crc_16_dnp_tbl4bit.h

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/**
 * \file
 * Functions and types for CRC checks.
 *
 * Generated on Mon Aug 24 06:27:49 2020
 * by pycrc v0.9.2, https://pycrc.org
 * using the configuration:
 *  - Width         = 16
 *  - Poly          = 0x3d65
 *  - XorIn         = 0x0000
 *  - ReflectIn     = True
 *  - XorOut        = 0xffff
 *  - ReflectOut    = True
 *  - Algorithm     = table-driven
 *
 * This file defines the functions crc_16_dnp_tbl4bit_init(),
 * crc_16_dnp_tbl4bit_update() and crc_16_dnp_tbl4bit_finalize().
 *
 * The crc_16_dnp_tbl4bit_init() function returns the inital \c crc value and
 * must be called before the first call to crc_16_dnp_tbl4bit_update().
 * Similarly, the crc_16_dnp_tbl4bit_finalize() function must be called after
 * the last call to crc_16_dnp_tbl4bit_update(), before the \c crc is being
 * used. is being used.
 *
 * The crc_16_dnp_tbl4bit_update() function can be called any number of times
 * (including zero times) in between the crc_16_dnp_tbl4bit_init() and
 * crc_16_dnp_tbl4bit_finalize() calls.
 *
 * This pseudo-code shows an example usage of the API:
 * \code{.c}
 * crc_16_dnp_tbl4bit_t crc;
 * unsigned char data[MAX_DATA_LEN];
 * size_t data_len;
 *
 * crc = crc_16_dnp_tbl4bit_init();
 * while ((data_len = read_data(data, MAX_DATA_LEN)) > 0) {
 *     crc = crc_16_dnp_tbl4bit_update(crc, data, data_len);
 * }
 * crc = crc_16_dnp_tbl4bit_finalize(crc);
 * \endcode
 */
#ifndef CRC_16_DNP_TBL4BIT_H
#define CRC_16_DNP_TBL4BIT_H
 
#include <stdint.h>
#include <stdlib.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
/**
 * The definition of the used algorithm.
 *
 * This is not used anywhere in the generated code, but it may be used by the
 * application code to call algorithm-specific code, if desired.
 */
#define CRC_ALGO_TABLE_DRIVEN 1
 
/**
 * The type of the CRC values.
 *
 * This type must be big enough to contain at least 16 bits.
 */
typedef uint_fast16_t crc_16_dnp_tbl4bit_t;
 
/**
 * Calculate the initial crc value.
 *
 * \return     The initial crc value.
 */
static inline crc_16_dnp_tbl4bit_t crc_16_dnp_tbl4bit_init(void) {
  return 0x0000;
}
 
/**
 * Update the crc value with new data.
 *
 * \param[in] crc      The current crc value.
 * \param[in] data     Pointer to a buffer of \a data_len bytes.
 * \param[in] data_len Number of bytes in the \a data buffer.
 * \return             The updated crc value.
 */
crc_16_dnp_tbl4bit_t crc_16_dnp_tbl4bit_update(crc_16_dnp_tbl4bit_t crc,
                                               const void *data,
                                               size_t data_len);
 
/**
 * Calculate the final crc value.
 *
 * \param[in] crc  The current crc value.
 * \return     The final crc value.
 */
static inline crc_16_dnp_tbl4bit_t
crc_16_dnp_tbl4bit_finalize(crc_16_dnp_tbl4bit_t crc) {
  return crc ^ 0xffff;
}
 
#ifdef __cplusplus
} /* closing brace for extern "C" */
#endif
 
#endif /* CRC_16_DNP_TBL4BIT_H */