Source Code Cross Referenced for DeflaterOutputStream.java in  » 6.0-JDK-Core » Collections-Jar-Zip-Logging-regex » java » util » zip » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Core » Collections Jar Zip Logging regex » java.util.zip 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001        /*
002         * Copyright 1996-2006 Sun Microsystems, Inc.  All Rights Reserved.
003         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004         *
005         * This code is free software; you can redistribute it and/or modify it
006         * under the terms of the GNU General Public License version 2 only, as
007         * published by the Free Software Foundation.  Sun designates this
008         * particular file as subject to the "Classpath" exception as provided
009         * by Sun in the LICENSE file that accompanied this code.
010         *
011         * This code is distributed in the hope that it will be useful, but WITHOUT
012         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013         * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014         * version 2 for more details (a copy is included in the LICENSE file that
015         * accompanied this code).
016         *
017         * You should have received a copy of the GNU General Public License version
018         * 2 along with this work; if not, write to the Free Software Foundation,
019         * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020         *
021         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022         * CA 95054 USA or visit www.sun.com if you need additional information or
023         * have any questions.
024         */
025
026        package java.util.zip;
027
028        import java.io.FilterOutputStream;
029        import java.io.OutputStream;
030        import java.io.InputStream;
031        import java.io.IOException;
032
033        /**
034         * This class implements an output stream filter for compressing data in
035         * the "deflate" compression format. It is also used as the basis for other
036         * types of compression filters, such as GZIPOutputStream.
037         *
038         * @see		Deflater
039         * @version 	1.42, 05/05/07
040         * @author 	David Connelly
041         */
042        public class DeflaterOutputStream extends FilterOutputStream {
043            /**
044             * Compressor for this stream.
045             */
046            protected Deflater def;
047
048            /**
049             * Output buffer for writing compressed data.
050             */
051            protected byte[] buf;
052
053            /**
054             * Indicates that the stream has been closed.
055             */
056
057            private boolean closed = false;
058
059            /**
060             * Creates a new output stream with the specified compressor and
061             * buffer size.
062             * @param out the output stream
063             * @param def the compressor ("deflater")
064             * @param size the output buffer size
065             * @exception IllegalArgumentException if size is <= 0
066             */
067            public DeflaterOutputStream(OutputStream out, Deflater def, int size) {
068                super (out);
069                if (out == null || def == null) {
070                    throw new NullPointerException();
071                } else if (size <= 0) {
072                    throw new IllegalArgumentException("buffer size <= 0");
073                }
074                this .def = def;
075                buf = new byte[size];
076            }
077
078            /**
079             * Creates a new output stream with the specified compressor and
080             * a default buffer size.
081             * @param out the output stream
082             * @param def the compressor ("deflater")
083             */
084            public DeflaterOutputStream(OutputStream out, Deflater def) {
085                this (out, def, 512);
086            }
087
088            boolean usesDefaultDeflater = false;
089
090            /**
091             * Creates a new output stream with a default compressor and buffer size.
092             * @param out the output stream
093             */
094            public DeflaterOutputStream(OutputStream out) {
095                this (out, new Deflater());
096                usesDefaultDeflater = true;
097            }
098
099            /**
100             * Writes a byte to the compressed output stream. This method will
101             * block until the byte can be written.
102             * @param b the byte to be written
103             * @exception IOException if an I/O error has occurred
104             */
105            public void write(int b) throws IOException {
106                byte[] buf = new byte[1];
107                buf[0] = (byte) (b & 0xff);
108                write(buf, 0, 1);
109            }
110
111            /**
112             * Writes an array of bytes to the compressed output stream. This
113             * method will block until all the bytes are written.
114             * @param b the data to be written
115             * @param off the start offset of the data
116             * @param len the length of the data
117             * @exception IOException if an I/O error has occurred
118             */
119            public void write(byte[] b, int off, int len) throws IOException {
120                if (def.finished()) {
121                    throw new IOException("write beyond end of stream");
122                }
123                if ((off | len | (off + len) | (b.length - (off + len))) < 0) {
124                    throw new IndexOutOfBoundsException();
125                } else if (len == 0) {
126                    return;
127                }
128                if (!def.finished()) {
129                    // Deflate no more than stride bytes at a time.  This avoids
130                    // excess copying in deflateBytes (see Deflater.c)
131                    int stride = buf.length;
132                    for (int i = 0; i < len; i += stride) {
133                        def.setInput(b, off + i, Math.min(stride, len - i));
134                        while (!def.needsInput()) {
135                            deflate();
136                        }
137                    }
138                }
139            }
140
141            /**
142             * Finishes writing compressed data to the output stream without closing
143             * the underlying stream. Use this method when applying multiple filters
144             * in succession to the same output stream.
145             * @exception IOException if an I/O error has occurred
146             */
147            public void finish() throws IOException {
148                if (!def.finished()) {
149                    def.finish();
150                    while (!def.finished()) {
151                        deflate();
152                    }
153                }
154            }
155
156            /**
157             * Writes remaining compressed data to the output stream and closes the
158             * underlying stream.
159             * @exception IOException if an I/O error has occurred
160             */
161            public void close() throws IOException {
162                if (!closed) {
163                    finish();
164                    if (usesDefaultDeflater)
165                        def.end();
166                    out.close();
167                    closed = true;
168                }
169            }
170
171            /**
172             * Writes next block of compressed data to the output stream.
173             * @throws IOException if an I/O error has occurred
174             */
175            protected void deflate() throws IOException {
176                int len = def.deflate(buf, 0, buf.length);
177                if (len > 0) {
178                    out.write(buf, 0, len);
179                }
180            }
181        }
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