xdr_array.c revision 331722 
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: stable/11/lib/libc/xdr/xdr_array.c 331722 2018-03-29 02:50:57Z eadler $");
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(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 */
146bool_t
147xdr_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