Bootstrap MxSmack (#343)

* Bootstrap MxSmack

* Add comment about incorrect structure

* Fix naming

* Fix name

* Add a comment about SDK

* Add names from Smacker SDK

* Use SMACK.LIB and interface

* Use RAD.H defined types

* Use different commets

* Fix member offset

* Update mxsmack.cpp

LEGO1/mxsmack.h

@@ -0,0 +1,45 @@
+#ifndef MXSMACK_H
+#define MXSMACK_H
+
+#include "decomp.h"
+#include "mxtypes.h"
+
+#include <smack.h>
+
+// These functions are not part of the public interface,
+// but present in SMACK.LIB and used directly by Mindscape.
+extern "C"
+{
+	// (SMACK.LIB) FUNCTION: LEGO1 0x100cd782
+	u32 SmackGetSizeTables();
+
+	// (SMACK.LIB) FUNCTION: LEGO1 0x100cd7e8
+	void SmackDoTables(
+		u8* p_huffmanTrees,
+		u8* p_huffmanTables,
+		u32 p_codeSize,
+		u32 p_abSize,
+		u32 p_detailSize,
+		u32 p_typeSize
+	);
+
+	// (SMACK.LIB) FUNCTION: LEGO1 0x100d052c
+	u32 SmackGetSizeDeltas(u32 p_width, u32 p_height);
+}
+
+// SIZE 0x6b8
+struct MxSmack {
+	SmackTag m_smackTag;       // 0x00
+	undefined m_unk0x390[784]; // 0x390
+	MxU32* m_frameSizes;       // 0x6a0
+	MxU8* m_frameTypes;        // 0x6a4
+	MxU8* m_huffmanTrees;      // 0x6a8
+	MxU8* m_huffmanTables;     // 0x6ac
+	MxU32 m_maxFrameSize;      // 0x6b0
+	MxU8* m_unk0x6b4;          // 0x6b4
+
+	static MxResult LoadHeaderAndTrees(MxU8* p_data, MxSmack* p_mxSmack);
+	static void Destroy(MxSmack* p_mxSmack);
+};
+
+#endif // MXSMACK_H