SSX3LobbyServer/lib/base/fourcc.hpp

#pragma once
#include <base/fixed_string.hpp>
#include <bit>

namespace base {

	/// Type system magic
	enum class FourCC32_t : u32 {};

	template <FixedString fccString, std::endian Endian = std::endian::little>
	consteval FourCC32_t FourCC32() {
		static_assert(fccString.Length() == 4, "Provided string is not a FourCC");

		switch(Endian) {
			case std::endian::little:
				return static_cast<FourCC32_t>((fccString[0]) | (fccString[1] << 8) | (fccString[2] << 16) | (fccString[3] << 24));

			case std::endian::big:
				return static_cast<FourCC32_t>((fccString[0] << 24) | (fccString[1] << 16) | (fccString[2] << 8) | fccString[3]);

				// endian::native is practically implemented in most standard libraries
				// by aliasing the native endian enumerator, so that it will match
				// one of the two cases here. therefore this code is literally useless
				// and i have no idea why i even wrote it 4 years ago :')
				// default:
				//	throw "Invalid endian provided? How'd you do that?"; // NOLINT
		}
	}

	inline std::string FourCC32ToString(FourCC32_t fcc) {
		auto* fccAsBytes = std::bit_cast<u8*>(&fcc);
		return std::format("{:c}{:c}{:c}{:c}", fccAsBytes[0], fccAsBytes[1], fccAsBytes[2], fccAsBytes[3]);
	}

	// TODO: 64-bit version which returns a u64 (if required?)

} // namespace base