in_vgm: fix

I'm now reloading the file if the "last write time" has changed.

VGMPlay/VGMPlay_Updates.txt

@@ -170,3 +170,4 @@ Updates since 0.4.0u8 (16.04.2017)
 - fixed SN76496 variant being incorrectly called NCR7496 instead of NCR8496
 - [in_vgm] made "Tag fallback" option work (finally, after 5 years!)
 - [in_vgm] made "disable file information cache" option selectable via configuration
+- [in_vgm] fix VGM information dialog using cached data even if file was changed

in_vgm/dlg_fileinfo.c

@@ -25,6 +25,7 @@ typedef struct fileinfo_data
 	wchar_t* FileName;
 	bool ForceReload;
 
+	FILETIME FileTime;
 	UINT32 FileSize;
 	VGM_HEADER Head;
 	GD3_TAG Tag;
@@ -238,14 +239,33 @@ static bool LoadInfoA(const char* FileName, FINF_DATA* FileInf)
 
 static bool LoadInfoW(const wchar_t* FileName, FINF_DATA* FileInf)
 {
+	HANDLE hFile;
+	FILETIME fileWrtTime;
 	VGM_HEADER* FH;
 	UINT32 StrSize;
 	INT32 TempSLng;
 
+	hFile = CreateFileW(FileName, 0, FILE_SHARE_READ | FILE_SHARE_WRITE,
+						NULL, OPEN_EXISTING, 0, NULL);
+	if (hFile != INVALID_HANDLE_VALUE)
+	{
+		GetFileTime(hFile, NULL, NULL, &fileWrtTime);
+		CloseHandle(hFile);	hFile = NULL;
+	}
+	else
+	{
+		fileWrtTime.dwLowDateTime = 0x00;
+		fileWrtTime.dwHighDateTime = 0x00;
+	}
+
 	if (! FileInf->ForceReload && ! Options.NoInfoCache)
 	{
 		if (FileInf->FileName != NULL && ! _wcsicmp(FileInf->FileName, FileName))
-			return true;	// I just loaded that file.
+		{
+			// We just loaded that file.
+			if (CompareFileTime(&fileWrtTime, &FileInf->FileTime) == 0)
+				return true;	// The file wasn't changed, so don't reload.
+		}
 	}
 	FileInf->ForceReload = false;
 
@@ -268,6 +288,7 @@ static bool LoadInfoW(const wchar_t* FileName, FINF_DATA* FileInf)
 
 			// copy all info from PlayVGMInfo to current structure
 			// (advanced caching) ;)
+			FileInf->FileTime = PlayVGMInfo.FileTime;
 			FileInf->FileSize = PlayVGMInfo.FileSize;
 			FileInf->Head = PlayVGMInfo.Head;
 			CopyTagData(&FileInf->Tag, &PlayVGMInfo.Tag);
@@ -292,6 +313,8 @@ static bool LoadInfoW(const wchar_t* FileName, FINF_DATA* FileInf)
 
 	if (! FileInf->FileSize)
 	{
+		FileInf->FileTime.dwLowDateTime = 0x00;
+		FileInf->FileTime.dwHighDateTime = 0x00;
 		FileInf->FileSize = 0x00;
 		memset(&FileInf->Head, 0x00, sizeof(VGM_HEADER));
 		memset(&FileInf->Tag, 0x00, sizeof(GD3_TAG));
@@ -310,6 +333,7 @@ static bool LoadInfoW(const wchar_t* FileName, FINF_DATA* FileInf)
 			wcscpy(FileInf->Tag.strNotes, L"File invalid!");
 		return false;
 	}
+	FileInf->FileTime = fileWrtTime;
 
 	FH = &FileInf->Head;
 	FileInf->TrackLen = CalcSampleMSecExt(FH->lngTotalSamples, 0x02, FH);