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-/* Deflater.java - Compress a data stream
- Copyright (C) 1999, 2000, 2001, 2004, 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-package java.util.zip;
-
-import gnu.gcj.RawData;
-
-/**
- * This is the Deflater class. The deflater class compresses input
- * with the deflate algorithm described in RFC 1951. It has several
- * compression levels and three different strategies described below.
- *
- * This class is <i>not</i> thread safe. This is inherent in the API, due
- * to the split of deflate and setInput.
- *
- * @author Jochen Hoenicke
- * @author Tom Tromey
- */
-public class Deflater
-{
- /**
- * The best and slowest compression level. This tries to find very
- * long and distant string repetitions.
- */
- public static final int BEST_COMPRESSION = 9;
- /**
- * The worst but fastest compression level.
- */
- public static final int BEST_SPEED = 1;
- /**
- * The default compression level.
- */
- public static final int DEFAULT_COMPRESSION = -1;
- /**
- * This level won't compress at all but output uncompressed blocks.
- */
- public static final int NO_COMPRESSION = 0;
-
- /**
- * The default strategy.
- */
- public static final int DEFAULT_STRATEGY = 0;
- /**
- * This strategy will only allow longer string repetitions. It is
- * useful for random data with a small character set.
- */
- public static final int FILTERED = 1;
-
- /**
- * This strategy will not look for string repetitions at all. It
- * only encodes with Huffman trees (which means, that more common
- * characters get a smaller encoding.
- */
- public static final int HUFFMAN_ONLY = 2;
-
- /**
- * The compression method. This is the only method supported so far.
- * There is no need to use this constant at all.
- */
- public static final int DEFLATED = 8;
-
- /** 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;
-
- /**
- * Creates a new deflater with default compression level.
- */
- public Deflater()
- {
- this(DEFAULT_COMPRESSION, false);
- }
-
- /**
- * Creates a new deflater with given compression level.
- * @param lvl the compression level, a value between NO_COMPRESSION
- * and BEST_COMPRESSION, or DEFAULT_COMPRESSION.
- * @exception IllegalArgumentException if lvl is out of range.
- */
- public Deflater(int lvl)
- {
- this(lvl, false);
- }
-
- /**
- * Creates a new deflater with given compression level.
- * @param lvl the compression level, a value between NO_COMPRESSION
- * and BEST_COMPRESSION.
- * @param nowrap true, iff we should suppress the deflate header at the
- * beginning and the adler checksum at the end of the output. This is
- * useful for the GZIP format.
- * @exception IllegalArgumentException if lvl is out of range.
- */
- public Deflater(int lvl, boolean noHeader)
- {
- this.strategy = DEFAULT_STRATEGY;
- init(lvl, noHeader);
- setLevel(lvl);
- }
-
- private native void init(int level, boolean noHeader);
-
- private native void update();
-
- /**
- * Resets the deflater. The deflater acts afterwards as if it was
- * just created with the same compression level and strategy as it
- * had before.
- */
- public native void reset();
-
- /**
- * Frees all objects allocated by the compressor. There's no
- * reason to call this, since you can just rely on garbage
- * collection. Exists only for compatibility against Sun's JDK,
- * where the compressor allocates native memory.
- * If you call any method (even reset) afterwards the behaviour is
- * <i>undefined</i>.
- * @deprecated Just clear all references to deflater instead.
- */
- public native void end();
-
- /**
- * Gets the current adler checksum of the data that was processed so
- * far.
- */
- public native int getAdler();
-
- /**
- * Gets the number of input bytes processed so far.
- */
- @Deprecated
- public int getTotalIn()
- {
- return (int) getBytesRead();
- }
-
- /**
- * Gets the number of input bytes processed so far.
- * @since 1.5
- */
- public native long getBytesRead();
-
- /**
- * Gets the number of output bytes so far.
- */
- @Deprecated
- public int getTotalOut()
- {
- return (int) getBytesWritten();
- }
-
- /**
- * Gets the number of output bytes so far.
- * @since 1.5
- */
- public native long getBytesWritten();
-
- /**
- * Finalizes this object.
- */
- protected void finalize()
- {
- end();
- }
-
- /**
- * Finishes the deflater with the current input block. It is an error
- * to give more input after this method was called. This method must
- * be called to force all bytes to be flushed.
- */
- public native void finish();
-
- /**
- * Returns true iff the stream was finished and no more output bytes
- * are available.
- */
- public synchronized boolean finished()
- {
- return is_finished;
- }
-
- /**
- * Returns true, if the input buffer is empty.
- * You should then call setInput(). <br>
- *
- * <em>NOTE</em>: This method can also return true when the stream
- * was finished.
- */
- public native boolean needsInput();
-
- /**
- * Sets the data which should be compressed next. This should be only
- * called when needsInput indicates that more input is needed.
- * If you call setInput when needsInput() returns false, the
- * previous input that is still pending will be thrown away.
- * The given byte array should not be changed, before needsInput() returns
- * true again.
- * This call is equivalent to <code>setInput(input, 0, input.length)</code>.
- * @param input the buffer containing the input data.
- * @exception IllegalStateException if the buffer was finished() or ended().
- */
- public void setInput(byte[] input)
- {
- setInput(input, 0, input.length);
- }
-
- /**
- * Sets the data which should be compressed next. This should be
- * only called when needsInput indicates that more input is needed.
- * The given byte array should not be changed, before needsInput() returns
- * true again.
- * @param input the buffer containing the input data.
- * @param off the start of the data.
- * @param len the length of the data.
- * @exception IllegalStateException if the buffer was finished() or ended()
- * or if previous input is still pending.
- */
- public native void setInput(byte[] input, int off, int len);
-
- /**
- * Sets the compression level. There is no guarantee of the exact
- * position of the change, but if you call this when needsInput is
- * true the change of compression level will occur somewhere near
- * before the end of the so far given input.
- * @param lvl the new compression level.
- */
- public synchronized void setLevel(int lvl)
- {
- if (lvl != -1 && (lvl < 0 || lvl > 9))
- throw new IllegalArgumentException();
- level = (lvl == -1) ? 6 : lvl;
- update();
- }
-
- /**
- * Sets the compression strategy. Strategy is one of
- * DEFAULT_STRATEGY, HUFFMAN_ONLY and FILTERED. For the exact
- * position where the strategy is changed, the same as for
- * setLevel() applies.
- * @param stgy the new compression strategy.
- */
- public synchronized void setStrategy(int stgy)
- {
- if (stgy != DEFAULT_STRATEGY && stgy != FILTERED
- && stgy != HUFFMAN_ONLY)
- throw new IllegalArgumentException();
- strategy = stgy;
- update();
- }
-
- /**
- * Deflates the current input block to the given array. It returns
- * the number of bytes compressed, or 0 if either
- * needsInput() or finished() returns true or length is zero.
- * @param output the buffer where to write the compressed data.
- */
- public int deflate(byte[] output)
- {
- return deflate(output, 0, output.length);
- }
-
- /**
- * Deflates the current input block to the given array. It returns
- * the number of bytes compressed, or 0 if either
- * needsInput() or finished() returns true or length is zero.
- * @param output the buffer where to write the compressed data.
- * @param offset the offset into the output array.
- * @param length the maximum number of bytes that may be written.
- * @exception IllegalStateException if end() was called.
- * @exception IndexOutOfBoundsException if offset and/or length
- * don't match the array length.
- */
- public native int deflate(byte[] output, int off, int len);
-
- /**
- * Sets the dictionary which should be used in the deflate process.
- * This call is equivalent to <code>setDictionary(dict, 0,
- * dict.length)</code>.
- * @param dict the dictionary.
- * @exception IllegalStateException if setInput () or deflate ()
- * were already called or another dictionary was already set.
- */
- public void setDictionary(byte[] dict)
- {
- setDictionary(dict, 0, dict.length);
- }
-
- /**
- * Sets the dictionary which should be used in the deflate process.
- * The dictionary should be a byte array containing strings that are
- * likely to occur in the data which should be compressed. The
- * dictionary is not stored in the compressed output, only a
- * checksum. To decompress the output you need to supply the same
- * dictionary again.
- * @param dict the dictionary.
- * @param offset an offset into the dictionary.
- * @param length the length of the dictionary.
- * @exception IllegalStateException if setInput () or deflate () were
- * already called or another dictionary was already set.
- */
- public native void setDictionary(byte[] buf, int off, int len);
-
- // Classpath's compression library supports flushing, but we
- // don't. So this is a no-op here.
- void flush()
- {
- }
-}