Looks a little over-engineered to me. So here's a version I knocked together 
use strict;
use warnings;

@ARGV == 2 or die("Usage: $0 FILE PARTS\n");
my($file,$partsize) = @ARGV;

my $filesize = -s $file or die("ack: $!");
my $div = $filesize / $partsize;

my $cnt = 0;
open(my $fh, $file) or die("ack: $!");
{
  local $/ = \$div;
  while($filesize > 0) {
    open(my $chunk, ">${file}.chunk$cnt") or die("ack: $!");
    print $chunk scalar <$fh>;
    $filesize -= $div;
    $cnt++;
  }
}

[download]
Not sure if it works perfectly everytime, but it should achieve roughly what you want (otherwise, tweak at will ;).
HTH

_________
broquaint

In reply to Re: Chopping a file into pieces by broquaint
in thread Chopping a file into pieces by coldmiser

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, details, 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, summary, 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.