diff --git a/BurnOutSharp/External/libmspack/OAB/Compressor.cs b/BurnOutSharp/External/libmspack/OAB/Compressor.cs
index 3d7a80a4..c1c7abcb 100644
--- a/BurnOutSharp/External/libmspack/OAB/Compressor.cs
+++ b/BurnOutSharp/External/libmspack/OAB/Compressor.cs
@@ -39,20 +39,16 @@ namespace LibMSPackSharp.OAB
         /// The input file will be read and the compressed contents written to the
         /// output file.
         /// </summary>
-        /// <param name="self">
-        /// a self-referential pointer to the msoab_decompressor
-        /// instance being called
-        /// </param>
         /// <param name="input">
-        /// the filename of the input file. This is passed
+        /// The filename of the input file. This is passed
         /// directly to mspack_system::open().
         /// </param>
         /// <param name="output">
-        /// the filename of the output file. This is passed
+        /// The filename of the output file. This is passed
         /// directly to mspack_system::open().
         /// </param>
-        /// <returns>an error code, or MSPACK_ERR_OK if successful</returns>
-        public Func<Compressor, string, string, Error> Compress;
+        /// <returns>An error code, or MSPACK_ERR_OK if successful</returns>
+        public Error Compress(string input, string output) => throw new NotImplementedException();
 
         /// <summary>
         /// Generate a compressed incremental OAB patch file.
@@ -61,26 +57,22 @@ namespace LibMSPackSharp.OAB
         /// incremental patch to generate "input" from "base" will be written to
         /// the output file.
         /// </summary>
-        /// <param name="self">
-        /// a self-referential pointer to the msoab_decompressor
-        /// instance being called
-        /// </param>
         /// <param name="input">
-        /// the filename of the input file containing the new
+        /// The filename of the input file containing the new
         /// version of its contents. This is passed directly
         /// to mspack_system::open().
         /// </param>
-        /// <param name="base">
-        /// the filename of the original base file containing
+        /// <param name="baseFile">
+        /// The filename of the original base file containing
         /// the old version of its contents, against which the
         /// incremental patch shall generated. This is passed
         /// directly to mspack_system::open().
         /// </param>
         /// <param name="output">
-        /// the filename of the output file. This is passed
+        /// The filename of the output file. This is passed
         /// directly to mspack_system::open().
         /// </param>
-        /// <returns>an error code, or MSPACK_ERR_OK if successful</returns>
-        public Func<Compressor, string, string, string, Error> CompressIncremental;
+        /// <returns>An error code, or MSPACK_ERR_OK if successful</returns>
+        public Error CompressIncremental(string input, string baseFile, string output) => throw new NotImplementedException();
     }
 }
diff --git a/BurnOutSharp/External/libmspack/OAB/Decompressor.cs b/BurnOutSharp/External/libmspack/OAB/Decompressor.cs
index cde2dd4d..94db15b5 100644
--- a/BurnOutSharp/External/libmspack/OAB/Decompressor.cs
+++ b/BurnOutSharp/External/libmspack/OAB/Decompressor.cs
@@ -474,21 +474,24 @@ namespace LibMSPackSharp.OAB
 
         #region Helpers
 
-        private Error CopyFileHandle(FileStream infh, FileStream outfh, int bytes_to_copy, byte[] buf, int buf_size)
+        /// <summary>
+        /// Copy between the input and output, if possible
+        /// </summary>
+        private Error CopyFileHandle(FileStream input, FileStream output, int bytesToCopy, byte[] buf, int bufferSize)
         {
-            while (bytes_to_copy != 0)
+            while (bytesToCopy != 0)
             {
-                int run = buf_size;
-                if (run > bytes_to_copy)
-                    run = bytes_to_copy;
+                int run = bufferSize;
+                if (run > bytesToCopy)
+                    run = bytesToCopy;
 
-                if (System.Read(infh, buf, 0, run) != run)
+                if (System.Read(input, buf, 0, run) != run)
                     return Error.MSPACK_ERR_READ;
 
-                if (outfh != null && System.Write(outfh, buf, 0, run) != run)
+                if (output != null && System.Write(output, buf, 0, run) != run)
                     return Error.MSPACK_ERR_WRITE;
 
-                bytes_to_copy -= run;
+                bytesToCopy -= run;
             }
 
             return Error.MSPACK_ERR_OK;