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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Linq;
using System.Reflection;
using System.Security.Cryptography;
using System.Text;
namespace WinRT
{
internal static class GuidGenerator
{
public static Guid GetGUID(Type type)
{
return type.GetGuidType().GUID;
}
public static Guid GetIID(Type type)
{
type = type.GetGuidType();
if (!type.IsGenericType)
{
return type.GUID;
}
return (Guid)type.GetField("PIID").GetValue(null);
}
public static string GetSignature(Type type)
{
var helperType = type.FindHelperType();
if (helperType != null)
{
var sigMethod = helperType.GetMethod("GetGuidSignature", BindingFlags.Static | BindingFlags.Public);
if (sigMethod != null)
{
return (string)sigMethod.Invoke(null, new Type[] { });
}
}
if (type == typeof(object))
{
return "cinterface(IInspectable)";
}
if (type.IsGenericType)
{
var args = type.GetGenericArguments().Select(t => GetSignature(t));
return $"pinterface({{{GetGUID(type)}}};{String.Join(";", args)})";
}
if (type.IsValueType)
{
switch (type.Name)
{
case "SByte": return "i1";
case "Byte": return "u1";
case "Int16": return "i2";
case "UInt16": return "u2";
case "Int32": return "i4";
case "UInt32": return "u4";
case "Int64": return "i8";
case "UInt64": return "u8";
case "Single": return "f4";
case "Double": return "f8";
case "Boolean": return "b1";
case "Char": return "c2";
case "Guid": return "g16";
default:
{
if (type.IsEnum)
{
var isFlags = type.CustomAttributes.Any(cad => cad.AttributeType == typeof(FlagsAttribute));
return $"enum({TypeExtensions.RemoveNamespacePrefix(type.FullName)};{(isFlags ? "u4" : "i4")})";
}
if (!type.IsPrimitive)
{
var args = type.GetFields(BindingFlags.Instance | BindingFlags.Public).Select(fi => GetSignature(fi.FieldType));
return $"struct({TypeExtensions.RemoveNamespacePrefix(type.FullName)};{String.Join(";", args)})";
}
throw new InvalidOperationException("unsupported value type");
}
}
}
if (type == typeof(string))
{
return "string";
}
if (Projections.TryGetDefaultInterfaceTypeForRuntimeClassType(type, out Type iface))
{
return $"rc({TypeExtensions.RemoveNamespacePrefix(type.FullName)};{GetSignature(iface)})";
}
if (type.IsDelegate())
{
return $"delegate({{{GetGUID(type)}}})";
}
return $"{{{type.GUID}}}";
}
private static Guid encode_guid(byte[] data)
{
if (BitConverter.IsLittleEndian)
{
// swap bytes of int a
byte t = data[0];
data[0] = data[3];
data[3] = t;
t = data[1];
data[1] = data[2];
data[2] = t;
// swap bytes of short b
t = data[4];
data[4] = data[5];
data[5] = t;
// swap bytes of short c and encode rfc time/version field
t = data[6];
data[6] = data[7];
data[7] = (byte)((t & 0x0f) | (5 << 4));
// encode rfc clock/reserved field
data[8] = (byte)((data[8] & 0x3f) | 0x80);
}
return new Guid(data.Take(16).ToArray());
}
private static Guid wrt_pinterface_namespace = new Guid("d57af411-737b-c042-abae-878b1e16adee");
public static Guid CreateIID(Type type)
{
var sig = GetSignature(type);
if (!type.IsGenericType)
{
return new Guid(sig);
}
var data = wrt_pinterface_namespace.ToByteArray().Concat(UTF8Encoding.UTF8.GetBytes(sig)).ToArray();
return encode_guid(SHA1.HashData(data));
}
}
}
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