iText 5 itextpdf.jar Source Code

itextpdf.jar is a component in iText 5 Java library to provide core functionalities. iText Java library allows you to generate and manage PDF documents.

The Source Code files are provided at iText GitHub site.

You can compile it to generate your JAR file, using pom.xml as the build configuration file.

The source code of itextpdf-5.5.14.jar is provided below:

✍: FYIcenter.com

com/itextpdf/text/pdf/LZWDecoder.java

/*
 * Copyright 2002-2008 by Paulo Soares.
 * 
 * This code was originally released in 2001 by SUN (see class
 * com.sun.media.imageioimpl.plugins.tiff.TIFFLZWDecompressor.java)
 * using the BSD license in a specific wording. In a mail dating from
 * January 23, 2008, Brian Burkhalter (@sun.com) gave us permission
 * to use the code under the following version of the BSD license:
 *
 * Copyright (c) 2005 Sun Microsystems, Inc. All  Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met: 
 * 
 * - Redistribution of source code must retain the above copyright 
 *   notice, this  list of conditions and the following disclaimer.
 * 
 * - Redistribution in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in 
 *   the documentation and/or other materials provided with the
 *   distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of 
 * contributors may be used to endorse or promote products derived 
 * from this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any 
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND 
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL 
 * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF 
 * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR 
 * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
 * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
 * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
 * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES. 
 * 
 * You acknowledge that this software is not designed or intended for 
 * use in the design, construction, operation or maintenance of any 
 * nuclear facility.
 */
package com.itextpdf.text.pdf;
import java.io.IOException;
import java.io.OutputStream;
import com.itextpdf.text.error_messages.MessageLocalization;

import com.itextpdf.text.ExceptionConverter;
/**
 * A class for performing LZW decoding.
 *
 *
 */
public class LZWDecoder {
    
    byte stringTable[][];
    byte data[] = null;
    OutputStream uncompData;
    int tableIndex, bitsToGet = 9;
    int bytePointer, bitPointer;
    int nextData = 0;
    int nextBits = 0;
    
    int andTable[] = {
        511,
        1023,
        2047,
        4095
    };
    
    public LZWDecoder() {
    }
    
    /**
     * Method to decode LZW compressed data.
     *
     * @param data            The compressed data.
     * @param uncompData      Array to return the uncompressed data in.
     */
    public void decode(byte data[], OutputStream uncompData) {
        
        if(data[0] == (byte)0x00 && data[1] == (byte)0x01) {
            throw new RuntimeException(MessageLocalization.getComposedMessage("lzw.flavour.not.supported"));
        }
        
        initializeStringTable();
        
        this.data = data;
        this.uncompData = uncompData;
        
        // Initialize pointers
        bytePointer = 0;
        bitPointer = 0;
        
        nextData = 0;
        nextBits = 0;
        
        int code, oldCode = 0;
        byte string[];
        
        while ((code = getNextCode()) != 257) {
            
            if (code == 256) {
                
                initializeStringTable();
                code = getNextCode();
                
                if (code == 257) {
                    break;
                }
                
                writeString(stringTable[code]);
                oldCode = code;
                
            } else {
                
                if (code < tableIndex) {
                    
                    string = stringTable[code];
                    
                    writeString(string);
                    addStringToTable(stringTable[oldCode], string[0]);
                    oldCode = code;
                    
                } else {
                    
                    string = stringTable[oldCode];
                    string = composeString(string, string[0]);
                    writeString(string);
                    addStringToTable(string);
                    oldCode = code;
                }
            }
        }
    }
    
    
    /**
     * Initialize the string table.
     */
    public void initializeStringTable() {
        
        stringTable = new byte[8192][];
        
        for (int i=0; i<256; i++) {
            stringTable[i] = new byte[1];
            stringTable[i][0] = (byte)i;
        }
        
        tableIndex = 258;
        bitsToGet = 9;
    }
    
    /**
     * Write out the string just uncompressed.
     */
    public void writeString(byte string[]) {
        try {
            uncompData.write(string);
        }
        catch (IOException e) {
            throw new ExceptionConverter(e);
        }
    }
    
    /**
     * Add a new string to the string table.
     */
    public void addStringToTable(byte oldString[], byte newString) {
        int length = oldString.length;
        byte string[] = new byte[length + 1];
        System.arraycopy(oldString, 0, string, 0, length);
        string[length] = newString;
        
        // Add this new String to the table
        stringTable[tableIndex++] = string;
        
        if (tableIndex == 511) {
            bitsToGet = 10;
        } else if (tableIndex == 1023) {
            bitsToGet = 11;
        } else if (tableIndex == 2047) {
            bitsToGet = 12;
        }
    }
    
    /**
     * Add a new string to the string table.
     */
    public void addStringToTable(byte string[]) {
        
        // Add this new String to the table
        stringTable[tableIndex++] = string;
        
        if (tableIndex == 511) {
            bitsToGet = 10;
        } else if (tableIndex == 1023) {
            bitsToGet = 11;
        } else if (tableIndex == 2047) {
            bitsToGet = 12;
        }
    }
    
    /**
     * Append <code>newString</code> to the end of <code>oldString</code>.
     */
    public byte[] composeString(byte oldString[], byte newString) {
        int length = oldString.length;
        byte string[] = new byte[length + 1];
        System.arraycopy(oldString, 0, string, 0, length);
        string[length] = newString;
        
        return string;
    }
    
    // Returns the next 9, 10, 11 or 12 bits
    public int getNextCode() {
        // Attempt to get the next code. The exception is caught to make
        // this robust to cases wherein the EndOfInformation code has been
        // omitted from a strip. Examples of such cases have been observed
        // in practice.
        try {
            nextData = (nextData << 8) | (data[bytePointer++] & 0xff);
            nextBits += 8;
            
            if (nextBits < bitsToGet) {
                nextData = (nextData << 8) | (data[bytePointer++] & 0xff);
                nextBits += 8;
            }
            
            int code =
            (nextData >> (nextBits - bitsToGet)) & andTable[bitsToGet-9];
            nextBits -= bitsToGet;
            
            return code;
        } catch(ArrayIndexOutOfBoundsException e) {
            // Strip not terminated as expected: return EndOfInformation code.
            return 257;
        }
    }
}

com/itextpdf/text/pdf/LZWDecoder.java

 

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⇐ iText layout.jar Source Code

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⇑⇑ iText for PDF Generation

2021-07-03, 47636👍, 0💬