You may find your problem by just putting together a snippet of code for us to look at, as Grandfather suggests, but if you don't find it, this forum will then have something to work with. As an additional way to characterize the problem, you might try the following command lines: 
perl -e print(pack('II',0x085c,0x5c080000)); > temp.pk
perl -e "print(pack('NN',map($_*2,unpack('II',<>))));" > temp2.bk
perl -e "printf('%8x:%8x',unpack('NN',<>));"  temp2.pk
produces -->     10b8:b8100000  (as expected)

[download]
They look like they do what you describe, but the numbers come out as expected, at least on my windows box. If the numbers come out right on your system, then take a look at what you're doing that's different from the examples, or show us and someone here will certainly take a look at it.

In reply to Re: Data munging - in, out and something in between by rodion
in thread Data munging - in, out and something in between 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, 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.