Description:
------------
The getimagesize() function fails on specific JPEG files. The reason is that php_next_marker() in:

ext/standard/image.c

has an artificial limit of 10 imposed on the number of 0xFF records that are found in sequential order. As far as I can tell ... the JPEG file format standards impose no such limit (see, http://www.jpeg.org/public/jfif.pdf). The proper behaviour should be to continue to read for the next marker until:

(1) M_SOS is found, in which case, image data has begun and no more headers will occur
(2) M_EOI has occurred (End of Image header) - this is the proper behavior in a properly encoded image
(3) EOF - something's wrong - but, at least it's not getimagesize()

I've provided an example of a JPEG file that will fail using getimagesize() online at:

http://www.townnews.com/contrib/premature.jpg

A fix is easily added by removing the artificial limit and just incrementing "a" in the marker's main loop around line 404:

if (++a > 10)
{
    /* who knows the maxim amount of 0xff? though 7 */
    /* but found other implementations              */
    return M_EOI;

}

I realize this may be in place to prevent infinite loops, but the reality is EOF will do that for us anyway. To fix the problem, just switch that code hunk too:

a++;

Reproduce code:
---------------
<?php

$sURL = "http://www.townnews.com/contrib/premature.jpg";
print_r(getimagesize($sURL));

?>

Expected result:
----------------
Array
(
    [0] => 350
    [1] => 603
    [2] => 2
    [3] => width="350" height="603"
    [bits] => 8
    [channels] => 3
    [mime] => image/jpeg
)