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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
*
* ---------------
* CIDTextUtils.java
* ---------------
*/
package org.jpedal.parser.text;
import org.jpedal.fonts.PdfFont;
import org.jpedal.fonts.StandardFonts;
import org.jpedal.fonts.tt.FontFile2;
import org.jpedal.parser.ParserOptions;
/**
*
* @author markee
*/
public class CIDTextUtils {
static int getCIDCharValues(int i, final byte[] stream, final int streamLength, final GlyphData glyphData, final PdfFont currentFontData, final ParserOptions parserOptions) {
/*
* first time we read the first 2 values and then decide if we are in single or
* double byte mode
* (ie is there a 0 x 0y pattern)
* (or do the 2 values on their own form valid settings)
*/
final boolean debug=false;
float actualWidth=0;
//lazy init if needed
if(StandardFonts.CMAP==null){
StandardFonts.readCMAP();
}
int firstVal=glyphData.getRawInt();
final String firstValue;
String newValue=null;
//System.out.println(">>"+Integer.toHexString(firstVal));
//if escaped roll on
if(firstVal==92){
i++;
firstVal= stream[i] & 255;
if ((streamLength > (i + 2)) && (Character.isDigit((char) stream[i]))) {
//see how long number is
int numberCount = 1;
if (Character.isDigit((char) stream[i+1])) {
numberCount++;
if (Character.isDigit((char) stream[i+2])) {
numberCount++;
}
}
// convert octal escapes
firstVal = TD.readEscapeValue(i, numberCount, 8, stream);
i = i + numberCount - 1;
if (firstVal > 255) {
firstVal -= 256;
}
}else if (firstVal == 'u') { //convert unicode of format uxxxx to char value
firstVal = TD.readEscapeValue(i + 1, 4, 16, stream);
i += 4;
} else {
firstVal = convertEscapeChar(firstVal);
}
glyphData.setRaw(firstVal);
}else{
firstVal=glyphData.getRawChar();
}
//get as 1 byte value
firstValue = StandardFonts.CMAP[glyphData.getRawChar()];
if(debug) {
System.out.println("1 byte values=" + (int) glyphData.getRawChar() + " val=" + firstValue + " isDouble=" + currentFontData.isCIDFont() + " currentFontData.hasDoubleBytes=" + currentFontData.hasDoubleBytes+ ' ' +currentFontData.isDoubleBytes());//+" "+(char)stream[i-2]+" "+(char)stream[i-1]+" "+(char)stream[i]+" "+(char)stream[i+1]+" "+(char)stream[i+2]+" "+(char)stream[i+3]);
}
/*
* read second byte if needed (we always read first time to see if double byte or single)
*/
final boolean isEmbedded =currentFontData.isFontEmbedded;
//also check if mapped in Charstring
//separates out
// PDFdata/baseline_screens/customersDec2012/5771020130000784D.pdf and
//PDFdata/sample_pdfs_html/general/JavaMagazine glassfish article.pdf
final boolean hasCharString=glyphData.getRawInt()>0 && currentFontData.CMapName!=null && currentFontData.getFontType()==StandardFonts.CIDTYPE0 && currentFontData.getGlyphData().getCharStrings().containsKey(String.valueOf(glyphData.getRawInt()));
//ignore this case
if(currentFontData.CMapName!=null && currentFontData.CMapName.equals("OneByteIdentityH")){
//System.out.println(currentFontData.CMapName);
}else if(!hasCharString && (currentFontData.hasDoubleBytes || firstValue==null || currentFontData.isDoubleBytes()!=0 || (glyphData.getRawInt()>128 && glyphData.getRawInt()!=233))){
//flag incase we are wrong and need to switch back
final int iBefore=i;
i++;
int secondVal= stream[i] & 255;
boolean secondByteIsEscaped=false;
//if escaped roll on as workaround hack
if(stream[i]==92){
i++;
secondByteIsEscaped=true;
if(glyphData.getRawInt()==0){
while(stream[i]==13 || (stream[i]==92 && stream[i-1]==13)){ //allow for garbage in stream
i++;
}
}
secondVal=stream[i] & 255;
if ((streamLength > (i + 2)) && (Character.isDigit((char) stream[i]))) {
//see how long number is
int numberCount = 1;
if (Character.isDigit((char) stream[i + 1])) {
numberCount++;
if (Character.isDigit((char) stream[i + 2])) {
numberCount++;
}
}
// convert octal escapes
secondVal = TD.readEscapeValue(i, numberCount, 8, stream);
i = i + numberCount - 1;
if (secondVal > 255) {
secondVal -= 256;
}
}else if (secondVal == 'u') { //convert unicode of format uxxxx to char value
secondVal = TD.readEscapeValue(i + 1, 4, 16, stream);
i += 4;
} else {
secondVal = convertEscapeChar(secondVal);
}
}
final int secondByte=secondVal;
final char combinedVal=(char)((glyphData.getRawChar()<<8)+secondVal);
//lookup in 2 byte version
newValue = StandardFonts.CMAP[combinedVal];
int isDouble=-1;
//if CIDtoGID use that first to see if double byte
if(currentFontData.isCIDFont() && currentFontData.getGlyphData().getTable(FontFile2.CMAP)==null){
final int first=currentFontData.getEncodedCMAPValue(firstVal);
final int second=currentFontData.getEncodedCMAPValue(secondVal);
final int combined=currentFontData.getEncodedCMAPValue(combinedVal);
if(combined<=0 && (first>0 || second>0)){
newValue=null;
isDouble=0;
}
}
if(isDouble==-1){
isDouble=currentFontData.isDoubleBytes(firstVal,secondByte, secondByteIsEscaped);
}
if(debug) {
System.out.println("2 byte values=" + newValue + ' ' + " isDouble=" + isDouble + ' ' + combinedVal + ' ' + firstValue);
}
//if no 2 byte value either default to 1 byte
if(isEmbedded && (isDouble==1 || combinedVal<256 || newValue!=null)){// || (!secondByteIsEscaped && secondByte!=')'))){
glyphData.setRawInt(combinedVal);
glyphData.setRawChar(combinedVal);
if(debug) {
System.out.println("use 2 values=" + Integer.toHexString(combinedVal) + " new value=" + newValue + " isEmbedded=" + isEmbedded + ' ' + (!secondByteIsEscaped && secondByte != ')'));
}
}else if(!isEmbedded && isDouble==1 &&(newValue!=null || combinedVal<256 || (!secondByteIsEscaped && secondByte!=')'))){
glyphData.setRawInt(combinedVal);
glyphData.setRawChar(combinedVal);
if(debug) {
System.out.println("use 2 values=" + combinedVal + ' ' + newValue);
}
}else if(isDouble==0 && !isEmbedded && firstVal>128 && newValue!=null && firstValue==null){
glyphData.setRawInt(combinedVal);
glyphData.setRawChar(combinedVal);
if(debug) {
System.out.println("TEST2 " + newValue + ' ' + StandardFonts.CMAP[secondByte]);
}
}else if(isDouble==0 && !isEmbedded && firstVal>128 && newValue==null && firstValue!=null){
i=iBefore;
//glyphData.rawInt=combinedVal;
//rawChar=(char)f;
// newValue = String.valueOf(rawChar);
newValue=firstValue;
if(debug) {
System.out.println("TEST2 " + newValue + ' ' + StandardFonts.CMAP[secondByte]);
}
}else{
i=iBefore;
if(debug) {
System.out.println("reset " + newValue + ' ' + StandardFonts.CMAP[secondByte]);
}
}
if(!isEmbedded){
actualWidth = currentFontData.getDefaultWidth(glyphData.getRawInt());
if(actualWidth==-1){
actualWidth = currentFontData.getDefaultWidth(-1);
}
}
}else{
actualWidth =-1;
if((!isEmbedded) &&
(currentFontData.getFontType()==StandardFonts.CIDTYPE0 || currentFontData.getFontType()==StandardFonts.CIDTYPE2)){
actualWidth = currentFontData.getDefaultWidth(glyphData.getRawInt());
if(actualWidth==-1){
actualWidth = currentFontData.getDefaultWidth(-1)/2;
}
}
}
glyphData.setActualWidth(actualWidth);
//if no value ignore for moment
if(newValue!=null){
glyphData.setDisplayValue(newValue);
}else{ //default if no value
glyphData.setDisplayValue(String.valueOf(glyphData.getRawChar()));
}
if(parserOptions.isTextExtracted()){ //(not sure if this is correct - may need more samples)
glyphData.setUnicodeValue(currentFontData.getUnicodeValue(glyphData.getDisplayValue(), glyphData.getRawChar()));
}
//fix for \\) at end of stream
if(glyphData.getRawChar()==92) {
glyphData.setValueForHTML(92);
glyphData.setRawChar((char)120);
}
if(debug) {
System.out.println("returns =" + glyphData.getDisplayValue() + ' ' + glyphData.getUnicodeValue() + " int=" + glyphData.getRawInt() + " actualWidth=" + actualWidth);
}
return i;
}
static int convertEscapeChar(final int secondVal) {
switch (secondVal) {
case 'n':
return '\n';
case 'b':
return '\b';
case 't':
return '\t';
case 'r':
return '\r';
case 'f':
return '\f';
default:
return secondVal;
}
}
}