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diff --git a/SrcShared/Patches/EmPatchModuleTypes.h b/SrcShared/Patches/EmPatchModuleTypes.h
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+++ b/SrcShared/Patches/EmPatchModuleTypes.h
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+/* -*- mode: C++; tab-width: 4 -*- */
+/* ===================================================================== *\
+	Copyright (c) 2001 PocketPyro, Inc.
+	Portions Copyright (c) Palm, Inc.
+	All rights reserved.
+
+	This file is part of the Palm OS Emulator.
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+\* ===================================================================== */
+
+#ifndef EmPatchModuleTypes_h
+#define EmPatchModuleTypes_h
+
+#include "EmPatchIf.h"			// HeadpatchProc, TailpatchProc, IEmPatchModule
+#include "EmStructs.h"			// SystemCallContext
+
+
+// ======================================================================
+// At compile time, the list of functions we want to head- and tailpatch
+// are stored in an array of ProtoPatchTableEntries.  At runtime, these
+// compact arrays are expanded by PatchModule into a sparse array
+// so that the function dispatch number can be used to look up the
+// patch function.
+// ======================================================================
+
+struct ProtoPatchTableEntry
+{
+	uint16			fTrapWord;
+	HeadpatchProc	fHeadpatch;
+	TailpatchProc	fTailpatch;
+};
+
+
+// ===========================================================================
+//		InstalledLibPatchEntry
+// ===========================================================================
+// Structure used to hold tail-patch information.
+
+class InstalledLibPatchEntry
+{
+	public:
+								InstalledLibPatchEntry (void) :
+									fIsDirty (true),
+									fTableP (NULL)
+								{
+								}
+
+		bool					IsDirty (void) const
+								{
+									return fIsDirty;
+								}
+
+		void					SetDirty (bool dirty = true)
+								{
+									fIsDirty = dirty;
+								}
+
+		IEmPatchModule*			GetPatchTableP (void) const
+								{
+									return fTableP;
+								}
+
+		void					SetPatchTableP (IEmPatchModule* tableP)
+								{
+									fTableP = tableP;
+								}
+
+	private:
+		bool					fIsDirty;
+		IEmPatchModule*			fTableP;
+};
+
+typedef vector<InstalledLibPatchEntry> PatchedLibIndex;
+
+
+// ===========================================================================
+//		Ą TailpatchType
+// ===========================================================================
+// Structure used to hold tail-patch information.
+
+struct TailpatchType
+{
+	SystemCallContext	fContext;
+	int32 				fCount;
+	TailpatchProc		fTailpatch;
+};
+
+typedef vector<TailpatchType>		TailPatchIndex;
+
+#endif // EmPatchModuleTypes_h