122 lines
4.0 KiB
C++
122 lines
4.0 KiB
C++
/**
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* @file VirtualChannelReception.cpp
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* @brief This file defines the VirtualChannelReception class.
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* @date 26.03.2013
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* @author baetz
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*/
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#include "../datalinklayer/BCFrame.h"
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#include "../datalinklayer/VirtualChannelReception.h"
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#include "../serviceinterface/ServiceInterfaceStream.h"
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VirtualChannelReception::VirtualChannelReception(uint8_t setChannelId,
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uint8_t setSlidingWindowWidth) :
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channelId(setChannelId), slidingWindowWidth(setSlidingWindowWidth), positiveWindow(
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setSlidingWindowWidth / 2), negativeWindow(setSlidingWindowWidth / 2), currentState(
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&openState), openState(this), waitState(this), lockoutState(this), vR(0), farmBCounter(
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0) {
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internalClcw.setVirtualChannel(channelId);
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}
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ReturnValue_t VirtualChannelReception::mapDemultiplexing(TcTransferFrame* frame) {
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uint8_t mapId = frame->getMAPId();
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mapChannelIterator iter = mapChannels.find(mapId);
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if (iter == mapChannels.end()) {
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// error << "VirtualChannelReception::mapDemultiplexing on VC " << std::hex << (int) channelId
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// << ": MapChannel " << (int) mapId << std::dec << " not found." << std::endl;
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return VC_NOT_FOUND;
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} else {
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return (iter->second)->extractPackets(frame);
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}
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}
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ReturnValue_t VirtualChannelReception::doFARM(TcTransferFrame* frame, ClcwIF* clcw) {
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uint8_t bypass = frame->bypassFlagSet();
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uint8_t controlCommand = frame->controlCommandFlagSet();
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uint8_t typeValue = (bypass << 1) + controlCommand;
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switch (typeValue) {
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case AD_FRAME:
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return currentState->handleADFrame(frame, clcw);
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case BD_FRAME:
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return handleBDFrame(frame, clcw);
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case BC_FRAME:
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return handleBCFrame(frame, clcw);
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default:
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return ILLEGAL_FLAG_COMBINATION;
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}
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}
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ReturnValue_t VirtualChannelReception::frameAcceptanceAndReportingMechanism(TcTransferFrame* frame,
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ClcwIF* clcw) {
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ReturnValue_t result = RETURN_OK;
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result = doFARM(frame, &internalClcw);
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internalClcw.setReceiverFrameSequenceNumber(vR);
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internalClcw.setFarmBCount(farmBCounter);
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clcw->setWhole(internalClcw.getAsWhole());
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switch (result) {
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case RETURN_OK:
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return mapDemultiplexing(frame);
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case BC_IS_SET_VR_COMMAND:
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case BC_IS_UNLOCK_COMMAND:
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//Need to catch these codes to avoid error reporting later.
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return RETURN_OK;
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default:
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break;
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}
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return result;
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}
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ReturnValue_t VirtualChannelReception::addMapChannel(uint8_t mapId, MapPacketExtractionIF* object) {
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std::pair<mapChannelIterator, bool> returnValue = mapChannels.insert(
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std::pair<uint8_t, MapPacketExtractionIF*>(mapId, object));
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if (returnValue.second == true) {
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return RETURN_OK;
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} else {
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return RETURN_FAILED;
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}
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}
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ReturnValue_t VirtualChannelReception::handleBDFrame(TcTransferFrame* frame, ClcwIF* clcw) {
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farmBCounter++;
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return RETURN_OK;
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}
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ReturnValue_t VirtualChannelReception::handleBCFrame(TcTransferFrame* frame, ClcwIF* clcw) {
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BcFrame content;
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ReturnValue_t returnValue = content.initialize(frame->getFullDataField(),
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frame->getFullDataLength());
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if (returnValue == BC_IS_UNLOCK_COMMAND) {
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returnValue = currentState->handleBCUnlockCommand(clcw);
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} else if (returnValue == BC_IS_SET_VR_COMMAND) {
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returnValue = currentState->handleBCSetVrCommand(clcw, content.vR);
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} else {
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//Do nothing
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}
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return returnValue;
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}
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uint8_t VirtualChannelReception::getChannelId() const {
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return channelId;
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}
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ReturnValue_t VirtualChannelReception::initialize() {
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ReturnValue_t returnValue = RETURN_FAILED;
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if ((slidingWindowWidth > 254) || (slidingWindowWidth % 2 != 0)) {
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sif::error << "VirtualChannelReception::initialize: Illegal sliding window width: "
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<< (int) slidingWindowWidth << std::endl;
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return RETURN_FAILED;
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}
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for (mapChannelIterator iterator = mapChannels.begin(); iterator != mapChannels.end();
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iterator++) {
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returnValue = iterator->second->initialize();
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if (returnValue != RETURN_OK)
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break;
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}
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return returnValue;
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}
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void VirtualChannelReception::setToWaitState() {
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internalClcw.setWaitFlag(true);
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this->currentState = &waitState;
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}
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