org.jpos.iso.AsciiHexInterpreter Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jpos Show documentation
Show all versions of jpos Show documentation
jPOS is an ISO-8583 based financial transaction
library/framework that can be customized and
extended in order to implement financial interchanges.
/*
* jPOS Project [http://jpos.org]
* Copyright (C) 2000-2016 Alejandro P. Revilla
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see .
*/
package org.jpos.iso;
/**
* Implements Hex Interpreter. The Hex digits are stored in ASCII.
*
* @author joconnor
* @version $Revision$ $Date$
*/
public class AsciiHexInterpreter implements BinaryInterpreter
{
/** An instance of this Interpreter. Only one needed for the whole system */
public static final AsciiHexInterpreter INSTANCE = new AsciiHexInterpreter();
/** 0-15 to ASCII hex digit lookup table. */
private static final byte[] HEX_ASCII = new byte[] {
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
0x38, 0x39, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46
};
/**
* Converts the binary data into ASCII hex digits.
*/
public void interpret(byte[] data, byte[] b, int offset)
{
for (int i = 0; i < data.length; i++) {
b[offset + i * 2] = HEX_ASCII[(data[i] & 0xF0) >> 4];
b[offset + i * 2 + 1] = HEX_ASCII[data[i] & 0x0F];
}
}
/**
* Converts the ASCII hex digits into binary data.
*/
public byte[] uninterpret(byte[] rawData, int offset, int length)
{
byte[] d = new byte[length];
for (int i=0; i>1] |= Character.digit((char) rawData[offset+i], 16) << shift;
}
return d;
}
/**
* Returns double nBytes because the hex representation of 1 byte needs 2 hex digits.
*
*/
public int getPackedLength(int nBytes)
{
return nBytes * 2;
}
}