in reply to Using pack/unpack on a PNG file

Somehow in searching for info, I didn't come across Pack/Unpack Tutorial (aka How the System Stores Data) until now, and it's shining a huge light on the whole thing, so it seems I should be able to figure this out after all.

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Re^2: Using pack/unpack on a PNG file
by AnomalousMonk (Archbishop) on May 26, 2015 at 03:18 UTC

    See also perlpacktut.

    Update: In general, pack/unpack are almost as much fun as regexes!

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Re^2: Using pack/unpack on a PNG file
by AnomalousMonk (Archbishop) on May 26, 2015 at 03:28 UTC

    Also consider: 

    c:\@Work\Perl\monks\sierpinski>perl -wMstrict -le
"my $s = 'some string -- could be any length';
 ;;
 my $up = unpack 'a*', $s;
 $s eq $up or die 'A: not identity operation';
 ;;
 my $p = pack 'a*', $up;
 $s eq $p or die 'B: not identity operation';
 ;;
 print 'a-ok';
"
a-ok

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