001/*
002 * jPOS Project [http://jpos.org]
003 * Copyright (C) 2000-2026 jPOS Software SRL
004 *
005 * This program is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU Affero General Public License as
007 * published by the Free Software Foundation, either version 3 of the
008 * License, or (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013 * GNU Affero General Public License for more details.
014 *
015 * You should have received a copy of the GNU Affero General Public License
016 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
017 */
018
019package org.jpos.iso.channel;
020
021import org.jpos.iso.BaseChannel;
022import org.jpos.iso.ISOException;
023
024import java.io.IOException;
025
026/**
027 * Implements Record Boundary Preservation protocol
028 */
029public class RBPChannel extends BaseChannel {
030    static final byte[] PROTOCOL_IDENTIFIER = new byte[] {(byte) 0xd0, 0x4a };
031    static final byte[] MORE = new byte[] {(byte) 0x01, 0x00 };
032    static final byte[] LAST = new byte[] {(byte) 0x00, 0x00 };
033    protected void sendMessageLength(int len) throws IOException {
034        serverOut.write (PROTOCOL_IDENTIFIER);
035        serverOut.write (len >> 8);
036        serverOut.write (len);
037        serverOut.write (LAST);
038    }
039    protected int getMessageLength() throws IOException, ISOException {
040        byte[] b = new byte[6];
041        serverIn.readFully(b,0,6);
042        return ((int)b[2] &0xFF) << 8 | (int)b[3] &0xFF;
043    }
044}