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rar decompression library in plain java
There is a newer version: 7.5.5
/*
 * Copyright (c) 2007 innoSysTec (R) GmbH, Germany. All rights reserved.
 * Original author: Edmund Wagner
 * Creation date: 31.05.2007
 *
 * Source: $HeadURL$
 * Last changed: $LastChangedDate$
 * 
 * the unrar licence applies to all junrar source and binary distributions 
 * you are not allowed to use this source to re-create the RAR compression algorithm
 * 
 * Here some html entities which can be used for escaping javadoc tags:
 * "&":  "&" or "&"
 * "<":  "<" or "<"
 * ">":  ">" or ">"
 * "@":  "@" 
 */
package com.github.junrar.unpack;

import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import com.github.junrar.Archive;
import com.github.junrar.UnrarCallback;
import com.github.junrar.Volume;
import com.github.junrar.crc.RarCRC;
import com.github.junrar.exception.RarException;
import com.github.junrar.exception.RarException.RarExceptionType;
import com.github.junrar.io.ReadOnlyAccessInputStream;
import com.github.junrar.rarfile.FileHeader;


/**
 * DOCUMENT ME
 * 
 * @author $LastChangedBy$
 * @version $LastChangedRevision$
 */
public class ComprDataIO {

	private final Archive archive;

	private long unpPackedSize;

	private boolean testMode;

	private boolean skipUnpCRC;

	private InputStream inputStream;

	private OutputStream outputStream;

	private FileHeader subHead;

	// cryptData Crypt;
	// cryptData Decrypt;
	private boolean packVolume;

	private boolean unpVolume;

	private boolean nextVolumeMissing;

	private long totalPackRead;

	private long unpArcSize;

	private long curPackRead, curPackWrite, curUnpRead, curUnpWrite;

	private long processedArcSize, totalArcSize;

	private long packFileCRC, unpFileCRC, packedCRC;

	private int encryption;

	private int decryption;


	public ComprDataIO(Archive arc) {
		this.archive = arc;
	}

	public void init(OutputStream outputStream) {
		this.outputStream = outputStream;
		unpPackedSize = 0;
		testMode = false;
		skipUnpCRC = false;
		packVolume = false;
		unpVolume = false;
		nextVolumeMissing = false;
		// command = null;
		encryption = 0;
		decryption = 0;
		totalPackRead = 0;
		curPackRead = curPackWrite = curUnpRead = curUnpWrite = 0;
		packFileCRC = unpFileCRC = packedCRC = 0xffffffff;
		subHead = null;
		processedArcSize = totalArcSize = 0;
	}

	public void init(FileHeader hd) throws IOException {
		long startPos = hd.getPositionInFile() + hd.getHeaderSize();
		unpPackedSize = hd.getFullPackSize();
		inputStream = new ReadOnlyAccessInputStream(archive.getRof(), startPos,
				startPos + unpPackedSize);
		subHead = hd;
		curUnpRead = 0;
		curPackWrite = 0;
		packedCRC = 0xFFffFFff;
	}

	public int unpRead(byte[] addr, int offset, int count) throws IOException,
			RarException {
		int retCode = 0, totalRead = 0;
		while (count > 0) {
			int readSize = (count > unpPackedSize) ? (int) unpPackedSize
					: count;
			retCode = inputStream.read(addr, offset, readSize);
			if (retCode < 0) {
				throw new EOFException();
			}
			if (subHead.isSplitAfter()) {
				packedCRC = RarCRC.checkCrc((int) packedCRC, addr, offset,
						retCode);
			}

			curUnpRead += retCode;
			totalRead += retCode;
			offset += retCode;
			count -= retCode;
			unpPackedSize -= retCode;
			archive.bytesReadRead(retCode);
			if (unpPackedSize == 0 && subHead.isSplitAfter()) {
				Volume nextVolume = archive.getVolumeManager().nextArchive(
						archive, archive.getVolume());
				if (nextVolume == null) {
					nextVolumeMissing = true;
					return -1;
				}

				FileHeader hd = this.getSubHeader();
				if (hd.getUnpVersion() >= 20 && hd.getFileCRC() != 0xffffffff
						&& this.getPackedCRC() != ~hd.getFileCRC()) {
					throw new RarException(RarExceptionType.crcError);
				}
				UnrarCallback callback = archive.getUnrarCallback();
				if ((callback != null)
						&& !callback.isNextVolumeReady(nextVolume)) {
					return -1;
				}
				archive.setVolume(nextVolume);
				hd = archive.nextFileHeader();
				if (hd == null) {
					return -1;
				}
				this.init(hd);
			} else {
				break;
			}
		}

		if (retCode != -1) {
			retCode = totalRead;
		}
		return retCode;

	}

	public void unpWrite(byte[] addr, int offset, int count) throws IOException {
		if (!testMode) {
			// DestFile->Write(Addr,Count);
			outputStream.write(addr, offset, count);
		}

		curUnpWrite += count;

		if (!skipUnpCRC) {
			if (archive.isOldFormat()) {
				unpFileCRC = RarCRC
						.checkOldCrc((short) unpFileCRC, addr, count);
			} else {
				unpFileCRC = RarCRC.checkCrc((int) unpFileCRC, addr, offset,
						count);
			}
		}
		// if (!skipArcCRC) {
		// archive.updateDataCRC(Addr, offset, ReadSize);
		// }
	}

	public void setPackedSizeToRead(long size) {
		unpPackedSize = size;
	}

	public void setTestMode(boolean mode) {
		testMode = mode;
	}

	public void setSkipUnpCRC(boolean skip) {
		skipUnpCRC = skip;
	}

	public void setSubHeader(FileHeader hd) {
		subHead = hd;

	}

	public long getCurPackRead() {
		return curPackRead;
	}

	public void setCurPackRead(long curPackRead) {
		this.curPackRead = curPackRead;
	}

	public long getCurPackWrite() {
		return curPackWrite;
	}

	public void setCurPackWrite(long curPackWrite) {
		this.curPackWrite = curPackWrite;
	}

	public long getCurUnpRead() {
		return curUnpRead;
	}

	public void setCurUnpRead(long curUnpRead) {
		this.curUnpRead = curUnpRead;
	}

	public long getCurUnpWrite() {
		return curUnpWrite;
	}

	public void setCurUnpWrite(long curUnpWrite) {
		this.curUnpWrite = curUnpWrite;
	}

	public int getDecryption() {
		return decryption;
	}

	public void setDecryption(int decryption) {
		this.decryption = decryption;
	}

	public int getEncryption() {
		return encryption;
	}

	public void setEncryption(int encryption) {
		this.encryption = encryption;
	}

	public boolean isNextVolumeMissing() {
		return nextVolumeMissing;
	}

	public void setNextVolumeMissing(boolean nextVolumeMissing) {
		this.nextVolumeMissing = nextVolumeMissing;
	}

	public long getPackedCRC() {
		return packedCRC;
	}

	public void setPackedCRC(long packedCRC) {
		this.packedCRC = packedCRC;
	}

	public long getPackFileCRC() {
		return packFileCRC;
	}

	public void setPackFileCRC(long packFileCRC) {
		this.packFileCRC = packFileCRC;
	}

	public boolean isPackVolume() {
		return packVolume;
	}

	public void setPackVolume(boolean packVolume) {
		this.packVolume = packVolume;
	}

	public long getProcessedArcSize() {
		return processedArcSize;
	}

	public void setProcessedArcSize(long processedArcSize) {
		this.processedArcSize = processedArcSize;
	}

	public long getTotalArcSize() {
		return totalArcSize;
	}

	public void setTotalArcSize(long totalArcSize) {
		this.totalArcSize = totalArcSize;
	}

	public long getTotalPackRead() {
		return totalPackRead;
	}

	public void setTotalPackRead(long totalPackRead) {
		this.totalPackRead = totalPackRead;
	}

	public long getUnpArcSize() {
		return unpArcSize;
	}

	public void setUnpArcSize(long unpArcSize) {
		this.unpArcSize = unpArcSize;
	}

	public long getUnpFileCRC() {
		return unpFileCRC;
	}

	public void setUnpFileCRC(long unpFileCRC) {
		this.unpFileCRC = unpFileCRC;
	}

	public boolean isUnpVolume() {
		return unpVolume;
	}

	public void setUnpVolume(boolean unpVolume) {
		this.unpVolume = unpVolume;
	}

	public FileHeader getSubHeader() {
		return subHead;
	}

	// public void setEncryption(int method, char[] Password, byte[] Salt,
	// boolean encrypt, boolean handsOffHash)
	// {
	//
	// }
	//
	// public void setAV15Encryption()
	// {
	//
	// }
	//
	// public void setCmt13Encryption()
	// {
	//
	// }
}