1 files changed, 37 insertions, 0 deletions
diff --git a/Ryujinx.HLE/Utilities/FontUtils.cs b/Ryujinx.HLE/Utilities/FontUtils.cs
new file mode 100644
index 00000000..efe7560c
--- /dev/null
+++ b/Ryujinx.HLE/Utilities/FontUtils.cs
@@ -0,0 +1,37 @@
+using System.IO;
+
+namespace Ryujinx.HLE.Utilities
+{
+    public static class FontUtils
+    {
+        private static readonly uint FontKey = 0x06186249;
+
+        public static byte[] DecryptFont(Stream BFTTFStream)
+        {
+            uint KXor(uint In) => In ^ 0x06186249;
+
+            using (BinaryReader Reader = new BinaryReader(BFTTFStream))
+            {
+                using (MemoryStream TTFStream = new MemoryStream())
+                {
+                    using (BinaryWriter Output = new BinaryWriter(TTFStream))
+                    {
+                        if (KXor(Reader.ReadUInt32()) != 0x18029a7f)
+                        {
+                            throw new InvalidDataException("Error: Input file is not in BFTTF format!");
+                        }
+
+                        BFTTFStream.Position += 4;
+
+                        for (int i = 0; i < (BFTTFStream.Length - 8) / 4; i++)
+                        {
+                            Output.Write(KXor(Reader.ReadUInt32()));
+                        }
+
+                        return TTFStream.ToArray();
+                    }
+                }
+            }
+        }
+    }
+}