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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()
+  {
+  }
+}