| /* DeflaterOutputStream.java - Output filter for compressing. |
| Copyright (C) 1999, 2000, 2001, 2004, 2005 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.zip; |
| |
| import java.io.FilterOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| /* Written using on-line Java Platform 1.2 API Specification |
| * and JCL book. |
| * Believed complete and correct. |
| */ |
| |
| /** |
| * This is a special FilterOutputStream deflating the bytes that are |
| * written through it. It uses the Deflater for deflating. |
| * |
| * A special thing to be noted is that flush() doesn't flush |
| * everything in Sun's JDK, but it does so in jazzlib. This is because |
| * Sun's Deflater doesn't have a way to flush() everything, without |
| * finishing the stream. |
| * |
| * @author Tom Tromey, Jochen Hoenicke |
| * @date Jan 11, 2001 |
| */ |
| public class DeflaterOutputStream extends FilterOutputStream |
| { |
| /** |
| * This buffer is used temporarily to retrieve the bytes from the |
| * deflater and write them to the underlying output stream. |
| */ |
| protected byte[] buf; |
| |
| /** |
| * The deflater which is used to deflate the stream. |
| */ |
| protected Deflater def; |
| |
| /** |
| * Deflates everything in the def's input buffers. This will call |
| * <code>def.deflate()</code> until all bytes from the input buffers |
| * are processed. |
| */ |
| protected void deflate() throws IOException |
| { |
| while (! def.needsInput()) |
| { |
| int len = def.deflate(buf, 0, buf.length); |
| |
| // System.err.println("DOS deflated " + len + " out of " + buf.length); |
| if (len <= 0) |
| break; |
| out.write(buf, 0, len); |
| } |
| |
| if (! def.needsInput()) |
| throw new InternalError("Can't deflate all input?"); |
| } |
| |
| /** |
| * Creates a new DeflaterOutputStream with a default Deflater and |
| * default buffer size. |
| * @param out the output stream where deflated output should be written. |
| */ |
| public DeflaterOutputStream(OutputStream out) |
| { |
| this(out, new Deflater(), 4096); |
| } |
| |
| /** |
| * Creates a new DeflaterOutputStream with the given Deflater and |
| * default buffer size. |
| * @param out the output stream where deflated output should be written. |
| * @param defl the underlying deflater. |
| */ |
| public DeflaterOutputStream(OutputStream out, Deflater defl) |
| { |
| this(out, defl, 4096); |
| } |
| |
| /** |
| * Creates a new DeflaterOutputStream with the given Deflater and |
| * buffer size. |
| * @param out the output stream where deflated output should be written. |
| * @param defl the underlying deflater. |
| * @param bufsize the buffer size. |
| * @exception IllegalArgumentException if bufsize isn't positive. |
| */ |
| public DeflaterOutputStream(OutputStream out, Deflater defl, int bufsize) |
| { |
| super(out); |
| if (bufsize <= 0) |
| throw new IllegalArgumentException("bufsize <= 0"); |
| buf = new byte[bufsize]; |
| def = defl; |
| } |
| |
| /** |
| * Flushes the stream by calling flush() on the deflater and then |
| * on the underlying stream. This ensures that all bytes are |
| * flushed. This function doesn't work in Sun's JDK, but only in |
| * jazzlib. |
| */ |
| public void flush() throws IOException |
| { |
| def.flush(); |
| deflate(); |
| out.flush(); |
| } |
| |
| /** |
| * Finishes the stream by calling finish() on the deflater. This |
| * was the only way to ensure that all bytes are flushed in Sun's |
| * JDK. |
| */ |
| public void finish() throws IOException |
| { |
| def.finish(); |
| while (! def.finished()) |
| { |
| int len = def.deflate(buf, 0, buf.length); |
| if (len <= 0) |
| break; |
| out.write(buf, 0, len); |
| } |
| if (! def.finished()) |
| throw new InternalError("Can't deflate all input?"); |
| out.flush(); |
| } |
| |
| /** |
| * Calls finish() and closes the stream. |
| */ |
| public void close() throws IOException |
| { |
| finish(); |
| out.close(); |
| } |
| |
| /** |
| * Writes a single byte to the compressed output stream. |
| * @param bval the byte value. |
| */ |
| public void write(int bval) throws IOException |
| { |
| byte[] b = new byte[1]; |
| b[0] = (byte) bval; |
| write(b, 0, 1); |
| } |
| |
| /** |
| * Writes a len bytes from an array to the compressed stream. |
| * @param buf the byte array. |
| * @param off the offset into the byte array where to start. |
| * @param len the number of bytes to write. |
| */ |
| public void write(byte[] buf, int off, int len) throws IOException |
| { |
| def.setInput(buf, off, len); |
| deflate(); |
| } |
| } |