/*

 * xdr_sizeof.c

 *

 * Copyright (c) 2010, Oracle America, Inc.

 *

 * 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 "Oracle America, Inc." 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 HOLDER 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.

 *

 * General purpose routine to see how much space something will use

 * when serialized using XDR.

 */

#include <rpc/types.h>

#include <rpc/xdr.h>

#include <sys/types.h>

#include <stdlib.h>

#include <shlib-compat.h>

/* ARGSUSED */

static bool_t

x_putlong (XDR *xdrs, const long *longp)

{

  xdrs->x_handy += BYTES_PER_XDR_UNIT;

  return TRUE;

}

/* ARGSUSED */

static bool_t

x_putbytes (XDR *xdrs, const char *bp, u_int len)

{

  xdrs->x_handy += len;

  return TRUE;

}

static u_int

x_getpostn (const XDR *xdrs)

{

  return xdrs->x_handy;

}

/* ARGSUSED */

static bool_t

x_setpostn (XDR *xdrs, u_int len)

{

  /* This is not allowed */

  return FALSE;

}

static int32_t *

x_inline (XDR *xdrs, u_int len)

{

  if (len == 0)

    return NULL;

  if (xdrs->x_op != XDR_ENCODE)

    return NULL;

  if (len < (u_int) (long int) xdrs->x_base)

    {

      /* x_private was already allocated */

      xdrs->x_handy += len;

      return (int32_t *) xdrs->x_private;

    }

  else

    {

      /* Free the earlier space and allocate new area */

      free (xdrs->x_private);

      if ((xdrs->x_private = (caddr_t) malloc (len)) == NULL)

	{

	  xdrs->x_base = 0;

	  return NULL;

	}

      xdrs->x_base = (void *) (long) len;

      xdrs->x_handy += len;

      return (int32_t *) xdrs->x_private;

    }

}

static int

harmless (void)

{

  /* Always return FALSE/NULL, as the case may be */

  return 0;

}

static void

x_destroy (XDR *xdrs)

{

  xdrs->x_handy = 0;

  xdrs->x_base = 0;

  if (xdrs->x_private)

    {

      free (xdrs->x_private);

      xdrs->x_private = NULL;

    }

  return;

}

static bool_t

x_putint32 (XDR *xdrs, const int32_t *int32p)

{

  xdrs->x_handy += BYTES_PER_XDR_UNIT;

  return TRUE;

}

unsigned long

xdr_sizeof (xdrproc_t func, void *data)

{

  XDR x;

  struct xdr_ops ops;

  bool_t stat;

  /* to stop ANSI-C compiler from complaining */

  typedef bool_t (*dummyfunc1) (XDR *, long *);

  typedef bool_t (*dummyfunc2) (XDR *, caddr_t, u_int);

  typedef bool_t (*dummyfunc3) (XDR *, int32_t *);

  ops.x_putlong = x_putlong;

  ops.x_putbytes = x_putbytes;

  ops.x_inline = x_inline;

  ops.x_getpostn = x_getpostn;

  ops.x_setpostn = x_setpostn;

  ops.x_destroy = x_destroy;

  ops.x_putint32 = x_putint32;

  /* the other harmless ones */

  ops.x_getlong = (dummyfunc1) harmless;

  ops.x_getbytes = (dummyfunc2) harmless;

  ops.x_getint32 = (dummyfunc3) harmless;

  x.x_op = XDR_ENCODE;

  x.x_ops = &ops;

  x.x_handy = 0;

  x.x_private = (caddr_t) NULL;

  x.x_base = (caddr_t) 0;

  stat = func (&x, data);

  free (x.x_private);

  return stat == TRUE ? x.x_handy : 0;

}

#ifdef EXPORT_RPC_SYMBOLS

libc_hidden_def (xdr_sizeof)

#else

libc_hidden_nolink_sunrpc (xdr_sizeof, GLIBC_2_1)

#endif