/*      $NetBSD: endian.h,v 1.39 2026/01/08 15:39:08 nia Exp $  */

/*
 * Copyright (c) 1987, 1991, 1993
 *      The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 *
 *      @(#)endian.h    8.1 (Berkeley) 6/11/93
 */

#ifndef _SYS_ENDIAN_H_
#define _SYS_ENDIAN_H_

#include <sys/featuretest.h>

/*
 * Definitions for byte order, according to byte significance from low
 * address to high.
 */
#define _LITTLE_ENDIAN  1234    /* LSB first: i386, vax */
#define _BIG_ENDIAN     4321    /* MSB first: 68000, ibm, net */
#define _PDP_ENDIAN     3412    /* LSB first in word, MSW first in long */


#if defined(_XOPEN_SOURCE) || \
    (_POSIX_C_SOURCE - 0) >= 200112L || \
    defined(_NETBSD_SOURCE)
#ifndef _LOCORE

/* C-family endian-ness definitions */

#include <sys/ansi.h>
#include <sys/cdefs.h>
#include <sys/stdint.h>

#ifndef in_addr_t
typedef __in_addr_t     in_addr_t;
#define in_addr_t       __in_addr_t
#endif

#ifndef in_port_t
typedef __in_port_t     in_port_t;
#define in_port_t       __in_port_t
#endif

__BEGIN_DECLS
uint32_t htonl(uint32_t) __constfunc;
uint16_t htons(uint16_t) __constfunc;
uint32_t ntohl(uint32_t) __constfunc;
uint16_t ntohs(uint16_t) __constfunc;
__END_DECLS

#endif /* !_LOCORE */
#endif /* _XOPEN_SOURCE || _POSIX_C_SOURCE >= 200112L || _NETBSD_SOURCE */


#include <machine/endian_machdep.h>

/*
 * Define the order of 32-bit words in 64-bit words.
 */
#if _BYTE_ORDER == _LITTLE_ENDIAN
#define _QUAD_HIGHWORD 1
#define _QUAD_LOWWORD 0
#endif

#if _BYTE_ORDER == _BIG_ENDIAN
#define _QUAD_HIGHWORD 0
#define _QUAD_LOWWORD 1
#endif


#if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE)
/*
 *  Traditional names for byteorder.  These are defined as the numeric
 *  sequences so that third party code can "#define XXX_ENDIAN" and not
 *  cause errors.
 */
#define LITTLE_ENDIAN   1234            /* LSB first: i386, vax */
#define BIG_ENDIAN      4321            /* MSB first: 68000, ibm, net */
#define PDP_ENDIAN      3412            /* LSB first in word, MSW first in long */
#define BYTE_ORDER      _BYTE_ORDER

#ifndef _LOCORE

#include <machine/bswap.h>

/*
 * Macros for network/external number representation conversion.
 */
#if BYTE_ORDER == BIG_ENDIAN && !defined(__lint__)
#define ntohl(x)        __CAST(uint32_t, (x))
#define ntohs(x)        __CAST(uint16_t, (x))
#define htonl(x)        __CAST(uint32_t, (x))
#define htons(x)        __CAST(uint16_t, (x))

#define NTOHL(x)        __CAST(void, (x))
#define NTOHS(x)        __CAST(void, (x))
#define HTONL(x)        __CAST(void, (x))
#define HTONS(x)        __CAST(void, (x))

#else   /* LITTLE_ENDIAN || defined(__lint__) */

#define ntohl(x)        bswap32(__CAST(uint32_t, (x)))
#define ntohs(x)        bswap16(__CAST(uint16_t, (x)))
#define htonl(x)        bswap32(__CAST(uint32_t, (x)))
#define htons(x)        bswap16(__CAST(uint16_t, (x)))

#define NTOHL(x)        (x) = ntohl(__CAST(uint32_t, (x)))
#define NTOHS(x)        (x) = ntohs(__CAST(uint16_t, (x)))
#define HTONL(x)        (x) = htonl(__CAST(uint32_t, (x)))
#define HTONS(x)        (x) = htons(__CAST(uint16_t, (x)))
#endif  /* LITTLE_ENDIAN || defined(__lint__) */

/*
 * Macros to convert to a specific endianness.
 */

#if BYTE_ORDER == BIG_ENDIAN

#define htobe16(x)      __CAST(uint16_t, (x))
#define htobe32(x)      __CAST(uint32_t, (x))
#define htobe64(x)      __CAST(uint64_t, (x))
#define htole16(x)      bswap16(__CAST(uint16_t, (x)))
#define htole32(x)      bswap32(__CAST(uint32_t, (x)))
#define htole64(x)      bswap64(__CAST(uint64_t, (x)))

#define HTOBE16(x)      __CAST(void, (x))
#define HTOBE32(x)      __CAST(void, (x))
#define HTOBE64(x)      __CAST(void, (x))
#define HTOLE16(x)      (x) = bswap16(__CAST(uint16_t, (x)))
#define HTOLE32(x)      (x) = bswap32(__CAST(uint32_t, (x)))
#define HTOLE64(x)      (x) = bswap64(__CAST(uint64_t, (x)))

#else   /* LITTLE_ENDIAN */

#define htobe16(x)      bswap16(__CAST(uint16_t, (x)))
#define htobe32(x)      bswap32(__CAST(uint32_t, (x)))
#define htobe64(x)      bswap64(__CAST(uint64_t, (x)))
#define htole16(x)      __CAST(uint16_t, (x))
#define htole32(x)      __CAST(uint32_t, (x))
#define htole64(x)      __CAST(uint64_t, (x))

#define HTOBE16(x)      (x) = bswap16(__CAST(uint16_t, (x)))
#define HTOBE32(x)      (x) = bswap32(__CAST(uint32_t, (x)))
#define HTOBE64(x)      (x) = bswap64(__CAST(uint64_t, (x)))
#define HTOLE16(x)      __CAST(void, (x))
#define HTOLE32(x)      __CAST(void, (x))
#define HTOLE64(x)      __CAST(void, (x))

#endif  /* LITTLE_ENDIAN */

#define be16toh(x)      htobe16(x)
#define be32toh(x)      htobe32(x)
#define be64toh(x)      htobe64(x)
#define le16toh(x)      htole16(x)
#define le32toh(x)      htole32(x)
#define le64toh(x)      htole64(x)

#define BE16TOH(x)      HTOBE16(x)
#define BE32TOH(x)      HTOBE32(x)
#define BE64TOH(x)      HTOBE64(x)
#define LE16TOH(x)      HTOLE16(x)
#define LE32TOH(x)      HTOLE32(x)
#define LE64TOH(x)      HTOLE64(x)

/*
 * Routines to encode/decode big- and little-endian multi-octet values
 * to/from an octet stream.
 */

#ifdef _NETBSD_SOURCE

#if __GNUC_PREREQ__(2, 95) && !defined(__HAVE_SLOW_BSWAP_BUILTIN)

#define __GEN_ENDIAN_ENC(bits, endian) \
static __inline void __unused \
endian ## bits ## enc(void *dst, uint ## bits ## _t u) \
{ \
        u = hto ## endian ## bits (u); \
        __builtin_memcpy(dst, &u, sizeof(u)); \
}

__GEN_ENDIAN_ENC(16, be)
__GEN_ENDIAN_ENC(32, be)
__GEN_ENDIAN_ENC(64, be)
__GEN_ENDIAN_ENC(16, le)
__GEN_ENDIAN_ENC(32, le)
__GEN_ENDIAN_ENC(64, le)
#undef __GEN_ENDIAN_ENC

#define __GEN_ENDIAN_DEC(bits, endian) \
static __inline uint ## bits ## _t __unused \
endian ## bits ## dec(const void *_buf) \
{ \
        uint ## bits ## _t u; \
        __builtin_memcpy(&u, _buf, sizeof(u)); \
        return endian ## bits ## toh (u); \
}

__GEN_ENDIAN_DEC(16, be)
__GEN_ENDIAN_DEC(32, be)
__GEN_ENDIAN_DEC(64, be)
__GEN_ENDIAN_DEC(16, le)
__GEN_ENDIAN_DEC(32, le)
__GEN_ENDIAN_DEC(64, le)
#undef __GEN_ENDIAN_DEC

#else   /* !(GCC >= 2.95 && !__HAVE_SLOW_BSWAP_BUILTIN) */

static __inline void __unused
be16enc(void *_buf, uint16_t u)
{
        uint8_t *p = __CAST(uint8_t *, _buf);

        p[0] = __CAST(uint8_t, ((__CAST(unsigned, u) >> 8) & 0xff));
        p[1] = __CAST(uint8_t, (u & 0xff));
}

static __inline void __unused
le16enc(void *_buf, uint16_t u)
{
        uint8_t *p = __CAST(uint8_t *, _buf);

        p[0] = __CAST(uint8_t, (u & 0xff));
        p[1] = __CAST(uint8_t, ((__CAST(unsigned, u) >> 8) & 0xff));
}

static __inline uint16_t __unused
be16dec(const void *_buf)
{
        const uint8_t *p = __CAST(const uint8_t *, _buf);

        return ((__CAST(uint16_t, p[0]) << 8) | p[1]);
}

static __inline uint16_t __unused
le16dec(const void *_buf)
{
        const uint8_t *p = __CAST(const uint8_t *, _buf);

        return (p[0] | (__CAST(uint16_t, p[1]) << 8));
}

static __inline void __unused
be32enc(void *_buf, uint32_t u)
{
        uint8_t *p = __CAST(uint8_t *, _buf);

        p[0] = __CAST(uint8_t, ((u >> 24) & 0xff));
        p[1] = __CAST(uint8_t, ((u >> 16) & 0xff));
        p[2] = __CAST(uint8_t, ((u >> 8) & 0xff));
        p[3] = __CAST(uint8_t, (u & 0xff));
}

static __inline void __unused
le32enc(void *_buf, uint32_t u)
{
        uint8_t *p = __CAST(uint8_t *, _buf);

        p[0] = __CAST(uint8_t, (u & 0xff));
        p[1] = __CAST(uint8_t, ((u >> 8) & 0xff));
        p[2] = __CAST(uint8_t, ((u >> 16) & 0xff));
        p[3] = __CAST(uint8_t, ((u >> 24) & 0xff));
}

static __inline uint32_t __unused
be32dec(const void *_buf)
{
        const uint8_t *p = __CAST(const uint8_t *, _buf);

        return ((__CAST(uint32_t, be16dec(p)) << 16) | be16dec(p + 2));
}

static __inline uint32_t __unused
le32dec(const void *_buf)
{
        const uint8_t *p = __CAST(const uint8_t *, _buf);

        return (le16dec(p) | (__CAST(uint32_t, le16dec(p + 2)) << 16));
}

static __inline void __unused
be64enc(void *_buf, uint64_t u)
{
        uint8_t *p = __CAST(uint8_t *, _buf);

        be32enc(p, __CAST(uint32_t, (u >> 32)));
        be32enc(p + 4, __CAST(uint32_t, (u & 0xffffffffULL)));
}

static __inline void __unused
le64enc(void *_buf, uint64_t u)
{
        uint8_t *p = __CAST(uint8_t *, _buf);

        le32enc(p, __CAST(uint32_t, (u & 0xffffffffULL)));
        le32enc(p + 4, __CAST(uint32_t, (u >> 32)));
}

static __inline uint64_t __unused
be64dec(const void *_buf)
{
        const uint8_t *p = (const uint8_t *)_buf;

        return ((__CAST(uint64_t, be32dec(p)) << 32) | be32dec(p + 4));
}

static __inline uint64_t __unused
le64dec(const void *_buf)
{
        const uint8_t *p = (const uint8_t *)_buf;

        return (le32dec(p) | (__CAST(uint64_t, le32dec(p + 4)) << 32));
}

#endif  /* GCC >= 2.95 */

#endif  /* _NETBSD_SOURCE */

#endif /* !_LOCORE */
#endif /* _XOPEN_SOURCE || _NETBSD_SOURCE */
#endif /* !_SYS_ENDIAN_H_ */