K 10
svn:author
V 4
tijl
K 8
svn:date
V 27
2015-05-24T15:47:06.468302Z
K 7
svn:log
V 278
When only 2 bytes can be read from a 4 byte UTF-16 character in a base64
encoded chunk of a UTF-7 string, treat that as an incomplete character and
return an error instead of a shift sequence and no error.

Also check that the low 2 bytes have a valid value.

MFC after:	1 week

END