blob: 27414d2d05ff69d9d7252b46ba2b201f96e62fd9 [file] [log] [blame]
 /* * There are multiple 16-bit CRC polynomials in common use, but this is * *the* standard CRC-32 polynomial, first popularized by Ethernet. * 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 */ #define CRCPOLY_LE 0xedb88320 #define CRCPOLY_BE 0x04c11db7 /* How many bits at a time to use. Requires a table of 4< 8 || CRC_LE_BITS < 1 || CRC_LE_BITS & CRC_LE_BITS-1 # error CRC_LE_BITS must be a power of 2 between 1 and 8 #endif /* * Big-endian CRC computation. Used with serial bit streams sent * msbit-first. Be sure to use cpu_to_be32() to append the computed CRC. */ #if CRC_BE_BITS > 8 || CRC_BE_BITS < 1 || CRC_BE_BITS & CRC_BE_BITS-1 # error CRC_BE_BITS must be a power of 2 between 1 and 8 #endif #define ___constant_swab32(x) \ ((__u32)( \ (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ (((__u32)(x) & (__u32)0xff000000UL) >> 24) )) #ifdef WORDS_BIGENDIAN #define __constant_cpu_to_le32(x) ___constant_swab32((x)) #define __constant_cpu_to_be32(x) (x) #define __be32_to_cpu(x) (x) #define __cpu_to_be32(x) (x) #define __cpu_to_le32(x) (ext2fs_swab32((x))) #define __le32_to_cpu(x) (ext2fs_swab32((x))) #else #define __constant_cpu_to_le32(x) (x) #define __constant_cpu_to_be32(x) ___constant_swab32((x)) #define __be32_to_cpu(x) (ext2fs_swab32((x))) #define __cpu_to_be32(x) (ext2fs_swab32((x))) #define __cpu_to_le32(x) (x) #define __le32_to_cpu(x) (x) #endif #if (__GNUC__ >= 3) #define likely(x) __builtin_expect(!!(x), 1) #define unlikely(x) __builtin_expect(!!(x), 0) #else #define likely(x) (x) #define unlikely(x) (x) #endif