/**************************************************************************
* Copyright (c) 2001 by Punch Telematix. All rights reserved. *
* *
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* modification, are permitted provided that the following conditions *
* are met: *
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* notice, this list of conditions and the following disclaimer. *
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* notice, this list of conditions and the following disclaimer in the *
* documentation and/or other materials provided with the distribution. *
* 3. Neither the name of Punch Telematix nor the names of *
* other contributors may be used to endorse or promote products *
* derived from this software without specific prior written permission.*
* *
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED *
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
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**************************************************************************/
/**
* $Id: DeflaterOutputStream.java,v 1.2 2006/10/04 14:24:15 cvsroot Exp $
*/
package java.util.zip;
import java.io.FilterOutputStream;
import java.io.OutputStream;
import java.io.IOException;
/**
* basic OutputStream for Deflating (compressing) data. <br>
* <br>
* read the {@link Deflater} class documentation for more info !
*/
public class DeflaterOutputStream extends FilterOutputStream {
protected byte [] buf;
protected Deflater def;
private boolean finished=false;
public DeflaterOutputStream(OutputStream out) {
this(out, new Deflater(),512);
}
public DeflaterOutputStream(OutputStream out, Deflater defl) {
this(out, defl, 512);
}
public DeflaterOutputStream(OutputStream out, Deflater defl, int bufsize) {
super(out);
if (defl == null) {
throw new NullPointerException();
}
def = defl;
buf = new byte[bufsize];
}
protected void deflate() throws IOException{
if (finished) {
throw new IOException("stream has finished");
}
int used=0;
int size=buf.length;
while (! def.needsInput()) {
if (size == used) {
out.write(buf, 0, size);
used=0;
}
used += def.deflate(buf, used, size - used);
}
out.write(buf, 0, used);
used=0;
}
public void close() throws IOException {
finish();
out.close();
}
public void finish() throws IOException {
if (!finished) {
def.finish();
deflate();
finished = true;
}
}
public void write(int bval) throws IOException {
byte [] b = new byte[1];
b[0] = (byte) bval;
write(b, 0, 1);
}
public void write(byte [] buffer, int offset, int len) throws IOException {
if (offset < 0 || len < 0 || buffer.length - len < offset ) {
throw new IndexOutOfBoundsException();
}
deflate();
def.setInput(buffer, offset, len);
}
}