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145 lines
3.7 KiB
Java
145 lines
3.7 KiB
Java
/* DeflaterOutputStream.java - Output filter for compressing.
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Copyright (C) 1999, 2000 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.util.zip;
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import java.io.FilterOutputStream;
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import java.io.OutputStream;
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import java.io.IOException;
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/**
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* @author Tom Tromey
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* @date May 17, 1999
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*/
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/* Written using on-line Java Platform 1.2 API Specification
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* and JCL book.
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* Believed complete and correct.
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*/
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public class DeflaterOutputStream extends FilterOutputStream
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{
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public void close () throws IOException
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{
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finish ();
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out.close();
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}
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protected void deflate () throws IOException
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{
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do
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{
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int len = def.deflate(buf, 0, buf.length);
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if (len > 0)
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out.write(buf, 0, len);
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}
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while (! def.needsInput());
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}
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public DeflaterOutputStream (OutputStream out)
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{
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this (out, new Deflater (), 512);
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}
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public DeflaterOutputStream (OutputStream out, Deflater defl)
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{
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this (out, defl, 512);
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}
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public DeflaterOutputStream(OutputStream out, Deflater defl, int bufsize)
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{
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super (out);
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buf = new byte[bufsize];
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def = defl;
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}
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public void finish () throws IOException
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{
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if (inbufLength > 0)
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{
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def.setInput (inbuf, 0, inbufLength);
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deflate ();
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inbufLength = 0;
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}
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def.finish();
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while (! def.finished ())
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{
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int len = def.deflate(buf, 0, buf.length);
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if (len > 0)
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out.write(buf, 0, len);
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}
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}
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public void write (int bval) throws IOException
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{
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if (inbuf == null)
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{
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inbuf = new byte[128];
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}
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else if (inbufLength == inbuf.length)
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{
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def.setInput (inbuf, 0, inbufLength);
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deflate ();
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inbufLength = 0;
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}
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inbuf[inbufLength++] = (byte) bval;
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}
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public void write (byte[] buf, int off, int len) throws IOException
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{
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if (inbufLength > 0)
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{
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def.setInput (inbuf, 0, inbufLength);
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deflate ();
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inbufLength = 0;
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}
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def.setInput (buf, off, len);
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deflate ();
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}
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// Used, if needed, for write(int).
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private byte[] inbuf;
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// Used length of inbuf.
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private int inbufLength;
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// The retrieval buffer.
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protected byte[] buf;
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// Deflater used to compress data.
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protected Deflater def;
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}
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