[#64] Internal FDD improvements and bugfixes (Part 24: Added missing …

…support for track unscanning/rescanning)

Main/src/FDD.cpp

@@ -725,6 +725,22 @@ error:				switch (const TStdWinError err=::GetLastError()){
 		return	__getScannedTrack__(cyl,head)!=nullptr;
 	}
 
+	TStdWinError CFDD::UnscanTrack(TCylinder cyl,THead head){
+		// disposes internal representation of specified Track if possible (e.g. can't if Track already modified); returns Windows standard i/o error
+		EXCLUSIVELY_LOCK_THIS_IMAGE();
+		const PInternalTrack pit=__getScannedTrack__(cyl,head);
+		if (!pit) // Track not yet scanned?
+			return ERROR_SEEK;
+		for( TSector i=0; i<pit->nSectors; i++ )
+			if (pit->sectors[i].IsModified())
+				return ERROR_REQUEST_REFUSED;
+		if (const TStdWinError err=__super::UnscanTrack(cyl,head)) // base
+			return err;
+		delete pit;
+		internalTracks[cyl][head]=nullptr;
+		return ERROR_SUCCESS;
+	}
+
 	void CFDD::__setWaitingForIndex__() const{
 		// sets waiting for the index pulse before executing the next command
 		LOG_ACTION(_T("void CFDD::__setWaitingForIndex__"));

Main/src/FDD.h

@@ -130,6 +130,7 @@
 		TStdWinError SeekHeadsHome() const override;
 		TSector ScanTrack(TCylinder cyl,THead head,Codec::PType pCodec=nullptr,PSectorId bufferId=nullptr,PWORD bufferLength=nullptr,PLogTime startTimesNanoseconds=nullptr,PBYTE pAvgGap3=nullptr) const override;
 		bool IsTrackScanned(TCylinder cyl,THead head) const override;
+		TStdWinError UnscanTrack(TCylinder cyl,THead head) override;
 		void GetTrackData(TCylinder cyl,THead head,Revolution::TType rev,PCSectorId bufferId,PCBYTE bufferNumbersOfSectorsToSkip,TSector nSectors,PSectorData *outBufferData,PWORD outBufferLengths,TFdcStatus *outFdcStatuses,TLogTime *outDataStarts) override;
 		TDataStatus IsSectorDataReady(TCylinder cyl,THead head,RCSectorId id,BYTE nSectorsToSkip,Revolution::TType rev) const override;
 		TStdWinError MarkSectorAsDirty(RCPhysicalAddress chs,BYTE nSectorsToSkip,PCFdcStatus pFdcStatus) override;