mirror of https://github.com/reiseburo/hermann
104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/**
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* \file rdcrc32.h
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* Functions and types for CRC checks.
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*
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* Generated on Tue May 8 17:36:59 2012,
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* by pycrc v0.7.10, http://www.tty1.net/pycrc/
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*
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* NOTE: Contains librd modifications:
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* - rd_crc32() helper.
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* - __RDCRC32___H__ define (was missing the '32' part).
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*
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* using the configuration:
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* Width = 32
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* Poly = 0x04c11db7
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* XorIn = 0xffffffff
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* ReflectIn = True
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* XorOut = 0xffffffff
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* ReflectOut = True
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* Algorithm = table-driven
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*****************************************************************************/
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#ifndef __RDCRC32___H__
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#define __RDCRC32___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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#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 32 bits.
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*****************************************************************************/
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typedef uint32_t rd_crc32_t;
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/**
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* Reflect all bits of a \a data word of \a data_len bytes.
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*
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* \param data The data word to be reflected.
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* \param data_len The width of \a data expressed in number of bits.
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* \return The reflected data.
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*****************************************************************************/
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rd_crc32_t rd_crc32_reflect(rd_crc32_t data, size_t data_len);
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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 rd_crc32_t rd_crc32_init(void)
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{
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return 0xffffffff;
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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 crc The current crc value.
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* \param data Pointer to a buffer of \a data_len bytes.
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* \param 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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rd_crc32_t rd_crc32_update(rd_crc32_t crc, const unsigned char *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 crc The current crc value.
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* \return The final crc value.
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*****************************************************************************/
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static inline rd_crc32_t rd_crc32_finalize(rd_crc32_t crc)
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{
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return crc ^ 0xffffffff;
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}
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/**
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* Wrapper for performing CRC32 on the provided buffer.
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*/
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static inline rd_crc32_t rd_crc32 (const char *data, size_t data_len) {
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return rd_crc32_finalize(rd_crc32_update(rd_crc32_init(),
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(const unsigned char *)data,
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data_len));
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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 /* __RDCRC32___H__ */
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