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//==========================================================================

//

//      include/sys/endian.h

//

//      

//

//==========================================================================

//####BSDCOPYRIGHTBEGIN####

//

// -------------------------------------------

//

// Portions of this software may have been derived from OpenBSD or other sources,

// and are covered by the appropriate copyright disclaimers included herein.

//

// -------------------------------------------

//

//####BSDCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    gthomas

// Contributors: gthomas

// Date:         2000-01-10

// Purpose:      

// Description:  

//              

//

//####DESCRIPTIONEND####

//

//==========================================================================

/*      $OpenBSD: endian.h,v 1.4 1999/07/21 05:58:25 csapuntz Exp $     */

/*-

 * Copyright (c) 1997 Niklas Hallqvist.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed by Niklas Hallqvist.

 * 4. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/*

 * Generic definitions for little- and big-endian systems.  Other endianesses

 * has to be dealt with in the specific machine/endian.h file for that port.

 *

 * This file is meant to be included from a little- or big-endian port's

 * machine/endian.h after setting BYTE_ORDER to either 1234 for little endian

 * or 4321 for big..

 */

#ifndef _SYS_ENDIAN_H_

#define _SYS_ENDIAN_H_

#ifndef _POSIX_SOURCE

#include <sys/cdefs.h>

#define LITTLE_ENDIAN   1234

#define BIG_ENDIAN      4321

#define PDP_ENDIAN      3412

#ifdef __GNUC__

#define __swap16gen(x) ({                                               \

        u_int16_t __swap16gen_x = (x);                                  \

                                                                        \

        (u_int16_t)((__swap16gen_x & 0xff) << 8 |                       \

            (__swap16gen_x & 0xff00) >> 8);                             \

})

#define __swap32gen(x) ({                                               \

        u_int32_t __swap32gen_x = (x);                                  \

                                                                        \

        (u_int32_t)((__swap32gen_x & 0xff) << 24 |                      \

            (__swap32gen_x & 0xff00) << 8 |                             \

            (__swap32gen_x & 0xff0000) >> 8 |                           \

            (__swap32gen_x & 0xff000000) >> 24);                        \

})

#else /* __GNUC__ */

/* Note that these macros evaluate their arguments several times.  */

#define __swap16gen(x)                                                  \

    (u_int16_t)(((u_int16_t)(x) & 0xff) << 8 | ((u_int16_t)(x) & 0xff00) >> 8)

#define __swap32gen(x)                                                  \

    (u_int32_t)(((u_int32_t)(x) & 0xff) << 24 |                         \

    ((u_int32_t)(x) & 0xff00) << 8 | ((u_int32_t)(x) & 0xff0000) >> 8 | \

    ((u_int32_t)(x) & 0xff000000) >> 24)

#endif /* __GNUC__ */

/*

 * Define MD_SWAP if you provide swap{16,32}md functions/macros that are

 * optimized for your architecture,  These will be used for swap{16,32}

 * unless the argument is a constant and we are using GCC, where we can

 * take advantage of the CSE phase much better by using the generic version.

 */

#ifdef MD_SWAP

#if __GNUC__

#define swap16(x) ({                                                    \

        u_int16_t __swap16_x = (x);                                     \

                                                                        \

        __builtin_constant_p(x) ? __swap16gen(__swap16_x) :             \

            __swap16md(__swap16_x);                                     \

})

#define swap32(x) ({                                                    \

        u_int32_t __swap32_x = (x);                                     \

                                                                        \

        __builtin_constant_p(x) ? __swap32gen(__swap32_x) :             \

            __swap32md(__swap32_x);                                     \

})

#endif /* __GNUC__  */

#else /* MD_SWAP */

#define swap16 __swap16gen

#define swap32 __swap32gen

#endif /* MD_SWAP */

#define swap16_multi(v, n) do {                                         \

        size_t __swap16_multi_n = (n);                                  \

        u_int16_t *__swap16_multi_v = (v);                              \

                                                                        \

        while (__swap16_multi_n) {                                      \

                *__swap16_multi_v = swap16(*__swap16_multi_v);          \

                __swap16_multi_v++;                                     \

                __swap16_multi_n--;                                     \

        }                                                               \

} while (0)

__BEGIN_DECLS

u_int32_t       htobe32 __P((u_int32_t));

u_int16_t       htobe16 __P((u_int16_t));

u_int32_t       betoh32 __P((u_int32_t));

u_int16_t       betoh16 __P((u_int16_t));

u_int32_t       htole32 __P((u_int32_t));

u_int16_t       htole16 __P((u_int16_t));

u_int32_t       letoh32 __P((u_int32_t));

u_int16_t       letoh16 __P((u_int16_t));

__END_DECLS

#if BYTE_ORDER == LITTLE_ENDIAN

/* Can be overridden by machine/endian.h before inclusion of this file.  */

#ifndef _QUAD_HIGHWORD

#define _QUAD_HIGHWORD 1

#endif

#ifndef _QUAD_LOWWORD

#define _QUAD_LOWWORD 0

#endif

#define htobe16 swap16

#define htobe32 swap32

#define betoh16 swap16

#define betoh32 swap32

#define htole16(x) (x)

#define htole32(x) (x)

#define letoh16(x) (x)

#define letoh32(x) (x)

#endif /* BYTE_ORDER */

#if BYTE_ORDER == BIG_ENDIAN

/* Can be overridden by machine/endian.h before inclusion of this file.  */

#ifndef _QUAD_HIGHWORD

#define _QUAD_HIGHWORD 0

#endif

#ifndef _QUAD_LOWWORD

#define _QUAD_LOWWORD 1

#endif

#define htole16 swap16

#define htole32 swap32

#define letoh16 swap16

#define letoh32 swap32

#define htobe16(x) (x)

#define htobe32(x) (x)

#define betoh16(x) (x)

#define betoh32(x) (x)

#endif /* BYTE_ORDER */

#define htons htobe16

#define htonl htobe32

#define ntohs betoh16

#define ntohl betoh32

#define NTOHL(x) (x) = ntohl((u_int32_t)(x))

#define NTOHS(x) (x) = ntohs((u_int16_t)(x))

#define HTONL(x) (x) = htonl((u_int32_t)(x))

#define HTONS(x) (x) = htons((u_int16_t)(x))

#endif /* _POSIX_SOURCE */

#endif /* _SYS_ENDIAN_H_ */