File: byteops.c

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#define _GNU_SOURCE
#include <stdbool.h>
#include <stdint.h>
#include <string.h>

/*===========================================================================*/
uint32_t rotl32(uint32_t a, uint32_t n)
{
return((a << n) | (a >> (32 - n)));
}
/*===========================================================================*/
uint64_t rotl64(uint64_t a, uint64_t n)
{
return ((a << n) | (a >> (64 - n)));
}
/*===========================================================================*/
uint32_t rotr32(uint32_t a, uint32_t n)
{
return ((a >> n) | (a << (32 - n)));
}
/*===========================================================================*/
uint64_t rotr64(uint64_t a, uint64_t n)
{
return ((a >> n) | (a << (64 - n)));
}
/*===========================================================================*/
uint16_t byte_swap_8(uint8_t n)
{
return (n & 0xf0) >> 4 | (n & 0x0f) << 4;
}
/*===========================================================================*/
uint16_t byte_swap_16(uint16_t n)
{
return (n & 0xff00) >> 8 | (n & 0x00ff) << 8;
}
/*===========================================================================*/
uint32_t byte_swap_32(uint32_t n)
{
#if defined (__clang__) || defined (__GNUC__)
return __builtin_bswap32 (n);
#else
return(n & 0xff000000) >> 24 | (n & 0x00ff0000) >> 8
      | (n & 0x0000ff00) << 8 | (n & 0x000000ff) << 24;
#endif
}
/*===========================================================================*/
uint64_t byte_swap_64(uint64_t n)
{
#if defined (__clang__) || defined (__GNUC__)
return __builtin_bswap64 (n);
#else
return (n & 0xff00000000000000ULL) >> 56
       | (n & 0x00ff000000000000ULL) >> 40
       | (n & 0x0000ff0000000000ULL) >> 24
       | (n & 0x000000ff00000000ULL) >>  8
       | (n & 0x00000000ff000000ULL) <<  8
       | (n & 0x0000000000ff0000ULL) << 24
       | (n & 0x000000000000ff00ULL) << 40
       | (n & 0x00000000000000ffULL) << 56;
#endif
}
/*===========================================================================*/