address a few more issues found by static analysis

* mark move constructors and operators noexcept.
* eliminate large stack allocations in several places.
* some incorrect checks for Windows handles.

CMakeLists.txt

@@ -299,6 +299,13 @@ if( MSVC )
 	# These must be silenced because the code is full of them. Expect some of undefined behavior hidden in this mess. :(
 	#set( ALL_C_FLAGS "${ALL_C_FLAGS} /wd4244 /wd4018 /wd4267" )
 
+	# annoying intellisense warnings that are virtually always false positives and mostly happen in third party code.
+	#6297: overflow when shifting
+	#6386: Buffer overrun when writing (i.e. missing range check for array writes)
+	#6385: Reading invalid data (i.e. missing range check for array reads)
+	#6308: missing null check on realloc
+	set( ALL_C_FLAGS "${ALL_C_FLAGS} /wd6297 /wd6386 /wd6385 /wd6308" ) 
+
 
 	# Most of these need to be cleaned out. The source is currently infested with far too much conditional compilation which is a constant source of problems.
 	set( ALL_C_FLAGS "${ALL_C_FLAGS} /DUSE_OPENGL=1 /DNOASM=1 /DWIN32" )

source/common/audio/music/i_soundfont.cpp

@@ -465,20 +465,17 @@ const FSoundFontInfo *FSoundFontManager::FindSoundFont(const char *name, int all
 //
 //==========================================================================
 
-FSoundFontReader *FSoundFontManager::OpenSoundFont(const char *name, int allowed)
+FSoundFontReader *FSoundFontManager::OpenSoundFont(const char *const name, int allowed)
 {
-
+	if (name == nullptr) return nullptr;
 	// First check if the given name is inside the loaded resources.
 	// To avoid clashes this will only be done if the name has the '.cfg' extension.
 	// Sound fonts cannot be loaded this way.
-	if (name != nullptr)
-	{
 	const char *p = name + strlen(name) - 4;
 	if (p > name && !stricmp(p, ".cfg") && fileSystem.CheckNumForFullName(name) >= 0)
 	{
 		return new FLumpPatchSetReader(name);
 	}
-	}
 
 	// Next check if the file is a .sf file
 	if (allowed & SF_SF2)

source/common/audio/music/music.cpp

@@ -432,14 +432,14 @@ static FString ReplayGainHash(ZMusicCustomReader* reader, int flength, int playe
 {
 	std::string playparam = _playparam;
 
-	uint8_t buffer[50000];	// for performance reasons only hash the start of the file. If we wanted to do this to large waveform songs it'd cause noticable lag.
+	TArray<uint8_t> buffer(50000, true);	// for performance reasons only hash the start of the file. If we wanted to do this to large waveform songs it'd cause noticable lag.
 	uint8_t digest[16];
 	char digestout[33];
-	auto length = reader->read(reader, buffer, 50000);
+	auto length = reader->read(reader, buffer.data(), 50000);
 	reader->seek(reader, 0, SEEK_SET);
 	MD5Context md5;
 	md5.Init();
-	md5.Update(buffer, (int)length);
+	md5.Update(buffer.data(), (int)length);
 	md5.Final(digest);
 
 	for (size_t j = 0; j < sizeof(digest); ++j)
@@ -448,7 +448,7 @@ static FString ReplayGainHash(ZMusicCustomReader* reader, int flength, int playe
 	}
 	digestout[32] = 0;
 
-	auto type = ZMusic_IdentifyMIDIType((uint32_t*)buffer, 32);
+	auto type = ZMusic_IdentifyMIDIType((uint32_t*)buffer.data(), 32);
 	if (type == MIDI_NOTMIDI) return FStringf("%d:%s", flength, digestout);
 
 	// get the default for MIDI synth

source/common/filesystem/source/ancientzip.cpp

@@ -45,6 +45,7 @@
 
 #include <stdlib.h>
 #include <assert.h>
+#include <memory>
 #include "ancientzip.h"
 
 namespace FileSys {
@@ -342,10 +343,19 @@ int FZipExploder::Explode(unsigned char *out, unsigned int outsize,
 
 int ShrinkLoop(unsigned char *out, unsigned int outsize, FileReader &_In, unsigned int InLeft)
 {
-	FileReader *In = &_In;
+	// don't allocate this on the stack, it's a bit on the large side.
+	struct work
+	{
 		unsigned char ReadBuf[256];
 		unsigned short Parent[HSIZE];
 		unsigned char Value[HSIZE], Stack[HSIZE];
+	};
+	auto s = std::make_unique<work>();
+	unsigned char* ReadBuf = s->ReadBuf;
+	unsigned short* Parent = s->Parent;
+	unsigned char* Value = s->Value, * Stack = s->Stack;
+
+	FileReader *In = &_In;
 	unsigned char *newstr;
 	int len;
 	int KwKwK, codesize = 9;	/* start at 9 bits/code */

source/common/platform/win32/i_crash.cpp

@@ -381,16 +381,18 @@ static HANDLE WriteMyMiniDump (void)
 			{
 				MiniDumpThreadData dumpdata = { file, pMiniDumpWriteDump, &exceptor };
 				DWORD id;
-				HANDLE thread = CreateThread (NULL, 0, WriteMiniDumpInAnotherThread,
-					&dumpdata, 0, &id);
-				WaitForSingleObject (thread, INFINITE);
-				if (GetExitCodeThread (thread, &id))
+				HANDLE thread = CreateThread (NULL, 0, WriteMiniDumpInAnotherThread, &dumpdata, 0, &id);
+				if (thread != nullptr)
+				{
+					WaitForSingleObject(thread, INFINITE);
+					if (GetExitCodeThread(thread, &id))
 					{
 						good = id;
 					}
 				}
 			}
 		}
+	}
 	else
 	{
 		NeedDbgHelp = true;

source/common/platform/win32/i_dijoy.cpp

@@ -421,7 +421,8 @@ void FDInputJoystick::ProcessInput()
 		return;
 	}
 
-	state = (uint8_t *)alloca(DataFormat.dwDataSize);
+	TArray<uint8_t> statearr(DataFormat.dwDataSize, true);
+	state = statearr.data();
 	hr = Device->GetDeviceState(DataFormat.dwDataSize, state);
 	if (FAILED(hr))
 		return;

source/common/platform/win32/i_input.cpp

@@ -334,7 +334,8 @@ LRESULT CALLBACK WndProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 		if (!GetRawInputData((HRAWINPUT)lParam, RID_INPUT, NULL, &size, sizeof(RAWINPUTHEADER)) &&
 			size != 0)
 		{
-			uint8_t *buffer = (uint8_t *)alloca(size);
+			TArray<uint8_t> array(size, true);
+			uint8_t *buffer = array.data();
 			if (GetRawInputData((HRAWINPUT)lParam, RID_INPUT, buffer, &size, sizeof(RAWINPUTHEADER)) == size)
 			{
 				int code = GET_RAWINPUT_CODE_WPARAM(wParam);
@@ -691,12 +692,15 @@ void I_PutInClipboard (const char *str)
 
 	auto wstr = WideString(str);
 	HGLOBAL cliphandle = GlobalAlloc (GMEM_DDESHARE, wstr.length() * 2 + 2);
-	if (cliphandle != NULL)
+	if (cliphandle != nullptr)
 	{
 		wchar_t *ptr = (wchar_t *)GlobalLock (cliphandle);
-		wcscpy (ptr, wstr.c_str());
-		GlobalUnlock (cliphandle);
-		SetClipboardData (CF_UNICODETEXT, cliphandle);
+		if (ptr)
+		{
+			wcscpy(ptr, wstr.c_str());
+			GlobalUnlock(cliphandle);
+			SetClipboardData(CF_UNICODETEXT, cliphandle);
+		}
 	}
 	CloseClipboard ();
 }

source/common/platform/win32/i_main.cpp

@@ -284,12 +284,12 @@ int DoMain (HINSTANCE hInstance)
 				HANDLE stdinput = GetStdHandle(STD_INPUT_HANDLE);
 
 				ShowWindow(mainwindow.GetHandle(), SW_HIDE);
-				WriteFile(StdOut, "Press any key to exit...", 24, &bytes, NULL);
+				if (StdOut != nullptr) WriteFile(StdOut, "Press any key to exit...", 24, &bytes, nullptr);
 				FlushConsoleInputBuffer(stdinput);
 				SetConsoleMode(stdinput, 0);
 				ReadConsole(stdinput, &bytes, 1, &bytes, NULL);
 			}
-			else if (StdOut == NULL)
+			else if (StdOut == nullptr)
 			{
 				mainwindow.ShowErrorPane(nullptr);
 			}

source/common/rendering/gl_load/gl_load.c

@@ -77,11 +77,20 @@ static void CheckOpenGL(void)
     if (opengl32dll == 0)
     {
         opengl32dll = LoadLibrary(L"OpenGL32.DLL");
+		if (opengl32dll != 0)
+		{
 			createcontext = (HGLRC(WINAPI*)(HDC)) GetProcAddress(opengl32dll, "wglCreateContext");
 			deletecontext = (BOOL(WINAPI*)(HGLRC)) GetProcAddress(opengl32dll, "wglDeleteContext");
 			makecurrent = (BOOL(WINAPI*)(HDC, HGLRC)) GetProcAddress(opengl32dll, "wglMakeCurrent");
 			getprocaddress = (PROC(WINAPI*)(LPCSTR)) GetProcAddress(opengl32dll, "wglGetProcAddress");
 		}
+		else
+		{
+			// Should this ever happen we have no choice but to hard abort, there is no good way to recover.
+			MessageBoxA(0, "OpenGL32.dll not found", "Fatal error", MB_OK | MB_ICONERROR | MB_TASKMODAL);
+			exit(3);
+		}
+    }
 }
 
 HGLRC zd_wglCreateContext(HDC dc)

source/common/textures/hires/hqresize.cpp

@@ -39,6 +39,7 @@
 #ifdef HAVE_MMX
 #include "hqnx_asm/hqnx_asm.h"
 #endif
+#include <memory>
 #include "xbr/xbrz.h"
 #include "xbr/xbrz_old.h"
 #include "parallel_for.h"
@@ -304,7 +305,8 @@ static unsigned char *hqNxAsmHelper( void (*hqNxFunction) ( int*, unsigned char*
 		initdone = true;
 	}
 
-	HQnX_asm::CImage cImageIn;
+	auto pImageIn = std::make_unique<HQnX_asm::CImage>();
+	auto& cImageIn = *pImageIn;
 	cImageIn.SetImage(inputBuffer, inWidth, inHeight, 32);
 	cImageIn.Convert32To17();
 

source/common/textures/m_png.cpp

@@ -510,7 +510,8 @@ bool M_ReadIDAT (FileReader &file, uint8_t *buffer, int width, int height, int p
 	{
 		i += bytesPerRowOut * 2;
 	}
-	inputLine = (Byte *)alloca (i);
+	TArray<Byte> inputArray(i, true);
+	inputLine = inputArray.data();
 	adam7buff[0] = inputLine + 4 + bytesPerRowOut;
 	adam7buff[1] = adam7buff[0] + bytesPerRowOut;
 	adam7buff[2] = adam7buff[1] + bytesPerRowOut;
@@ -925,7 +926,8 @@ bool M_SaveBitmap(const uint8_t *from, ESSType color_type, int width, int height
 		temprow[i] = &temprow_storage[temprow_size * i];
 	}
 
-	Byte buffer[PNG_WRITE_SIZE];
+	TArray<Byte> array(PNG_WRITE_SIZE, true);
+	auto buffer = array.data();
 	z_stream stream;
 	int err;
 	int y;

source/common/thirdparty/gain_analysis.cpp

@@ -282,7 +282,7 @@ GainAnalyzer::ResetSampleFrequency(int samplefreq) {
 
 int
 GainAnalyzer::InitGainAnalysis(int samplefreq) {
-    *this = {};
+    memset(this, 0, sizeof(*this));
     if (ResetSampleFrequency(samplefreq) != INIT_GAIN_ANALYSIS_OK) {
         return INIT_GAIN_ANALYSIS_ERROR;
     }