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‎LICENSE

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Apache License
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Version 2.0, January 2004
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http://www.apache.org/licenses/
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‎README

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# LZMA library for Java #
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## Background ##
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This library is based on the Java LZMA SDK by Igor Pavlov at http://www.7-zip.org/sdk.html.
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While the code works just fine, any potential user will quickly realize that:
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* this is a straight port of non-object procedural code written in C to Java, and
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* the code does not follow Java conventions (e.g., methods names start by
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capital letters)
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* configuration of the LZMA encoder and decoders require passing around
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arrays and numbers for which no documentation or constants is available, and
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* ...there is no stream api to plug into java.io streams.
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There is unfortunately no public description of the LZMA algorithms, so a
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rewrite was clearly a hard task. I decided to create this library as follows.
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1. Import the Java LZMA SDK code.
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2. Convert methods and package names to Java conventions.
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3. Reformat the code and organize imports.
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4. Remove the useless (at least in a library) command-line interface classes.
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5. Run static code analysis to clean the code (unused variables, unusued parameters,
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unused methods, expressions simplifications and more).
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6. Do some profiling.
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7. Build a streaming api that would fit into java.io streams.
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Although not a derivate work, the streaming api classes were inspired from the work
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of Christopher League at http://contrapunctus.net/league/haques/lzmajio/. I reused
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his technique of fake streams and working threads to pass the data around between
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encoders/decoders and "normal" Java streams.
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## License ##
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The LZMA SDK is in the public domain. I relicensed the whole under the liberal
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Apache License Version 2.0: http://www.apache.org/licenses/LICENSE-2.0
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## Contact ##
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* <[email protected]>
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* http://julien.ponge.info/
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The code, downloads and issue trackers are made available from GitHub at
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http://github.com/jponge/lzma-java. Do not hesitate to contribute by forking
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and asking for pulls!

‎pom.xml

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<?xml version="1.0"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>lzma-java</groupId>
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<artifactId>lzma-java</artifactId>
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<packaging>jar</packaging>
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<version>0.9-SNAPSHOT</version>
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<name>LZMA library for Java</name>
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<url>http://github.com/jponge/lzma-java</url>
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<dependencies/>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>1.5</source>
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<target>1.5</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎src/main/java/lzma/sdk/CRC.java

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/*
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* Copyright (c) 2009 Julien Ponge. All rights reserved.
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*
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* <[email protected]>
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* http://julien.ponge.info/
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This work is based on the LZMA SDK by Igor Pavlov.
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* The LZMA SDK is placed under the public domain, and can be obtained from
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*
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* http://www.7-zip.org/sdk.html
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*
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* The LzmaInputStream and LzmaOutputStream classes were inspired by the
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* work of Christopher League, although they are not derivative works.
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*
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* http://contrapunctus.net/league/haques/lzmajio/
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*/
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package lzma.sdk;
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public class CRC
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{
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static public int[] Table = new int[256];
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static
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{
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for (int i = 0; i < 256; i++)
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{
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int r = i;
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for (int j = 0; j < 8; j++)
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{
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if ((r & 1) != 0)
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{
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r = (r >>> 1) ^ 0xEDB88320;
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}
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else
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{
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r >>>= 1;
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}
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}
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Table[i] = r;
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}
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}
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int _value = -1;
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public void init()
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{
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_value = -1;
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}
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public void update(byte[] data, int offset, int size)
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{
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for (int i = 0; i < size; i++)
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{
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_value = Table[(_value ^ data[offset + i]) & 0xFF] ^ (_value >>> 8);
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}
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}
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public void update(byte[] data)
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{
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int size = data.length;
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for (int i = 0; i < size; i++)
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{
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_value = Table[(_value ^ data[i]) & 0xFF] ^ (_value >>> 8);
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}
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}
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public void updateByte(int b)
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{
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_value = Table[(_value ^ b) & 0xFF] ^ (_value >>> 8);
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}
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public int getDigest()
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{
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return ~_value;
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}
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}

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