Get the original and the associated filename from the remapping.
\param original If non-NULL, will be set to the original filename.
\param transformed If non-NULL, will be set to the filename that the original is associated with.
See Implementation
Get the original and the associated filename from the remapping.
\param original If non-NULL, will be set to the original filename.
\param transformed If non-NULL, will be set to the filename that the original is associated with.