My upload script does pretty much the same thing, with one tweak to handle newline conversion when uploading text from a Wintel box. (My ISP has CGI.pm 1.45, and I haven't had noticed any problems uploading.) 
my $stripCRs = param('filetype') eq 'text';
...
while ( <$upload> ) {
    s/\r// if $stripCRs;
    print UPLOAD $_;
}

[download]
Getting a pair of radio buttons on the upload form for 'text' and 'binary' is left as an exercise.

In reply to Tweaking the upload script for Ascii by dws
in thread CGI.pm file upload freaking me out by Trimbach

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