diff --git a/LEGO1/mxdsbuffer.cpp b/LEGO1/mxdsbuffer.cpp
index 76df228d..b01be21a 100644
--- a/LEGO1/mxdsbuffer.cpp
+++ b/LEGO1/mxdsbuffer.cpp
@@ -25,12 +25,13 @@ MxDSBuffer::~MxDSBuffer()
 }
 
 // OFFSET: LEGO1 0x100c6780
-void MxDSBuffer::FUN_100c678(void* p_buffer, MxU32 p_size)
+MxResult MxDSBuffer::FUN_100c6780(void* p_buffer, MxU32 p_size)
 {
   m_pBuffer = p_buffer;
   m_pIntoBuffer = p_buffer;
-  m_mode = 2;
   m_pIntoBuffer2 = p_buffer;
   m_bytesRemaining = p_size;
   m_writeOffset = p_size;
+  m_mode = 2;
+  return SUCCESS;
 }
diff --git a/LEGO1/mxdsbuffer.h b/LEGO1/mxdsbuffer.h
index ed33c57e..a48c4727 100644
--- a/LEGO1/mxdsbuffer.h
+++ b/LEGO1/mxdsbuffer.h
@@ -19,7 +19,7 @@ class MxDSBuffer : public MxCore
     return "MxDSBuffer";
   }
 
-  void FUN_100c678(void* p_buffer, MxU32 p_size);
+  MxResult FUN_100c6780(void* p_buffer, MxU32 p_size);
 
   inline void* GetBuffer() { return m_pBuffer;}
   inline MxU32 GetWriteOffset() { return m_writeOffset;}
@@ -32,7 +32,7 @@ class MxDSBuffer : public MxCore
   undefined4 m_unk18;
   undefined4 m_unk1c;
   undefined2 m_unk20;
-  int m_mode;
+  undefined4 m_mode;
   MxU32 m_writeOffset;
   MxU32 m_bytesRemaining;
   undefined4 m_unk30;
diff --git a/LEGO1/mxdssource.cpp b/LEGO1/mxdssource.cpp
index 556a0d2e..3c725a81 100644
--- a/LEGO1/mxdssource.cpp
+++ b/LEGO1/mxdssource.cpp
@@ -2,9 +2,9 @@
 #include "mxdsbuffer.h"
 
 // OFFSET: LEGO1 0x100bffd0
-void MxDSSource::ReadToBuffer(MxDSBuffer* p_unk)
+void MxDSSource::ReadToBuffer(MxDSBuffer* p_buffer)
 {
-  Read((unsigned char*)p_unk->GetBuffer(), p_unk->GetWriteOffset());
+  Read((unsigned char*)p_buffer->GetBuffer(), p_buffer->GetWriteOffset());
 }
 
 // OFFSET: LEGO1 0x100bfff0
diff --git a/LEGO1/mxdssource.h b/LEGO1/mxdssource.h
index 4ccee64e..9c404ad0 100644
--- a/LEGO1/mxdssource.h
+++ b/LEGO1/mxdssource.h
@@ -2,6 +2,7 @@
 #define MXDSSOURCE_H
 
 #include "mxcore.h"
+
 class MxDSBuffer;
 
 // VTABLE 0x100dc8c8
@@ -10,7 +11,7 @@ class MxDSSource : public MxCore
 public:
   MxDSSource()
     : m_lengthInDWords(0)
-    , m_pBuffer(0)
+    , m_pBuffer(NULL)
     , m_position(-1)
   {}
 
@@ -29,7 +30,7 @@ class MxDSSource : public MxCore
 
   virtual MxLong Open(MxULong) = 0;
   virtual MxLong Close() = 0;
-  virtual void ReadToBuffer(MxDSBuffer* p_unk);
+  virtual void ReadToBuffer(MxDSBuffer* p_buffer);
   virtual MxResult Read(unsigned char *, MxULong) = 0;
   virtual MxLong Seek(MxLong, int) = 0;
   virtual MxULong GetBufferSize() = 0;