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Diffstat (limited to 'include/ouroboros/endian.h')
| -rw-r--r-- | include/ouroboros/endian.h | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/include/ouroboros/endian.h b/include/ouroboros/endian.h new file mode 100644 index 00000000..745f0c57 --- /dev/null +++ b/include/ouroboros/endian.h @@ -0,0 +1,146 @@ +/* + * 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 */ |