Beefy Boxes and Bandwidth Generously Provided by pair Networks
We don't bite newbies here... much
 
PerlMonks  

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

Thanks. I keep forgetting how broken un/pack are in this respect. Having "B6" load the high six bits (of the low byte of the integer) is just non-sensical.

So for the most sane configuration (bits split based on base-2 representation not some "ascending bit order" representation) you have to work harder:

my @fields= unpack "C*", # 16 6-bit numeric values pack "b6"x16, # string of 16 bytes, each holding a 6-bit value map ''.reverse, # 16 6-character ascending-bit strings unpack "a6"x16, # 16 6-character base-2 strings unpack "B*", # 96-character base-2 string "twelve bytes"; # 12-byte packed string print "(@fields)\n"; my $string= pack "B*", # 12-byte packed string pack "a6"x16, # 96-character base-2 string map ''.reverse, # 16 6-character base-2 strings unpack "b6"x16, # 16 6-character ascending-bit strings pack "C*", # string of 16 bytes, each holding a 6-bit value @fields; # 16 6-bit numeric values print "($string)\n";

outputs:

(29 7 29 37 27 7 25 37 8 6 9 57 29 6 21 51) (twelve bytes)

- tye        


In reply to Re^4: pack/unpack 6-bit fields. (insanity) by tye
in thread pack/unpack 6 bit fields. by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    [stevieb]: I *finally* have my automated RPi::WiringPi and related distribution automated test build system done! It's easy to use (relatively), simple to set up, and works awesome! Cycles every X mins, checks github for new commits, and builds...
    [stevieb]: ...optionally displaying the results to a connected LCD with the dist name, date, time and commit of the last run along with a FAIL/PASS. Obviously I can't get CI with Travis for a RPi, so I built my own :) It'll take a couple of blog posts I think...
    [stevieb]: ...to cover it all. Awesome thing is that you can dispatch ANY distribution to it (and include all revdeps if desired), and it works all the same as if I'm just testing the RPI code itself
    [stevieb]: I'm rather pleased with myself and everything I've leared along this arduous and sometimes frustrating path
    [stevieb]: Just need to implement an email plugin or something so I can get alerted remotely if the status of a build has changed from the last run

    How do I use this? | Other CB clients
    Other Users?
    Others pondering the Monastery: (6)
    As of 2017-04-28 21:42 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?
      I'm a fool:











      Results (529 votes). Check out past polls.