sfpacket.cpp

/*
 * Copyright (c) 2007, Technische Universitaet Berlin
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met:
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright 
 *   notice, this list of conditions and the following disclaimer in the 
 *   documentation and/or other materials provided with the distribution.
 * - Neither the name of the Technische Universitaet Berlin nor the names 
 *   of its contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 
 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/**
 * @author Philipp Huppertz <huppertz@tkn.tu-berlin.de>
 */

#include "sfpacket.h"
#include <cstring>

SFPacket::SFPacket(int pType, int pSeqno) {
    length = 0;
    seqno = pSeqno;
    type = pType;
}

// copy constructor
SFPacket::SFPacket(const SFPacket &pPacket) {
    length = pPacket.getLength();
    type = pPacket.getType();
    seqno = pPacket.getSeqno();
    setPayload(pPacket.getPayload(), length);
}

SFPacket::~SFPacket()
{
    // if (buffer) delete[] buffer;
}

const char* SFPacket::getPayload() const
{
    if(((type == SF_PACKET_ACK) || (type == SF_PACKET_NO_ACK))) {
        return buffer + 1;
    }
    else {
        return NULL;
    }
}

int SFPacket::getLength() const {
    return length;
}

int SFPacket::getType() const
{
    return type;
}

int SFPacket::getSeqno() const
{
    return seqno;
}

bool SFPacket::setPayload(const char* pBuffer, uint8_t pLength)
{
    if ((pLength > 0) && (pLength < cMaxPacketLength) && ((type == SF_PACKET_ACK) || (type == SF_PACKET_NO_ACK)))
    {
        length = pLength;
        memcpy(buffer + 1, pBuffer, pLength);
        return true;
    }
    DEBUG("SFPACKET::setPayload : wrong packet length = " << static_cast<int>(pLength) << " or type = " << type)
    return false;
}

void SFPacket::setSeqno(int pSeqno)
{
    seqno = pSeqno;
}

void SFPacket::setType(int pType)
{
    type = pType;
}

int const SFPacket::getMaxPayloadLength()
{
    return cMaxPacketLength;
}

/* == operator */
bool SFPacket::operator==(SFPacket const& pPacket)
{
    bool retval=false;
    if((pPacket.getType() == type) && (pPacket.getLength() == length) && (pPacket.getSeqno() == seqno)) {
        if((type == SF_PACKET_ACK) || (type == SF_PACKET_NO_ACK)) {
            retval = (memcmp(pPacket.getPayload(), getPayload(), length) == 0);
        }
    }
    return retval;
}

    /* return the length that shall be transmitted via TCP */
int SFPacket::getTcpLength() const {
    return length + 1;
}

/* return the payload of the TCP packet */
const char* SFPacket::getTcpPayload() {
    char l = length;
    buffer[0] = l;
    return buffer;
}