I have nothing to gatekeep, i have nothing special...

AssetStudio/OodleHelper.cs

@@ -0,0 +1,25 @@
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+
+namespace AssetStudio;
+public static class OodleHelper
+{
+    [DllImport(@"oo2core_9_win64.dll")]
+    static extern int OodleLZ_Decompress(ref byte compressedBuffer, int compressedBufferSize, ref byte decompressedBuffer, int decompressedBufferSize, int fuzzSafe, int checkCRC, int verbosity, IntPtr rawBuffer, int rawBufferSize, IntPtr fpCallback, IntPtr callbackUserData, IntPtr decoderMemory, IntPtr decoderMemorySize, int threadPhase);
+
+    public static int Decompress(Span<byte> compressed, Span<byte> decompressed)
+    {
+        int numWrite = -1;
+        try
+        {
+            numWrite = OodleLZ_Decompress(ref compressed[0], compressed.Length, ref decompressed[0], decompressed.Length, 1, 0, 0, 0, 0, 0, 0, 0, 0, 3);
+        }
+        catch (Exception)
+        {
+            throw new IOException($"Oodle decompression error, write {numWrite} bytes but expected {decompressed.Length} bytes");
+        }
+
+        return numWrite;
+    }
+}