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/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/support/
*
* (C) Copyright 1997-2016 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
*
* ---------------
* TextStream.java
* ---------------
*/
package org.jpedal.io.types;
import org.jpedal.exception.PdfSecurityException;
import static org.jpedal.io.ObjectDecoder.debugFastCode;
import static org.jpedal.io.ObjectDecoder.padding;
import org.jpedal.io.ObjectUtils;
import org.jpedal.io.PdfFileReader;
import org.jpedal.io.security.DecryptionFactory;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.PdfObject;
import org.jpedal.utils.LogWriter;
/**
*
*/
public class TextStream {
public static int readTextStream(final PdfObject pdfObject, int i, final byte[] raw, final int PDFkeyInt, final boolean ignoreRecursion,
final PdfFileReader objectReader) {
byte[] data;
try{
if(raw[i]!='<' && raw[i]!='(') {
i++;
}
i=StreamReaderUtils.skipSpaces(raw,i);
//get next key to see if indirect
final boolean isRef=raw[i]!='<' && raw[i]!='(';
int j=i;
data=raw;
if(isRef){
final int[] values = StreamReaderUtils.readRefFromStream(raw, i);
final int number = values[0];
final int generation = values[1];
i = values[2];
//move cursor to start of R
while(raw[i]==10 || raw[i]==13 || raw[i]==32 || raw[i]==47 || raw[i]==60) {
i++;
}
if(raw[i]!=82) //we are expecting R to end ref
{
return raw.length;
}
//throw new RuntimeException(i+" 3. Unexpected value in file " + (char) raw[i - 2]+ (char) raw[i-1] + (char) raw[i] + (char) raw[i+1] + (char) raw[i+2]+(char)raw[i]+" - please send to IDRsolutions for analysis "+pdfObject.getObjectRefAsString()+" "+pdfObject);
if(!ignoreRecursion){
//read the Dictionary data
data=objectReader.readObjectAsByteArray(pdfObject, objectReader.isCompressed(number, generation), number, generation);
// System.out.println("data read is>>>>>>>>>>>>>>>>>>>\n");
// for(int ab=0;ab' || data[j]==0)) {
break;
}
}
}
if(!ignoreRecursion){
byte[] newString;
if(data[start]=='<'){
start++;
final int byteCount=(j-start)>>1;
newString=new byte[byteCount];
int byteReached=0,topHex,bottomHex;
while(true){
if(start==j) {
break;
}
start=StreamReaderUtils.skipSpaces(data,start);
topHex=data[start];
//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;
}
start++;
start=StreamReaderUtils.skipSpaces(data,start);
bottomHex=data[start];
if(bottomHex>='A' && bottomHex<='F'){
bottomHex -= 55;
}else if(bottomHex>='a' && bottomHex<='f'){
bottomHex -= 87;
}else if(bottomHex>='0' && bottomHex<='9'){
bottomHex -= 48;
}else{
LogWriter.writeLog("Unexpected number " + (char) data[start]);
return i;
}
start++;
//calc total
final int finalValue=bottomHex+(topHex<<4);
newString[byteReached] = (byte)finalValue;
byteReached++;
}
}else{
//roll past (
if(data[start]=='(') {
start++;
}
boolean lbKeepReturns = false;
switch ( PDFkeyInt ) {
case PdfDictionary.ID:
lbKeepReturns = true;
break;
case PdfDictionary.O:
case PdfDictionary.U:
// O and U in Encrypt may contain line breaks as valid password chars ...
lbKeepReturns = pdfObject.getObjectType() == PdfDictionary.Encrypt;
break;
}
newString = ObjectUtils.readEscapedValue(j,data, start,lbKeepReturns);
}
if(pdfObject.getObjectType()!= PdfDictionary.Encrypt){// && pdfObject.getObjectType()!=PdfDictionary.Outlines){
try {
if(!pdfObject.isInCompressedStream() || PDFkeyInt==PdfDictionary.Name || PDFkeyInt==PdfDictionary.Reason || PDFkeyInt==PdfDictionary.Location || PDFkeyInt==PdfDictionary.M){
final DecryptionFactory decryption=objectReader.getDecryptionObject();
if(decryption!=null) {
newString = decryption.decryptString(newString, pdfObject.getObjectRefAsString());
}
}
} catch (final PdfSecurityException e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
}
pdfObject.setTextStreamValue(PDFkeyInt, newString);
if(debugFastCode) {
System.out.println(padding + "TextStream=" + new String(newString) + " in pdfObject=" + pdfObject);
}
}
if(!isRef) {
i = j;
}
}catch(final Exception e){
LogWriter.writeLog("Exception: " + e.getMessage());
}
return i;
}
public static int setTextStreamValue(final PdfObject pdfObject, int i, final byte[] raw, final boolean ignoreRecursion, final int PDFkeyInt, final PdfFileReader objectReader) {
if(raw[i+1]==40 && raw[i+2]==41){ //allow for empty stream
i += 3;
pdfObject.setTextStreamValue(PDFkeyInt, new byte[1]);
if(raw[i]=='/') {
i--;
}
}else {
i = TextStream.readTextStream(pdfObject, i, raw, PDFkeyInt, ignoreRecursion, objectReader);
}
return i;
}
}
