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/*
* Copyright (C) 2006-2009 Vincent Hanquez <tab@snarc.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* SHA implementation low level operation
*/
#ifndef BITFN_H
#define BITFN_H
#include <stdint.h>
// NOTE: Required to build on OpenBSD
#undef swap32
#undef swap64
static inline unsigned int rol32(unsigned int word, unsigned int shift)
{
return (word << shift) | (word >> (32 - shift));
}
static inline unsigned int ror32(unsigned int word, unsigned int shift)
{
return (word >> shift) | (word << (32 - shift));
}
static inline uint64_t rol64(uint64_t word, unsigned int shift)
{
return (word << shift) | (word >> (64 - shift));
}
static inline uint64_t ror64(uint64_t word, unsigned int shift)
{
return (word >> shift) | (word << (64 - shift));
}
#if (defined(__i386__) || defined(__x86_64__)) && !defined(NO_INLINE_ASM)
static inline unsigned int swap32(unsigned int a)
{
asm ("bswap %0" : "=r" (a) : "0" (a));
return a;
}
#else
static inline unsigned int swap32(unsigned int a)
{
return (a << 24) | ((a & 0xff00) << 8) | ((a >> 8) & 0xff00) | (a >> 24);
}
#endif
#if defined(__x86_64__) && !defined(NO_INLINE_ASM)
static inline uint64_t swap64(uint64_t a)
{
asm ("bswap %0" : "=r" (a) : "0" (a));
return a;
}
#else
static inline uint64_t swap64(uint64_t a)
{
return ((uint64_t) swap32((unsigned int) (a >> 32))) |
(((uint64_t) swap32((unsigned int) a)) << 32);
}
#endif
/* big endian to cpu */
#ifdef __APPLE__
#include <architecture/byte_order.h>
#elif defined(__FreeBSD__)
#include <sys/endian.h>
#elif _WIN32
/* nothing */
#else
#include <endian.h>
#endif
#if LITTLE_ENDIAN == BYTE_ORDER
#define be32_to_cpu(a) swap32(a)
#define cpu_to_be32(a) swap32(a)
#define be64_to_cpu(a) swap64(a)
#define cpu_to_be64(a) swap64(a)
#elif BIG_ENDIAN == BYTE_ORDER
#define be32_to_cpu(a) (a)
#define cpu_to_be32(a) (a)
#define be64_to_cpu(a) (a)
#define cpu_to_be64(a) (a)
#else
#error "endian not supported"
#endif
#endif /* !BITFN_H */
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