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endianness.h
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endianness.h
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/*******************************************************************************
* Copyright (c) 2008-2016 by Gillen Daniel <gillen.dan@pinguin.lu> *
* *
* This program is free software: you can redistribute it and/or modify it *
* under the terms of the GNU General Public License as published by the Free *
* Software Foundation, either version 3 of the License, or (at your option) *
* any later version. *
* *
* 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. See the GNU General Public License for *
* more details. *
* *
* You should have received a copy of the GNU General Public License along with *
* this program. If not, see <http://www.gnu.org/licenses/>. *
*******************************************************************************/
/*
* This file aims at making endianness conversions using the following
* functions portable.
*
* Conversion from big endian to host / from host to big endian
* be16toh(uint16_t)
* be32toh(uint32_t)
* be64toh(uint64_t)
* htobe16(uint16_t)
* htobe32(uint32_t)
* htobe64(uint64_t)
*
* Conversion from little endian to host / from host to little endian
* le16toh(uint16_t)
* le32toh(uint32_t)
* le64toh(uint64_t)
* htole16(uint16_t)
* htole32(uint32_t)
* htole64(uint64_t)
*
* In addition, including this file will define HOST_BYTEORDER_IS_BE or
* HOST_BYTEORDER_IS_LE according to the current byte order of the host.
*/
#ifndef ENDIANNESS_H
#define ENDIANNESS_H
#include <config.h>
#ifdef HAVE_STDINT_H
#include <stdint.h>
#else
#error "Including this file requires you to have stdint.h"
#endif
#ifdef HAVE_ENDIAN_H
#include <endian.h>
#endif
// First we need to have the bswap functions
#if defined(HAVE_BYTESWAP_H)
#include <byteswap.h>
#elif defined(__APPLE__) && defined(HAVE_LIBKERN_OSBYTEORDER_H)
#include <libkern/OSByteOrder.h>
#define bswap_16 OSSwapInt16
#define bswap_32 OSSwapInt32
#define bswap_64 OSSwapInt64
#else
#define bswap_16(value) { \
((((value) & 0xff) << 8) | ((value) >> 8)) \
}
#define bswap_32(value) { \
(((uint32_t)bswap_16((uint16_t)((value) & 0xffff)) << 16) | \
(uint32_t)bswap_16((uint16_t)((value) >> 16))) \
}
#define bswap_64(value) { \
(((uint64_t)bswap_32((uint32_t)((value) & 0xffffffff)) << 32) | \
(uint64_t)bswap_32((uint32_t)((value) >> 32))) \
}
#endif
// Next we need to know what endianness is used
#if defined(__LITTLE_ENDIAN__)
#define HOST_BYTEORDER_IS_LE
#elif defined(__BIG_ENDIAN__)
#define HOST_BYTEORDER_IS_BE
#elif defined(__BYTE_ORDER)
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define HOST_BYTEORDER_IS_LE
#else
#define HOST_BYTEORDER_IS_BE
#endif
#elif defined(__BYTE_ORDER__)
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define HOST_BYTEORDER_IS_LE
#else
#define HOST_BYTEORDER_IS_BE
#endif
#else
#error "Unable to determine host byteorder"
#endif
// And finally we can define the endianness conversion macros
#ifdef HOST_BYTEORDER_IS_LE
#ifndef be16toh
#define be16toh(x) bswap_16(x)
#endif
#ifndef htobe16
#define htobe16(x) bswap_16(x)
#endif
#ifndef be32toh
#define be32toh(x) bswap_32(x)
#endif
#ifndef htobe32
#define htobe32(x) bswap_32(x)
#endif
#ifndef be64toh
#define be64toh(x) bswap_64(x)
#endif
#ifndef htobe64
#define htobe64(x) bswap_64(x)
#endif
#ifndef le16toh
#define le16toh(x) (x)
#endif
#ifndef htole16
#define htole16(x) (x)
#endif
#ifndef le32toh
#define le32toh(x) (x)
#endif
#ifndef htole32
#define htole32(x) (x)
#endif
#ifndef le64toh
#define le64toh(x) (x)
#endif
#ifndef htole64
#define htole64(x) (x)
#endif
#else
#ifndef be16toh
#define be16toh(x) (x)
#endif
#ifndef htobe16
#define htobe16(x) (x)
#endif
#ifndef be32toh
#define be32toh(x) (x)
#endif
#ifndef htobe32
#define htobe32(x) (x)
#endif
#ifndef be64toh
#define be64toh(x) (x)
#endif
#ifndef htobe64
#define htobe64(x) (x)
#endif
#ifndef le16toh
#define le16toh(x) bswap_16(x)
#endif
#ifndef htole16
#define htole16(x) bswap_16(x)
#endif
#ifndef le32toh
#define le32toh(x) bswap_32(x)
#endif
#ifndef htole32
#define htole32(x) bswap_32(x)
#endif
#ifndef le64toh
#define le64toh(x) bswap_64(x)
#endif
#ifndef htole64
#define htole64(x) bswap_64(x)
#endif
#endif
#endif //ENDIANNESS_H

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