1/*	$NetBSD: xdr_array.c,v 1.12 2000/01/22 22:19:18 mycroft Exp $	*/
2
3/*
4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5 * unrestricted use provided that this legend is included on all tape
6 * media and as a part of the software program in whole or part.  Users
7 * may copy or modify Sun RPC without charge, but are not authorized
8 * to license or distribute it to anyone else except as part of a product or
9 * program developed by the user.
10 *
11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14 *
15 * Sun RPC is provided with no support and without any obligation on the
16 * part of Sun Microsystems, Inc. to assist in its use, correction,
17 * modification or enhancement.
18 *
19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21 * OR ANY PART THEREOF.
22 *
23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24 * or profits or other special, indirect and consequential damages, even if
25 * Sun has been advised of the possibility of such damages.
26 *
27 * Sun Microsystems, Inc.
28 * 2550 Garcia Avenue
29 * Mountain View, California  94043
30 */
31
32#include <sys/cdefs.h>
33/*
34 * xdr_array.c, Generic XDR routines implementation.
35 *
36 * Copyright (C) 1984, Sun Microsystems, Inc.
37 *
38 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
39 * arrays.  See xdr.h for more info on the interface to xdr.
40 */
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/limits.h>
45#include <sys/malloc.h>
46
47#include <rpc/types.h>
48#include <rpc/xdr.h>
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,
59    caddr_t *addrp,		/* array pointer */
60    u_int *sizep,		/* number of elements */
61    u_int maxsize,		/* max numberof elements */
62    u_int elsize,		/* size in bytes of each element */
63    xdrproc_t elproc)		/* xdr routine to handle each element */
64{
65	u_int i;
66	caddr_t target = *addrp;
67	u_int c;  /* the actual element count */
68	bool_t stat = TRUE;
69	u_int nodesize;
70
71	/* like strings, arrays are really counted arrays */
72	if (!xdr_u_int(xdrs, sizep)) {
73		return (FALSE);
74	}
75	c = *sizep;
76	if ((c > maxsize || UINT_MAX/elsize < c) &&
77	    (xdrs->x_op != XDR_FREE)) {
78		return (FALSE);
79	}
80	nodesize = c * elsize;
81
82	/*
83	 * if we are deserializing, we may need to allocate an array.
84	 * We also save time by checking for a null array if we are freeing.
85	 */
86	if (target == NULL)
87		switch (xdrs->x_op) {
88		case XDR_DECODE:
89			if (c == 0)
90				return (TRUE);
91			*addrp = target = mem_alloc(nodesize);
92			if (target == NULL) {
93				printf("xdr_array: out of memory");
94				return (FALSE);
95			}
96			memset(target, 0, nodesize);
97			break;
98
99		case XDR_FREE:
100			return (TRUE);
101
102		case XDR_ENCODE:
103			break;
104	}
105
106	/*
107	 * now we xdr each element of array
108	 */
109	for (i = 0; (i < c) && stat; i++) {
110		stat = (*elproc)(xdrs, target);
111		target += elsize;
112	}
113
114	/*
115	 * the array may need freeing
116	 */
117	if (xdrs->x_op == XDR_FREE) {
118		mem_free(*addrp, nodesize);
119		*addrp = NULL;
120	}
121	return (stat);
122}
123
124/*
125 * xdr_vector():
126 *
127 * XDR a fixed length array. Unlike variable-length arrays,
128 * the storage of fixed length arrays is static and unfreeable.
129 * > basep: base of the array
130 * > size: size of the array
131 * > elemsize: size of each element
132 * > xdr_elem: routine to XDR each element
133 */
134bool_t
135xdr_vector(XDR *xdrs, char *basep, u_int nelem, u_int elemsize,
136    xdrproc_t xdr_elem)
137{
138	u_int i;
139	char *elptr;
140
141	elptr = basep;
142	for (i = 0; i < nelem; i++) {
143		if (!(*xdr_elem)(xdrs, elptr)) {
144			return(FALSE);
145		}
146		elptr += elemsize;
147	}
148	return(TRUE);
149}
150