crc32defs.h

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    1 /*
    2  * There are multiple 16-bit CRC polynomials in common use, but this is
    3  * *the* standard CRC-32 polynomial, first popularized by Ethernet.
    4  * x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x^1+x^0
    5  */
    6 #define CRCPOLY_LE 0xedb88320
    7 #define CRCPOLY_BE 0x04c11db7
    8 
    9 /* How many bits at a time to use.  Requires a table of 4<<CRC_xx_BITS bytes. */
   10 /* For less performance-sensitive, use 4 */
   11 #ifndef CRC_LE_BITS 
   12 # define CRC_LE_BITS 8
   13 #endif
   14 #ifndef CRC_BE_BITS
   15 # define CRC_BE_BITS 8
   16 #endif
   17 
   18 /*
   19  * Little-endian CRC computation.  Used with serial bit streams sent
   20  * lsbit-first.  Be sure to use cpu_to_le32() to append the computed CRC.
   21  */
   22 #if CRC_LE_BITS > 8 || CRC_LE_BITS < 1 || CRC_LE_BITS & CRC_LE_BITS-1
   23 # error CRC_LE_BITS must be a power of 2 between 1 and 8
   24 #endif
   25 
   26 /*
   27  * Big-endian CRC computation.  Used with serial bit streams sent
   28  * msbit-first.  Be sure to use cpu_to_be32() to append the computed CRC.
   29  */
   30 #if CRC_BE_BITS > 8 || CRC_BE_BITS < 1 || CRC_BE_BITS & CRC_BE_BITS-1
   31 # error CRC_BE_BITS must be a power of 2 between 1 and 8
   32 #endif

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FreeBSD/Linux Kernel Cross Reference sys/lib/crc32defs.h

FreeBSD/Linux Kernel Cross Reference
sys/lib/crc32defs.h