Expose default callback functions.

This was suggested in #33.

MemoryModule.c

@@ -423,7 +423,7 @@ BuildImportTable(PMEMORYMODULE module)
     return result;
 }
 
-static HCUSTOMMODULE _LoadLibrary(LPCSTR filename, void *userdata)
+HCUSTOMMODULE MemoryDefaultLoadLibrary(LPCSTR filename, void *userdata)
 {
     HMODULE result;
     UNREFERENCED_PARAMETER(userdata);
@@ -435,21 +435,21 @@ static HCUSTOMMODULE _LoadLibrary(LPCSTR filename, void *userdata)
     return (HCUSTOMMODULE) result;
 }
 
-static FARPROC _GetProcAddress(HCUSTOMMODULE module, LPCSTR name, void *userdata)
+FARPROC MemoryDefaultGetProcAddress(HCUSTOMMODULE module, LPCSTR name, void *userdata)
 {
     UNREFERENCED_PARAMETER(userdata);
     return (FARPROC) GetProcAddress((HMODULE) module, name);
 }
 
-static void _FreeLibrary(HCUSTOMMODULE module, void *userdata)
+void MemoryDefaultFreeLibrary(HCUSTOMMODULE module, void *userdata)
 {
     UNREFERENCED_PARAMETER(userdata);
     FreeLibrary((HMODULE) module);
 }
 
 HMEMORYMODULE MemoryLoadLibrary(const void *data, size_t size)
 {
-    return MemoryLoadLibraryEx(data, size, _LoadLibrary, _GetProcAddress, _FreeLibrary, NULL);
+    return MemoryLoadLibraryEx(data, size, MemoryDefaultLoadLibrary, MemoryDefaultGetProcAddress, MemoryDefaultFreeLibrary, NULL);
 }
 
 HMEMORYMODULE MemoryLoadLibraryEx(const void *data, size_t size,

MemoryModule.h

@@ -117,6 +117,30 @@ int MemoryLoadString(HMEMORYMODULE, UINT, LPTSTR, int);
  */
 int MemoryLoadStringEx(HMEMORYMODULE, UINT, LPTSTR, int, WORD);
 
+/**
+ * Default implementation of CustomLoadLibraryFunc that calls LoadLibraryA
+ * internally to load an additional libary.
+ *
+ * This is the default as used by MemoryLoadLibrary.
+ */
+HCUSTOMMODULE MemoryDefaultLoadLibrary(LPCSTR, void *);
+
+/**
+ * Default implementation of CustomGetProcAddressFunc that calls GetProcAddress
+ * internally to get the address of an exported function.
+ *
+ * This is the default as used by MemoryLoadLibrary.
+ */
+FARPROC MemoryDefaultGetProcAddress(HCUSTOMMODULE, LPCSTR, void *);
+
+/**
+ * Default implementation of CustomFreeLibraryFunc that calls FreeLibrary
+ * internally to release an additional libary.
+ *
+ * This is the default as used by MemoryLoadLibrary.
+ */
+void MemoryDefaultFreeLibrary(HCUSTOMMODULE, void *);
+
 #ifdef __cplusplus
 }
 #endif