ange-ftp-make-compressed-filename-alist

ange-ftp-make-compressed-filename-alist is a variable defined in `ange-ftp.el'.
Its value is

((cms . ange-ftp-cms-make-compressed-filename)
 (vms . ange-ftp-vms-make-compressed-filename))

Documentation:
Alist of host-type-specific functions to process file names for compression.
Each element has the form (TYPE . FUNC).
FUNC should take one argument, a file name, and return a list
of the form (COMPRESSING NEWNAME).
COMPRESSING should be t if the specified file should be compressed,
and nil if it should be uncompressed (that is, if it is a compressed file).
NEWNAME should be the name to give the new compressed or uncompressed file.