/*
* Copyright 2008 by Kevin Day.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (the "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999-2008 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000-2008 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library 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 Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.lowagie.text.pdf.parser;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import com.lowagie.text.pdf.PdfDictionary;
import com.lowagie.text.pdf.PdfName;
import com.lowagie.text.pdf.PdfObject;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.RandomAccessFileOrArray;
/**
* Tool that parses the content of a PDF document.
* @since 2.1.4
*/
public class PdfContentReaderTool {
/**
* Shows the detail of a dictionary.
* This is similar to the PdfLister functionality.
* @param dic the dictionary of which you want the detail
* @return a String representation of the dictionary
*/
static public String getDictionaryDetail(PdfDictionary dic){
return getDictionaryDetail(dic, 0);
}
/**
* Shows the detail of a dictionary.
* @param dic the dictionary of which you want the detail
* @param depth the depth of the current dictionary (for nested dictionaries)
* @return a String representation of the dictionary
*/
static public String getDictionaryDetail(PdfDictionary dic, int depth){
StringBuffer builder = new StringBuffer();
builder.append('(');
List subDictionaries = new ArrayList();
for (Iterator i = dic.getKeys().iterator(); i.hasNext(); ) {
PdfName key = (PdfName)i.next();
PdfObject val = dic.getDirectObject(key);
if (val.isDictionary())
subDictionaries.add(key);
builder.append(key);
builder.append('=');
builder.append(val);
builder.append(", ");
}
builder.setLength(builder.length()-2);
builder.append(')');
PdfName pdfSubDictionaryName;
for (Iterator it = subDictionaries.iterator(); it.hasNext(); ) {
pdfSubDictionaryName = (PdfName)it.next();
builder.append('\n');
for(int i = 0; i < depth+1; i++){
builder.append('\t');
}
builder.append("Subdictionary ");
builder.append(pdfSubDictionaryName);
builder.append(" = ");
builder.append(getDictionaryDetail(dic.getAsDict(pdfSubDictionaryName), depth+1));
}
return builder.toString();
}
/**
* Writes information about a specific page from PdfReader to the specified output stream.
* @since 2.1.5
* @param reader the PdfReader to read the page content from
* @param pageNum the page number to read
* @param out the output stream to send the content to
* @throws IOException
*/
static public void listContentStreamForPage(PdfReader reader, int pageNum, PrintWriter out) throws IOException {
out.println("==============Page " + pageNum + "====================");
out.println("- - - - - Dictionary - - - - - -");
PdfDictionary pageDictionary = reader.getPageN(pageNum);
out.println(getDictionaryDetail(pageDictionary));
out.println("- - - - - Content Stream - - - - - -");
RandomAccessFileOrArray f = reader.getSafeFile();
byte[] contentBytes = reader.getPageContent(pageNum, f);
f.close();
InputStream is = new ByteArrayInputStream(contentBytes);
int ch;
while ((ch = is.read()) != -1){
out.print((char)ch);
}
out.println("- - - - - Text Extraction - - - - - -");
PdfTextExtractor extractor = new PdfTextExtractor(reader, new SimpleTextExtractingPdfContentRenderListener());
String extractedText = extractor.getTextFromPage(pageNum);
if (extractedText.length() != 0)
out.println(extractedText);
else
out.println("No text found on page " + pageNum);
out.println();
}
/**
* Writes information about each page in a PDF file to the specified output stream.
* @since 2.1.5
* @param pdfFile a File instance referring to a PDF file
* @param out the output stream to send the content to
* @throws IOException
*/
static public void listContentStream(File pdfFile, PrintWriter out) throws IOException {
PdfReader reader = new PdfReader(pdfFile.getCanonicalPath());
int maxPageNum = reader.getNumberOfPages();
for (int pageNum = 1; pageNum <= maxPageNum; pageNum++){
listContentStreamForPage(reader, pageNum, out);
}
}
/**
* Writes information about the specified page in a PDF file to the specified output stream.
* @since 2.1.5
* @param pdfFile a File instance referring to a PDF file
* @param pageNum the page number to read
* @param out the output stream to send the content to
* @throws IOException
*/
static public void listContentStream(File pdfFile, int pageNum, PrintWriter out) throws IOException {
PdfReader reader = new PdfReader(pdfFile.getCanonicalPath());
listContentStreamForPage(reader, pageNum, out);
}
/**
* Writes information about each page in a PDF file to the specified file, or System.out.
* @param args
*/
public static void main(String[] args) {
try{
if (args.length < 1 || args.length > 3){
System.out.println("Usage: PdfContentReaderTool <pdf file> [<output file>|stdout] [<page num>]");
return;
}
PrintWriter writer = new PrintWriter(System.out);
if (args.length >= 2){
if (args[1].compareToIgnoreCase("stdout") != 0){
System.out.println("Writing PDF content to " + args[1]);
writer = new PrintWriter(new FileOutputStream(new File(args[1])));
}
}
int pageNum = -1;
if (args.length >= 3){
pageNum = Integer.parseInt(args[2]);
}
if (pageNum == -1){
listContentStream(new File(args[0]), writer);
} else {
listContentStream(new File(args[0]), pageNum, writer);
}
writer.flush();
if (args.length >= 2){
writer.close();
System.out.println("Finished writing content to " + args[1]);
}
} catch (Exception e){
e.printStackTrace(System.err);
}
}
}