Source Code Cross Referenced for JarOutputStream.java in  » 6.0-JDK-Modules » j2me » java » util » jar » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.util.jar 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)JarOutputStream.java	1.26 06/10/10
003:         *
004:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.  
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER  
006:         *   
007:         * This program is free software; you can redistribute it and/or  
008:         * modify it under the terms of the GNU General Public License version  
009:         * 2 only, as published by the Free Software Foundation.   
010:         *   
011:         * This program is distributed in the hope that it will be useful, but  
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of  
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  
014:         * General Public License version 2 for more details (a copy is  
015:         * included at /legal/license.txt).   
016:         *   
017:         * You should have received a copy of the GNU General Public License  
018:         * version 2 along with this work; if not, write to the Free Software  
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  
020:         * 02110-1301 USA   
021:         *   
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa  
023:         * Clara, CA 95054 or visit www.sun.com if you need additional  
024:         * information or have any questions. 
025:         *
026:         */
027:
028:        package java.util.jar;
029:
030:        import java.util.zip.*;
031:        import java.io.*;
032:
033:        /**
034:         * The <code>JarOutputStream</code> class is used to write the contents
035:         * of a JAR file to any output stream. It extends the class
036:         * <code>java.util.zip.ZipOutputStream</code> with support
037:         * for writing an optional <code>Manifest</code> entry. The
038:         * <code>Manifest</code> can be used to specify meta-information about
039:         * the JAR file and its entries.
040:         *
041:         * @author  David Connelly
042:         * @version 1.19, 02/02/00
043:         * @see	    Manifest
044:         * @see	    java.util.zip.ZipOutputStream
045:         * @since   1.2
046:         */
047:        public class JarOutputStream extends ZipOutputStream {
048:            private static final int JAR_MAGIC = 0xCAFE;
049:
050:            /**
051:             * Creates a new <code>JarOutputStream</code> with the specified
052:             * <code>Manifest</code>. The manifest is written as the first
053:             * entry to the output stream.
054:             *
055:             * @param out the actual output stream
056:             * @param man the optional <code>Manifest</code>
057:             * @exception IOException if an I/O error has occurred
058:             */
059:            public JarOutputStream(OutputStream out, Manifest man)
060:                    throws IOException {
061:                super (out);
062:                if (man == null) {
063:                    throw new NullPointerException("man");
064:                }
065:                ZipEntry e = new ZipEntry(JarFile.MANIFEST_NAME);
066:                putNextEntry(e);
067:                man.write(new BufferedOutputStream(this ));
068:                closeEntry();
069:            }
070:
071:            /**
072:             * Creates a new <code>JarOutputStream</code> with no manifest.
073:             * @param out the actual output stream
074:             * @exception IOException if an I/O error has occurred
075:             */
076:            public JarOutputStream(OutputStream out) throws IOException {
077:                super (out);
078:            }
079:
080:            /**
081:             * Begins writing a new JAR file entry and positions the stream
082:             * to the start of the entry data. This method will also close
083:             * any previous entry. The default compression method will be
084:             * used if no compression method was specified for the entry.
085:             * The current time will be used if the entry has no set modification
086:             * time.
087:             *
088:             * @param ze the ZIP/JAR entry to be written
089:             * @exception ZipException if a ZIP error has occurred
090:             * @exception IOException if an I/O error has occurred
091:             */
092:            public void putNextEntry(ZipEntry ze) throws IOException {
093:                if (firstEntry) {
094:                    // Make sure that extra field data for first JAR
095:                    // entry includes JAR magic number id.
096:                    byte[] edata = ze.getExtra();
097:                    if (edata != null && !hasMagic(edata)) {
098:                        // Prepend magic to existing extra data
099:                        byte[] tmp = new byte[edata.length + 4];
100:                        System.arraycopy(tmp, 4, edata, 0, edata.length);
101:                        edata = tmp;
102:                    } else {
103:                        edata = new byte[4];
104:                    }
105:                    set16(edata, 0, JAR_MAGIC); // extra field id
106:                    set16(edata, 2, 0); // extra field size
107:                    ze.setExtra(edata);
108:                    firstEntry = false;
109:                }
110:                super .putNextEntry(ze);
111:            }
112:
113:            private boolean firstEntry = true;
114:
115:            /*
116:             * Returns true if specified byte array contains the
117:             * jar magic extra field id.
118:             */
119:            private static boolean hasMagic(byte[] edata) {
120:                try {
121:                    int i = 0;
122:                    while (i < edata.length) {
123:                        if (get16(edata, i) == JAR_MAGIC) {
124:                            return true;
125:                        }
126:                        i += get16(edata, i + 2) + 4;
127:                    }
128:                } catch (ArrayIndexOutOfBoundsException e) {
129:                    // Invalid extra field data
130:                }
131:                return false;
132:            }
133:
134:            /*
135:             * Fetches unsigned 16-bit value from byte array at specified offset.
136:             * The bytes are assumed to be in little-endian byte order.
137:             */
138:            private static int get16(byte[] b, int off) {
139:                return (b[off] & 0xff) | ((b[off + 1] & 0xff) << 8);
140:            }
141:
142:            /*
143:             * Sets 16-bit value at specified offset. The bytes are assumed to
144:             * be in little-endian byte order.
145:             */
146:            private static void set16(byte[] b, int off, int value) {
147:                b[off + 0] = (byte) value;
148:                b[off + 1] = (byte) (value >> 8);
149:            }
150:        }
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