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/*
* Ouroboros - Copyright (C) 2016 - 2017
*
* Endianness
*
* Dimitri Staessens <dimitri.staessens@intec.ugent.be>
*
* This implementation is adapted and redistributed from the RHASH
* project
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
/*
* byte_order.h - byte order related platform dependent routines,
*
* Copyright: 2008-2012 Aleksey Kravchenko <rhash.admin@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. Use this program at your own risk!
*/
#ifndef OUROBOROS_ENDIAN_H
#define OUROBOROS_ENDIAN_H
#include <stdint.h>
#include <unistd.h>
#include <stdlib.h>
#ifdef __GLIBC__
#include <endian.h>
#elif defined(__FreeBSD__)
#include <sys/endian.h>
#endif
/* if x86 compatible cpu */
#if defined(i386) || defined(__i386__) || defined(__i486__) || \
defined(__i586__) || defined(__i686__) || defined(__pentium__) || \
defined(__pentiumpro__) || defined(__pentium4__) || \
defined(__nocona__) || defined(prescott) || defined(__core2__) || \
defined(__k6__) || defined(__k8__) || defined(__athlon__) || \
defined(__amd64) || defined(__amd64__) || \
defined(__x86_64) || defined(__x86_64__) || defined(_M_IX86) || \
defined(_M_AMD64) || defined(_M_IA64) || defined(_M_X64)
/* detect if x86-64 instruction set is supported */
# if defined(_LP64) || defined(__LP64__) || defined(__x86_64) || \
defined(__x86_64__) || defined(_M_AMD64) || defined(_M_X64)
# define CPU_X64
# else
# define CPU_IA32
# endif
#endif
/* detect CPU endianness */
#if (defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && \
__BYTE_ORDER == __LITTLE_ENDIAN) || \
defined(CPU_IA32) || defined(CPU_X64) || \
defined(__ia64) || defined(__ia64__) || defined(__alpha__) || \
defined(_M_ALPHA) || defined(vax) || defined(MIPSEL) || \
defined(_ARM_) || defined(__arm__)
#define CPU_LITTLE_ENDIAN
#define IS_BIG_ENDIAN 0
#define IS_LITTLE_ENDIAN 1
#elif (defined(__BYTE_ORDER) && defined(__BIG_ENDIAN) && \
__BYTE_ORDER == __BIG_ENDIAN) || \
defined(__sparc) || defined(__sparc__) || defined(sparc) || \
defined(_ARCH_PPC) || defined(_ARCH_PPC64) || defined(_POWER) || \
defined(__POWERPC__) || defined(POWERPC) || defined(__powerpc) || \
defined(__powerpc__) || defined(__powerpc64__) || defined(__ppc__) || \
defined(__hpux) || defined(_MIPSEB) || defined(mc68000) || \
defined(__s390__) || defined(__s390x__) || defined(sel)
#define CPU_BIG_ENDIAN
#define IS_BIG_ENDIAN 1
#define IS_LITTLE_ENDIAN 0
#else
# error "Can't detect CPU architecture."
#endif
#if defined(__GNUC__) && (__GNUC__ >= 4) && \
(__GNUC__ > 4 || __GNUC_MINOR__ >= 3)
/* for GCC >= 4.3 */
#define bswap_32(x) __builtin_bswap32(x)
#elif !defined(__STRICT_ANSI__)
/* general bswap_32 definition */
static inline uint32_t bswap_32(uint32_t x) {
x = ((x << 8) & 0xFF00FF00) | ((x >> 8) & 0x00FF00FF);
return (x >> 16) | (x << 16);
}
#else
#define bswap_32(x) ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
(((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
#endif /* bswap_32 */
#if defined(__GNUC__) && (__GNUC__ >= 4) && \
(__GNUC__ > 4 || __GNUC_MINOR__ >= 3)
#define bswap_64(x) __builtin_bswap64(x)
#elif !defined (bswap64)
#if !defined(__STRICT_ANSI__)
static inline uint64_t bswap_64(uint64_t x) {
union {
uint64_t ll;
uint32_t l[2];
} w, r;
w.ll = x;
r.l[0] = bswap_32(w.l[1]);
r.l[1] = bswap_32(w.l[0]);
return r.ll;
}
#else
#error "bswap_64 unsupported"
#endif
#endif
#ifdef CPU_LITTLE_ENDIAN
#define hton64(x) bswap_64(x)
#define hton32(x) bswap_32(x)
#define ntoh64(x) bswap_64(x)
#define ntoh32(x) bswap_32(x)
#else /* CPU_LITTLE_ENDIAN */
#define hton64(x) (x)
#define hton32(x) (x)
#define ntoh64(x) (x)
#define noth32(x) (x)
#endif /* CPU_LITTLE_ENDIAN */
#endif /* OUROBOROS_ENDIAN_H */
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