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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
*
* ---------------
* LinearThread.java
* ---------------
*/
package org.jpedal.linear;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import org.jpedal.FileAccess;
import org.jpedal.io.LinearizedHintTable;
import org.jpedal.io.PdfObjectReader;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.PdfObject;
import org.jpedal.utils.LogWriter;
import org.jpedal.utils.NumberUtils;
/**
* handles download of rest of file in Linearized mode
*/
public class LinearThread extends Thread {
public int percentageDone;
final FileChannel fos;
final PdfObject linearObj;
final InputStream is;
final File tempURLFile;
final LinearizedHintTable linHintTable;
final byte[] startObj= {'o','b','j'},endObj= {'e','n','d','o','b','j'};
int startCharReached, endCharReached;
int startObjPtr,endObjPtr;
//use top line to slow down load speed
public static int bufSize=8192;
int ref;
final int firstObjLength;
final FileAccess fileAccess;
final byte[] linearBytes;
public LinearThread(final InputStream is, final FileChannel fos, final File tempURLFile, final PdfObject linearObj, final byte[] linearBytes, final LinearizedHintTable linHintTable, final FileAccess fileAccess) {
this.fos=fos;
this.linearObj=linearObj;
this.is=is;
this.tempURLFile=tempURLFile;
this.linHintTable=linHintTable;
this.linearBytes=linearBytes;
this.fileAccess=fileAccess;
//scan start of file for objects
firstObjLength=linearBytes.length;
scanStreamForObjects(0, null, linearBytes);
this.setDaemon(true);
}
public int getPercentageLoaded(){
return percentageDone;
}
@Override
public void run() {
final int linearfileLength=linearObj.getInt(PdfDictionary.L);
try{
int read,bytesRead=0;
//we cache last few bytes incase ref rolls across boundary
byte[] lastBuffer=linearBytes;//new byte[lastBytes];
byte[] buffer = new byte[bufSize];
byte[] b;
while ((read = is.read(buffer)) != -1 && !this.isInterrupted() && isAlive()) {
if(read>0){
synchronized (fos){
b=new byte[read];
System.arraycopy(buffer,0,b,0,read);
buffer=b;
final ByteBuffer f=ByteBuffer.wrap(b);
fos.write(f);
}
}
//track start endobj and flag so we know if object read
if(read>0){
scanStreamForObjects(firstObjLength+bytesRead, lastBuffer, buffer);
bytesRead += read;
//save last few bytes incase of overlap
int aa=30;
final int size1=buffer.length;
if(aa>size1-1) {
aa = size1 - 1;
}
lastBuffer=new byte[aa];
System.arraycopy(buffer, size1-aa, lastBuffer,0,aa);
}
percentageDone= (int) (100*(bytesRead/(float)linearfileLength));
//debug code to simulate slow file stream by slowing down read of data from file
// System.out.println("percentage="+percentageDone);
// try {
// Thread.sleep(2000);
// } catch (InterruptedException e) {
// e.printStackTrace();
// }
}
linHintTable.setFinishedReading();
} catch (final IOException e) {
LogWriter.writeLog("Exception: " + e.getMessage());
} finally{
try{
is.close();
synchronized (fos){
fos.close();
}
//possible that page still being decoded on slower machine so wait
fileAccess.waitForDecodingToFinish();
fileAccess.setIO(new PdfObjectReader());
/* get reader object to open the file if all downloaded*/
if(isAlive() && !isInterrupted()){
fileAccess.openPdfFile(tempURLFile.getAbsolutePath());
/* store fi name for use elsewhere as part of ref key without .pdf */
fileAccess.getObjectStore().storeFileName(tempURLFile.getName().substring(0, tempURLFile.getName().lastIndexOf('.')));
}
}catch(final Exception e){
LogWriter.writeLog("Exception: " + e.getMessage());
}
}
}
private void scanStreamForObjects(final int bytesRead, final byte[] lastBuffer, final byte[] buffer) {
final int bufSize=buffer.length;
for(int i=0;i