1 /* $OpenBSD: xdr_array.c,v 1.9 2005/08/08 08:05:36 espie Exp $ */
2 /*
3 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
4 * unrestricted use provided that this legend is included on all tape
5 * media and as a part of the software program in whole or part. Users
6 * may copy or modify Sun RPC without charge, but are not authorized
7 * to license or distribute it to anyone else except as part of a product or
8 * program developed by the user.
9 *
10 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
11 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
12 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
13 *
14 * Sun RPC is provided with no support and without any obligation on the
15 * part of Sun Microsystems, Inc. to assist in its use, correction,
16 * modification or enhancement.
17 *
18 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
19 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
20 * OR ANY PART THEREOF.
21 *
22 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
23 * or profits or other special, indirect and consequential damages, even if
24 * Sun has been advised of the possibility of such damages.
25 *
26 * Sun Microsystems, Inc.
27 * 2550 Garcia Avenue
28 * Mountain View, California 94043
29 */
30
31 /*
32 * xdr_array.c, Generic XDR routines implementation.
33 *
34 * Copyright (C) 1984, Sun Microsystems, Inc.
35 *
36 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
37 * arrays. See xdr.h for more info on the interface to xdr.
38 */
39
40
41
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <limits.h>
46 #include <rpc/types.h>
47 #include <rpc/xdr.h>
48
49 /*
50 * XDR an array of arbitrary elements
51 * *addrp is a pointer to the array, *sizep is the number of elements.
52 * If addrp is NULL (*sizep * elsize) bytes are allocated.
53 * elsize is the size (in bytes) of each element, and elproc is the
54 * xdr procedure to call to handle each element of the array.
55 */
56 bool_t
xdr_array(XDR * xdrs,caddr_t * addrp,u_int * sizep,u_int maxsize,u_int elsize,xdrproc_t elproc)57 xdr_array(XDR *xdrs,
58 caddr_t *addrp, /* array pointer */
59 u_int *sizep, /* number of elements */
60 u_int maxsize, /* max numberof elements */
61 u_int elsize, /* size in bytes of each element */
62 xdrproc_t elproc) /* xdr routine to handle each element */
63 {
64 caddr_t target = *addrp;
65 u_int nodesize, c, i;
66 bool_t stat = TRUE;
67
68 /* like strings, arrays are really counted arrays */
69 if (!xdr_u_int(xdrs, sizep))
70 return (FALSE);
71
72 c = *sizep;
73 if ((c > maxsize || c > UINT_MAX/elsize) &&
74 xdrs->x_op != XDR_FREE)
75 return (FALSE);
76 nodesize = c * elsize;
77
78 /*
79 * if we are deserializing, we may need to allocate an array.
80 * We also save time by checking for a null array if we are freeing.
81 */
82 if (target == NULL) {
83 switch (xdrs->x_op) {
84 case XDR_DECODE:
85 if (c == 0)
86 return (TRUE);
87 *addrp = target = mem_alloc(nodesize);
88 if (target == NULL) {
89 (void) fprintf(stderr,
90 "xdr_array: out of memory\n");
91 return (FALSE);
92 }
93 memset(target, 0, nodesize);
94 break;
95 case XDR_FREE:
96 return (TRUE);
97 }
98 }
99
100 /*
101 * now we xdr each element of array
102 */
103 for (i = 0; (i < c) && stat; i++) {
104 stat = (*elproc)(xdrs, target);
105 target += elsize;
106 }
107
108 /*
109 * the array may need freeing
110 */
111 if (xdrs->x_op == XDR_FREE) {
112 mem_free(*addrp, nodesize);
113 *addrp = NULL;
114 }
115 return (stat);
116 }
117
118 /*
119 * xdr_vector():
120 *
121 * XDR a fixed length array. Unlike variable-length arrays,
122 * the storage of fixed length arrays is static and unfreeable.
123 * > basep: base of the array
124 * > size: size of the array
125 * > elemsize: size of each element
126 * > xdr_elem: routine to XDR each element
127 */
128 bool_t
xdr_vector(XDR * xdrs,char * basep,u_int nelem,u_int elemsize,xdrproc_t xdr_elem)129 xdr_vector(XDR *xdrs, char *basep, u_int nelem, u_int elemsize,
130 xdrproc_t xdr_elem)
131 {
132 char *elptr;
133 u_int i;
134
135 elptr = basep;
136 for (i = 0; i < nelem; i++) {
137 if (!(*xdr_elem)(xdrs, elptr))
138 return(FALSE);
139 elptr += elemsize;
140 }
141 return(TRUE);
142 }
143