| /* Deflater.java - Compress a data stream |
| Copyright (C) 1999, 2000 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., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. |
| |
| As a special exception, if you link this library with other files to |
| produce an executable, this library does not by itself cause the |
| resulting executable to be covered by the GNU General Public License. |
| This exception does not however invalidate any other reasons why the |
| executable file might be covered by the GNU General Public License. */ |
| |
| 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); |
| private native void init (int level, boolean noHeader); |
| private 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; |
| } |