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Re^7: Split any number into string of 8-bit hex values (=1 byte)

by AnomalousMonk (Bishop)
on Aug 30, 2021 at 22:53 UTC ( #11136259=note: print w/replies, xml ) Need Help??


in reply to Re^6: Split any number into string of 8-bit hex values (=1 byte)
in thread Split any number into string of 8-bit hex values (=1 byte)

Here's an sprintf approach that avoids regex fireworks:

Win8 Strawberry 5.30.3.1 (64) Mon 08/30/2021 18:36:38 C:\@Work\Perl\monks >perl -Mstrict -Mwarnings my @n_list = (0, 1, 255, 256, 65535, 65536, 16777215, 16777216, 429496 +7295,); sub n2hstr_2 { # compatible with perl version 5.8 return join ' ', map { my $w = $_ > 65535 ? 8 : $_ > 255 ? 4 : 2; unpack '(a2)*', sprintf '%0*x', $w, $_; } @_ ; } sub number2hexString { my $output; my $packTemplate; foreach my $i (@_) { if ($i > 65535) { $packTemplate = 'L>'; } elsif ($i > 255) { $packTemplate = 'S>'; } else { $packTemplate = 'C'; } $output .= join(' ', unpack('(H2)*', pack($packTemplat +e, $i))).' '; } return $output; } my $n_n2hstr = n2hstr_2 (@n_list); my $n_number2hexString = number2hexString(@n_list); print "@n_list \n"; print "'$n_n2hstr' \n"; print "'$n_number2hexString' \n"; ^Z 0 1 255 256 65535 65536 16777215 16777216 4294967295 '00 01 ff 01 00 ff ff 00 01 00 00 00 ff ff ff 01 00 00 00 ff ff ff ff' '00 01 ff 01 00 ff ff 00 01 00 00 00 ff ff ff 01 00 00 00 ff ff ff ff +'
As you see, the outputs are the same — except that number2hexString() adds an extra space at the end of the output string! I don't attempt to handle negative numbers since I don't yet understand how they should be handled.


Give a man a fish:  <%-{-{-{-<

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Re^8: Split any number into string of 8-bit hex values (=1 byte)
by tybalt89 (Prior) on Aug 30, 2021 at 22:59 UTC

    Hey, I like regex fireworks :)

      So do I, but it's a guilty pleasure!


      Give a man a fish:  <%-{-{-{-<

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