/** * \file crc32.h * Functions and types for CRC checks. * * Generated on Mon Feb 21 23:03:39 2011, * by pycrc v0.7.1, http://www.tty1.net/pycrc/ * using the configuration: * Width = 32 * Poly = 0x04c11db7 * XorIn = 0xffffffff * ReflectIn = True * XorOut = 0xffffffff * ReflectOut = True * Algorithm = bit-by-bit-fast * Direct = True *****************************************************************************/ #ifndef __CRC___H__ #define __CRC___H__ #include #include #ifdef __cplusplus extern "C" { #endif /** * The definition of the used algorithm. *****************************************************************************/ #define CRC_ALGO_BIT_BY_BIT_FAST 1 /** * The type of the CRC values. * * This type must be big enough to contain at least 32 bits. *****************************************************************************/ /** * Reflect all bits of a \a data word of \a data_len bytes. * * \param data The data word to be reflected. * \param data_len The width of \a data expressed in number of bits. * \return The reflected data. *****************************************************************************/ uint32_t crc_reflect( uint32_t data, size_t data_len ); /** * Calculate the initial crc value. * * \return The initial crc value. *****************************************************************************/ static inline uint32_t crc_init( void ) { return 0xffffffff; } /** * Update the crc value with new data. * * \param crc The current crc value. * \param data Pointer to a buffer of \a data_len bytes. * \param data_len Number of bytes in the \a data buffer. * \return The updated crc value. *****************************************************************************/ uint32_t crc32_update( uint32_t crc, const unsigned char data ); /** * Calculate the final crc value. * * \param crc The current crc value. * \return The final crc value. *****************************************************************************/ static inline uint32_t crc_finalize( uint32_t crc ) { return crc_reflect( crc, 32 ) ^ 0xffffffff; } #ifdef __cplusplus } /* closing brace for extern "C" */ #endif #endif /* __CRC___H__ */