StdLib/Include/sys/endian.h

/** @file
    Byte order related definitions and declarations.

    Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
    This program and the accompanying materials are licensed and made available
    under the terms and conditions of the BSD License that accompanies this
    distribution.  The full text of the license may be found at
    http://opensource.org/licenses/bsd-license.

    THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
    WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

    Copyright (c) 1990, 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:
      - Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.
      - 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.
      - 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDERS 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.

    NetBSD: endian.h,v 1.24 2006/05/05 15:08:11 christos Exp
    endian.h  8.1 (Berkeley) 6/11/93
**/
#ifndef _SYS_ENDIAN_H_
#define _SYS_ENDIAN_H_

#include  <sys/EfiCdefs.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) || defined(_NETBSD_SOURCE)
#ifndef _LOCORE

/* C-family endian-ness definitions */

#include  <sys/ansi.h>
#include  <sys/types.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) __attribute__((__const__));
uint16_t htons(uint16_t) __attribute__((__const__));
uint32_t ntohl(uint32_t) __attribute__((__const__));
uint16_t ntohs(uint16_t) __attribute__((__const__));
__END_DECLS

#endif /* !_LOCORE */
#endif /* _XOPEN_SOURCE || _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)  (x)
#define ntohs(x)  (x)
#define htonl(x)  (x)
#define htons(x)  (x)

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

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

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

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

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

#if BYTE_ORDER == BIG_ENDIAN

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

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

#else /* LITTLE_ENDIAN */

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

#define HTOBE16(x)  (x) = bswap16((uint16_t)(x))
#define HTOBE32(x)  (x) = bswap32((uint32_t)(x))
#define HTOBE64(x)  (x) = bswap64((uint64_t)(x))
#define HTOLE16(x)  (void) (x)
#define HTOLE32(x)  (void) (x)
#define HTOLE64(x)  (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.
 */

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

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

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

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

static __inline uint16_t __unused
be16dec(const void *buf)
{
  const uint8_t *p = (const uint8_t *)buf;

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

static __inline uint16_t __unused
le16dec(const void *buf)
{
  const uint8_t *p = (const uint8_t *)buf;

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

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

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

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

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

static __inline uint32_t __unused
be32dec(const void *buf)
{
  const uint8_t *p = (const uint8_t *)buf;

  return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
}

static __inline uint32_t __unused
le32dec(const void *buf)
{
  const uint8_t *p = (const uint8_t *)buf;

  return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
}

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

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

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

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

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

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

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