107 lines
2.4 KiB
C
107 lines
2.4 KiB
C
/**
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* \file
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* Functions and types for CRC checks.
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*
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* Generated on Sat May 12 09:41:12 2018
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* by pycrc v0.9.1, https://pycrc.org
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* using the configuration:
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* - Width = 4
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* - Poly = 0x3
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* - XorIn = 0x0
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* - ReflectIn = False
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* - XorOut = 0x0
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* - ReflectOut = False
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* - Algorithm = table-driven
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*
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* This file defines the functions crc4itu_init(), crc4itu_update() and crc_finalize().
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*
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* The crc4itu_init() function returns the initial \c crc value and must be called
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* before the first call to crc4itu_update().
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* Similarly, the crc_finalize() function must be called after the last call
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* to crc4itu_update(), before the \c crc is being used.
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* is being used.
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*
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* The crc4itu_update() function can be called any number of times (including zero
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* times) in between the crc4itu_init() and crc_finalize() calls.
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*
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* This pseudo-code shows an example usage of the API:
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* \code{.c}
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* crc_t crc;
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* unsigned char data[MAX_DATA_LEN];
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* size_t data_len;
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*
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* crc = crc4itu_init();
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* while ((data_len = read_data(data, MAX_DATA_LEN)) > 0) {
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* crc = crc4itu_update(crc, data, data_len);
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* }
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* crc = crc_finalize(crc);
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* \endcode
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*/
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#ifndef CRC4ITU_H
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#define CRC4ITU_H
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#include <stdlib.h>
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* The definition of the used algorithm.
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*
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* This is not used anywhere in the generated code, but it may be used by the
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* application code to call algorithm-specific code, if desired.
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*/
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#define CRC_ALGO_TABLE_DRIVEN 1
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/**
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* The type of the CRC values.
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*
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* This type must be big enough to contain at least 4 bits.
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*/
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typedef uint_fast8_t crc_t;
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/**
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* Calculate the initial crc value.
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*
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* \return The initial crc value.
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*/
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static inline crc_t crc4itu_init(void)
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{
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return 0x0;
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}
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/**
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* Update the crc value with new data.
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*
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* \param[in] crc The current crc value.
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* \param[in] data Pointer to a buffer of \a data_len bytes.
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* \param[in] data_len Number of bytes in the \a data buffer.
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* \return The updated crc value.
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*/
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crc_t crc4itu_update(crc_t crc, const void *data, size_t data_len);
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/**
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* Calculate the final crc value.
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*
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* \param[in] crc The current crc value.
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* \return The final crc value.
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*/
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static inline crc_t crc_finalize(crc_t crc)
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{
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return crc;
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}
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#ifdef __cplusplus
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} /* closing brace for extern "C" */
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#endif
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#endif /* CRC4ITU_H */
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