cusp/GuidUtils.h at master · aeulitz/cusp · GitHub

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#pragma once

#include <guiddef.h>
#include "CppUnitTest.h"

#include <string>

template<>
struct std::hash<GUID>
{
	size_t operator()(GUID guid) const
	{
		// typedef struct _GUID {
		// 	unsigned long  Data1;
		// 	unsigned short Data2;
		// 	unsigned short Data3;
		// 	unsigned char  Data4[8];
		// } GUID;

		return
			guid.Data1 ^
			((guid.Data2 << 16) | guid.Data3) ^
			*reinterpret_cast<uint32_t*>(guid.Data4) ^
			*reinterpret_cast<uint32_t*>(guid.Data4 + 4);
	}
};

namespace
{
	// helper array to convert a hexadecimal ASCII character into an unsigned char value
	constexpr const unsigned char H2U[256] = {
		// 16 rows x 16 cols
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0, 0, 0, 0, 0,
		0, 10, 11, 12, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0,
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
		0, 10, 11, 12, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0,
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	};

	inline wchar_t ToHexDigit(uint8_t nibble)
	{
		return nibble < 10 ? L'0' + nibble : L'a' + (nibble - 10);
	}
}

namespace Guid
{
	/// To represent a GUID string without curly braces: "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXX"
	typedef char GuidString[37];

	/// Converts string to a GUID at compile time. Expected format: "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXX"
	constexpr GUID StringToGuid(const GuidString& g) noexcept
	{
		return
		{
			static_cast<unsigned long>((H2U[g[0]] << 28) | (H2U[g[1]] << 24) | (H2U[g[2]] << 20) | (H2U[g[3]] << 16) | (H2U[g[4]] << 12) | (H2U[g[5]] << 8) | (H2U[g[6]] << 4) | H2U[g[7]]),
			static_cast<unsigned short>((H2U[g[9]] << 12) | (H2U[g[10]] << 8) | (H2U[g[11]] << 4) | H2U[g[12]]),
			static_cast<unsigned short>((H2U[g[14]] << 12) | (H2U[g[15]] << 8) | (H2U[g[16]] << 4) | H2U[g[17]]),
			{
				static_cast<unsigned char>((H2U[g[19]] << 4) | H2U[g[20]]),
				static_cast<unsigned char>((H2U[g[21]] << 4) | H2U[g[22]]),
				static_cast<unsigned char>((H2U[g[24]] << 4) | H2U[g[25]]),
				static_cast<unsigned char>((H2U[g[26]] << 4) | H2U[g[27]]),
				static_cast<unsigned char>((H2U[g[28]] << 4) | H2U[g[29]]),
				static_cast<unsigned char>((H2U[g[30]] << 4) | H2U[g[31]]),
				static_cast<unsigned char>((H2U[g[32]] << 4) | H2U[g[33]]),
				static_cast<unsigned char>((H2U[g[34]] << 4) | H2U[g[35]])
			}
		};
	}
}

namespace Microsoft::VisualStudio::CppUnitTestFramework
{
	// needed by the CppUnitTestFramework for the proper display of error messages
	template<> inline std::wstring ToString<GUID>(const GUID& g)
	{
		std::wstring s;
		return s
			.append(1, ToHexDigit((g.Data1 >> (7 * 4)) & 0x0F))
			.append(1, ToHexDigit((g.Data1 >> (6 * 4)) & 0x0F))
			.append(1, ToHexDigit((g.Data1 >> (5 * 4)) & 0x0F))
			.append(1, ToHexDigit((g.Data1 >> (4 * 4)) & 0x0F))
			.append(1, ToHexDigit((g.Data1 >> (3 * 4)) & 0x0F))
			.append(1, ToHexDigit((g.Data1 >> (2 * 4)) & 0x0F))
			.append(1, ToHexDigit((g.Data1 >> (1 * 4)) & 0x0F))
			.append(1, ToHexDigit((g.Data1 >> (0 * 4)) & 0x0F))
			.append(1, L'-')
			.append(1, ToHexDigit((g.Data2 >> (3 * 4)) & 0x0F))
			.append(1, ToHexDigit((g.Data2 >> (2 * 4)) & 0x0F))
			.append(1, ToHexDigit((g.Data2 >> (1 * 4)) & 0x0F))
			.append(1, ToHexDigit((g.Data2 >> (0 * 4)) & 0x0F))
			.append(1, L'-')
			.append(1, ToHexDigit((g.Data3 >> (3 * 4)) & 0x0F))
			.append(1, ToHexDigit((g.Data3 >> (2 * 4)) & 0x0F))
			.append(1, ToHexDigit((g.Data3 >> (1 * 4)) & 0x0F))
			.append(1, ToHexDigit((g.Data3 >> (0 * 4)) & 0x0F))
			.append(1, L'-')
			.append(1, ToHexDigit((g.Data4[0] >> 4) & 0x0F))
			.append(1, ToHexDigit((g.Data4[0] >> 0) & 0x0F))
			.append(1, ToHexDigit((g.Data4[1] >> 4) & 0x0F))
			.append(1, ToHexDigit((g.Data4[1] >> 0) & 0x0F))
			.append(1, L'-')
			.append(1, ToHexDigit((g.Data4[2] >> 4) & 0x0F))
			.append(1, ToHexDigit((g.Data4[2] >> 0) & 0x0F))
			.append(1, ToHexDigit((g.Data4[3] >> 4) & 0x0F))
			.append(1, ToHexDigit((g.Data4[3] >> 0) & 0x0F))
			.append(1, ToHexDigit((g.Data4[4] >> 4) & 0x0F))
			.append(1, ToHexDigit((g.Data4[4] >> 0) & 0x0F))
			.append(1, ToHexDigit((g.Data4[5] >> 4) & 0x0F))
			.append(1, ToHexDigit((g.Data4[5] >> 0) & 0x0F))
			.append(1, ToHexDigit((g.Data4[6] >> 4) & 0x0F))
			.append(1, ToHexDigit((g.Data4[6] >> 0) & 0x0F))
			.append(1, ToHexDigit((g.Data4[7] >> 4) & 0x0F))
			.append(1, ToHexDigit((g.Data4[7] >> 0) & 0x0F));
	}
}