Re: Should I write building blocks?

On Sat, 25 Jan 2025 03:59:25 -0000 (UTC), Rich wrote:

[1] Don't worry if you don't know what a 'hash function' is right now,
that's not terribly important for this discussion here, and you can
look it up on Wikipedia if you don't know but really want to know.

**************************

Hey, I know what a hash function is. I use it all the time to check the
integrity of ISO images.

In fact, I have written - and shared - a Tcl script that uses it:

set ::hashMethod tcllib
foreach i {sha512sum sha384sum sha256sum sha224sum sha1sum md5sum} {
if {[catch {set ::hashMethod [exec which $i]} _catchError]} {
continue
} else {break}
}

if {$::hashMethod == "tcllib"} {
if {[catch {package require sha256} _catchError]} {
puts "ERROR! Impossible to proceed. Please install at least one of these packages: "
puts "sha512sum, sha384sum, sha256sum, sha224sum, sha1sum, md5sum, or tcllib."
puts "Note: tcllib is considerably slower than all the others."
puts ""
exit
}
}

That was 10 years ago. I wonder if the tcllib implementation has been
optimized since then.


Thank you for all the advice.

--
Luc

>