[issue33578] cjkcodecs missing getstate and setstate implementations

[INADA Naoki]

INADA Naoki <songofacandy at gmail.com> added the comment:

ISO-2022-* is "stateful" encoding.  It uses escape sequence to change state.
So keeping only `pending` is not enough.

>>> enc.encode("abcあいう")
b'abc\x1b$B$"$$$&'
>>> enc.getstate()
0
>>> enc.encode("abc")
b'\x1b(Babc'

>>> enc.encode("abcあいう")
b'abc\x1b$B$"$$$&'
>>> enc.getstate()
0
>>> enc.setstate(0)
>>> enc.encode("abc")
b'abc'

I don't know much about other encodings.

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nosy: +inada.naoki

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<https://bugs.python.org/issue33578>
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