Move solution and projects to src

src/Ryujinx.Horizon/Sdk/Account/Uid.cs

@@ -0,0 +1,62 @@
+using System;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Horizon.Sdk.Account
+{
+    [StructLayout(LayoutKind.Sequential)]
+    readonly record struct Uid
+    {
+        public readonly long High;
+        public readonly long Low;
+
+        public bool IsNull => (Low | High) == 0;
+
+        public static Uid Null => new(0, 0);
+
+        public Uid(long low, long high)
+        {
+            Low  = low;
+            High = high;
+        }
+
+        public Uid(byte[] bytes)
+        {
+            High = BitConverter.ToInt64(bytes, 0);
+            Low  = BitConverter.ToInt64(bytes, 8);
+        }
+
+        public Uid(string hex)
+        {
+            if (hex == null || hex.Length != 32 || !hex.All("0123456789abcdefABCDEF".Contains))
+            {
+                throw new ArgumentException("Invalid Hex value!", nameof(hex));
+            }
+
+            Low  = Convert.ToInt64(hex[16..], 16);
+            High = Convert.ToInt64(hex[..16], 16);
+        }
+
+        public void Write(BinaryWriter binaryWriter)
+        {
+            binaryWriter.Write(High);
+            binaryWriter.Write(Low);
+        }
+
+        public override string ToString()
+        {
+            return High.ToString("x16") + Low.ToString("x16");
+        }
+
+        public LibHac.Account.Uid ToLibHacUid()
+        {
+            return new LibHac.Account.Uid((ulong)High, (ulong)Low);
+        }
+
+        public UInt128 ToUInt128()
+        {
+            return new UInt128((ulong)High, (ulong)Low);
+        }
+    }
+}