diff --git a/macresources/FakeResDecompress.py b/macresources/FakeResDecompress.py
new file mode 100644
index 0000000..3e198ef
--- /dev/null
+++ b/macresources/FakeResDecompress.py
@@ -0,0 +1,17 @@
+def GetEncoding(inf):
+	if not inf.startswith(b'\xA8\x9F\x65\x72'):
+		encoding = 'unknown'
+	elif inf[6] == 8:
+		encoding = 'DonnBits'
+	elif inf[6] == 9:
+		defprocID = int.from_bytes(len[8:10], byteorder='big', signed=True)
+		encoding = 'GreggyBits%d' % defprocID
+	return encoding
+
+
+def DecompressResource(inf):
+	return inf
+
+
+def CompressResource(inf, encoding):
+	return inf
diff --git a/macresources/main.py b/macresources/main.py
index ebc9654..87571b0 100644
--- a/macresources/main.py
+++ b/macresources/main.py
@@ -1,6 +1,7 @@
 import collections
 import struct
 import enum
+from FakeResDecompress import DecompressResource, CompressResource
 
 
 FAKE_HEADER_RSRC_TYPE = b'header' # obviously invalid