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:

⏎ com/itextpdf/text/io/RandomAccessSourceFactory.java

/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2020 iText Group NV
 * Authors: Kevin Day, Bruno Lowagie, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS.
 *
 * This program 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 Affero General License for more
 * details. You should have received a copy of the GNU Affero General License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General License.
 *
 * In accordance with Section 7(b) of the GNU Affero General License, a covered
 * work must retain the producer line in every PDF that is created or
 * manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing a
 * commercial license. Buying such a license is mandatory as soon as you develop
 * commercial activities involving the iText software without disclosing the
 * source code of your own applications. These activities include: offering paid
 * services to customers as an ASP, serving PDFs on the fly in a web
 * application, shipping iText with a closed source product.
 *
 * For more information, please contact iText Software Corp. at this address:
 * sales@itextpdf.com
 */
package com.itextpdf.text.io;

import com.itextpdf.text.error_messages.MessageLocalization;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.net.URL;
import java.nio.channels.FileChannel;

/**
 * Factory to create {@link RandomAccessSource} objects based on various types of sources
 * @since 5.3.5
 *
 */

public final class RandomAccessSourceFactory {

	/**
	 * whether the full content of the source should be read into memory at construction
	 */
	private boolean forceRead = false;
	
	/**
	 * Whether {@link RandomAccessFile} should be used instead of a {@link FileChannel}, where applicable
	 */
	private boolean usePlainRandomAccess = false;
	
	/**
	 * Whether the underlying file should have a RW lock on it or just an R lock
	 */
	private boolean exclusivelyLockFile = false;
	
	/**
	 * Creates a factory that will give preference to accessing the underling data source using memory mapped files
	 */
	public RandomAccessSourceFactory() {
	}
	
	/**
	 * Determines whether the full content of the source will be read into memory
	 * @param forceRead true if the full content will be read, false otherwise
	 * @return this object (this allows chaining of method calls)
	 */
	public RandomAccessSourceFactory setForceRead(boolean forceRead){
		this.forceRead = forceRead;
		return this;
	}
	
	/**
	 * Determines whether {@link RandomAccessFile} should be used as the primary data access mechanism
	 * @param usePlainRandomAccess whether {@link RandomAccessFile} should be used as the primary data access mechanism
	 * @return this object (this allows chaining of method calls)
	 */
	public RandomAccessSourceFactory setUsePlainRandomAccess(boolean usePlainRandomAccess){
		this.usePlainRandomAccess = usePlainRandomAccess;
		return this;
	}
	
	public RandomAccessSourceFactory setExclusivelyLockFile(boolean exclusivelyLockFile){
		this.exclusivelyLockFile = exclusivelyLockFile;
		return this;
	}
	
	/**
	 * Creates a {@link RandomAccessSource} based on a byte array
	 * @param data the byte array
	 * @return the newly created {@link RandomAccessSource}
	 */
	public RandomAccessSource createSource(byte[] data){
		return new ArrayRandomAccessSource(data); 
	}
	
	public RandomAccessSource createSource(RandomAccessFile raf) throws IOException {
		return new RAFRandomAccessSource(raf); 
	}
	
	/**
	 * Creates a {@link RandomAccessSource} based on a URL.  The data available at the URL is read into memory and used
	 * as the source for the {@link RandomAccessSource}
	 * @param url the url to read from
	 * @return the newly created {@link RandomAccessSource}
	 */
	public RandomAccessSource createSource(URL url) throws IOException{
        InputStream is = url.openStream();
        try {
        	return createSource(is);
        }
        finally {
            try {is.close();}catch(IOException ioe){}
        }
	}
	
	/**
	 * Creates a {@link RandomAccessSource} based on an {@link InputStream}.  The full content of the InputStream is read into memory and used
	 * as the source for the {@link RandomAccessSource}
	 * @param is the stream to read from
	 * @return the newly created {@link RandomAccessSource}
	 */
	public RandomAccessSource createSource(InputStream is) throws IOException{
       try {
        	return createSource(StreamUtil.inputStreamToArray(is));
        }
        finally {
            try {is.close();}catch(IOException ioe){}
        }		
	}
	
	/**
	 * Creates a {@link RandomAccessSource} based on a filename string.
	 * If the filename describes a URL, a URL based source is created
	 * If the filename describes a file on disk, the contents may be read into memory (if forceRead is true), opened using memory mapped file channel (if usePlainRandomAccess is false), or opened using {@link RandomAccessFile} access (if usePlainRandomAccess is true)
	 * This call will automatically failover to using {@link RandomAccessFile} if the memory map operation fails
	 * @param filename the name of the file or resource to create the {@link RandomAccessSource} for
	 * @return the newly created {@link RandomAccessSource}
	 */
	public RandomAccessSource createBestSource(String filename) throws IOException{
		File file = new File(filename);
		if (!file.canRead()){
	        if (filename.startsWith("file:/")
	        		|| filename.startsWith("http://") 
	                || filename.startsWith("https://")
	                || filename.startsWith("jar:")
	                || filename.startsWith("wsjar:")
	                || filename.startsWith("wsjar:")
	                || filename.startsWith("vfszip:")) {
	        	return createSource(new URL(filename));
	        } else {
	        	return createByReadingToMemory(filename);
	        }
		}
	        
        if (forceRead){
        	return createByReadingToMemory(new FileInputStream(filename));
        }
		
        String openMode = exclusivelyLockFile ? "rw" : "r";
        
		RandomAccessFile raf = new RandomAccessFile(file, openMode);
		
    	if (exclusivelyLockFile){
    		raf.getChannel().lock();
    	}
    	
        try{
        	// ownership of the RAF passes to whatever source is created by createBestSource.
        	return createBestSource(raf);
        } catch (IOException e){ // If creation of the source throws, we must close the RAF we created.
        	try{
        		raf.close();
        	} catch (IOException ignore){}
        	throw e;
        } catch (RuntimeException e){ // if we get a runtime exception during opening, we must close the RAF we created
        	try{
        		raf.close();
        	} catch (IOException ignore){}
        	throw e;
        }
	}
	
	/**
	 * Creates a {@link RandomAccessSource} based on a RandomAccessFile.
	 * The source will be opened using memory mapped file channel (if usePlainRandomAccess is false), or opened using {@link RandomAccessFile} access (if usePlainRandomAccess is true)
	 * This call will automatically failover to using {@link RandomAccessFile} if the memory map operation fails
	 * If the source couldn't be opened, the RandomAccessFile will be closed
	 * @param raf the RandomAccessFile to create a {@link RandomAccessSource} for
	 * @return the newly created {@link RandomAccessSource}
	 */
	public RandomAccessSource createBestSource(RandomAccessFile raf) throws IOException{
    	
        if (usePlainRandomAccess){
        	return new RAFRandomAccessSource(raf);
        }
        
    	if (raf.length() <= 0) // files with zero length can't be mapped and will throw an IllegalArgumentException.  Just open using a simple RAF source.
    		return new RAFRandomAccessSource(raf); 
    	
		try{
			// ownership of the RAF passes to whatever source is created by createBestSource. 
			return createBestSource(raf.getChannel());
		} catch (MapFailedException e){
			return new RAFRandomAccessSource(raf);
		}
	}
	
	/**
	 * Creates a {@link RandomAccessSource} based on memory mapping a file channel.
	 * Unless you are explicitly working with a FileChannel already, it is better to use
	 * {@link RandomAccessSourceFactory#createBestSource(String)}.
	 * If the file is large, it will be opened using a paging strategy.
	 * @param filename the name of the file or resource to create the {@link RandomAccessSource} for
	 * @return the newly created {@link RandomAccessSource}
	 */
	public RandomAccessSource createBestSource(FileChannel channel) throws IOException{
		if (channel.size() <= PagedChannelRandomAccessSource.DEFAULT_TOTAL_BUFSIZE){ // if less than the fully mapped usage of PagedFileChannelRandomAccessSource, just map the whole thing and be done with it
			return new GetBufferedRandomAccessSource(new FileChannelRandomAccessSource(channel));
		} else {
			return new GetBufferedRandomAccessSource(new PagedChannelRandomAccessSource(channel));
		}
	}
	
	public RandomAccessSource createRanged(RandomAccessSource source, long[] ranges) throws IOException{
		RandomAccessSource[] sources = new RandomAccessSource[ranges.length/2];
		for(int i = 0; i < ranges.length; i+=2){
			sources[i/2] = new WindowRandomAccessSource(source, ranges[i], ranges[i+1]);
		}
		return new GroupedRandomAccessSource(sources);
	}
	
	/**
	 * Creates a new {@link RandomAccessSource} by reading the specified file/resource into memory
	 * @param filename the name of the resource to read
	 * @return the newly created {@link RandomAccessSource}
	 * @throws IOException if reading the underling file or stream fails
	 */
	private RandomAccessSource createByReadingToMemory(String filename) throws IOException {
        InputStream is = StreamUtil.getResourceStream(filename);
        if (is == null)
            throw new IOException(MessageLocalization.getComposedMessage("1.not.found.as.file.or.resource", filename));
        return createByReadingToMemory(is);
	}
	
	/**
	 * Creates a new {@link RandomAccessSource} by reading the specified file/resource into memory
	 * @param is the name of the resource to read
	 * @return the newly created {@link RandomAccessSource}
	 * @throws IOException if reading the underling file or stream fails
	 */
	private RandomAccessSource createByReadingToMemory(InputStream is) throws IOException {
        try {
        	return new ArrayRandomAccessSource(StreamUtil.inputStreamToArray(is));
        }
        finally {
            try {is.close();}catch(IOException ioe){}
        }
	}
	

}

⏎ com/itextpdf/text/io/RandomAccessSourceFactory.java

Or download all of them as a single archive file:

File name: itextpdf-5.5.14-fyi.zip
File size: 2163839 bytes
Release date: 2009-10-09
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