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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/java-pdf-library-support/
*
* (C) Copyright 1997-2013, IDRsolutions and Contributors.
*
* This file is part of JPedal
*
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
*
* ---------------
* RandomAccessFileChannelBuffer.java
* ---------------
*/
package org.jpedal.io;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import org.jpedal.utils.LogWriter;
public class RandomAccessFileChannelBuffer implements RandomAccessBuffer {
// private byte[] data;
private long pointer;
private int length = 0;
private ByteBuffer mb;
public RandomAccessFileChannelBuffer(InputStream inFile) {
try {
this.length = inFile.available();
this.mb = ByteBuffer.allocate(this.length);
int read;
byte[] buffer = new byte[4096];
while ((read = inFile.read(buffer)) != -1) {
if (read > 0) {
for (int i = 0; i < read; i++)
this.mb.put(buffer[i]);
}
}
}
catch (Exception e) {
// tell user and log
if (LogWriter.isOutput()) LogWriter.writeLog("Exception: " + e.getMessage());
}
}
@Override
public long getFilePointer() throws IOException {
return this.pointer;
}
@Override
public void seek(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 (this.mb != null) {
this.mb = null;
}
this.pointer = -1;
}
@Override
public void finalize() {
try {
super.finalize();
}
catch (Throwable e) {
// tell user and log
if (LogWriter.isOutput()) LogWriter.writeLog("Exception: " + e.getMessage());
}
// ensure removal actual file
try {
close();
}
catch (IOException e) {
// tell user and log
if (LogWriter.isOutput()) LogWriter.writeLog("Exception: " + e.getMessage());
}
} /**/
@Override
public long length() throws IOException {
if (this.mb != null) {
return this.length;
}
else {
throw new IOException("Data buffer not initialized.");
}
}
@Override
public int read() throws IOException {
if (checkPos(this.pointer)) {
this.mb.position((int) this.pointer);
this.pointer++;
return this.mb.get();
}
else {
return -1;
}
}
private int peek() throws IOException {
if (checkPos(this.pointer)) {
this.mb.position((int) this.pointer);
return this.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 {
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(byte[] b) throws IOException {
if (this.mb == null) throw new IOException("Data buffer not initialized.");
if (this.pointer < 0 || this.pointer >= this.length) return -1;
int length = this.length - (int) this.pointer;
if (length > b.length) length = b.length;
for (int i = 0; i < length; i++) {
this.mb.position((int) this.pointer);
this.pointer++;
b[i] = this.mb.get();
}
return length;
}
private static int b2i(byte b) {
if (b >= 0) return b;
return 256 + b;
}
private boolean checkPos(long pos) throws IOException {
return ((pos >= 0) && (pos < length()));
}
/* returns the byte data */
@Override
public byte[] getPdfBuffer() {
byte[] bytes = new byte[this.length];
this.mb.position(0);
this.mb.get(bytes);
return bytes;
}
}