Source codes

1 files changed, 103 insertions, 0 deletions

diff --git a/ComLightLib/utils/guid_parse.hpp b/ComLightLib/utils/guid_parse.hpp
new file mode 100644
index 0000000..435fcb3
--- /dev/null
+++ b/ComLightLib/utils/guid_parse.hpp
@@ -0,0 +1,103 @@
+// https://github.com/tobias-loew/constexpr-GUID-cpp-11
+
+//-------------------------------------------------------------------------------------------------------
+// constexpr GUID parsing
+// Written by Alexander Bessonov
+// Written by Tobias Loew
+//
+// Licensed under the MIT license.
+//-------------------------------------------------------------------------------------------------------
+
+#pragma once
+#include <stdexcept>
+#include <string>
+#include <cassert>
+#include <cstdint>
+
+#if !defined(GUID_DEFINED)
+#define GUID_DEFINED
+struct GUID {
+	uint32_t Data1;
+	uint16_t Data2;
+	uint16_t Data3;
+	uint8_t Data4[ 8 ];
+};
+#endif
+
+namespace ComLight
+{
+	namespace details
+	{
+		constexpr const size_t short_guid_form_length = 36;	// XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
+		constexpr const size_t long_guid_form_length = 38;	// {XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}
+
+		constexpr uint8_t parse_hex_digit( const char c )
+		{
+			using namespace std::string_literals;
+			return
+				( '0' <= c && c <= '9' )
+				? c - '0'
+				: ( 'a' <= c && c <= 'f' )
+				? 10 + c - 'a'
+				: ( 'A' <= c && c <= 'F' )
+				? 10 + c - 'A'
+				:
+				throw std::domain_error{ "invalid character in GUID"s };
+		}
+
+		constexpr uint8_t parse_hex_uint8_t( const char *ptr )
+		{
+			return ( parse_hex_digit( ptr[ 0 ] ) << 4 ) + parse_hex_digit( ptr[ 1 ] );
+		}
+
+		constexpr uint16_t parse_hex_uint16_t( const char *ptr )
+		{
+			return ( parse_hex_uint8_t( ptr ) << 8 ) + parse_hex_uint8_t( ptr + 2 );
+		}
+
+		constexpr uint32_t parse_hex_uint32_t( const char *ptr )
+		{
+			return ( parse_hex_uint16_t( ptr ) << 16 ) + parse_hex_uint16_t( ptr + 4 );
+		}
+
+		constexpr GUID parse_guid( const char *begin )
+		{
+			return GUID{
+				parse_hex_uint32_t( begin ),
+				parse_hex_uint16_t( begin + 8 + 1 ),
+				parse_hex_uint16_t( begin + 8 + 1 + 4 + 1 ),
+				{
+					parse_hex_uint8_t( begin + 8 + 1 + 4 + 1 + 4 + 1 ),
+					parse_hex_uint8_t( begin + 8 + 1 + 4 + 1 + 4 + 1 + 2 ),
+					parse_hex_uint8_t( begin + 8 + 1 + 4 + 1 + 4 + 1 + 2 + 2 + 1 ),
+					parse_hex_uint8_t( begin + 8 + 1 + 4 + 1 + 4 + 1 + 2 + 2 + 1 + 2 ),
+					parse_hex_uint8_t( begin + 8 + 1 + 4 + 1 + 4 + 1 + 2 + 2 + 1 + 2 + 2 ),
+					parse_hex_uint8_t( begin + 8 + 1 + 4 + 1 + 4 + 1 + 2 + 2 + 1 + 2 + 2 + 2 ),
+					parse_hex_uint8_t( begin + 8 + 1 + 4 + 1 + 4 + 1 + 2 + 2 + 1 + 2 + 2 + 2 + 2 ),
+					parse_hex_uint8_t( begin + 8 + 1 + 4 + 1 + 4 + 1 + 2 + 2 + 1 + 2 + 2 + 2 + 2 + 2 )
+				}
+			};
+		}
+
+		constexpr GUID make_guid_helper( const char *str, size_t N )
+		{
+			using namespace std::string_literals;
+			using namespace details;
+
+			return ( !( N == long_guid_form_length || N == short_guid_form_length ) )
+				? throw std::domain_error{ "String GUID of the form {XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX} or XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX is expected"s }
+				: ( N == long_guid_form_length && ( str[ 0 ] != '{' || str[ long_guid_form_length - 1 ] != '}' ) )
+				? throw std::domain_error{ "Missing opening or closing brace"s }
+
+			: parse_guid( str + ( N == long_guid_form_length ? 1 : 0 ) );
+		}
+
+
+		template<size_t N>
+		constexpr GUID make_guid( const char( &str )[ N ] )
+		{
+			return make_guid_helper( str, N - 1 );
+		}
+	}
+	using details::make_guid;
+}
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