Re: [xml] xmlReadFile Fails Where xmlParseFile Succeeds

2015-10-16 Thread Daniel Veillard 
On Mon, Jul 27, 2015 at 02:38:23PM -0400, Paul Braman wrote:
> The following bit of code fails
> 
> xmlInitParser();
> xmlDocPtr maindoc = xmlReadFile("maindoc.xml", NULL, 0);
> xmlDocPtr subdoc = xmlReadFile("subdoc.xml", NULL, 0);
> xmlNodePtr content = xmlDocGetRootElement(subdoc);
> xmlUnlinkNode(content);
> xmlAddChild(xmlDocGetRootElement(maindoc), content);
> xmlFreeDoc(subdoc);
> xmlFreeDoc(maindoc);
> xmlCleanupParser();
> 
> 
> with a crash upon calling xmlFreeDoc(maindoc) (problem freeing memory)
> where this code succeeds just fine and dandy
> 
> xmlInitParser();
> xmlDocPtr maindoc = xmlParseFile("maindoc.xml");
> xmlDocPtr subdoc = xmlParseFile("subdoc.xml");
> xmlNodePtr content = xmlDocGetRootElement(subdoc);
> xmlUnlinkNode(content);
> xmlAddChild(xmlDocGetRootElement(maindoc), content);
> xmlFreeDoc(subdoc);
> xmlFreeDoc(maindoc);
> xmlCleanupParser();
> 
> 
> I understand I should use xmlReadFile instead of xmlParseFile. However, I
> can't figure on what's different between the two that could be causing the
> crash in the first block of code?
> 
> Note, I've tried with multiple versions, even 2.9.2.
> 
> Alternatively, how *should* I be structuring the code to do what I'm doing
> here? (I know a call to
> 
> xmlAddChild(xmlDocGetRootElement(maindoc),
> xmlCopyNode(xmlDocGetRootElement(subdoc), 1));
> 
> 
> in place of the get/unlink/add sequence works but I'd like to understand
> why the code above fails.)

  the problem is dictionaries. the Read* function boost the processing speed
by using a dictionary for all the strings in markup etc. The dictionary is
allocated to the document. when moving content you have pointers from that
part of the subdoc to subdoc dictionary which get pruned to maindoc using
a different dictionary. When trying to free the reference to the local document
dictionary is lost, libxml2 then tries to free the strings from subdoc
dictionary and that fails.
  2 ways around that:

  Option 1: disable dictionaries when parsing if you do that kind of copy
 paste between documents (XML_PARSE_NODICT option see parser.h)

  Option 2: do the tweaking so that all the files get parsed  with the same
 dictionary shared by all documents, more complex, libxslt does that for
 example, I don't have a simple document explaining it unfortunately.

Daniel

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Re: [xml] Compiling libxml2 against musl

2015-10-16 Thread Daniel Veillard 
On Tue, Dec 09, 2014 at 09:35:16PM +0100, Michael Heimpold wrote:
> Hi,

  Hi Michael, (a bit late :-\)

> I'm maintaining the libxml2 package on OpenWrt. Some weeks ago, there was a 
> bug filed
> against the package, regarding a failure to compile libxml2 against musl c 
> library.
> See https://github.com/openwrt/packages/issues/454
> 
> There is also a reference to your bug tracker:
> https://bugzilla.gnome.org/show_bug.cgi?id=704908

  right, closing it

> And a link to a potential fix for this:
> http://git.alpinelinux.org/cgit/aports/tree/main/libxml2/libxml2-pthread.patch
> 
> Would be nice, if you could give some feedback, e.g. whether the proposed 
> patch
> could be considered.

  if there was a __MUSL__ macro defined we could have used that
but the http://wiki.musl-libc.org/wiki/FAQ#Q:_why_is_there_no_MUSL_macro_.3F
means that we deactivate for all non Glibc libs on Linux because of their
stance.

  In any case the current git head seems to carry that patch,

   thanks,

Daniel
> Thanks,
> Michael
> 
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Re: [xml] v2.9.2 regression when using absolute paths without file: scheme in catalog?

2015-10-16 Thread Daniel Veillard 
On Fri, Mar 27, 2015 at 09:58:59AM +0100, Matthias Pigulla wrote:
> Sorry for submitting a semi-finished message :(
> 
> 
> What I wanted to say was - can anyone tell me whether this is a regression
> in 2.9.2 or should I look for help in other places (which)?
> 
> Thanks a lot
> Matthias 

  Hi Matthias,

someone else reported catalog issues (but on Windows when switching to 2.9.2).
I guess one would have to bissect to find the guilty commit, that would help
understanding if it's really intended or a broken side effect,

 thanks

Daniel

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Re: [xml] HTMLtree.c escapes braces

2015-10-16 Thread Daniel Veillard 
On Thu, Sep 24, 2015 at 10:12:25PM +, Bruce Sinclair wrote:
> Hi Daniel,
> 
> We have had the issue that libxml2 encodes curly braces as character 
> references in HTML output because of the following code in HTMLtree.c:
> 
>escaped = xmlURIEscapeStr(tmp, BAD_CAST"@/:=?;#%&,+");
>if (escaped != NULL) {
> xmlBufferWriteQuotedString(buf->buffer, escaped);
> xmlFree(escaped);
> } else {
> xmlBufferWriteQuotedString(buf->buffer, value);
> }
> 
> We don't think the curly braces, "{" and "}", should be changed to character 
> references.  Doing so causes a problem with the use of braces in a Server 
> Response File (SRF) generated with libxml2.  We change the first line of the 
> above code to:
> 
>escaped = xmlURIEscapeStr(tmp, BAD_CAST"@/:=?;#%&,+{}");
> 
> to eliminate this issue.  Could this be accepted as a fix to libxml2?
> 

  Hi Bruce,

  I don't understand, that code is in attribute content escaping, and
for me "{" and "}" are not escaped:

thinkpad2:~/XML -> cat ./tst.html





thinkpad2:~/XML -> ./xmllint --html ./tst.html
http://www.w3.org/TR/REC-html40/loose.dtd;>





thinkpad2:~/XML -> 

Please provide a reproducer with xmllint so I understand what is going on,

  thanks,

Daniel

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Re: [xml] How do I go about adding missing entities to libxml2?

2015-10-16 Thread Daniel Veillard 
On Tue, Aug 04, 2015 at 05:59:11PM +1000, Sam Saffron wrote:
> We have a bunch of missing entities (that flows through to other libs
> like nokogiri ruby gem)
> 
> for example 
> https://meta.discourse.org/t/certain-unicode-entities-are-being-escaped/19898
> 
> What do I need to do to get them into libxml2 ?

  you get them in a DTD referenced and loaded by your document. It's not
an XML predefined entity so your document has to define what it means

Daniel

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Re: [xml] indentation (again!)

2015-10-16 Thread Daniel Veillard 
  Hi Bruce,

On Sat, Jul 25, 2015 at 08:12:39AM -0400, Bruce Miller wrote:
> Hi all;
>   I find unindented XML to be virtually impossible
> to debug, but...
  
  :-)

> Frankly, I'm impressed at how good the built-in heuristic
> for formatting works (apparently the rule is: once it sees
> mixed content, it turns off indentation below that level).
> Of course, it isn't "correct" and is occasionally giving me
> really messy problems.
> 
> In principle, and perhaps naively, it seems the Correct rule
> is rather simple, provided you have access to the DTD/Schema/whatever.

 The only correct rule is if there is a character on input it goes
on output, the indentation is a trick but not what the standard suggests

> Namely, if an element allows mixed content, do not add whitespace.
> (and you CAN apply indentation on descendants that do NOT allow mixed
> content).
> 
> Is there some switch or method that I'm overlooking to
> achieve this effect?

  no, indeed this would make sense ... assuming you have a schemas, etc...
but when you serialize a document while the DTD *might* be available
you can't really find out he RNG or XSD associated (or trust them, download
them, etc) it open a can of worm TBH.

> Is this likely to be relatively easy
> to implement? (I've managed to avoid learning libxml2's C API,
> as I use it via Perl's XML::LibXML.)
> 
> I'd hate to have to give up indentation or write
> my own serializer

  have you looked at xmllint --pretty 2

it does pretty printing but without adding (or removing) any significant
character, it uses only the non-significant spaces  from within markup
which are discarded at parsing time.

  I know it's not what you asked for but might still be useful :-)

Daniel

> Thanks;
> bruce
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Re: [xml] [libxslt] GPL-licensed file being distributed with MIT-licensed libxslt

2015-10-16 Thread Daniel Veillard 
On Wed, Sep 16, 2015 at 11:11:53PM +0200, Nick Wellnhofer wrote:
> On 16/09/2015 22:51, Mike Dalessio wrote:
> >It appears as though the file
> >
> > libxslt-1.1.28/doc/tutorial2/libxslt_pipes.c
> >
> >is GPL licensed.
> >
> >This file is being distributed in the libxslt source tarball, which is at 
> >odds
> >with libxslt's MIT license.
> 
> The same goes for doc/tutorial/libxslt_tutorial.c which libxslt_pipes.c
> claims to be based on. Both files are based on the MIT-licensed xsltproc.c
> but there's nothing wrong with that.
> 
> >Any thoughts on what, if anything, should be done about it?
> 
> It's only part of the documentation, so I don't see a problem.

  Simplest is to find and ask the authors if they are fine relicencing
those, hopefully they see no problem and I will fix this, I tried to contact
them, let's see how it goes,

Daniel

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Re: [xml] Schema validation when using an xml catalog of OGC schemas offline

2015-10-16 Thread Daniel Veillard 
On Tue, Oct 13, 2015 at 12:37:27PM +0100, Ricardo Filipe Soares Garcia da wrote:
> Hi list

  Hi Ricardo,

> I'm trying to prepare an XML catalog for working with OGC schemas[1], more
> concretely the csw 2.0.2 schema[2].
> 
> This catalog's purpose is to use my locally downloaded schemas instead of
> fetching them from OGC's repository every time I need to validate something.
> 
> when I use xmllint without my catalog, the testing file[3] gets validated
> OK, but the process takes a while, because the schemas have to be fetched
> over the network:

  okay

> # bash
> export XML_DEBUG_CATALOG=1
> 
> xmllint --load-trace --noout --schema
> /home/geo2/dev/xmlschemas/SCHEMAS_OPENGIS_NET/csw/2.0.2/CSW-discovery.xsd
> /home/geo2/dev/xmlschemas/SCHEMAS_OPENGIS_NET/csw/2.0.2/examples/capabilities/Capabilities_tC22.xml
> 
> 
> ... (lots of downloading of schemas happening here)
> 
> Loaded
> URL="/home/geo2/dev/xmlschemas/SCHEMAS_OPENGIS_NET/csw/2.0.2/examples/capabilities/Capabilities_tC22.xml"
> ID="(null)"
> /home/geo2/dev/xmlschemas/SCHEMAS_OPENGIS_NET/csw/2.0.2/examples/capabilities/Capabilities_tC22.xml
> validates
> 
> Now after downloading the whole opengis schemas, plus the W3C's xlink and
> xml schemas into some common directory I have built a catalog file like
> this:
> 
> 
> 
>   http://www.w3.org/;
> rewritePrefix="/home/geo2/dev/xmlschemas/w3c/"/>
>   http://schemas.opengis.net/;
> rewritePrefix="/home/geo2/dev/xmlschemas/SCHEMAS_OPENGIS_NET/"/>
> 

  That should work though it might be better to be a bit more selective
i.e. give more focused uriStartString values

> When trying this out, xmllint fails saying that it cannot even compile the
> schema:
> 
> # bash
> export XML_CATALOG_FILES=/home/geo2/dev/lixo/test_catalog.xml
> 
> xmllint --load-trace --nonet --noout --schema
> /home/geo2/dev/xmlschemas/SCHEMAS_OPENGIS_NET/csw/2.0.2/CSW-discovery.xsd
> /home/geo2/dev/xmlschemas/SCHEMAS_OPENGIS_NET/csw/2.0.2/examples/capabilities/Capabilities_tC22.xml

  Don't disable net, if you're missing one reference it may fail, it's
better to run with the network and see if it still tries to transfer something

> ... (everything is fetched from my local repository, but eventually I start
> getting errors like this)
> 
> Resolve: sysID http://schemas.opengis.net/gml/3.1.1/smil/smil20.xsd
> Resolve URI http://schemas.opengis.net/gml/3.1.1/smil/smil20.xsd
> Using rewriting rule http://schemas.opengis.net/
> Loaded URL="http://schemas.opengis.net/gml/3.1.1/smil/smil20.xsd;
> ID="(null)"
> Loaded
> URL="/home/geo2/dev/xmlschemas/SCHEMAS_OPENGIS_NET/gml/3.1.1/smil/smil20-language.xsd"
> ID="(null)"
> /home/geo2/dev/xmlschemas/SCHEMAS_OPENGIS_NET/gml/3.1.1/smil/smil20-language.xsd:33:
> element import: Schemas parser warning : Element '{
> http://www.w3.org/2001/XMLSchema}import': Skipping import of schema located
> at
> '/home/geo2/dev/xmlschemas/SCHEMAS_OPENGIS_NET/gml/3.1.1/smil/smil20.xsd'
> for the namespace 'http://www.w3.org/2001/SMIL20/', since this namespace
> was already imported with the schema located at '
> http://schemas.opengis.net/gml/3.1.1/smil/smil20.xsd'.

  so the same schemas is referenced from 2 different location, that sounds
bad, are they actually identical. If they embedded a copy to be able to
tweak it that may result in the following errors if you don't load their
version.

> Loaded
> URL="/home/geo2/dev/xmlschemas/SCHEMAS_OPENGIS_NET/gml/3.1.1/base/temporalReferenceSystems.xsd"
> ID="(null)"
> Loaded
> URL="/home/geo2/dev/xmlschemas/SCHEMAS_OPENGIS_NET/gml/3.1.1/base/temporalTopology.xsd"
> ID="(null)"
> /home/geo2/dev/xmlschemas/SCHEMAS_OPENGIS_NET/filter/1.1.0/filter.xsd:31:
> element element: Schemas parser error : Element '{
> http://www.w3.org/2001/XMLSchema}element': A global element declaration '{
> http://www.opengis.net/ogc}_Id' does already exist.
> /home/geo2/dev/xmlschemas/SCHEMAS_OPENGIS_NET/filter/1.1.0/filter.xsd:34:
> element element: Schemas parser error : Element '{
> http://www.w3.org/2001/XMLSchema}element': A global element declaration '{
> http://www.opengis.net/ogc}FeatureId' does already exist.
> 
> ... (and it finally fails with)
> 
> WXS schema
> /home/geo2/dev/xmlschemas/SCHEMAS_OPENGIS_NET/csw/2.0.2/CSW-discovery.xsd
> failed to compile
> 
> So it seems that there is something missing from my xml catalog. It is
> almost working (no files are being downloaded from the network). I've been
> looking at libxml2's docs on catalogs[4], and also the OASIS spec[5], but I
> haven't been able to make much more from it.
> 
> Thanks for your help

  I'm afraid I don't know, more debug seems needed, try the suggested steps

Daniel

> [1] - http://schemas.opengis.net/
> [2] -http://schemas.opengis.net/csw/2.0.2/CSW-publication.xsd
> [3] -
> http://schemas.opengis.net/csw/2.0.2/examples/capabilities/Capabilities_tC22.xml
> [4] - http://xmlsoft.org/catalog.html
> [5] -
> https://www.oasis-open.org/committees/entity/spec-2001-08-06.html#s.public
> 
> -- 
>

Re: [xml] Continuous integration for libxml2?

2015-10-16 Thread Daniel Veillard 
On Fri, Oct 16, 2015 at 02:06:30PM +0100, David Drysdale wrote:
> Hi folks,

  Hi David,

> Does libxml2 have a continuous integration system running over it somewhere?

 Not that I know of :)
TBH the rate of changes is fairly slow, i.e. the code is mature (some
will call it overripe even !) and while there is bugs, compared to the
size of the system it's relatively small. 

> I've recently been exploring continuous integration systems and I used
> libxml2 as a guinea pig for getting various tools working in
> combination.  Specifically, I've got a GitHub clone [1] of the repo
> that links in with Travis [2]; once I added a few small local fixes
> [3], I got the tests running on {gcc,clang} x {linux,osx} plus ASAN,
> UBSAN and coverage [4] runs.

  The biggest issue I have is non-linux, I never use Windows or Macs
and I have zero clue that a change there could break the build or else.
There are mingw builds of libxml2 done within Red Hat but that's not
real Windows tests.

> Looking at recent bugs, it seems like a couple of other people (Hugh
> Davenport [5], Hanno Boeck [6]) have also been looking at
> sanitizer-related things.

  Yes, I also get Coverity Scan reports about it.

> So I wondered if the master libxml2 repo already has a continuous
> build pointed at it (the Gnome continuous build system [7], maybe?),

  No not that know of

> and, if so, whether it might be a good idea to turn on various
> analysis tools to help catch future problems.
>
> Thoughts?

  Sure, the rate of changes is fairly slow though:
https://git.gnome.org/browse/libxml2/

But getting a report if something breaks on commit there would be appreciated
as long as there is some logic to avoid pestering the list repeatedly with
the same issue. That was a very painful experience on the very early versions
of Coverity for example,

Daniel

> 
> Thanks,
> David
> 
> [1] https://github.com/daviddrysdale/libxml2
> [2] https://travis-ci.org/daviddrysdale/libxml2
> [3] https://github.com/daviddrysdale/libxml2/commits/test
> [4] https://coveralls.io/github/daviddrysdale/libxml2
> [5] https://bugzilla.gnome.org/show_bug.cgi?id=756372
> [6] https://bugzilla.gnome.org/show_bug.cgi?id=752191
> [7] http://build.gnome.org/
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[xml] Continuous integration for libxml2?

2015-10-16 Thread David Drysdale 
Hi folks,

Does libxml2 have a continuous integration system running over it somewhere?

I've recently been exploring continuous integration systems and I used
libxml2 as a guinea pig for getting various tools working in
combination.  Specifically, I've got a GitHub clone [1] of the repo
that links in with Travis [2]; once I added a few small local fixes
[3], I got the tests running on {gcc,clang} x {linux,osx} plus ASAN,
UBSAN and coverage [4] runs.

Looking at recent bugs, it seems like a couple of other people (Hugh
Davenport [5], Hanno Boeck [6]) have also been looking at
sanitizer-related things.

So I wondered if the master libxml2 repo already has a continuous
build pointed at it (the Gnome continuous build system [7], maybe?),
and, if so, whether it might be a good idea to turn on various
analysis tools to help catch future problems.

Thoughts?

Thanks,
David

[1] https://github.com/daviddrysdale/libxml2
[2] https://travis-ci.org/daviddrysdale/libxml2
[3] https://github.com/daviddrysdale/libxml2/commits/test
[4] https://coveralls.io/github/daviddrysdale/libxml2
[5] https://bugzilla.gnome.org/show_bug.cgi?id=756372
[6] https://bugzilla.gnome.org/show_bug.cgi?id=752191
[7] http://build.gnome.org/
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Re: [xml] [libxslt] GPL-licensed file being distributed with MIT-licensed libxslt

2015-10-16 Thread Daniel Veillard 
On Fri, Oct 16, 2015 at 04:53:08PM +0800, Daniel Veillard wrote:
> On Wed, Sep 16, 2015 at 11:11:53PM +0200, Nick Wellnhofer wrote:
> > On 16/09/2015 22:51, Mike Dalessio wrote:
> > >It appears as though the file
> > >
> > > libxslt-1.1.28/doc/tutorial2/libxslt_pipes.c
> > >
> > >is GPL licensed.
> > >
> > >This file is being distributed in the libxslt source tarball, which is at 
> > >odds
> > >with libxslt's MIT license.
> > 
> > The same goes for doc/tutorial/libxslt_tutorial.c which libxslt_pipes.c
> > claims to be based on. Both files are based on the MIT-licensed xsltproc.c
> > but there's nothing wrong with that.
> > 
> > >Any thoughts on what, if anything, should be done about it?
> > 
> > It's only part of the documentation, so I don't see a problem.
> 
>   Simplest is to find and ask the authors if they are fine relicencing
> those, hopefully they see no problem and I will fix this, I tried to contact
> them, let's see how it goes,

  So I reached to John Fleck and he's fine with this

  https://twitter.com/jfleck/status/655017833206714368

as well as Panos

: Date: Fri, 16 Oct 2015 13:43:45 +0300
: From: Panos Louridas 
: To: veill...@redhat.com
: Subject: Re: Licence of example in libxslt
: 
: Hi Daniel,
: 
: Yes, sure, no problem. What do you need from me to do this?
: 
: Cheers,
: 
: Panos.

  So I think we can remove the GPL header making the inherited MIT licence
kick in:

 
https://git.gnome.org/browse/libxslt/commit/?id=fd83a88ce3f68db599a3a2c8f018cbc66f9be19b

 so tell me how many hours of lawyer time were wasted on this issue ;-) ?

Daniel
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