inet_ntop.c

mediastreamer2是开源的网络传输媒体流的库

/*
  eXosip - This is the eXtended osip library.
  Copyright (C) 2002,2003,2004,2005,2006,2007  Aymeric MOIZARD  - [e-mail]
  
  eXosip is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.
  
  eXosip is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/


/* This is from the BIND 4.9.4 release, modified to compile by itself */

/* Copyright (c) 1996 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#if defined(WIN32) || defined(_WIN32_WCE)

#include <osipparser2/osip_port.h>
#include "eXosip2.h"

#include <windowsx.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <iphlpapi.h>

#include "inet_ntop.h"

/* added by adm */
/*
 * the definitions below are valid for 32-bit architectures and will have to
 * be adjusted for 16- or 64-bit architectures
 */
typedef unsigned __int8 uint8_t;
typedef unsigned __int16 uint16_t;
typedef unsigned __int32 uint32_t;
typedef unsigned __int64 uint64_t;
typedef __int8 int8_t;
typedef __int16 int16_t;
typedef __int32 int32_t;
typedef __int64 int64_t;
typedef unsigned long in_addr_t;

/* !added by amd */

#define	IN6ADDRSZ	16
#define	INT16SZ		 2

#ifndef	AF_INET6
#define	AF_INET6	AF_MAX+1        /* just to let this compile */
#endif

/*
 * WARNING: Don't even consider trying to compile this on a system where
 * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
 */

static const char *_inet_ntop4 (const u_char * src, char *dst, size_t size);
static const char *_inet_ntop6 (const u_char * src, char *dst, size_t size);

/* char *
 * inet_ntop(af, src, dst, size)
 *	convert a network format address to presentation format.
 * return:
 *	pointer to presentation format address (`dst'), or NULL (see errno).
 * author:
 *	Paul Vixie, 1996.
 */
const char *
_inet_ntop (af, src, dst, size)
     int af;
     const void *src;
     char *dst;
     size_t size;
{
  switch (af)
    {
      case AF_INET:
        return (_inet_ntop4 (src, dst, size));
      case AF_INET6:
        return (_inet_ntop6 (src, dst, size));
      default:
#ifndef _WIN32_WCE
        errno = EAFNOSUPPORT;
#endif
        return (NULL);
    }
  /* NOTREACHED */
}

/* const char *
 * inet_ntop4(src, dst, size)
 *	format an IPv4 address, more or less like inet_ntoa()
 * return:
 *	`dst' (as a const)
 * notes:
 *	(1) uses no statics
 *	(2) takes a u_char* not an in_addr as input
 * author:
 *	Paul Vixie, 1996.
 */
static const char *
_inet_ntop4 (src, dst, size)
     const u_char *src;
     char *dst;
     size_t size;
{
  static const char fmt[] = "%u.%u.%u.%u";
  char tmp[sizeof "255.255.255.255"];

  sprintf (tmp, fmt, src[0], src[1], src[2], src[3]);
  if ((size_t) strlen (tmp) > size)
    {
#ifndef _WIN32_WCE
      errno = ENOSPC;
#endif
      return (NULL);
    }
  strcpy (dst, tmp);
  return (dst);
}

/* const char *
 * inet_ntop6(src, dst, size)
 *	convert IPv6 binary address into presentation (printable) format
 * author:
 *	Paul Vixie, 1996.
 */
static const char *
_inet_ntop6 (src, dst, size)
     const u_char *src;
     char *dst;
     size_t size;
{
  /*
   * Note that int32_t and int16_t need only be "at least" large enough
   * to contain a value of the specified size.  On some systems, like
   * Crays, there is no such thing as an integer variable with 16 bits.
   * Keep this in mind if you think this function should have been coded
   * to use pointer overlays.  All the world's not a VAX.
   */
  char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
  struct
  {
    int base, len;
  } best, cur;
  uint32_t words[IN6ADDRSZ / INT16SZ];
  int i;

  /*
   * Preprocess:
   *      Copy the input (bytewise) array into a wordwise array.
   *      Find the longest run of 0x00's in src[] for :: shorthanding.
   */
  memset (words, 0, sizeof words);
  for (i = 0; i < IN6ADDRSZ; i++)
    words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
  best.base = -1;
  cur.base = -1;
  for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++)
    {
      if (words[i] == 0)
        {
          if (cur.base == -1)
            cur.base = i, cur.len = 1;
          else
            cur.len++;
      } else
        {
          if (cur.base != -1)
            {
              if (best.base == -1 || cur.len > best.len)
                best = cur;
              cur.base = -1;
            }
        }
    }
  if (cur.base != -1)
    {
      if (best.base == -1 || cur.len > best.len)
        best = cur;
    }
  if (best.base != -1 && best.len < 2)
    best.base = -1;

  /*
   * Format the result.
   */
  tp = tmp;
  for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++)
    {
      /* Are we inside the best run of 0x00's? */
      if (best.base != -1 && i >= best.base && i < (best.base + best.len))
        {
          if (i == best.base)
            *tp++ = ':';
          continue;
        }
      /* Are we following an initial run of 0x00s or any real hex? */
      if (i != 0)
        *tp++ = ':';
      /* Is this address an encapsulated IPv4? */
      if (i == 6 && best.base == 0 &&
          (best.len == 6 || (best.len == 5 && words[5] == 0xffff)))
        {
          if (!_inet_ntop4 (src + 12, tp, sizeof tmp - (tp - tmp)))
            return (NULL);
          tp += strlen (tp);
          break;
        }
      sprintf (tp, "%x", words[i]);
      tp += strlen (tp);
    }
  /* Was it a trailing run of 0x00's? */
  if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ))
    *tp++ = ':';
  *tp++ = '\0';

  /*
   * Check for overflow, copy, and we're done.
   */
  if ((size_t) (tp - tmp) > size)
    {
#if !defined (_WIN32_WCE)
      errno = ENOSPC;
#endif
      return (NULL);
    }
  strcpy (dst, tmp);
  return (dst);
}

#endif