Function convert_buffer_utf16

external/pugixml/pugixml.cpp:1123–1143

	}

	template <typename opt_swap> bool convert_buffer_utf16(char_t*& out_buffer, size_t& out_length, const void* contents, size_t size, opt_swap)
	{
		const uint16_t* data = static_cast<const uint16_t*>(contents);
		size_t length = size / sizeof(uint16_t);

		// first pass: get length in wchar_t units
		out_length = utf_decoder<wchar_counter, opt_swap>::decode_utf16_block(data, length, 0);

		// allocate buffer of suitable length
		out_buffer = static_cast<char_t*>(global_allocate((out_length > 0 ? out_length : 1) * sizeof(char_t)));
		if (!out_buffer) return false;

		// second pass: convert utf16 input to wchar_t
		wchar_writer::value_type out_begin = reinterpret_cast<wchar_writer::value_type>(out_buffer);
		wchar_writer::value_type out_end = utf_decoder<wchar_writer, opt_swap>::decode_utf16_block(data, length, out_begin);

		assert(out_end == out_begin + out_length);
		(void)!out_end;

		return true;
	}

	template <typename opt_swap> bool convert_buffer_utf32(char_t*& out_buffer, size_t& out_length, const void* contents, size_t size, opt_swap)
	{