Add length check when work with Feitian OEM R502 #606
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improve the code, to have compatible with OEM R502 firmware.
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improve the code, to have compatible with OEM R502.
In the PC/SC reader, the response code has two bytes, SW1 and SW2, but some Feitian reader with OEM firmware, which only return 1 byte, which lead the problem at high level API call. add length check and avoid this problem.