Limit reading CharBuffer.array() to CharBuffer.limit() to avoid additional NULL characters at the end of some inputs

[hannibal218bc]

It is not documented explicitly, but CharBuffer.array() "Returns the char array that backs this buffer", so the buffer may have excess space at the end that was not used for the input.

(See also the explanation why https://bugs.java.com/bugdatabase/view_bug.do?bug_id=6442955 is not a bug:

The Charset Buffer API is optimized for efficiency, not convenience. Buffer copies are avoided, but this means some buffers have extra elements between their limit and their capacity.

)

In a recent change to DataUtil the array() was passed without restricting its use to the length of limit(), hence adding NULL characters at the end.

Fixed by passing the value of limit() to the CharArrayReader that is actually reading from the array().

[jhy]

Thanks! Merged.