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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/javax/crypto/assembly/DeflateTransformer.java | |
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Diffstat (limited to 'libjava/classpath/gnu/javax/crypto/assembly/DeflateTransformer.java')
-rw-r--r-- | libjava/classpath/gnu/javax/crypto/assembly/DeflateTransformer.java | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/crypto/assembly/DeflateTransformer.java b/libjava/classpath/gnu/javax/crypto/assembly/DeflateTransformer.java new file mode 100644 index 000000000..97f9f0365 --- /dev/null +++ b/libjava/classpath/gnu/javax/crypto/assembly/DeflateTransformer.java @@ -0,0 +1,177 @@ +/* DeflateTransformer.java -- + Copyright (C) 2003, 2006 Free Software Foundation, Inc. + +This file is a 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 of the License, 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; if not, write to the Free Software +Foundation, Inc., 51 Franklin St, 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 gnu.javax.crypto.assembly; + +import java.util.Map; +import java.util.zip.DataFormatException; +import java.util.zip.Deflater; +import java.util.zip.Inflater; + +/** + * A {@link Transformer} Adapter allowing inclusion of a DEFLATE compression + * algorithm in an {@link Assembly} chain. The {@link Direction#FORWARD} + * transformation is a compression (deflate) of input data, while the + * {@link Direction#REVERSED} one is a decompression (inflate) that restores the + * original data. + * <p> + * This {@link Transformer} uses a {@link Deflater} instance to carry on the + * compression, and an {@link Inflater} to do the decompression. + * <p> + * When using such a {@link Transformer}, in an {@link Assembly}, there must + * be at least one element behind this instance in the constructed chain; + * otherwise, a {@link TransformerException} is thrown at initialisation time. + */ +class DeflateTransformer + extends Transformer +{ + private Deflater compressor; + + private Inflater decompressor; + + private int outputBlockSize = 512; // default zlib buffer size + + private byte[] zlibBuffer; + + DeflateTransformer() + { + super(); + + } + + void initDelegate(Map attributes) throws TransformerException + { + if (tail == null) + { + IllegalStateException cause = new IllegalStateException( + "Compression transformer missing its tail!"); + throw new TransformerException("initDelegate()", cause); + } + outputBlockSize = tail.currentBlockSize(); + zlibBuffer = new byte[outputBlockSize]; + Direction flow = (Direction) attributes.get(DIRECTION); + if (flow == Direction.FORWARD) + compressor = new Deflater(); + else + decompressor = new Inflater(); + } + + int delegateBlockSize() + { + return 1; + } + + void resetDelegate() + { + compressor = null; + decompressor = null; + outputBlockSize = 1; + zlibBuffer = null; + } + + byte[] updateDelegate(byte[] in, int offset, int length) + throws TransformerException + { + byte[] result; + if (wired == Direction.FORWARD) + { + compressor.setInput(in, offset, length); + while (! compressor.needsInput()) + compress(); + } + else // decompression: inflate first and then update tail + decompress(in, offset, length); + result = inBuffer.toByteArray(); + inBuffer.reset(); + return result; + } + + byte[] lastUpdateDelegate() throws TransformerException + { + // process multiples of blocksize as much as possible + if (wired == Direction.FORWARD) // compressing + { + if (! compressor.finished()) + { + compressor.finish(); + while (! compressor.finished()) + compress(); + } + } + else // decompressing + { + if (! decompressor.finished()) + { + IllegalStateException cause = new IllegalStateException( + "Compression transformer, after last update, must be finished " + + "but isn't"); + throw new TransformerException("lastUpdateDelegate()", cause); + } + } + byte[] result = inBuffer.toByteArray(); + inBuffer.reset(); + return result; + } + + private void compress() + { + int len = compressor.deflate(zlibBuffer); + if (len > 0) + inBuffer.write(zlibBuffer, 0, len); + } + + private void decompress(byte[] in, int offset, int length) + throws TransformerException + { + decompressor.setInput(in, offset, length); + int len = 1; + while (len > 0) + { + try + { + len = decompressor.inflate(zlibBuffer); + } + catch (DataFormatException x) + { + throw new TransformerException("decompress()", x); + } + if (len > 0) + inBuffer.write(zlibBuffer, 0, len); + } + } +} |