src/rx/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 #include <afsconfig.h>
  30 #include <afs/param.h>
  31
  32 #ifndef NeXT
  33
  34 #ifndef KERNEL
  35 # include <roken.h>
  36 #endif
  37
  38 #include "rx.h"
  39
  40 /*
  41  * xdr_array.c, Generic XDR routines impelmentation.
  42  *
  43  * Copyright (C) 1984, Sun Microsystems, Inc.
  44  *
  45  * These are the "non-trivial" xdr primitives used to serialize and de-serialize
  46  * arrays.  See xdr.h for more info on the interface to xdr.
  47  */
  48
  49 #if defined(KERNEL) && !defined(UKERNEL)
  50 #if !defined(AFS_LINUX26_ENV)
  51 #include <sys/param.h>
  52 #endif
  53 #ifdef AFS_LINUX20_ENV
  54 #include "h/string.h"
  55 #else
  56 #ifndef AFS_DARWIN90_ENV
  57 #include <sys/systm.h>
  58 #endif
  59 #endif /* AFS_LINUX20_ENV */
  60 #endif
  61 #include "xdr.h"
  62
  63 #define LASTUNSIGNED    ((u_int)0-1)
  64
  65
  66 /*
  67  * XDR an array of arbitrary elements
  68  * *addrp is a pointer to the array, *sizep is the number of elements.
  69  * If addrp is NULL (*sizep * elsize) bytes are allocated.
  70  * elsize is the size (in bytes) of each element, and elproc is the
  71  * xdr procedure to call to handle each element of the array.
  72  */
  73 /*
  74         caddr_t *addrp;         * array pointer *
  75         u_int *sizep;           * number of elements *
  76         u_int maxsize;          * max numberof elements *
  77         u_int elsize;           * size in bytes of each element *
  78         xdrproc_t elproc;       * xdr routine to handle each element *
  79 */
  80
  81 bool_t
  82 xdr_array(XDR * xdrs, caddr_t * addrp, u_int * sizep, u_int maxsize,
  83           u_int elsize, xdrproc_t elproc)
  84 {
  85     u_int i;
  86     caddr_t target = *addrp;
  87     u_int c;            /* the actual element count */
  88     bool_t stat = TRUE;
  89     u_int nodesize;
  90
  91     i = ((~0u) >> 1) / elsize;
  92     if (maxsize > i)
  93         maxsize = i;
  94
  95     /* like strings, arrays are really counted arrays */
  96     if (!xdr_u_int(xdrs, sizep)) {
  97         return (FALSE);
  98     }
  99     c = *sizep;
 100     if ((c > maxsize) && (xdrs->x_op != XDR_FREE)) {
 101         return (FALSE);
 102     }
 103     nodesize = c * elsize;
 104
 105     /*
 106      * if we are deserializing, we may need to allocate an array.
 107      * We also save time by checking for a null array if we are freeing.
 108      */
 109     if (target == NULL)
 110         switch (xdrs->x_op) {
 111         case XDR_DECODE:
 112             if (c == 0)
 113                 return (TRUE);
 114             *addrp = target = (caddr_t)osi_alloc(nodesize);
 115             if (target == NULL) {
 116                 return (FALSE);
 117             }
 118             memset(target, 0, (u_int) nodesize);
 119             break;
 120
 121         case XDR_FREE:
 122             return (TRUE);
 123
 124         case XDR_ENCODE:
 125             break;
 126         }
 127
 128     /*
 129      * now we xdr each element of array
 130      */
 131     for (i = 0; (i < c) && stat; i++) {
 132         stat = (*elproc) (xdrs, target, LASTUNSIGNED);
 133         target += elsize;
 134     }
 135
 136     /*
 137      * the array may need freeing
 138      */
 139     if (xdrs->x_op == XDR_FREE) {
 140         osi_free(*addrp, nodesize);
 141         *addrp = NULL;
 142     }
 143     return (stat);
 144 }
 145 #endif /* NeXT */