rpc.subproj/xdr_array.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  26  * unrestricted use provided that this legend is included on all tape
  27  * media and as a part of the software program in whole or part.  Users
  28  * may copy or modify Sun RPC without charge, but are not authorized
  29  * to license or distribute it to anyone else except as part of a product or
  30  * program developed by the user.
  31  *
  32  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  33  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  34  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  35  *
  36  * Sun RPC is provided with no support and without any obligation on the
  37  * part of Sun Microsystems, Inc. to assist in its use, correction,
  38  * modification or enhancement.
  39  *
  40  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  41  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  42  * OR ANY PART THEREOF.
  43  *
  44  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  45  * or profits or other special, indirect and consequential damages, even if
  46  * Sun has been advised of the possibility of such damages.
  47  *
  48  * Sun Microsystems, Inc.
  49  * 2550 Garcia Avenue
  50  * Mountain View, California  94043
  51  */
  52
  53 #if defined(LIBC_SCCS) && !defined(lint)
  54 /*static char *sccsid = "from: @(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";*/
  55 /*static char *sccsid = "from: @(#)xdr_array.c  2.1 88/07/29 4.0 RPCSRC";*/
  56 static char *rcsid = "$Id: xdr_array.c,v 1.3.84.1 2002/08/06 19:46:15 bbraun Exp $";
  57 #endif
  58
  59 /*
  60  * xdr_array.c, Generic XDR routines impelmentation.
  61  *
  62  * Copyright (C) 1984, Sun Microsystems, Inc.
  63  *
  64  * These are the "non-trivial" xdr primitives used to serialize and de-serialize
  65  * arrays.  See xdr.h for more info on the interface to xdr.
  66  */
  67
  68 #include <stdio.h>
  69 #include <stdlib.h>
  70 #include <string.h>
  71 #include <rpc/types.h>
  72 #include <rpc/xdr.h>
  73 #include <limits.h>
  74
  75 #define LASTUNSIGNED    ((u_int)0-1)
  76
  77
  78 /*
  79  * XDR an array of arbitrary elements
  80  * *addrp is a pointer to the array, *sizep is the number of elements.
  81  * If addrp is NULL (*sizep * elsize) bytes are allocated.
  82  * elsize is the size (in bytes) of each element, and elproc is the
  83  * xdr procedure to call to handle each element of the array.
  84  */
  85 bool_t
  86 xdr_array(xdrs, addrp, sizep, maxsize, elsize, elproc)
  87         register XDR *xdrs;
  88         caddr_t *addrp;         /* array pointer */
  89         u_int *sizep;           /* number of elements */
  90         u_int maxsize;          /* max numberof elements */
  91         u_int elsize;           /* size in bytes of each element */
  92         xdrproc_t elproc;       /* xdr routine to handle each element */
  93 {
  94         register u_int i;
  95         register caddr_t target = *addrp;
  96         register u_int c;  /* the actual element count */
  97         register bool_t stat = TRUE;
  98         register u_int nodesize;
  99
 100         /* like strings, arrays are really counted arrays */
 101         if (! xdr_u_int(xdrs, sizep)) {
 102                 return (FALSE);
 103         }
 104         c = *sizep;
 105         if ((c > maxsize || UINT_MAX/elsize < c) &&
 106                         (xdrs->x_op != XDR_FREE)) {
 107                 return (FALSE);
 108         }
 109         nodesize = c * elsize;
 110
 111         /*
 112          * if we are deserializing, we may need to allocate an array.
 113          * We also save time by checking for a null array if we are freeing.
 114          */
 115         if (target == NULL)
 116                 switch (xdrs->x_op) {
 117                 case XDR_DECODE:
 118                         if (c == 0)
 119                                 return (TRUE);
 120                         *addrp = target = mem_alloc(nodesize);
 121                         if (target == NULL) {
 122                                 (void) fprintf(stderr,
 123                                         "xdr_array: out of memory\n");
 124                                 return (FALSE);
 125                         }
 126                         bzero(target, nodesize);
 127                         break;
 128
 129                 case XDR_FREE:
 130                         return (TRUE);
 131         }
 132
 133         /*
 134          * now we xdr each element of array
 135          */
 136         for (i = 0; (i < c) && stat; i++) {
 137                 stat = (*elproc)(xdrs, target, LASTUNSIGNED);
 138                 target += elsize;
 139         }
 140
 141         /*
 142          * the array may need freeing
 143          */
 144         if (xdrs->x_op == XDR_FREE) {
 145                 mem_free(*addrp, nodesize);
 146                 *addrp = NULL;
 147         }
 148         return (stat);
 149 }
 150
 151 /*
 152  * xdr_vector():
 153  *
 154  * XDR a fixed length array. Unlike variable-length arrays,
 155  * the storage of fixed length arrays is static and unfreeable.
 156  * > basep: base of the array
 157  * > size: size of the array
 158  * > elemsize: size of each element
 159  * > xdr_elem: routine to XDR each element
 160  */
 161 bool_t
 162 xdr_vector(xdrs, basep, nelem, elemsize, xdr_elem)
 163         register XDR *xdrs;
 164         register char *basep;
 165         register u_int nelem;
 166         register u_int elemsize;
 167         register xdrproc_t xdr_elem;
 168 {
 169         register u_int i;
 170         register char *elptr;
 171
 172         elptr = basep;
 173         for (i = 0; i < nelem; i++) {
 174                 if (! (*xdr_elem)(xdrs, elptr, LASTUNSIGNED)) {
 175                         return(FALSE);
 176                 }
 177                 elptr += elemsize;
 178         }
 179         return(TRUE);
 180 }
 181