Method append_buffer

lib/pugixml/src/pugixml.cpp:6144–6177

	}

	PUGI__FN xml_parse_result xml_node::append_buffer(const void* contents, size_t size, unsigned int options, xml_encoding encoding)
	{
		// append_buffer is only valid for elements/documents
		if (!impl::allow_insert_child(type(), node_element)) return impl::make_parse_result(status_append_invalid_root);

		// get document node
		impl::xml_document_struct* doc = &impl::get_document(_root);

		// disable document_buffer_order optimization since in a document with multiple buffers comparing buffer pointers does not make sense
		doc->header |= impl::xml_memory_page_contents_shared_mask;

		// get extra buffer element (we'll store the document fragment buffer there so that we can deallocate it later)
		impl::xml_memory_page* page = 0;
		impl::xml_extra_buffer* extra = static_cast<impl::xml_extra_buffer*>(doc->allocate_memory(sizeof(impl::xml_extra_buffer) + sizeof(void*), page));
		(void)page;

		if (!extra) return impl::make_parse_result(status_out_of_memory);

	#ifdef PUGIXML_COMPACT
		// align the memory block to a pointer boundary; this is required for compact mode where memory allocations are only 4b aligned
		// note that this requires up to sizeof(void*)-1 additional memory, which the allocation above takes into account
		extra = reinterpret_cast<impl::xml_extra_buffer*>((reinterpret_cast<uintptr_t>(extra) + (sizeof(void*) - 1)) & ~(sizeof(void*) - 1));
	#endif

		// add extra buffer to the list
		extra->buffer = 0;
		extra->next = doc->extra_buffers;
		doc->extra_buffers = extra;

		// name of the root has to be NULL before parsing - otherwise closing node mismatches will not be detected at the top level
		impl::name_null_sentry sentry(_root);

		return impl::load_buffer_impl(doc, _root, const_cast<void*>(contents), size, options, encoding, false, false, &extra->buffer);
	}

	PUGI__FN xml_node xml_node::find_child_by_attribute(const char_t* name_, const char_t* attr_name, const char_t* attr_value) const
	{