merlin b89
solaris9 b51/sun4u
locale gb18030

reproduce as fellow:
#native2ascii GB18030_4.txt 1.txt.utf8
#native2ascii -reverse 1.txt.utf8 2.txt

Then there will get fellow error:
java.lang.ArrayIndexOutOfBoundsException

Attachment is text which include some 4-byte char for chinese gb18030 locale.