Better platform separation along with Windows implementation (Linux refactorings still untested)

src/Platform_Windows.cpp

@@ -1,7 +1,8 @@
 #include "Platform.h"
-#include <sstream>
 #include <Windows.h>
 
+const LPCWSTR EFI_GLOBAL_GUID = L"{8BE4DF61-93CA-11D2-AA0D-00E098032B8C}";
+
 void SetPrivilege(HANDLE hToken, LPCWSTR lpszPrivilege, bool bEnablePrivilege)
 {
 	LUID luid;
@@ -44,6 +45,45 @@ void Platform::Initialize()
 	SetPrivilege(hToken, SE_SHUTDOWN_NAME, true);
 }
 
+bool Platform::UEFICheck()
+{
+	FIRMWARE_TYPE firmwareType;
+	if (GetFirmwareType(&firmwareType) == 0) {
+		std::stringstream message;
+		message << "GetFirmwareType failed: " << GetLastError();
+		throw std::runtime_error(message.str());
+	}
+
+	return firmwareType == FirmwareTypeUefi;
+}
+
+std::pair<std::uint8_t*, std::size_t> Platform::UEFIReadVariable(const std::string& name)
+{
+	auto nameUTF16 = boost::locale::conv::utf_to_utf<char16_t, char>(name);
+
+	const std::size_t bufferSize = 2048;
+    std::uint8_t* data = new std::uint8_t[bufferSize];
+	std::size_t size = GetFirmwareEnvironmentVariableW(reinterpret_cast<LPCWSTR>(nameUTF16.c_str()), EFI_GLOBAL_GUID, data, sizeof(std::uint8_t) * bufferSize);
+	if (size == 0) {
+		std::stringstream message;
+		message << "Failed to read UEFI variable \"" << name << "\": " << GetLastError();
+		throw std::runtime_error(message.str());
+	}
+    return std::make_pair(data, size);
+}
+
+void Platform::UEFIWriteVariable(const std::string& name, void* buffer, std::size_t size)
+{
+	auto nameUTF16 = boost::locale::conv::utf_to_utf<char16_t, char>(name);
+
+	bool result = SetFirmwareEnvironmentVariableW(reinterpret_cast<LPCWSTR>(nameUTF16.c_str()), EFI_GLOBAL_GUID, buffer, size);
+	if (!result) {
+		std::stringstream message;
+		message << "Failed to write UEFI variable \"" << name << "\": " << GetLastError();
+		throw std::runtime_error(message.str());
+	}
+}
+
 void Platform::Reboot()
 {
 	if (InitiateSystemShutdown(nullptr, nullptr, 0, false, true) == 0) {