1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
27/*	  All Rights Reserved  	*/
28
29/*
30 * Portions of this source code were derived from Berkeley 4.3 BSD
31 * under license from the Regents of the University of California.
32 */
33
34/*
35 * xdr_array.c, Generic XDR routines impelmentation.
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#include <sys/param.h>
41#include <sys/cmn_err.h>
42#include <sys/types.h>
43#include <sys/systm.h>
44
45#include <rpc/types.h>
46#include <rpc/xdr.h>
47
48#define	LASTUNSIGNED	((uint_t)0-1)
49
50/*
51 * XDR an array of arbitrary elements
52 * *addrp is a pointer to the array, *sizep is the number of elements.
53 * If addrp is NULL (*sizep * elsize) bytes are allocated.
54 * elsize is the size (in bytes) of each element, and elproc is the
55 * xdr procedure to call to handle each element of the array.
56 */
57bool_t
58xdr_array(XDR *xdrs, caddr_t *addrp, uint_t *sizep, const uint_t maxsize,
59	const uint_t elsize, const xdrproc_t elproc)
60{
61	uint_t i;
62	caddr_t target = *addrp;
63	uint_t c;  /* the actual element count */
64	bool_t stat = TRUE;
65	uint_t nodesize;
66
67	/* like strings, arrays are really counted arrays */
68	if (!xdr_u_int(xdrs, sizep)) {
69		return (FALSE);
70	}
71	c = *sizep;
72	if ((c > maxsize || LASTUNSIGNED / elsize < c) &&
73	    xdrs->x_op != XDR_FREE) {
74		return (FALSE);
75	}
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 = (char *)mem_alloc(nodesize);
88			bzero(target, nodesize);
89			break;
90
91		case XDR_FREE:
92			return (TRUE);
93
94		case XDR_ENCODE:
95			break;
96		}
97
98	/*
99	 * now we xdr each element of array
100	 */
101	for (i = 0; (i < c) && stat; i++) {
102		stat = (*elproc)(xdrs, target, LASTUNSIGNED);
103		target += elsize;
104	}
105
106	/*
107	 * the array may need freeing
108	 */
109	if (xdrs->x_op == XDR_FREE) {
110		mem_free(*addrp, nodesize);
111		*addrp = NULL;
112	}
113	return (stat);
114}
115