[libxml-devel] [ libxml-Bugs-21546 ] SaxParser Crashes -- Null Pointer

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Bugs item #21546, was opened at 2008-08-12 19:26
You can respond by visiting: 
http://rubyforge.org/tracker/?func=detail&atid=1971&aid=21546&group_id=494

Category: General
Group: None
Status: Open
Resolution: None
Priority: 3
Submitted By: Nick Retallack (nickretallack)
Assigned to: Nobody (None)
Summary: SaxParser Crashes -- Null Pointer

Initial Comment:
Any xml document that contains a DTD causes SaxParser to crash.

Example:
  require 'rubygems'
  require 'libxml'
  
  class Handler
    def method_missing(method_name, *attributes, &block); end
  end
  
  parser = LibXML::XML::SaxParser.new
  parser.filename = 'anything_with_a_dtd.xml'
  parser.callbacks = Handler.new
  puts parser.filename
  parser.parse

result:
  saxmltest.rb:12:in `parse': NULL pointer given (ArgumentError)


It seems I am not the only person having this problem.
http://rubyforge.org/pipermail/libxml-devel/2008-July/001042.html

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>Comment By: Charlie Savage (cfis)
Date: 2008-11-15 18:14

Message:
Hi Nick,

I think I've got this fixed - will be in the next release.  Thanks for the report.

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Comment By: Andy Hauser (buggs)
Date: 2008-08-26 12:41

Message:
This bug is whitespace sensitive. Your test_doctype with the inline document does not start with an XML declaration, so it does not get triggered. Remove the whitespace before it and the bug appears. It seems otherwise it's not even parsing the data.

Here is complete program showing the bug:

require 'libxml'
class DocTypeCallback
   include LibXML::XML::SaxParser::Callbacks
   def on_start_element(element, attributes)
     puts element
   end
end

def test_doctype
  xp = LibXML::XML::SaxParser.new
  xp.callbacks = DocTypeCallback.new
  xp.string = <<-EOS
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE Results SYSTEM "results.dtd">
<Results>
  <a>a1</a>
</Results>
EOS

  doc = xp.parse
end

test_doctype


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Comment By: Charlie Savage (cfis)
Date: 2008-08-20 02:29

Message:
Does the tc_sax_parser#test_doctype test work for you?  That's copied directly from the link you mention, and works fine here.  Does it work for you?

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You can respond by visiting: 
http://rubyforge.org/tracker/?func=detail&atid=1971&aid=21546&group_id=494