1 /* $NetBSD: xdr_array.c,v 1.12 2000/01/22 22:19:18 mycroft Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 2010, Oracle America, Inc.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are
10 * met:
11 *
12 * * Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * * Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer in the documentation and/or other materials
17 * provided with the distribution.
18 * * Neither the name of the "Oracle America, Inc." nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
29 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
33 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #if defined(LIBC_SCCS) && !defined(lint)
37 static char *sccsid2 = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";
38 static char *sccsid = "@(#)xdr_array.c 2.1 88/07/29 4.0 RPCSRC";
39 #endif
40 /*
41 * xdr_array.c, Generic XDR routines implementation.
42 *
43 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
44 * arrays. See xdr.h for more info on the interface to xdr.
45 */
46
47 #include "namespace.h"
48 #include <err.h>
49 #include <limits.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <string.h>
53
54 #include <rpc/types.h>
55 #include <rpc/xdr.h>
56 #include "un-namespace.h"
57
58 /*
59 * XDR an array of arbitrary elements
60 * *addrp is a pointer to the array, *sizep is the number of elements.
61 * If addrp is NULL (*sizep * elsize) bytes are allocated.
62 * elsize is the size (in bytes) of each element, and elproc is the
63 * xdr procedure to call to handle each element of the array.
64 */
65 bool_t
xdr_array(XDR * xdrs,caddr_t * addrp,u_int * sizep,u_int maxsize,u_int elsize,xdrproc_t elproc)66 xdr_array(XDR *xdrs, caddr_t *addrp, u_int *sizep, u_int maxsize, u_int elsize, xdrproc_t elproc)
67 /*
68 * XDR *xdrs;
69 * caddr_t *addrp; // array pointer
70 * u_int *sizep; // number of elements
71 * u_int maxsize; // max numberof elements
72 * u_int elsize; // size in bytes of each element
73 * xdrproc_t elproc; // xdr routine to handle each element
74 */
75 {
76 u_int i;
77 caddr_t target = *addrp;
78 u_int c; /* the actual element count */
79 bool_t stat = TRUE;
80 u_int nodesize;
81
82 /* like strings, arrays are really counted arrays */
83 if (!xdr_u_int(xdrs, sizep)) {
84 return (FALSE);
85 }
86 c = *sizep;
87 if ((c > maxsize || UINT_MAX/elsize < c) &&
88 (xdrs->x_op != XDR_FREE)) {
89 return (FALSE);
90 }
91 nodesize = c * elsize;
92
93 /*
94 * if we are deserializing, we may need to allocate an array.
95 * We also save time by checking for a null array if we are freeing.
96 */
97 if (target == NULL)
98 switch (xdrs->x_op) {
99 case XDR_DECODE:
100 if (c == 0)
101 return (TRUE);
102 *addrp = target = mem_alloc(nodesize);
103 if (target == NULL) {
104 warnx("xdr_array: out of memory");
105 return (FALSE);
106 }
107 memset(target, 0, nodesize);
108 break;
109
110 case XDR_FREE:
111 return (TRUE);
112
113 case XDR_ENCODE:
114 break;
115 }
116
117 /*
118 * now we xdr each element of array
119 */
120 for (i = 0; (i < c) && stat; i++) {
121 stat = (*elproc)(xdrs, target);
122 target += elsize;
123 }
124
125 /*
126 * the array may need freeing
127 */
128 if (xdrs->x_op == XDR_FREE) {
129 mem_free(*addrp, nodesize);
130 *addrp = NULL;
131 }
132 return (stat);
133 }
134
135 /*
136 * xdr_vector():
137 *
138 * XDR a fixed length array. Unlike variable-length arrays,
139 * the storage of fixed length arrays is static and unfreeable.
140 * > basep: base of the array
141 * > size: size of the array
142 * > elemsize: size of each element
143 * > xdr_elem: routine to XDR each element
144 */
145 bool_t
xdr_vector(XDR * xdrs,char * basep,u_int nelem,u_int elemsize,xdrproc_t xdr_elem)146 xdr_vector(XDR *xdrs, char *basep, u_int nelem, u_int elemsize, xdrproc_t xdr_elem)
147 {
148 u_int i;
149 char *elptr;
150
151 elptr = basep;
152 for (i = 0; i < nelem; i++) {
153 if (!(*xdr_elem)(xdrs, elptr)) {
154 return(FALSE);
155 }
156 elptr += elemsize;
157 }
158 return(TRUE);
159 }
160