[issue2857] add codec for java modified utf-8

[paul rubin]

paul rubin <phr at users.sourceforge.net> added the comment:

Some java applications use it externally.  The purpose seems to be to
prevent NUL bytes from appearing inside encoded strings which can
confuse C libraries that expect NUL's to terminate strings.  My
immediate application is parsing lucene indexes:

http://lucene.apache.org/java/docs/fileformats.html#Chars

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