ArrayIndexOutOfBound Problem in EncodingDetect utf16_probability

[barryzhan2017]

In line 736 to 739, the if statement:
if (rawtext.length > 1 && ((byte) 0xFE == rawtext[0] && (byte) 0xFF == rawtext[1]) || ((byte) 0xFF == rawtext[0] && (byte) 0xFE == rawtext[1]))
It can potentially cause ArrayIndexOutOfBound When rawtext.length <= 1 and gets to (byte) 0xFF == rawtext[0] && (byte) 0xFE == rawtext[1])