146 lines
3.6 KiB
Java
146 lines
3.6 KiB
Java
/* Deflater.java - Compress a data stream
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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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As a special exception, if you link this library with other files to
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produce an executable, this library does not by itself cause the
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resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why the
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executable file might be covered by the GNU General Public License. */
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package java.util.zip;
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import gnu.gcj.RawData;
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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 Deflater
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{
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public static final int BEST_COMPRESSION = 9;
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public static final int BEST_SPEED = 1;
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public static final int DEFAULT_COMPRESSION = -1;
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public static final int NO_COMPRESSION = 0;
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public static final int DEFAULT_STRATEGY = 0;
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public static final int FILTERED = 1;
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public static final int HUFFMAN_ONLY = 2;
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public static final int DEFLATED = 8;
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public int deflate (byte[] buf)
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{
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return deflate (buf, 0, buf.length);
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}
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public native int deflate (byte[] buf, int off, int len);
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private native void init (int level, boolean noHeader);
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private native void update ();
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public Deflater ()
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{
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this (DEFAULT_COMPRESSION, false);
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}
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public Deflater (int lvl)
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{
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this (lvl, false);
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}
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public Deflater (int lvl, boolean noHeader)
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{
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this.strategy = DEFAULT_STRATEGY;
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init (lvl, noHeader);
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setLevel (lvl);
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}
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public native void end ();
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protected void finalize ()
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{
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end ();
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}
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public native void finish ();
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public synchronized boolean finished ()
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{
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return is_finished;
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}
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public native int getAdler ();
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public native int getTotalIn ();
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public native int getTotalOut ();
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public native boolean needsInput ();
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public native void reset ();
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public void setDictionary (byte[] buf)
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{
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setDictionary (buf, 0, buf.length);
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}
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public native void setDictionary (byte[] buf, int off, int len);
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public void setInput (byte[] buf)
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{
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setInput (buf, 0, buf.length);
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}
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public native void setInput (byte[] buf, int off, int len);
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public synchronized void setLevel (int lvl)
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{
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if (lvl != -1 && (lvl < 0 || lvl > 9))
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throw new IllegalArgumentException ();
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level = (lvl == -1) ? 6 : lvl;
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update ();
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}
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public synchronized void setStrategy (int stgy)
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{
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if (stgy != DEFAULT_STRATEGY && stgy != FILTERED
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&& stgy != HUFFMAN_ONLY)
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throw new IllegalArgumentException ();
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strategy = stgy;
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update ();
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}
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// Compression level.
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private int level;
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// Compression strategy.
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private int strategy;
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// The zlib stream.
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private RawData zstream;
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// True if finished.
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private boolean is_finished;
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// `Flush' flag to pass to next call to deflate.
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private int flush_flag;
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}
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