Summary

Correct the behavior of UnicodeDecoder subclasses on handling U+FFFE code point in the middle of the input buffer.

Problem

Currently UnicodeDecoder deals with U+FFFE in the middle of a string as "malformed" as it is a non-character. This has been correct up until Unicode 7. However Unicode 7 includes the corrigendum (http://www.unicode.org/versions/corrigendum9.html) that changed the definition of non-characters. UnicodeDecoder's behavior should be modified to conform to it.

Solution

Remove the piece of code in UnicodeDecoder which detects the code point in the middle and return "malformed" CodeResult, so that the UTF16 decoders (StandardCharsets.UTF_16[LE/BE]) can pass through the code point.

Specification

As required by the Unicode 7 Corrigendum 9, U+FFFE is passed through as a code point.