#ifndef __mpw_endian_h__
#define __mpw_endian_h__

#include "config.h"

#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
/* aix doesn't have an endian, but gcc #defines _BIG_ENDIAN=1 and __BIG_ENDIAN__=1 */
#error missing endian.h
#endif

#ifdef __APPLE__

#define bswap16 __builtin_bswap16
#define bswap32 __builtin_bswap32
#define bswap64 __builtin_bswap64

#if BYTE_ORDER == LITTLE_ENDIAN
#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))
#else /* BYTE_ORDER != LITTLE_ENDIAN */
#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))
#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");


#endif

#endif