Function FillBufferWithTimeout

Sources/nCine/Application.cpp:186–227

template<typename TCallback>
static bool FillBufferWithTimeout(HANDLE handle, OVERLAPPED& ov, char* buffer, std::uint32_t bufferSize, TCallback callback)
{
	constexpr std::uint64_t TimeoutMs = 100;

	std::uint32_t bytesRead = 0;
	std::uint64_t startTime = ::GetTickCount64();
	std::uint64_t now = startTime;

	while (true) {
		if (!::ReadFile(handle, buffer + bytesRead, bufferSize - bytesRead, NULL, &ov)) {
			DWORD err = GetLastError();
			if (err == ERROR_IO_PENDING) {
				DWORD waitResult = ::WaitForSingleObject(ov.hEvent, (DWORD)(TimeoutMs - (now - startTime)));
				if (waitResult == WAIT_TIMEOUT) {
					::CancelIo(handle);
					break;
				} else if (waitResult != WAIT_OBJECT_0) {
					break;
				}
			} else {
				break;
			}
		}

		DWORD partialBytesRead = 0;
		if (!::GetOverlappedResult(handle, &ov, &partialBytesRead, FALSE)) {
			break;
		}

		bytesRead += partialBytesRead;
		if (callback(StringView(buffer, bytesRead))) {
			return true;
		}

		now = ::GetTickCount64();
		if (now - startTime >= TimeoutMs || bytesRead >= bufferSize) {
			break;
		}
	}

	return false;
}

static void CheckConsoleCapabilities()
{