Description:
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Both fpassthru and readfile chop large file.

Similar bugs are reported in PHP versions
5.0.1 (Closed, solved in a snapshot, bug #29801)
4.2.4-dev
4.1.1

But it seems it has been reintroduced now in 5.0.4.


Reproduce code:
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// This file is 4mb large.
$file = "pdf-letter-2.4.1.tar.bz2";
header('Content-type: application/*');
header('Content-length: '.filesize($file));
readfile($file);

Expected result:
----------------
the whole file

Actual result:
--------------
about 1.9mb of the contents