Description:
------------
When using zip pecl to modify any Nokia S40 theme file (which have a .nth extension, but are actually zip archives), that's been created with the official Nokia S40 Theme Studio (v2.2), the resulting archive becomes corrupt. The contents of the archive can be extracted, but cannot be deleted. Nokia theme studio is also unable to open the archive unless I rebuild the zip by extracting all the files; manually creating a new zip file with either the zip pecl or windows explorer; and re-add all files.

This problem only occurs if the original nth theme file is saved with Nokia theme studio (of which the vast majority are) and modified with the zip pecl (note: there are no problems if modified with winzip or winrar). 

When modifying an nth file *created* with zip pecl, explorer, winrar or winzip, the archive will not become corrupt. I have included an example of this (see: themefile-rebuildfromcorrupt-ok.nth - I extracted files from corrupt folder and created this using win explorer) along with corrupted archives within the following zip: http://markw.fireflyinternet.com/nkthemefiles.zip

I've tried modifying a theme studio generated archive (theme) using zip pecl on a Linux CentOS 4.5 installation and my Vista x64 desktop (both latest PECL and PHP 5.2.3). In both cases, the resulting archive becomes corrupt (tested on XP and Vista). If opening in theme studio, I get the error, "Invalid entry size (expected 2806841352 but got 19670 bytes)".

Reproduce code:
---------------
error_reporting(E_ALL);
$zip = new ZipArchive();
$filename = "themefile-unmodified-ok.nth";

if ($zip->open($filename) !== true) {
	exit "cannot open <$filename>\n";
} else {
	echo "file <$filename> OK\n";
}
$zip->addFromString("test.txt", "0123456789");

var_dump($zip->close());
var_dump($zip);

Expected result:
----------------
themefile-unmodified-ok.nth should not become corrupt. After executing the code, rename and open the nth file as a zip archive, then try deleting a file within it. A "corrupt" error will be returned. Note: themefile-unmodified-ok.nth is created with Nokia S40 Theme Studio.

Actual result:
--------------
themefile-unmodified-ok.nth becomes corrupt (see themefile-modifiedwithpecl-corrupt.nth).