/*
* jPOS Project [http://jpos.org]
* Copyright (C) 2000-2017 jPOS Software SRL
*
* 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 <http://www.gnu.org/licenses/>.
*/
package org.jpos.iso;
/**
* This interface is used to encode and decode length prefixes.
*
* @author joconnor
* @version $Revision$ $Date$
*/
public interface Prefixer
{
/**
* Fills a byte array with the field length data in raw form.
*
* @param length
* The length to be encoded.
* @param b
* The byte array to fill with the encoded length.
*/
void encodeLength(int length, byte[] b) throws ISOException;
/**
* Decodes an encoded length.
*
* @param b
* The byte array to scan for the length.
* @param offset
* The offset to start scanning from.
* @return The length in chars of the field data to follow this
* LengthPrefix.
*/
int decodeLength(byte[] b, int offset) throws ISOException;
/**
* Returns the number of bytes taken up by the length encoding.
*/
int getPackedLength();
}