DSMAP.c

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#include "main.h"
#include "802_22.h"
typedef struct stru_ExtentedDSMAPIE
{
    DSMAP_IE* pstruDSMAPIE;
    struct stru_ExtentedDSMAPIE* pstruNext;
}ExtendedDSIE;
/** The DS-MAP message defines the access to the downstream information. 
The length of the DS-MAP shall be an integer number of bytes. */
NetSim_PACKET* fn_NetSim_CR_FormDSMAP(NETSIM_ID nDeviceId, NETSIM_ID nInterfaceId)
{
    BS_PHY* pstruBSPhy;
    BS_MAC* pstruBSMAC;
    unsigned int nDSIECount=0;
    NetSim_PACKET* pstruPacket;
    unsigned int nPacketSize;
    unsigned int nSID;
    int nDSBurst;
    unsigned int SlotRequire;
    ExtendedDSIE *pstruDSMAPIE = NULL;
    ExtendedDSIE *pstruTempDSMAPIE = NULL;
    ExtendedDSIE *pstruFirstDSMAPIE = NULL;
    pstruBSPhy = DEVICE_PHYVAR(nDeviceId,nInterfaceId);
    pstruBSMAC = DEVICE_MACVAR(nDeviceId,nInterfaceId);
    //Allocate memory for DS-MAP
    pstruBSMAC->pstruDSMAP = fnpAllocateMemory(1,sizeof(DSMAP));
    pstruBSMAC->pstruDSMAP->nManagementMessageType = MMM_DS_MAP%10;
    pstruBSMAC->pstruDSMAP->nPaddingBits = 0;
 
    //Loop through access buffer
    while(pstruBSMAC->pstruDSPacketList)
    {
        pstruPacket = pstruBSMAC->pstruDSPacketList;
        UINT destCount;
        NETSIM_ID* dest = get_dest_from_packet(pstruPacket, &destCount);
        UINT i;
        nSID = 0;
        for (i = 0; i < destCount; i++)
        {
            nSID = pstruBSMAC->anSIDFromDevId[dest[i]];
            if (nSID)
                break;
        }
        if (!nSID)
        {
            if (!isBroadcastPacket(pstruPacket))
            {
                //The packet is not for this BS
                pstruBSMAC->pstruDSPacketList = pstruBSMAC->pstruDSPacketList->pstruNextPacket;
                pstruPacket->pstruNextPacket = NULL;
                fn_NetSim_Packet_FreePacket(pstruPacket);
                continue;
            }
        }
        //Set the receiver id
        pstruPacket->nReceiverId = destCount > 1 ? 0 : dest[0];
        pstruPacket->nTransmitterId = nDeviceId;
    
        nPacketSize = (unsigned int)fnGetPacketSize(pstruPacket);
 
        if (pstruBSPhy->nFrameNumber == 0)// for considering SCH & preamble
            nDSBurst = fn_NetSim_CR_FillDSFrame(nPacketSize, pstruBSMAC->pstruDSBurst, pstruBSPhy->pstruSymbolParameter, 4, &SlotRequire);
        else
            nDSBurst = fn_NetSim_CR_FillDSFrame(nPacketSize, pstruBSMAC->pstruDSBurst, pstruBSPhy->pstruSymbolParameter, 2, &SlotRequire);
 
        if (nDSBurst)
        {
            //Allocated
            pstruBSMAC->pstruDSPacketList = pstruBSMAC->pstruDSPacketList->pstruNextPacket;
            pstruPacket->pstruNextPacket = NULL;
            fn_NetSim_CR_AddPacketToDSBurst(pstruBSMAC->pstruDSBurst[nDSBurst],pstruPacket);
            //Prepare the DS-MAP IE
            pstruTempDSMAPIE = calloc(1,sizeof *pstruTempDSMAPIE);
            pstruTempDSMAPIE->pstruDSMAPIE = calloc(1,sizeof *pstruTempDSMAPIE->pstruDSMAPIE);
            pstruTempDSMAPIE->pstruDSMAPIE->SID = nSID;
            pstruTempDSMAPIE->pstruDSMAPIE->length = SlotRequire;
            nDSIECount++;
            if(!pstruFirstDSMAPIE)
            {
                pstruFirstDSMAPIE = pstruTempDSMAPIE;
                pstruDSMAPIE = pstruFirstDSMAPIE;
            }
            else
            {
                pstruDSMAPIE->pstruNext = pstruTempDSMAPIE;
                pstruDSMAPIE = pstruTempDSMAPIE;
            }
        }
        else
            break; // No space available in DS-Frame
    }
    pstruBSMAC->pstruDSMAP->nIECount = nDSIECount;
    if(nDSIECount)
        pstruBSMAC->pstruDSMAP->pstruIE = calloc(nDSIECount,sizeof(DSMAP_IE*));
    nDSIECount = 0;
    while(pstruFirstDSMAPIE)
    {
        pstruBSMAC->pstruDSMAP->pstruIE[nDSIECount++] = pstruFirstDSMAPIE->pstruDSMAPIE;
        pstruTempDSMAPIE = pstruFirstDSMAPIE;
        pstruFirstDSMAPIE = pstruFirstDSMAPIE->pstruNext;
        free(pstruTempDSMAPIE);
    }
    return fn_NetSim_CR_GenerateBroadcastCtrlPacket(nDeviceId,nInterfaceId,MMM_DS_MAP);
}
int fn_NetSim_CR_CPE_ProcessDSMAP()
{
    return 1;
}