1 files changed, 75 insertions, 0 deletions
diff --git a/src/Ryujinx.HLE/HOS/Services/Mii/UtilityImpl.cs b/src/Ryujinx.HLE/HOS/Services/Mii/UtilityImpl.cs
new file mode 100644
index 00000000..30b201f6
--- /dev/null
+++ b/src/Ryujinx.HLE/HOS/Services/Mii/UtilityImpl.cs
@@ -0,0 +1,75 @@
+using Ryujinx.Common.Utilities;
+using Ryujinx.Cpu;
+using Ryujinx.HLE.HOS.Services.Mii.Types;
+using Ryujinx.HLE.HOS.Services.Time;
+using Ryujinx.HLE.HOS.Services.Time.Clock;
+using System;
+
+namespace Ryujinx.HLE.HOS.Services.Mii
+{
+    class UtilityImpl
+    {
+        private uint _x;
+        private uint _y;
+        private uint _z;
+        private uint _w;
+
+        public UtilityImpl(ITickSource tickSource)
+        {
+            _x = 123456789;
+            _y = 362436069;
+
+            TimeSpanType time = TimeManager.Instance.TickBasedSteadyClock.GetCurrentRawTimePoint(tickSource);
+
+            _w = (uint)(time.NanoSeconds & uint.MaxValue);
+            _z = (uint)((time.NanoSeconds >> 32) & uint.MaxValue);
+        }
+
+        private uint GetRandom()
+        {
+            uint t = (_x ^ (_x << 11));
+
+            _x = _y;
+            _y = _z;
+            _z = _w;
+            _w = (_w ^ (_w >> 19)) ^ (t ^ (t >> 8));
+
+            return _w;
+        }
+
+        public int GetRandom(int end)
+        {
+            return (int)GetRandom((uint)end);
+        }
+
+        public uint GetRandom(uint end)
+        {
+            uint random = GetRandom();
+
+            return random - random / end * end;
+        }
+
+        public uint GetRandom(uint start, uint end)
+        {
+            uint random = GetRandom();
+
+            return random - random / (1 - start + end) * (1 - start + end) + start;
+        }
+
+        public int GetRandom(int start, int end)
+        {
+            return (int)GetRandom((uint)start, (uint)end);
+        }
+
+        public CreateId MakeCreateId()
+        {
+            UInt128 value = UInt128Utils.CreateRandom();
+
+            // Ensure the random ID generated is valid as a create id.
+            value &= ~new UInt128(0xC0, 0);
+            value |= new UInt128(0x80, 0);
+
+            return new CreateId(value);
+        }
+    }
+}