mpw/include/endian.h

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#ifndef __mpw_endian_h__
#define __mpw_endian_h__
#include "config.h"
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#include <stdint.h>
#if defined(HAVE_ENDIAN_H)
#include <endian.h>
#elif defined(HAVE_SYS_ENDIAN_H)
#include <sys/endian.h>
#elif defined(HAVE_MACHINE_ENDIAN_H)
#include <machine/endian.h>
#else
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/* aix doesn't have an endian, but gcc #defines _BIG_ENDIAN=1 and __BIG_ENDIAN__=1 */
#error missing endian.h
#endif
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#ifdef __APPLE__
#define bswap16 __builtin_bswap16
#define bswap32 __builtin_bswap32
#define bswap64 __builtin_bswap64
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define htobe16(x) bswap16((x))
#define htobe32(x) bswap32((x))
#define htobe64(x) bswap64((x))
#define htole16(x) ((uint16_t)(x))
#define htole32(x) ((uint32_t)(x))
#define htole64(x) ((uint64_t)(x))
#define be16toh(x) bswap16((x))
#define be32toh(x) bswap32((x))
#define be64toh(x) bswap64((x))
#define le16toh(x) ((uint16_t)(x))
#define le32toh(x) ((uint32_t)(x))
#define le64toh(x) ((uint64_t)(x))
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#else /* BYTE_ORDER != LITTLE_ENDIAN */
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#define htobe16(x) ((uint16_t)(x))
#define htobe32(x) ((uint32_t)(x))
#define htobe64(x) ((uint64_t)(x))
#define htole16(x) bswap16((x))
#define htole32(x) bswap32((x))
#define htole64(x) bswap64((x))
#define be16toh(x) ((uint16_t)(x))
#define be32toh(x) ((uint32_t)(x))
#define be64toh(x) ((uint64_t)(x))
#define le16toh(x) bswap16((x))
#define le32toh(x) bswap32((x))
#define le64toh(x) bswap64((x))
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#endif /* BYTE_ORDER == LITTLE_ENDIAN */
#endif
#ifdef __cplusplus
// https://github.com/HowardHinnant/hash_append/blob/master/endian.h
enum class endian
{
native = LITTLE_ENDIAN,
little = LITTLE_ENDIAN,
big = BIG_ENDIAN
};
static_assert(endian::native == endian::little ||
endian::native == endian::big,
"endian::native shall be one of endian::little or endian::big");
static_assert(endian::big != endian::little,
"endian::big and endian::little shall have different values");
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#endif
#endif