decode() of EUC_TW.Decoder and DoubleByteDecoder return CoderResult for unmappable double byte character with wrong "length" value. See test case
below.

import java.nio.charset.*;
import java.nio.*;

public class TestUnmappableForLength {
    public static void main(String[] argv) throws CharacterCodingException {
            byte[] ba = {(byte)0xa2, (byte)0xff};
            //EUC_TW has its own decodeArrayLoop()
testDecode("EUC_TW", ba, 2);

            //EUC_CN uses DoubleByteDecoder's decodeArrayLoop()
            testDecode("EUC_CN", ba, 2);
    }

    static void testDecode(String csName, byte[] ba, int expected)
throws CharacterCodingException
    {
        try {
            CoderResult cr = Charset
.forName(csName)
.newDecoder()
.decode(ByteBuffer.wrap(ba), CharBuffer.allocate(4), true);
            if (cr.isUnmappable() && cr.length() != expected) {
throw new CharacterCodingException();
            }
} catch (IllegalArgumentException x){
x.printStackTrace();
}
    }

}

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