Function DeleteDirectoryInternal

Sources/Shared/IO/FileSystem.cpp:188–944

#if defined(DEATH_TARGET_WINDOWS)
		static bool DeleteDirectoryInternal(ArrayView<wchar_t> path, bool recursive, std::int32_t depth)
		{
			if (recursive) {
				if (path.size() + 3 <= FileSystem::MaxPathLength) {
					if DEATH_UNLIKELY(NtQueryDirectoryFile == nullptr) {
						if (HMODULE hNtdll = ::GetModuleHandle(L"ntdll.dll")) {
							NtQueryDirectoryFile = (_NtQueryDirectoryFile)::GetProcAddress(hNtdll, "NtQueryDirectoryFile");
							DEATH_ASSERT(NtQueryDirectoryFile != nullptr, "NtQueryDirectoryFile() cannot be found", false);
						}
					}

					Array<wchar_t> bufferExtended{NoInit, FileSystem::MaxPathLength};
					std::memcpy(bufferExtended.data(), path.data(), path.size() * sizeof(wchar_t));

					std::size_t bufferOffset = path.size();
					if (bufferExtended[bufferOffset - 1] == L'/' || path[bufferOffset - 1] == L'\\') {
						bufferExtended[bufferOffset - 1] = L'\\';
					} else {
						bufferExtended[bufferOffset] = L'\\';
						bufferOffset++;
					}

					// Remove trailing backslash and open directory
					Array<wchar_t> dirPath{NoInit, bufferOffset};
					std::memcpy(dirPath.data(), bufferExtended.data(), (bufferOffset - 1) * sizeof(wchar_t));
					dirPath[bufferOffset - 1] = L'\0';

#	if defined(DEATH_TARGET_WINDOWS_RT)
					HANDLE hDirectory = ::CreateFileFromAppW(dirPath, FILE_LIST_DIRECTORY, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
						nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
#	else
					HANDLE hDirectory = ::CreateFileW(dirPath, FILE_LIST_DIRECTORY, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
						nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
#	endif

					if (hDirectory != NULL && hDirectory != INVALID_HANDLE_VALUE) {
						constexpr ULONG BufferSize = 64 * 1024;
						std::uint8_t* buffer = new std::uint8_t[BufferSize];

						while (true) {
							IO_STATUS_BLOCK ioStatus;
							NTSTATUS status = NtQueryDirectoryFile(hDirectory, nullptr, nullptr, nullptr, &ioStatus,
								buffer, BufferSize, FileFullDirectoryInformation, FALSE, nullptr, FALSE);

							if (status < 0) {
								break;
							}

							FILE_FULL_DIR_INFORMATION* entry = reinterpret_cast<FILE_FULL_DIR_INFORMATION*>(buffer);

							while (true) {
								ULONG fileNameLengthInChars = entry->FileNameLength / sizeof(wchar_t);

								// Skip "." and ".."
								if (!((fileNameLengthInChars == 1 && entry->FileName[0] == L'.') ||
									  (fileNameLengthInChars == 2 && entry->FileName[0] == L'.' && entry->FileName[1] == L'.'))) {

									std::memcpy(&bufferExtended[bufferOffset], entry->FileName, entry->FileNameLength);