the |
| * jar magic extra field id. |
| */ |
| private static boolean hasMagic(byte[] edata) { |
| try { |
| int i = 0; |
| while (i < edata.length) { |
| if (get16(edata, i) == JAR_MAGIC) { |
| return true; |
| } |
| i += get16(edata, i + 2) + 4; |
| } |
| } catch (ArrayIndexOutOfBoundsException e) { |
| // Invalid extra field data |
| } |
| return false; |
| } |
| |
| /* |
| * Fetches unsigned 16-bit value from byte array at specified offset. |
| * The bytes are assumed to be in Intel (little-endian) byte order. |
| */ |
| private static int get16(byte[] b, int off) { |
| return (b[off] & 0xff) | ((b[off+1] & 0xff) << 8); |
| } |
| |
| /* |
| * Sets 16-bit value at specified offset. The bytes are assumed to |
| * be in Intel (little-endian) byte order. |
| */ |
| private static void set16(byte[] b, int off, int value) { |
| b[off+0] = (byte)value; |
| b[off+1] = (byte)(value >> 8); |
| } |
| } |