org.jpedal.io.RandomAccessFCTest Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of OpenViewerFX Show documentation
Show all versions of OpenViewerFX Show documentation
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 1997-2016 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
*
* ---------------
* RandomAccessFCTest.java
* ---------------
*/
package org.jpedal.io;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import org.jpedal.utils.LogWriter;
public class RandomAccessFCTest implements RandomAccessBuffer {
//private byte[] data;
private long pointer;
private int length;
private FileChannel fc;
private MappedByteBuffer mb;
public RandomAccessFCTest(final FileInputStream inFile)
{
try{
length=inFile.available();
fc= (inFile).getChannel();
mb = fc.map( FileChannel.MapMode.READ_ONLY, 0L, fc.size( ) );
}catch(final Exception e){
LogWriter.writeLog("Exception: " + e.getMessage());
}
}
@Override
public long getFilePointer() throws IOException {
return pointer;
}
@Override
public void seek(final long pos) throws IOException {
if ( checkPos(pos) ) {
this.pointer = pos;
} else {
throw new IOException("Position out of bounds");
}
}
@Override
public void close() throws IOException {
if(fc !=null){
fc.close();
fc =null;
}
if(mb !=null){
mb =null;
}
this.pointer = -1;
}
/**/
@Override
protected void finalize(){
try {
super.finalize();
} catch (final Throwable e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
//ensure removal actual file
try {
close();
} catch (final IOException e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
}
@Override
public long length() throws IOException {
if (mb !=null) {
return length;
} else {
throw new IOException("Data buffer not initialized.");
}
}
@Override
public int read() throws IOException {
if (checkPos(this.pointer)) {
mb.position((int)pointer);
pointer++;
return mb.get();
} else {
return -1;
}
}
private int peek() throws IOException {
if (checkPos(this.pointer)) {
mb.position((int)pointer);
return mb.get();
} else {
return -1;
}
}
/**
* return next line (returns null if no line)
*/
@Override
public String readLine() throws IOException {
if (this.pointer >= this.length - 1) {
return null;
} else {
final StringBuilder buf = new StringBuilder();
int c;
while ((c = read()) >= 0) {
if ((c == 10) || (c == 13)) {
if (((peek() == 10) || (peek() == 13)) && (peek() != c)) {
read();
}
break;
}
buf.append((char) c);
}
return buf.toString();
}
}
@Override
public int read(final byte[] b) throws IOException {
if (mb ==null) {
throw new IOException("Data buffer not initialized.");
}
if (pointer<0 || pointer>=length) {
return -1;
}
int length=this.length-(int)pointer;
if(length>b.length) {
length = b.length;
}
for (int i=0; i=0) && (pos