1 /* $NetBSD: xdr_array.c,v 1.12 2000/01/22 22:19:18 mycroft Exp $ */
2
3 /*-
4 * Copyright (c) 2010, Oracle America, Inc.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above
13 * copyright notice, this list of conditions and the following
14 * disclaimer in the documentation and/or other materials
15 * provided with the distribution.
16 * * Neither the name of the "Oracle America, Inc." nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char *sccsid2 = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";
36 static char *sccsid = "@(#)xdr_array.c 2.1 88/07/29 4.0 RPCSRC";
37 #endif
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
40
41 /*
42 * xdr_array.c, Generic XDR routines impelmentation.
43 *
44 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
45 * arrays. See xdr.h for more info on the interface to xdr.
46 */
47
48 #include "namespace.h"
49 #include <err.h>
50 #include <limits.h>
51 #include <stdio.h>
52 #include <stdlib.h>
53 #include <string.h>
54
55 #include <rpc/types.h>
56 #include <rpc/xdr.h>
57 #include "un-namespace.h"
58
59 /*
60 * XDR an array of arbitrary elements
61 * *addrp is a pointer to the array, *sizep is the number of elements.
62 * If addrp is NULL (*sizep * elsize) bytes are allocated.
63 * elsize is the size (in bytes) of each element, and elproc is the
64 * xdr procedure to call to handle each element of the array.
65 */
66 bool_t
xdr_array(XDR * xdrs,caddr_t * addrp,u_int * sizep,u_int maxsize,u_int elsize,xdrproc_t elproc)67 xdr_array(XDR *xdrs, caddr_t *addrp, u_int *sizep, u_int maxsize, u_int elsize, xdrproc_t elproc)
68 /*
69 * XDR *xdrs;
70 * caddr_t *addrp; // array pointer
71 * u_int *sizep; // number of elements
72 * u_int maxsize; // max numberof elements
73 * u_int elsize; // size in bytes of each element
74 * xdrproc_t elproc; // xdr routine to handle each element
75 */
76 {
77 u_int i;
78 caddr_t target = *addrp;
79 u_int c; /* the actual element count */
80 bool_t stat = TRUE;
81 u_int nodesize;
82
83 /* like strings, arrays are really counted arrays */
84 if (!xdr_u_int(xdrs, sizep)) {
85 return (FALSE);
86 }
87 c = *sizep;
88 if ((c > maxsize || UINT_MAX/elsize < c) &&
89 (xdrs->x_op != XDR_FREE)) {
90 return (FALSE);
91 }
92 nodesize = c * elsize;
93
94 /*
95 * if we are deserializing, we may need to allocate an array.
96 * We also save time by checking for a null array if we are freeing.
97 */
98 if (target == NULL)
99 switch (xdrs->x_op) {
100 case XDR_DECODE:
101 if (c == 0)
102 return (TRUE);
103 *addrp = target = mem_alloc(nodesize);
104 if (target == NULL) {
105 warnx("xdr_array: out of memory");
106 return (FALSE);
107 }
108 memset(target, 0, nodesize);
109 break;
110
111 case XDR_FREE:
112 return (TRUE);
113
114 case XDR_ENCODE:
115 break;
116 }
117
118 /*
119 * now we xdr each element of array
120 */
121 for (i = 0; (i < c) && stat; i++) {
122 stat = (*elproc)(xdrs, target);
123 target += elsize;
124 }
125
126 /*
127 * the array may need freeing
128 */
129 if (xdrs->x_op == XDR_FREE) {
130 mem_free(*addrp, nodesize);
131 *addrp = NULL;
132 }
133 return (stat);
134 }
135
136 /*
137 * xdr_vector():
138 *
139 * XDR a fixed length array. Unlike variable-length arrays,
140 * the storage of fixed length arrays is static and unfreeable.
141 * > basep: base of the array
142 * > size: size of the array
143 * > elemsize: size of each element
144 * > xdr_elem: routine to XDR each element
145 */
146 bool_t
xdr_vector(XDR * xdrs,char * basep,u_int nelem,u_int elemsize,xdrproc_t xdr_elem)147 xdr_vector(XDR *xdrs, char *basep, u_int nelem, u_int elemsize, xdrproc_t xdr_elem)
148 {
149 u_int i;
150 char *elptr;
151
152 elptr = basep;
153 for (i = 0; i < nelem; i++) {
154 if (!(*xdr_elem)(xdrs, elptr)) {
155 return(FALSE);
156 }
157 elptr += elemsize;
158 }
159 return(TRUE);
160 }
161