downloadclient.cpp

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                            thePrefs.GetCategory(cur_file->GetCategory())->prio > thePrefs.GetCategory(SwapTo->GetCategory())->prio ||
                            thePrefs.GetCategory(cur_file->GetCategory())->prio == thePrefs.GetCategory(SwapTo->GetCategory())->prio &&
                            (
                                cur_file->GetDownPriority() > SwapTo->GetDownPriority() ||
                                cur_file->GetDownPriority() == SwapTo->GetDownPriority() &&
                                (
                                    cur_file->GetCategory() == SwapTo->GetCategory() && cur_file->GetCategory() != 0 &&
                                    (thePrefs.GetCategory(cur_file->GetCategory())->downloadInAlphabeticalOrder && thePrefs.IsExtControlsEnabled()) && 
                                    cur_file->GetFileName() && SwapTo->GetFileName() &&
                                    cur_file->GetFileName().CompareNoCase(SwapTo->GetFileName()) < 0
                                )
                            )
                        )
                    ) {
                        if(printDebug)
                            AddDebugLogLine(DLP_VERYLOW, false, _T("oooo Debug: Higher prio."));

                        if(IsSourceRequestAllowed(cur_file) && (cur_file->AllowSwapForSourceExchange() || cur_file == reqfile) ||
                           !(IsSourceRequestAllowed(SwapTo) && (SwapTo->AllowSwapForSourceExchange() || SwapTo == reqfile)) ||
                           (GetDownloadState()==DS_ONQUEUE && GetRemoteQueueRank() <= 50)) {
                            if(printDebug)
                                AddDebugLogLine(DLP_LOW, false, _T("oooo Debug: Source Request check ok."));
                            return true;
                        } else {
                            if(printDebug)
                                AddDebugLogLine(DLP_VERYLOW, false, _T("oooo Debug: Source Request check failed."));
                            wasSkippedDueToSourceExchange = true;
                        }
                    }

                    if(IsSourceRequestAllowed(cur_file, true) && (cur_file->AllowSwapForSourceExchange() || cur_file == reqfile) &&
                       !(IsSourceRequestAllowed(SwapTo, true) && (SwapTo->AllowSwapForSourceExchange() || SwapTo == reqfile)) &&
                       (GetDownloadState()!=DS_ONQUEUE || GetDownloadState()==DS_ONQUEUE && GetRemoteQueueRank() > 50)) {
                        wasSkippedDueToSourceExchange = true;

                        if(printDebug)
                            AddDebugLogLine(DLP_LOW, false, _T("oooo Debug: Source Exchange."));
                        return true;
                    }
                } else if(printDebug) {
                    AddDebugLogLine(DLP_VERYLOW, false, _T("oooo Debug: Suspend block."));
                }
            } else if(printDebug) {
                AddDebugLogLine(DLP_VERYLOW, false, _T("oooo Debug: SwapTo is NNP and cur_file is not."));
            }
    } else if(printDebug) {
        AddDebugLogLine(DLP_VERYLOW, false, _T("oooo Debug: cur_file probably has too many sources."));
    }

    if(printDebug)
        AddDebugLogLine(DLP_LOW, false, _T("oooo Debug: Return false"));

    return false;
}
// <-- ZZ:DownloadManager

// ZZ:DownloadManager -->
bool CUpDownClient::SwapToAnotherFile(LPCTSTR reason, bool bIgnoreNoNeeded, bool ignoreSuspensions, bool bRemoveCompletely, CPartFile* toFile, bool allowSame, bool isAboutToAsk, bool debug){
    bool printDebug = debug && thePrefs.GetLogA4AF();

    //if(GetDownloadState() == DS_NONEEDEDPARTS) {
    //    printDebug = true;
    //}

    if(printDebug)
        AddDebugLogLine(DLP_LOW, false, _T("ooo Debug: Switching source \"%s\" Status %i; Remove = %s; bIgnoreNoNeeded = %s; allowSame = %s; Reason = \"%s\""), this->GetUserName(), this->GetDownloadState(), (bRemoveCompletely ? _T("Yes") : _T("No")), (bIgnoreNoNeeded ? _T("Yes") : _T("No")), (allowSame ? _T("Yes") : _T("No")), reason);

    if(!bRemoveCompletely && allowSame && thePrefs.GetA4AFSaveCpu()) {
        // Only swap if we can't keep the old source
        if(printDebug)
            AddDebugLogLine(DLP_LOW, false, _T("ooo Debug: return false since prefs setting to save cpu is enabled."));
        return false;
    }

    if(!bRemoveCompletely && allowSame && m_OtherRequests_list.IsEmpty() && (!bIgnoreNoNeeded || m_OtherNoNeeded_list.IsEmpty())) {
        // no file to swap too, and it's ok to keep it
        if(printDebug)
            AddDebugLogLine(DLP_LOW, false, _T("ooo Debug: return false due to no file to swap too, and it's ok to keep it."));
        return false;
    }

    if (!bRemoveCompletely &&
        (GetDownloadState() != DS_ONQUEUE &&
         GetDownloadState() != DS_NONEEDEDPARTS &&
         GetDownloadState() != DS_TOOMANYCONNS &&
         GetDownloadState() != DS_REMOTEQUEUEFULL &&
         GetDownloadState() != DS_CONNECTED
        )) {
        if(printDebug)
            AddDebugLogLine(DLP_LOW, false, _T("ooo Debug: return false due to wrong state."));
		return false;
    }

    bool doAgressiveSwapping = (bRemoveCompletely || !allowSame || isAboutToAsk);
    if(printDebug)
        AddDebugLogLine(DLP_LOW, false, _T("ooo Debug: doAgressiveSwapping: %s"), doAgressiveSwapping?_T("true"):_T("false"));

	CPartFile* SwapTo = NULL;
	CPartFile* cur_file = NULL;
	//int cur_prio= -1; //ZZ:DownloadManager
	POSITION finalpos = NULL;
	CTypedPtrList<CPtrList, CPartFile*>* usedList;

    if(allowSame && !bRemoveCompletely) {
        SwapTo = reqfile;
        if(printDebug)
            AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: allowSame: File %s SourceReq: %s"), reqfile->GetFileName(), IsSourceRequestAllowed(reqfile)?_T("true"):_T("false"));
    }

    bool SwapToIsNNP = (SwapTo != NULL && SwapTo == reqfile && GetDownloadState() == DS_NONEEDEDPARTS);

    CPartFile* skippedDueToSourceExchange = NULL;
    bool skippedIsNNP = false;

	if (!m_OtherRequests_list.IsEmpty()){
        if(printDebug)
            AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: m_OtherRequests_list"));

        usedList = &m_OtherRequests_list;
		for (POSITION pos = m_OtherRequests_list.GetHeadPosition();pos != 0;m_OtherRequests_list.GetNext(pos)){
			cur_file = m_OtherRequests_list.GetAt(pos);

            if(printDebug)
                AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Checking file: %s SoureReq: %s"), cur_file->GetFileName(), IsSourceRequestAllowed(cur_file)?_T("true"):_T("false"));

            if(!bRemoveCompletely && !ignoreSuspensions && allowSame && IsSwapSuspended(cur_file, doAgressiveSwapping, false)) {
                if(printDebug)
                    AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: continue due to IsSwapSuspended(file) == true"));
                continue;
            }

            if (cur_file != reqfile && theApp.downloadqueue->IsPartFile(cur_file) && !cur_file->IsStopped() 
				&& (cur_file->GetStatus(false) == PS_READY || cur_file->GetStatus(false) == PS_EMPTY))	
			{
                if(printDebug)
                    AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: It's a partfile, not stopped, etc."));

				if (toFile != NULL){
					if (cur_file == toFile){
                        if(printDebug)
                            AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Found toFile."));

                        SwapTo = cur_file;
                        SwapToIsNNP = false;
						finalpos = pos;
						break;
					}
				} else {
                    bool wasSkippedDueToSourceExchange = false;
                    if(SwapToRightFile(SwapTo, cur_file, ignoreSuspensions, SwapToIsNNP, false, wasSkippedDueToSourceExchange, doAgressiveSwapping, debug)) {
                        if(printDebug)
                            AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Swapping to file %s"), cur_file->GetFileName());

                        if(SwapTo && wasSkippedDueToSourceExchange) {
                            if(debug && thePrefs.GetLogA4AF()) AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Swapped due to source exchange possibility"));
                            bool discardSkipped = false;
                            if(SwapToRightFile(skippedDueToSourceExchange, SwapTo, ignoreSuspensions, skippedIsNNP, SwapToIsNNP, discardSkipped, doAgressiveSwapping, debug)) {
                                skippedDueToSourceExchange = SwapTo;
                                skippedIsNNP = skippedIsNNP?true:(SwapTo == reqfile && GetDownloadState() == DS_NONEEDEDPARTS);
                                if(printDebug)
                                    AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Skipped file was better than last skipped file."));
                            }
                        }

                        SwapTo = cur_file;
                        SwapToIsNNP = false;
					    finalpos=pos;
                    } else {
                        if(printDebug)
                            AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Keeping file %s"), SwapTo->GetFileName());
                        if(wasSkippedDueToSourceExchange) {
                            if(printDebug)
                                AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Kept the file due to source exchange possibility"));
                            bool discardSkipped = false;
                            if(SwapToRightFile(skippedDueToSourceExchange, cur_file, ignoreSuspensions, skippedIsNNP, false, discardSkipped, doAgressiveSwapping, debug)) {
                                skippedDueToSourceExchange = cur_file;
                                skippedIsNNP = false;
                                if(printDebug)
                                    AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Skipped file was better than last skipped file."));
                            }
                        }
                    }
                }
			}
		}
	}

    if ((!SwapTo || SwapTo == reqfile && GetDownloadState() == DS_NONEEDEDPARTS) && bIgnoreNoNeeded){
        if(printDebug)
            AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: m_OtherNoNeeded_list"));

        usedList = &m_OtherNoNeeded_list;
		for (POSITION pos = m_OtherNoNeeded_list.GetHeadPosition();pos != 0;m_OtherNoNeeded_list.GetNext(pos)){
			cur_file = m_OtherNoNeeded_list.GetAt(pos);

            if(printDebug)
                AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Checking file: %s "), cur_file->GetFileName());

            if(!bRemoveCompletely && !ignoreSuspensions && allowSame && IsSwapSuspended(cur_file, doAgressiveSwapping, true)) {
                if(printDebug)
                    AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: continue due to !IsSwapSuspended(file) == true"));
                continue;
            }

			if (cur_file != reqfile && theApp.downloadqueue->IsPartFile(cur_file) && !cur_file->IsStopped() 
				&& (cur_file->GetStatus(false) == PS_READY || cur_file->GetStatus(false) == PS_EMPTY) )	
			{
                if(printDebug)
                    AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: It's a partfile, not stopped, etc."));

				if (toFile != NULL){
					if (cur_file == toFile){
                        if(printDebug)
                            AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Found toFile."));
    
                        SwapTo = cur_file;
						finalpos = pos;
						break;
					}
				} else {
                    bool wasSkippedDueToSourceExchange = false;
                    if(SwapToRightFile(SwapTo, cur_file, ignoreSuspensions, SwapToIsNNP, true, wasSkippedDueToSourceExchange, doAgressiveSwapping, debug)) {
                        if(printDebug)
                            AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Swapping to file %s"), cur_file->GetFileName());

                        if(SwapTo && wasSkippedDueToSourceExchange) {
                            if(printDebug)
                                AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Swapped due to source exchange possibility"));
                            bool discardSkipped = false;
                            if(SwapToRightFile(skippedDueToSourceExchange, SwapTo, ignoreSuspensions, skippedIsNNP, SwapToIsNNP, discardSkipped, doAgressiveSwapping, debug)) {
                                skippedDueToSourceExchange = SwapTo;
                                skippedIsNNP = skippedIsNNP?true:(SwapTo == reqfile && GetDownloadState() == DS_NONEEDEDPARTS);
                                if(printDebug)
                                    AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Skipped file was better than last skipped file."));
                            }
                        }

                        SwapTo = cur_file;
                        SwapToIsNNP = true;
					    finalpos=pos;
                    } else {
                        if(printDebug)
                            AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Keeping file %s"), SwapTo->GetFileName());
                        if(wasSkippedDueToSourceExchange) {
                            if(debug && thePrefs.GetVerbose()) AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Kept the file due to source exchange possibility"));
                            bool discardSkipped = false;
                            if(SwapToRightFile(skippedDueToSourceExchange, cur_file, ignoreSuspensions, skippedIsNNP, true, discardSkipped, doAgressiveSwapping, debug)) {
                                skippedDueToSourceExchange = cur_file;
                                skippedIsNNP = true;
                                if(printDebug)
                                    AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Skipped file was better than last skipped file."));
                            }
                        }
                    }
				}
			}
		}
	}

    if (SwapTo){
        if(printDebug) {
            if(SwapTo != reqfile) {
                AddDebugLogLine(DLP_LOW, false, _T("ooo Debug: Found file to swap to %s"), SwapTo->GetFileName());
            } else {
                AddDebugLogLine(DLP_LOW, false, _T("ooo Debug: Will keep current file. %s"), SwapTo->GetFileName());
            }
        }

		CString strInfo(reason);
        if(skippedDueToSourceExchange) {
            bool wasSkippedDueToSourceExchange = false;
            bool skippedIsBetter = SwapToRightFile(SwapTo, skippedDueToSourceExchange, ignoreSuspensions, SwapToIsNNP, skippedIsNNP, wasSkippedDueToSourceExchange, doAgressiveSwapping, debug);
            if(skippedIsBetter || wasSkippedDueToSourceExchange) {
                SwapTo->SetSwapForSourceExchangeTick();
                strInfo = _T("******SourceExchange-Swap****** ") + strInfo;
                if(printDebug) {
                    AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Due to sourceExchange."));
                } else if(thePrefs.GetLogA4AF() && reqfile == SwapTo) {
                    AddDebugLogLine(DLP_LOW, false, _T("ooo Didn't swap source due to source exchange possibility. '%s' Status %i; Remove = %s '%s' Reason: %s"), this->GetUserName(), this->GetDownloadState(), (bRemoveCompletely ? _T("Yes") : _T("No") ), (this->reqfile)?this->reqfile->GetFileName():_T("null"), strInfo);
                }
            } else if(printDebug) {
				AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Normal. SwapTo better than skippedDueToSourceExchange."));
            }
        } else if(printDebug) {
			AddDebugLogLine(DLP_VERYLOW, false, _T("ooo Debug: Normal. skippedDueToSourceExchange == NULL"));
        }

		if (SwapTo != reqfile && DoSwap(SwapTo,bRemoveCompletely, strInfo)){
            if(debug && thePrefs.GetLogA4AF()) AddDebugLogLine(DLP_LOW, false, _T("ooo Debug: Swap successful."));
			usedList->RemoveAt(finalpos);
			return true;
        } else if(printDebug) {
            AddDebugLogLine(DLP_LOW, false, _T("ooo Debug: Swap didn't happen."));
        }
    }

    if(printDebug)
        AddDebugLogLine(DLP_LOW, false, _T("ooo Debug: Done \"%s\""), this->GetUserName());

	return false;
}
// <-- ZZ:DownloadManager

bool CUpDownClient::DoSwap(CPartFile* SwapTo, bool bRemoveCompletely, LPCTSTR reason) // ZZ:DownloadManager
{
    if (thePrefs.GetLogA4AF()) // ZZ:DownloadManager
        AddDebugLogLine(DLP_LOW, false, _T("ooo Swapped source '%s' Status %i; Remove = %s '%s'   -->   %s Reason: %s"), this->GetUserName(), this->GetDownloadState(), (bRemoveCompletely ? _T("Yes") : _T("No") ), (this->reqfile)?this->reqfile->GetFileName():_T("null"), SwapTo->GetFileName(), reason); // ZZ:DownloadManager

	// 17-Dez-2003 [bc]: This "reqfile->srclists[sourcesslot].Find(this)" was the only place where 
	// the usage of the "CPartFile::srclists[100]" is more effective than using one list. If this
	// function here is still (again) a performance problem there is a more effective way to handle
	// the 'Find' situation. Hint: usage of a node ptr which is stored in the CUpDownClient.
	POSITION pos = reqfile->srclist.Find(this);
	if(pos)
    {
    	reqfile->srclist.RemoveAt(pos);
    } else {
        AddDebugLogLine(DLP_HIGH, true, _T("o-o Unsync between parfile->srclist and client otherfiles list. Swapping client where client has file as reqfile, but file doesn't have client in srclist. '%s' Status %i; Remove = %s '%s'   -->   '%s'  SwapReason: %s"), this->GetUserName(), this->GetDownloadState(), (bRemoveCompletely ? _T("Yes") : _T("No") ), (this->reqfile)?this->reqfile->GetFileName():_T("null"), SwapTo->GetFileName(), reason); // ZZ:DownloadManager
    }

	// remove this client from the A4AF list of our new reqfile
	POSITION pos2 = SwapTo->A4AFsrclist.Find(this);
	if (pos2) {
		SwapTo->A4AFsrclist.RemoveAt(pos2);
    } else {
        AddDebugLogLine(DLP_HIGH, true, _T("o-o Unsync between parfile->srclist and client otherfiles list. Swapping client where client has file in another list, but file doesn't have client in a4af srclist. '%s' Status %i; Remove = %s '%s'   -->   '%s'  SwapReason: %s"), this->GetUserName(), this->GetDownloadState(), (bRemoveCompletely ? _T("Yes") : _T("No") ), (this->reqfile)?this->reqfile->GetFileName():_T("null"), SwapTo->GetFileName(), reason); // ZZ:DownloadManager
    }
	theApp.emuledlg->transferwnd->downloadlistctrl.RemoveSource(this,SwapTo);

	reqfile->RemoveDownloadingSource(this);

	if(!bRemoveCo