com.idrsolutions.image.jpeg2000.JPXBitReader Maven / Gradle / Ivy
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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 1997-2015 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
*
* ---------------
* JPXBitReader.java
* ---------------
*/
package com.idrsolutions.image.jpeg2000;
/**
* JPEG bitwise reader
*/
public class JPXBitReader {
private int p; //pointer
private final byte[] data;
private int bufferSize;
private int buffer;
public JPXBitReader(byte[] data) {
this.data = data;
}
public JPXBitReader(byte data) {
this(new byte[]{data});
}
public int readBits(int lenToRead) {
while (bufferSize < lenToRead) {
final int b = data[p] & 0xff;
p++;
buffer = (buffer << 8) | b;
bufferSize += 8;
}
bufferSize -= lenToRead;
return (buffer >>> bufferSize) & ((1 << lenToRead) - 1);
}
public void reset() {
p = 0;
}
public static void main(String[] args) {
final JPXBitReader r = new JPXBitReader(new byte[]{44, 19});
System.out.println(r.readBits(5));
System.out.println(r.readBits(11));
}
}