#49660 [Opn->Csd]: libxml 2.7.3+ limits text nodes to 10MB
ID: 49660
Updated by: felipe@php.net
Reported By: sta at netimage dot dk
-Status: Open
+Status: Closed
Bug Type: SOAP related
Operating System: FreeBSD 7.1
-PHP Version: 5.2.11
+PHP Version: *
New Comment:
This bug has been fixed in SVN.
Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
Thank you for the report, and for helping us make PHP better.
Previous Comments:
------------------------------------------------------------------------
[2009-12-01 02:05:29] svn@php.net
Automatic comment from SVN on behalf of felipe
Revision: http://svn.php.net/viewvc/?view=revision&revision=291533
Log: - Fixed bug #49660 (libxml 2.7.3+ limits text nodes to 10MB).
(Felipe)
- Added LIBXML_PARSEHUGE constant to overrides the maximum text size of
a
single text node when using libxml2.7.3+. (Kalle)
[DOC]
------------------------------------------------------------------------
[2009-09-28 11:31:14] sta at netimage dot dk
Hi Kalle.
Thanks for replying so soon.
Your patch does fix the issue when loading directly with
simplexml_load_file('file.xml', 'SimpleXMLElement', LIBXML_PARSEHUGE);
However the error was not originally encountered using simplexml, but
using SoapClient - and there does not seem to be a way to pass
libxml-options to SoapClient.
So as far as I can tell, the problem remains when using SoapClient.
/Thing
------------------------------------------------------------------------
[2009-09-26 12:12:14] kalle@php.net
I guess we could expose the constant value from ext/libxml if available
like:
Index: libxml.c
===================================================================
--- libxml.c (revision 288659)
+++ libxml.c (working copy)
@@ -622,6 +622,9 @@
REGISTER_LONG_CONSTANT("LIBXML_COMPACT", XML_PARSE_COMPACT, CONST_CS
| CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("LIBXML_NOXMLDECL", XML_SAVE_NO_DECL, CONST_CS
| CONST_PERSISTENT);
#endif
+#if LIBXML_VERSION >= 20703
+ REGISTER_LONG_CONSTANT("LIBXML_PARSEHUGE", XML_PARSE_HUGE, CONST_CS
| CONST_PERSISTENT);
+#endif
REGISTER_LONG_CONSTANT("LIBXML_NOEMPTYTAG", LIBXML_SAVE_NOEMPTYTAG, CONST_CS
| CONST_PERSISTENT);
/* Error levels */
Does this work for you when passing it to SimpleXML's $option
parameter?
(Patch made against PHP_5_3, but is just a 3 line c/p to other
branches)
------------------------------------------------------------------------
[2009-09-24 15:37:58] sta at netimage dot dk
Description:
------------
Since version 2.7.3 libxml limits the maximum size of a single text
node to 10MB.
The limit can be removed with a new option, XML_PARSE_HUGE.
PHP has no way to specify this option to libxml.
I found the bug when making af SOAP-request where the reply contained a
20MB string.
SoapClient->__call() threw an exception: 'looks like we got no XML
document'
Using libxml_use_internal_errors(true) and libxml_get_errors() I could
narrow it down to a LibXMLError, code 5, 'Extra content at the end of
the document' - but the specified line and column was in the middle of a
large text node.
Using SoapClient->__getLastResponse() I saved the response to a file.
The xmllib program xmllint then revealed the cause:
> xmllint --noout soap_response.txt
soap_response.txt:111834: error: xmlSAX2Characters: huge text node: out
of memory
We need a way to specify the XML_PARSE_HUGE option to libxml - perhaps
something like a new function: libxml_parse_huge(true).
Reproduce code:
---------------
<?php
$xml = "<?xml version='1.0' encoding='utf-8' standalone='yes'
?><test>"
. str_repeat('A', 12000000) . "</test>";
file_put_contents('file.xml', $xml);
$sxe = simplexml_load_file('file.xml');
if ($sxe instanceof SimpleXMLElement) {
echo 'OK\n';
}
else {
var_dump($sxe);
}
Expected result:
----------------
OK
Actual result:
--------------
PHP Warning: simplexml_load_file(): file.xml:1: error:
xmlSAX2Characters: huge text node: out of memory in
/usr/dana/data/developers/holst/mobilmap/cron/xml.php on line 5
PHP Warning: simplexml_load_file():
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
in /usr/dana/data/developers/holst/mobilmap/cron/xml.php on line 5
PHP Warning: simplexml_load_file():
^ in
/usr/dana/data/developers/holst/mobilmap/cron/xml.php on line 5
bool(false)
------------------------------------------------------------------------
--
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