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// Deflater.java - Compress a data stream.
/* Copyright (C) 1999 Cygnus Solutions
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package java.util.zip;
import gnu.gcj.RawData;
/**
* @author Tom Tromey
* @date May 17, 1999
*/
/* Written using on-line Java Platform 1.2 API Specification
* and JCL book.
* Believed complete and correct.
*/
public class Deflater
{
public static final int BEST_COMPRESSION = 9;
public static final int BEST_SPEED = 1;
public static final int DEFAULT_COMPRESSION = -1;
public static final int NO_COMPRESSION = 0;
public static final int DEFAULT_STRATEGY = 0;
public static final int FILTERED = 1;
public static final int HUFFMAN_ONLY = 2;
public static final int DEFLATED = 8;
public int deflate (byte[] buf)
{
return deflate (buf, 0, buf.length);
}
public native int deflate (byte[] buf, int off, int len);
public native void init (int level, boolean noHeader);
public native void update ();
public Deflater ()
{
this (DEFAULT_COMPRESSION, false);
}
public Deflater (int lvl)
{
this (lvl, false);
}
public Deflater (int lvl, boolean noHeader)
{
this.strategy = DEFAULT_STRATEGY;
init (lvl, noHeader);
setLevel (lvl);
}
public native void end ();
protected void finalize ()
{
end ();
}
public native void finish ();
public synchronized boolean finished ()
{
return is_finished;
}
public native int getAdler ();
public native int getTotalIn ();
public native int getTotalOut ();
public native boolean needsInput ();
public native void reset ();
public void setDictionary (byte[] buf)
{
setDictionary (buf, 0, buf.length);
}
public native void setDictionary (byte[] buf, int off, int len);
public void setInput (byte[] buf)
{
setInput (buf, 0, buf.length);
}
public native void setInput (byte[] buf, int off, int len);
public synchronized void setLevel (int lvl)
{
if (lvl != -1 && (lvl < 0 || lvl > 9))
throw new IllegalArgumentException ();
level = (lvl == -1) ? 6 : lvl;
update ();
}
public synchronized void setStrategy (int stgy)
{
if (stgy != DEFAULT_STRATEGY && stgy != FILTERED
&& stgy != HUFFMAN_ONLY)
throw new IllegalArgumentException ();
strategy = stgy;
update ();
}
// Compression level.
private int level;
// Compression strategy.
private int strategy;
// The zlib stream.
private RawData zstream;
// True if finished.
private boolean is_finished;
// `Flush' flag to pass to next call to deflate.
private int flush_flag;
}
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