lib/libc/xdr/xdr_array.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  *
  29  * @(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro
  30  * @(#)xdr_array.c      2.1 88/07/29 4.0 RPCSRC
  31  * $FreeBSD: src/lib/libc/xdr/xdr_array.c,v 1.8.2.3 2002/08/01 12:23:20 nectar Exp $
  32  * $DragonFly: src/lib/libc/xdr/xdr_array.c,v 1.4 2005/12/05 00:47:57 swildner Exp $
  33  */
  34
  35 /*
  36  * xdr_array.c, Generic XDR routines impelmentation.
  37  *
  38  * Copyright (C) 1984, Sun Microsystems, Inc.
  39  *
  40  * These are the "non-trivial" xdr primitives used to serialize and de-serialize
  41  * arrays.  See xdr.h for more info on the interface to xdr.
  42  */
  43
  44 #include <limits.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <rpc/types.h>
  49 #include <rpc/xdr.h>
  50
  51 #define LASTUNSIGNED ((u_int) 0-1)
  52
  53 /*
  54  * XDR an array of arbitrary elements
  55  * *addrp is a pointer to the array, *sizep is the number of elements.
  56  * If addrp is NULL (*sizep * elsize) bytes are allocated.
  57  * elsize is the size (in bytes) of each element, and elproc is the
  58  * xdr procedure to call to handle each element of the array.
  59  *
  60  * Parameters:
  61  *     addrp:   array pointer
  62  *     sizep:   number of elements
  63  *     maxsize: max number of elements
  64  *     elsize:  size in bytes of each element
  65  *     elproc:  xdr routine to handle each element
  66  */
  67 bool_t
  68 xdr_array(XDR *xdrs, caddr_t *addrp, u_int *sizep, u_int maxsize, u_int elsize,
  69           xdrproc_t elproc)
  70 {
  71         u_int i;
  72         caddr_t target = *addrp;
  73         u_int c;  /* the actual element count */
  74         bool_t stat = TRUE;
  75         u_int nodesize;
  76
  77         /* like strings, arrays are really counted arrays */
  78         if (!xdr_u_int(xdrs, sizep)) {
  79                 return (FALSE);
  80         }
  81         c = *sizep;
  82         if ((c > maxsize || UINT_MAX/elsize < c) &&
  83             (xdrs->x_op != XDR_FREE)) {
  84                 return (FALSE);
  85         }
  86         nodesize = c * elsize;
  87
  88         /*
  89          * if we are deserializing, we may need to allocate an array.
  90          * We also save time by checking for a null array if we are freeing.
  91          */
  92         if (target == NULL)
  93                 switch (xdrs->x_op) {
  94                 case XDR_DECODE:
  95                         if (c == 0)
  96                                 return (TRUE);
  97                         *addrp = target = mem_alloc(nodesize);
  98                         if (target == NULL) {
  99                                 fprintf(stderr,
 100                                         "xdr_array: out of memory\n");
 101                                 return (FALSE);
 102                         }
 103                         memset(target, 0, nodesize);
 104                         break;
 105
 106                 case XDR_FREE:
 107                         return (TRUE);
 108                 case XDR_ENCODE:
 109                         break;
 110         }
 111
 112         /*
 113          * now we xdr each element of array
 114          */
 115         for (i = 0; (i < c) && stat; i++) {
 116                 stat = (*elproc)(xdrs, target, LASTUNSIGNED);
 117                 target += elsize;
 118         }
 119
 120         /*
 121          * the array may need freeing
 122          */
 123         if (xdrs->x_op == XDR_FREE) {
 124                 mem_free(*addrp, nodesize);
 125                 *addrp = NULL;
 126         }
 127         return (stat);
 128 }
 129
 130 /*
 131  * xdr_vector():
 132  *
 133  * XDR a fixed length array. Unlike variable-length arrays,
 134  * the storage of fixed length arrays is static and unfreeable.
 135  * > basep: base of the array
 136  * > size: size of the array
 137  * > elemsize: size of each element
 138  * > xdr_elem: routine to XDR each element
 139  */
 140 bool_t
 141 xdr_vector(XDR *xdrs, char *basep, u_int nelem, u_int elemsize,
 142            xdrproc_t xdr_elem)
 143 {
 144         u_int i;
 145         char *elptr;
 146
 147         elptr = basep;
 148         for (i = 0; i < nelem; i++) {
 149                 if (!(*xdr_elem)(xdrs, elptr, LASTUNSIGNED)) {
 150                         return(FALSE);
 151                 }
 152                 elptr += elemsize;
 153         }
 154         return(TRUE);
 155 }
 156