Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical

Comment on

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

Dear Monks,

I'm trying to find the best way to code/decode binary data to be transferred between client machines and server machine(s). Different operating systems change or delete characters in the stream. Pack/unpack is better than any regex I could come up with, but it doubles the size of the data transferred. MIME::Base64 is better than pack/unpack. The 'Simple Copy' step is obviously the fastest possible but can't be used for inter-machine communication.

Is there something better than MIME::Base64?

This script shows the best of what I have tested:

use strict; use Benchmark qw(:all); use MIME::Base64; our $src = ""; for ( 0..255 ) { $src .= chr( $_ ); } my $count = 0; print "case1: pack/unpack -- ", &case1, " size, $count, \n"; print "case2: MIME::Base64 -- ", &case2, " size, $count, \n"; print "case3: Simple Copy -- ", &case3, " size, $count, \n"; timethese ($count, { case1 => sub {&case1}, case2 => sub {&case2}, case3 => sub {&case3}, }, ); cmpthese ($count, { case1 => sub {&case1}, case2 => sub {&case2}, case3 => sub {&case3}, }, ); sub case1 { # print "case1\n"; our $src; my $result = unpack("H*", $src ); my $back = pack("H*", $result ); if ( $src ne $back ) { print "1 ne\n"; exit; } return length( $result ); } sub case2 { # print "case2\n"; our $src; my $result = encode_base64($src,""); my $back = decode_base64( $result ); if ( $src ne $back ) { print "2 ne\n"; exit; } return length( $result ); } sub case3 { # print "case3\n"; our $src; # my $result = $src; my $back = $src; if ( $src ne $back ) { print "3 ne\n"; exit; } return length( $back ); } __END__ email7:/usr/local/apache/prefork/cgi-bin/t# pyrperl Hex_vs_B64.plx case1: pack/unpack -- 512 size, 0, case2: MIME::Base64 -- 344 size, 0, case3: Simple Copy -- 256 size, 0, Benchmark: running case1, case2, case3 for at least 3 CPU seconds... case1: 4 wallclock secs ( 3.14 usr + 0.00 sys = 3.14 CPU) @ 14 +2625.48/s (n=447844) case2: 3 wallclock secs ( 3.11 usr + 0.00 sys = 3.11 CPU) @ 20 +4192.93/s (n=635040) case3: 4 wallclock secs ( 3.18 usr + 0.00 sys = 3.18 CPU) @ 11 +99358.18/s (n=3813959) Rate case1 case2 case3 case1 141559/s -- -31% -88% case2 205511/s 45% -- -83% case3 1203509/s 750% 486% --

Thank you

"Well done is better than well said." - Benjamin Franklin

In reply to Best technique to code/decode binary data for inter-machine communication? by flexvault

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?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others avoiding work at the Monastery: (4)
    As of 2018-01-17 20:48 GMT
    Find Nodes?
      Voting Booth?
      How did you see in the new year?

      Results (206 votes). Check out past polls.