Function load_stream_impl

external/pugixml/pugixml.cpp:3165–3194

#ifndef PUGIXML_NO_STL
	template <typename T> xml_parse_result load_stream_impl(xml_document& doc, std::basic_istream<T>& stream, unsigned int options, xml_encoding encoding)
	{
		// get length of remaining data in stream
		typename std::basic_istream<T>::pos_type pos = stream.tellg();
		stream.seekg(0, std::ios::end);
		std::streamoff length = stream.tellg() - pos;
		stream.seekg(pos);

		if (stream.fail() || pos < 0) return make_parse_result(status_io_error);

		// guard against huge files
		size_t read_length = static_cast<size_t>(length);

		if (static_cast<std::streamsize>(read_length) != length || length < 0) return make_parse_result(status_out_of_memory);

		// read stream data into memory (guard against stream exceptions with buffer holder)
		buffer_holder buffer(global_allocate((read_length > 0 ? read_length : 1) * sizeof(T)), global_deallocate);
		if (!buffer.data) return make_parse_result(status_out_of_memory);

		stream.read(static_cast<T*>(buffer.data), static_cast<std::streamsize>(read_length));

		// read may set failbit | eofbit in case gcount() is less than read_length (i.e. line ending conversion), so check for other I/O errors
		if (stream.bad()) return make_parse_result(status_io_error);

		// load data from buffer
		size_t actual_length = static_cast<size_t>(stream.gcount());
		assert(actual_length <= read_length);

		return doc.load_buffer_inplace_own(buffer.release(), actual_length * sizeof(T), options, encoding);
	}
#endif

#if defined(_MSC_VER) || defined(__BORLANDC__) || defined(__MINGW32__)