Reading "normal" text files with Wide_Text_IO in GNAT

["Adam Beneschan" <adam@irvine.com>]

I was looking in the GNAT reference manual at the description of the
WCEM Form parameter to Wide_Text_IO.Open.  It describes the different
ways that wide characters can be represented in text files that
Wide_Text_IO can interpret.

However, at first glance, I didn't see a way to get Wide_Text_IO to
read a UCS-1 text file.  This is the encoding where each byte in the
range  16#00#..16#FF# represents a character in the range
Wide_Character'Val(16#0000#) .. Wide_Character'Val(16#00FF#), and there
is no way to represent wide characters from 16#0100# to 16#FFFF#.  In
other words, a boring old-fashioned 8-bit text file, maybe with Latin-1
characters or control characters in the 80..9F range.  Yes, I know that
a file like this could be read using Text_IO, but let's say that we
don't know what format the file is in until runtime.

Does GNAT's Wide_Text_IO have a way to read a file like this?

                        -- thanks, Adam