commit 0d1398b27f446b2f05ed7eeb51e6295a46b6de65
Author: Olli Pottonen <olli pottonen iki fi>
Date:   Sat Jun 13 16:42:31 2015 +1000

    Add missing part of encoding detection (XML 1.0 REC appendix F, UTF-32)

diff --git a/encoding.c b/encoding.c
index 6807306..3f89fd2 100644
--- a/encoding.c
+++ b/encoding.c
@@ -932,6 +932,12 @@ xmlDetectCharEncoding(const unsigned char* in, int len)
 	if ((in[0] == 0x3C) && (in[1] == 0x00) &&
 	    (in[2] == 0x00) && (in[3] == 0x00))
 	    return(XML_CHAR_ENCODING_UCS4LE);
+	if ((in[0] == 0xFF) && (in[1] == 0xFE) &&
+	    (in[2] == 0x00) && (in[3] == 0x00))
+	    return(XML_CHAR_ENCODING_UCS4LE);
+	if ((in[0] == 0x00) && (in[1] == 0x00) &&
+	    (in[2] == 0xFE) && (in[3] == 0xFF))
+	    return(XML_CHAR_ENCODING_UCS4BE);
 	if ((in[0] == 0x00) && (in[1] == 0x00) &&
 	    (in[2] == 0x3C) && (in[3] == 0x00))
 	    return(XML_CHAR_ENCODING_UCS4_2143);