linux/lib/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
  33
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