xdr_array.c revision 273188 
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)
35static char *sccsid2 = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";
36static char *sccsid = "@(#)xdr_array.c	2.1 88/07/29 4.0 RPCSRC";
37#endif
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD: releng/10.1/lib/libc/xdr/xdr_array.c 273188 2014-10-16 22:00:24Z hrs $");
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 */
66bool_t
67xdr_array(xdrs, addrp, sizep, maxsize, elsize, elproc)
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	u_int i;
76	caddr_t target = *addrp;
77	u_int c;  /* the actual element count */
78	bool_t stat = TRUE;
79	u_int nodesize;
80
81	/* like strings, arrays are really counted arrays */
82	if (!xdr_u_int(xdrs, sizep)) {
83		return (FALSE);
84	}
85	c = *sizep;
86	if ((c > maxsize || UINT_MAX/elsize < c) &&
87	    (xdrs->x_op != XDR_FREE)) {
88		return (FALSE);
89	}
90	nodesize = c * elsize;
91
92	/*
93	 * if we are deserializing, we may need to allocate an array.
94	 * We also save time by checking for a null array if we are freeing.
95	 */
96	if (target == NULL)
97		switch (xdrs->x_op) {
98		case XDR_DECODE:
99			if (c == 0)
100				return (TRUE);
101			*addrp = target = mem_alloc(nodesize);
102			if (target == NULL) {
103				warnx("xdr_array: out of memory");
104				return (FALSE);
105			}
106			memset(target, 0, nodesize);
107			break;
108
109		case XDR_FREE:
110			return (TRUE);
111
112		case XDR_ENCODE:
113			break;
114	}
115
116	/*
117	 * now we xdr each element of array
118	 */
119	for (i = 0; (i < c) && stat; i++) {
120		stat = (*elproc)(xdrs, target);
121		target += elsize;
122	}
123
124	/*
125	 * the array may need freeing
126	 */
127	if (xdrs->x_op == XDR_FREE) {
128		mem_free(*addrp, nodesize);
129		*addrp = NULL;
130	}
131	return (stat);
132}
133
134/*
135 * xdr_vector():
136 *
137 * XDR a fixed length array. Unlike variable-length arrays,
138 * the storage of fixed length arrays is static and unfreeable.
139 * > basep: base of the array
140 * > size: size of the array
141 * > elemsize: size of each element
142 * > xdr_elem: routine to XDR each element
143 */
144bool_t
145xdr_vector(xdrs, basep, nelem, elemsize, xdr_elem)
146	XDR *xdrs;
147	char *basep;
148	u_int nelem;
149	u_int elemsize;
150	xdrproc_t xdr_elem;
151{
152	u_int i;
153	char *elptr;
154
155	elptr = basep;
156	for (i = 0; i < nelem; i++) {
157		if (!(*xdr_elem)(xdrs, elptr)) {
158			return(FALSE);
159		}
160		elptr += elemsize;
161	}
162	return(TRUE);
163}
164