MxStream provider and controller vtables (#191)

* MxStreamProvider and MxRamStreamProvider vtable

* Update mxramstreamprovider.h

* Match IsA

* Fixes, improvements

---------

Co-authored-by: Christian Semmler <mail@csemmler.com>

LEGO1/mxramstreamprovider.cpp

@@ -0,0 +1,59 @@
+#include "mxramstreamprovider.h"
+#include "decomp.h"
+
+DECOMP_SIZE_ASSERT(MxRAMStreamProvider, 0x24);
+
+// OFFSET: LEGO1 0x100d0730
+MxRAMStreamProvider::MxRAMStreamProvider()
+{
+  m_bufferSize = 0;
+  m_fileSize = 0;
+  m_pBufferOfFileSize = NULL;
+  m_lengthInDWords = 0;
+  m_bufferForDWords = NULL;
+}
+
+// OFFSET: LEGO1 0x100d0a50
+MxRAMStreamProvider::~MxRAMStreamProvider()
+{
+  m_bufferSize = 0;
+  m_fileSize = 0;
+
+  free(m_pBufferOfFileSize);
+  m_pBufferOfFileSize = NULL;
+
+  m_lengthInDWords = 0;
+
+  free(m_bufferForDWords);
+  m_bufferForDWords = NULL;
+}
+
+// OFFSET: LEGO1 0x100d0ae0 STUB
+MxResult MxRAMStreamProvider::SetResourceToGet(void* p_resource)
+{
+  return FAILURE;
+}
+
+// OFFSET: LEGO1 0x100d0930
+MxU32 MxRAMStreamProvider::GetFileSize()
+{
+  return m_fileSize;
+}
+
+// OFFSET: LEGO1 0x100d0940
+MxU32 MxRAMStreamProvider::vtable0x1C()
+{
+  return 1;
+}
+
+// OFFSET: LEGO1 0x100d0950
+MxU32 MxRAMStreamProvider::GetLengthInDWords()
+{
+  return m_lengthInDWords;
+}
+
+// OFFSET: LEGO1 0x100d0960
+void* MxRAMStreamProvider::GetBufferForDWords()
+{
+  return m_bufferForDWords;
+}