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Diffstat (limited to 'libjava/java/util/zip/Deflater.java')
-rw-r--r-- | libjava/java/util/zip/Deflater.java | 354 |
1 files changed, 0 insertions, 354 deletions
diff --git a/libjava/java/util/zip/Deflater.java b/libjava/java/util/zip/Deflater.java deleted file mode 100644 index 47383ab..0000000 --- a/libjava/java/util/zip/Deflater.java +++ /dev/null @@ -1,354 +0,0 @@ -/* 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() - { - } -} |