/*
 * Copyright (c) 2009, Sun Microsystems, Inc.
 * 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 Sun Microsystems, 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.
 */

/*
 * xdr_array.c, Generic XDR routines impelmentation.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 *
 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
 * arrays.  See xdr.h for more info on the interface to xdr.
 */

#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include <rpc/types.h>
#include <rpc/xdr.h>

#include "xdr_private.h"

/*
 * XDR an array of arbitrary elements
 * *addrp is a pointer to the array, *sizep is the number of elements.
 * If addrp is NULL (*sizep * elsize) bytes are allocated.
 * elsize is the size (in bytes) of each element, and elproc is the
 * xdr procedure to call to handle each element of the array.
 */
bool_t
xdr_array (XDR * xdrs,
	caddr_t * addrp,
	u_int * sizep,
	u_int maxsize,
        u_int elsize,
	xdrproc_t elproc)
{
  u_int i;
  caddr_t target = *addrp;
  u_int c;                      /* the actual element count */
  bool_t stat = TRUE;
  u_int nodesize;

  /* like strings, arrays are really counted arrays */
  if (!xdr_u_int (xdrs, sizep))
    {
      return FALSE;
    }
  c = *sizep;
  if ((c > maxsize || UINT_MAX / elsize < c) && (xdrs->x_op != XDR_FREE))
    {
      return FALSE;
    }
  nodesize = c * elsize;

  /*
   * if we are deserializing, we may need to allocate an array.
   * We also save time by checking for a null array if we are freeing.
   */
  if (target == NULL)
    switch (xdrs->x_op)
      {
      case XDR_DECODE:
        if (c == 0)
          return TRUE;
        *addrp = target = mem_alloc (nodesize);
        if (target == NULL)
          {
            xdr_warnx ("xdr_array: out of memory");
            errno = ENOMEM;
            return FALSE;
          }
        memset (target, 0, nodesize);
        break;

      case XDR_FREE:
        return TRUE;

      case XDR_ENCODE:
        break;
      }

  /*
   * now we xdr each element of array
   */
  for (i = 0; (i < c) && stat; i++)
    {
      stat = (*elproc) (xdrs, target);
      target += elsize;
    }

  /*
   * the array may need freeing
   */
  if (xdrs->x_op == XDR_FREE)
    {
      mem_free (*addrp, nodesize);
      *addrp = NULL;
    }
  return (stat);
}

/*
 * xdr_vector():
 *
 * XDR a fixed length array. Unlike variable-length arrays,
 * the storage of fixed length arrays is static and unfreeable.
 * > basep: base of the array
 * > size: size of the array
 * > elemsize: size of each element
 * > xdr_elem: routine to XDR each element
 */
bool_t
xdr_vector (XDR * xdrs,
	char *basep,
	u_int nelem,
	u_int elemsize,
        xdrproc_t xdr_elem)
{
  u_int i;
  char *elptr;

  elptr = basep;
  for (i = 0; i < nelem; i++)
    {
      if (!(*xdr_elem) (xdrs, elptr))
        {
          return FALSE;
        }
      elptr += elemsize;
    }
  return TRUE;
}