[xml] Proper usage of xmlSaveToBuffer

[Alex Suzuki <as cynox ch>]

Hi,

I'm having a little trouble using xmlSaveToBuffer. What I want is to  
dump a document to an in-memory xmlBuffer, like this:

  xmlBufferPtr buf = xmlBufferCreate();
  xmlSaveCtxtPtr saveCtxt = xmlSaveToBuffer(buf, m_encoding,  
XML_SAVE_FORMAT | XML_SAVE_NO_EMPTY);
  xmlSaveDoc(saveCtxt, doc);

However, buf remains empty. Stepping through the code shows that  
xmlSaveToBuffer creates an xmlOutputBufer via xmlOutputBufferCreate,  
which in turn uses xmlOutputBufferCreateIO with the passed xmlBuffer  
as context.
However, when the actual xmlOutputBuffer is created, it seems to  
create its own xmlBuffer (in xmlAllocOutputBufferInternal), which is  
used for subsequent write calls.

Probably I misunderstood something. Can someone tell me what I'm doing  
wrong here?

Kind Regards,
  Alex

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