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An Open Source JavaFX PDF Viewer
/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/support/
*
* (C) Copyright 1997-2017 IDRsolutions and Contributors.
*
* This file is part of JPedal/JPDF2HTML5
*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ---------------
* PageLabels.java
* ---------------
*/
package org.jpedal.io;
import java.util.HashMap;
import org.jpedal.objects.raw.PageLabelObject;
import org.jpedal.objects.raw.PdfArrayIterator;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.PdfObject;
/**
* convert names to refs
*/
public class PageLabels extends HashMap{
private final PdfFileReader objectReader;
private final int pageCount;
private static final String symbolLowerCase[]={"m","cm", "d", "cd", "c", "xc", "l", "xl", "x", "ix", "v", "iv", "i"};
private static final String symbolUpperCase[]={"M","CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
private static final String lettersLowerCase[]={"a","b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m","n",
"o", "p", "q", "r", "s", "t", "u", "v", "x", "w", "y", "z"};
private static final String lettersUpperCase[]={"A","B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M","N",
"O", "P", "Q", "R", "S", "T", "U", "V", "X", "W", "Y", "Z"};
private static final int[] power={1000,900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
PageLabels(final PdfFileReader objectReader, final int pageCount) {
this.objectReader=objectReader;
this.pageCount=pageCount;
}
void readLabels(final PdfObject pageObj) {
final PdfArrayIterator numList =pageObj.getMixedArray(PdfDictionary.Nums);
if(numList!=null && objectReader!=null && numList.hasMoreTokens()){
int endPage,numbType,St,pageNum;
String convertedPage,pageLabel;
PageLabelObject labelObj;
boolean isFirstToken = true;
//read first page values
int startPage=numList.getNextValueAsInteger(true)+1;
while (numList.hasMoreTokens()) {
//read LabelObject
labelObj = getObject(numList.getNextValueAsByte(true));
numbType = labelObj.getNameAsConstant(PdfDictionary.S);
pageLabel = labelObj.getTextStreamValue(PdfDictionary.P);
St = labelObj.getInt(PdfDictionary.St);
if (St > 0) {
pageNum = St;
} else {
pageNum = 1;
}
// Do not store PageLabels if the only token is /S /D (default behavior). E.g. sample_pdfs_html/12jul/1997.pdf
// Do store in any other case (even if P matches page number). E.g. sample_pdfs_html/12jul/1130MA0711w.pdf
// This is the same behavior as Adobe Reader.
if (isFirstToken && numbType == PdfDictionary.D &&
pageLabel == null && St <= 0 && !numList.hasMoreTokens()) {
break;
}
isFirstToken = false;
if (numList.hasMoreTokens()) {
endPage = numList.getNextValueAsInteger(true) + 1;
} else {
endPage = pageCount + 1;
}
//now decode type of naming and fill range
for (int page = startPage; page < endPage; page++) {
if (pageLabel != null) {
convertedPage = pageLabel + getNumberValue(numbType, pageNum);
} else {
convertedPage = getNumberValue(numbType, pageNum);
}
this.put(page, convertedPage);
pageNum++;
}
startPage = endPage;
}
}
}
private PageLabelObject getObject(final byte[] data) {
final PageLabelObject labelObj = new PageLabelObject(new String(data));
if(data[0]=='<') {
labelObj.setStatus(PdfObject.UNDECODED_DIRECT);
} else {
labelObj.setStatus(PdfObject.UNDECODED_REF);
}
labelObj.setUnresolvedData(data,PdfDictionary.PageLabels);
final ObjectDecoder objectDecoder=new ObjectDecoder(this.objectReader);
objectDecoder.checkResolved(labelObj);
return labelObj;
}
private static String getNumberValue(final int numbType, final int page) {
final String convertedPage;
switch(numbType){
case PdfDictionary.a:
convertedPage=convertLetterToNumber(page, lettersLowerCase);
break;
case PdfDictionary.A:
convertedPage=convertLetterToNumber(page, lettersUpperCase);
break;
case PdfDictionary.D:
convertedPage=String.valueOf(page);
break;
case PdfDictionary.R:
convertedPage=convertToRoman(page,symbolUpperCase);
break;
case PdfDictionary.r:
convertedPage=convertToRoman(page,symbolLowerCase);
break;
default:
convertedPage="";
}
return convertedPage;
}
private static String convertToRoman(int arabicNumber, final String[] symbols){
final StringBuilder romanNumeral=new StringBuilder();
int repeat;
for(int x=0; arabicNumber>0; x++){
repeat=arabicNumber/power[x];
for(int chars=1; chars<=repeat; chars++){
romanNumeral.append(symbols[x]);
}
arabicNumber %= power[x];
}
return romanNumeral.toString();
}
private static String convertLetterToNumber(final int page, final String[] letters) {
final StringBuilder finalLetters=new StringBuilder();
final int repeat = page/26;
final int remainder = page%26;
if (repeat>0) {
for (int x=0; x