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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
*
* ---------------
* HexTextUtils.java
* ---------------
*/
package org.jpedal.parser.text;
import org.jpedal.fonts.PdfFont;
import org.jpedal.fonts.StandardFonts;
import org.jpedal.fonts.glyph.T1GlyphFactory;
import org.jpedal.parser.ParserOptions;
/**
*
* @author markee
*/
class HexTextUtils {
static int getHexValue(final byte[] stream, int i, final GlyphData glyphData, final PdfFont currentFontData, final ParserOptions parserOptions ) {
//'<'=60
int chars=0,nextInt, start=i;
int charSize=glyphData.getCharSize();
//get number of chars
for (int i2 = 1; i2 < charSize; i2++) {
nextInt = stream[start + i2];
if(nextInt==62){ //allow for less than 4 chars at end of stream (ie 6c>)
i2=4;
charSize=2;
glyphData.setCharSize(2);
}else if(nextInt==10 || nextInt==13){ //avoid any returns
start++;
i2--;
}else{
chars++;
}
}
i=getValue(chars, stream, i,glyphData)-1;
return setValue(glyphData, glyphData.getPossibleValue(), i, currentFontData, parserOptions);
}
static int getHexCIDValue(final byte[] stream, final int i, final GlyphData glyphData, final PdfFont currentFontData, final ParserOptions parserOptions ) {
//'<'=60
final int oneByteEndPtr;
int twoByteEndPtr=0;
//single value
oneByteEndPtr=getValue(1, stream, i,glyphData);
int val=glyphData.getPossibleValue();
//System.out.println("getHexCIDValue val="+val);
setValue(glyphData, val, i, currentFontData, parserOptions);
// int firstVal=val;
//lazy init if needed
if(StandardFonts.CMAP==null){
StandardFonts.readCMAP();
}
// String firstValue = StandardFonts.CMAP[val];
/*
* 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
final boolean hasCharString=glyphData.getRawInt()>0 && currentFontData.CMapName!=null && currentFontData.getFontType()==StandardFonts.CIDTYPE0 && currentFontData.getGlyphData().getCharStrings().containsKey(String.valueOf(glyphData.getRawInt()));
final boolean debug=false;
boolean isMultiByte=false;
//ignore these cases
if(currentFontData.CMapName!=null && currentFontData.getUnicodeMapping(glyphData.getRawInt())!=null || stream[i]=='>'){
if(debug) {
System.out.println("ignore currentFontData.CMapName=" + currentFontData + ' ' +currentFontData.CMapName + " stream[i+2]=" + (char)stream[i]+ ' ' + (char)stream[i+1]+ ' ' + (char)stream[i+2]);
}
}else if(!hasCharString){//not sure if really needed
twoByteEndPtr=getValue(3, stream, i,glyphData);
final char combinedVal=(char)glyphData.getPossibleValue();
final int isDouble=currentFontData.isDoubleBytes(val, combinedVal & 255,false);
//if the combined value has a glyph, assume a 4 byte CID value
if(isDouble==1 || currentFontData.glyphs.getEmbeddedGlyph( new T1GlyphFactory(false),null , null, combinedVal, "", -1, null)!=null){
isMultiByte=true;
val=combinedVal;
if(debug) {
System.out.println("use 2 values=" + Integer.toHexString(combinedVal));
}
}
}
if(isMultiByte){
return setValue(glyphData, val, twoByteEndPtr-1, currentFontData, parserOptions);
}else{
return oneByteEndPtr-1;
}
}
private static int setValue(final GlyphData glyphData, final int val, final int i, final PdfFont currentFontData, final ParserOptions parserOptions) {
//System.out.println("setValue="+val+" "+i+" "+charSize);
glyphData.setRawInt(val);
//i = i + charSize-1; //move offset
glyphData.setRawChar((char) val);
glyphData.setDisplayValue(currentFontData.getGlyphValue(val));
if(currentFontData.isCIDFont() && currentFontData.getCMAP()!=null && currentFontData.getUnicodeMapping(val)==null){
glyphData.setRawChar(glyphData.getDisplayValue().charAt(0));
glyphData.setRawInt(glyphData.getRawChar());
}
if(parserOptions.isTextExtracted()) {
glyphData.setUnicodeValue(currentFontData.getUnicodeValue(glyphData.getDisplayValue(), glyphData.getRawInt()));
}
return i;
}
private static int getValue(final int chars, final byte[] stream, int i, final GlyphData glyphData) {
int topHex,val = 0, charsToFind = chars;
while (charsToFind > -1) {
topHex = stream[i];
//convert to number
if (topHex >= 'A' && topHex <= 'F') {
topHex -= 55;
} else if (topHex >= 'a' && topHex <= 'f') {
topHex -= 87;
} else if (topHex >= '0' && topHex <= '9') {
topHex -= 48;
} else { //ignore 'bum' values
topHex = -1;
}
if (topHex > -1) {
val += (topHex << TD.multiply16[charsToFind]);
charsToFind--;
}
i++;
}
glyphData.setPossibleValue(val);
return i;
}
}