1 files changed, 48 insertions, 0 deletions
diff --git a/src/Ryujinx.HLE/HOS/Services/Mii/Helper.cs b/src/Ryujinx.HLE/HOS/Services/Mii/Helper.cs
new file mode 100644
index 00000000..b02bbfd1
--- /dev/null
+++ b/src/Ryujinx.HLE/HOS/Services/Mii/Helper.cs
@@ -0,0 +1,48 @@
+using Ryujinx.Common.Utilities;
+using System;
+using System.Buffers.Binary;
+
+namespace Ryujinx.HLE.HOS.Services.Mii
+{
+    static class Helper
+    {
+        public static ushort CalculateCrc16(ReadOnlySpan<byte> data, int crc, bool reverseEndianess)
+        {
+            const ushort poly = 0x1021;
+
+            for (int i = 0; i < data.Length; i++)
+            {
+                crc ^= data[i] << 8;
+
+                for (int j = 0; j < 8; j++)
+                {
+                    crc <<= 1;
+
+                    if ((crc & 0x10000) != 0)
+                    {
+                        crc = (crc ^ poly) & 0xFFFF;
+                    }
+                }
+            }
+
+            if (reverseEndianess)
+            {
+                return (ushort)(BinaryPrimitives.ReverseEndianness(crc) >> 16);
+            }
+
+            return (ushort)crc;
+        }
+
+        public static UInt128 GetDeviceId()
+        {
+            // FIXME: call set:sys GetMiiAuthorId
+            return UInt128Utils.FromHex("5279754d69694e780000000000000000"); // RyuMiiNx
+        }
+
+        public static ReadOnlySpan<byte> Ver3FacelineColorTable => new byte[] { 0, 1, 2, 3, 4, 5 };
+        public static ReadOnlySpan<byte> Ver3HairColorTable     => new byte[] { 8, 1, 2, 3, 4, 5, 6, 7 };
+        public static ReadOnlySpan<byte> Ver3EyeColorTable      => new byte[] { 8, 9, 10, 11, 12, 13 };
+        public static ReadOnlySpan<byte> Ver3MouthColorTable    => new byte[] { 19, 20, 21, 22, 23 };
+        public static ReadOnlySpan<byte> Ver3GlassColorTable    => new byte[] { 8, 14, 15, 16, 17, 18, 0 };
+    }
+}