Class CrcRegister

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Holds the intermediate state of the CRC algorithm.

Instance Methods

__init__(self, crcAlgorithm, value=None)

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__str__(self)

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reset(self)
Reset the state of the register with the default seed value.

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takeBit(self, bit)
Process a single input bit.

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takeWord(self, word, width=8)
Process a binary input word.

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takeString(self, s)
Process a string as input.

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getValue(self)
Return the current value of the register as an integer.

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getFinalValue(self)
Return the current value of the register as an integer with xorMask applied.

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Method Details

init(self, crcAlgorithm, value=None)
(Constructor)

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Parameters:

crcAlgorithm (CrcAlgorithm) - The CRC algorithm to use.
value (an integer) - The initial register value to use. The result previous of a previous CRC calculation, can be used here to continue calculation with more data. If this parameter is None or not given, the register will be initialized with algorithm's default seed value.

takeWord(self, word, width=8)

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Process a binary input word.

Parameters:

word (an integer) - The input word. Since this can be a Python long, there is no coded limit to the number of bits the word can represent.
width (an integer) - The number of bits word represents.

takeString(self, s)

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Process a string as input. It is handled as a sequence of 8-bit integers.

getFinalValue(self)

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Return the current value of the register as an integer with xorMask applied. This can be used after all input data is processed to obtain the final result.

Class CrcRegister

__init__(self, crcAlgorithm, value=None) (Constructor)

takeWord(self, word, width=8)

takeString(self, s)

getFinalValue(self)

init(self, crcAlgorithm, value=None)
(Constructor)