Implement PeGetFileSize(), PeGetImageSize() and PeUnloadImage() routines

xtldr/modules/pecoff/includes/pecoff.h

@@ -19,6 +19,16 @@ EFI_STATUS
 PeGetEntryPoint(IN PVOID ImagePointer,
                 OUT PVOID *EntryPoint);
 
+XTCDECL
+EFI_STATUS
+PeGetFileSize(IN PVOID ImagePointer,
+              OUT PULONGLONG FileSize);
+
+XTCDECL
+EFI_STATUS
+PeGetImageSize(IN PVOID ImagePointer,
+               OUT PUINT ImageSize);
+
 XTCDECL
 EFI_STATUS
 PeGetMachineType(IN PVOID ImagePointer,
@@ -52,6 +62,10 @@ EFI_STATUS
 PeRelocateImage(IN PVOID ImagePointer,
                 IN EFI_VIRTUAL_ADDRESS Address);
 
+XTCDECL
+EFI_STATUS
+PeUnloadImage(IN PVOID ImagePointer);
+
 XTCDECL
 EFI_STATUS
 PeVerifyImage(IN PVOID ImagePointer);