Had the same issue, and some research came up with the following code:

use strict;

my $debug=0;

sub readUInt8
    {
    my ($fh) = @_;
    my $data;

    read($fh, $data, 1);

    return unpack("C", $data);
    }


sub readUInt16
    {
    my ($fh) = @_;
    my $data;

    read($fh, $data, 2);

    return unpack("n16", $data);
    }


sub skipBytes
    {
    my ($fh, $len) = @_;
    my $data;

    printf("  Skipping %d bytes\n", $len) if ($debug);
    read($fh, $data, $len);
    }


sub skipSection
    {
    my ($fh, $v) = @_;
    my $len = readUInt16($fh);

    skipBytes($fh, $len-2);
    }


sub getImageInfo
    {
    my ($filename) = @_;
    my $v;
    my $fh;
    my $width=0;
    my $height=0;
    my $type="";

    open($fh, $filename);
    binmode($fh);

    $v = readUInt16($fh);

    if ($v == 0xffd8)
        {
        my $done=0;

        while (!$done)
            {
            $v = readUInt16($fh);
            printf("Section %x\n", $v) if ($debug);
            if ($v == 0xffe0
                || $v == 0xffdb
                || $v == 0xffe0
                || $v == 0xffe1
                || $v == 0xffe2
                || $v == 0xffe3
                || $v == 0xffe4
                || $v == 0xffe5
                || $v == 0xffe6
                || $v == 0xffe7
                || $v == 0xffe8
                || $v == 0xffe9
                || $v == 0xffea
                || $v == 0xffeb
                || $v == 0xffec
                || $v == 0xffed
                || $v == 0xffee
                || $v == 0xffc4
                || $v == 0xffe0
                || $v == 0xfffe
                )
                {
                skipSection($fh, $v);
                }
            elsif ($v == 0xffdd)
                {
                skipBytes($fh, 4);
                }
            elsif ($v == 0xffc0)
                {
                $v = readUInt16($fh);    # len
                $v = readUInt8($fh);    # precision
                $height = readUInt16($fh);    # width
                $width = readUInt16($fh);    # height
                $type = "jpg";
                last;
                }
            else
                {
                printf("$filename - Unexpected value %x\n", $v);
                last;
                }
            }
        }

    close($fh);

    return ($type, $width, $height);
    }
[download]

---

---

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! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

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:
	&		&
	<		&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.