Function xml_encoding get_buffer_encoding

src/pugiXML/pugixml.cpp:1132–1155

	}

	PUGI__FN xml_encoding get_buffer_encoding(xml_encoding encoding, const void* contents, size_t size)
	{
		// replace wchar encoding with utf implementation
		if (encoding == encoding_wchar) return get_wchar_encoding();

		// replace utf16 encoding with utf16 with specific endianness
		if (encoding == encoding_utf16) return is_little_endian() ? encoding_utf16_le : encoding_utf16_be;

		// replace utf32 encoding with utf32 with specific endianness
		if (encoding == encoding_utf32) return is_little_endian() ? encoding_utf32_le : encoding_utf32_be;

		// only do autodetection if no explicit encoding is requested
		if (encoding != encoding_auto) return encoding;

		// skip encoding autodetection if input buffer is too small
		if (size < 4) return encoding_utf8;

		// try to guess encoding (based on XML specification, Appendix F.1)
		const uint8_t* data = static_cast<const uint8_t*>(contents);

		PUGI__DMC_VOLATILE uint8_t d0 = data[0], d1 = data[1], d2 = data[2], d3 = data[3];

		return guess_buffer_encoding(d0, d1, d2, d3);
	}

	PUGI__FN bool get_mutable_buffer(char_t*& out_buffer, size_t& out_length, const void* contents, size_t size, bool is_mutable)
	{