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/* vim: set expandtab ts=4 sw=4: */
/*
* You may redistribute this program 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/>.
*/
#ifndef Endian_H
#define Endian_H
#include <stdint.h>
#if defined(Endian_BIG) || defined(Endian_LITTLE)
// fallthrough
#elif defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && \
__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define Endian_LITTLE
#elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \
__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define Endian_BIG
#elif defined(__amd64__) || defined(__x86_64__) || defined(__AMD64__) || \
defined(_M_X64) || defined(__amd64) || defined(__i386__) || defined(__x86__) || \
defined(__X86__) || defined(_M_IX86) || defined(__i386) || defined(_MIPSEL) || \
defined(MIPSEL)
#define Endian_LITTLE
#elif defined(__SPU__) || defined(__powerpc64__) || defined(__ppc64__) || \
defined(__PPC64__) || defined(_ARCH_PPC64) || defined(__powerpc__) || \
defined(__ppc__) || defined(__PPC__) || defined(_ARCH_PPC) || \
defined(__sparcv9__) || defined(__sparcv9) || defined(__sparc_v8__) || \
defined(__sparc__) || defined(__sparc) || defined(_MIPSEB) || defined(MIPSEB)
#define Endian_BIG
#else
#error Unable to determine byte order of target machine, please specify -DEndian_BIG=1 or \
-DEndian_LITTLE=1
#endif
#if defined(Endian_LITTLE)
#define Endian_isBigEndian() 0
#elif defined(Endian_BIG)
#define Endian_isBigEndian() 1
#endif
#if defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 8
#define Endian_byteSwapNoCast16(x) __builtin_bswap16(x)
#else
#define Endian_byteSwapNoCast16(x) \
(__extension__ ({ \
uint16_t _x = (x); \
_x >> 8 | _x << 8; \
}))
#endif
#define Endian_byteSwapNoCast32(x) __builtin_bswap32(x)
#define Endian_byteSwapNoCast64(x) __builtin_bswap64(x)
// Make sure the size is right.
#define Endian_byteSwap16(x) ((uint16_t)Endian_byteSwapNoCast16(((uint16_t)(x))))
#define Endian_byteSwap32(x) ((uint32_t)Endian_byteSwapNoCast32(((uint32_t)(x))))
#define Endian_byteSwap64(x) ((uint64_t)Endian_byteSwapNoCast64(((uint64_t)(x))))
#if defined(Endian_BIG)
#define Endian_hostToLittleEndian16(input) Endian_byteSwap16(input)
#define Endian_hostToBigEndian16(input) (input)
#define Endian_hostToLittleEndian32(input) Endian_byteSwap32(input)
#define Endian_hostToBigEndian32(input) (input)
#define Endian_hostToLittleEndian64(input) Endian_byteSwap64(input)
#define Endian_hostToBigEndian64(input) (input)
#elif defined(Endian_LITTLE)
#define Endian_hostToLittleEndian16(input) (input)
#define Endian_hostToBigEndian16(input) Endian_byteSwap16(input)
#define Endian_hostToLittleEndian32(input) (input)
#define Endian_hostToBigEndian32(input) Endian_byteSwap32(input)
#define Endian_hostToLittleEndian64(input) (input)
#define Endian_hostToBigEndian64(input) Endian_byteSwap64(input)
#endif
// looks silly but some macros want to be able to do generic swapping for any common int type.
#define Endian_littleEndianToHost8(x) (x)
#define Endian_bigEndianToHost8(x) (x)
#define Endian_hostToLittleEndian8(x) (x)
#define Endian_hostToBigEndian8(x) (x)
#define Endian_littleEndianToHost16(x) Endian_hostToLittleEndian16(x)
#define Endian_bigEndianToHost16(x) Endian_hostToBigEndian16(x)
#define Endian_littleEndianToHost32(x) Endian_hostToLittleEndian32(x)
#define Endian_bigEndianToHost32(x) Endian_hostToBigEndian32(x)
#define Endian_littleEndianToHost64(x) Endian_hostToLittleEndian64(x)
#define Endian_bigEndianToHost64(x) Endian_hostToBigEndian64(x)
#endif
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