xdr_mem.c revision 273188 
1/*	$NetBSD: xdr_mem.c,v 1.15 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_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
36static char *sccsid = "@(#)xdr_mem.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_mem.c 273188 2014-10-16 22:00:24Z hrs $");
40
41/*
42 * xdr_mem.h, XDR implementation using memory buffers.
43 *
44 * If you have some data to be interpreted as external data representation
45 * or to be converted to external data representation in a memory buffer,
46 * then this is the package for you.
47 *
48 */
49
50#include "namespace.h"
51#include <sys/types.h>
52
53#include <netinet/in.h>
54
55#include <string.h>
56
57#include <rpc/types.h>
58#include <rpc/xdr.h>
59#include "un-namespace.h"
60
61static void xdrmem_destroy(XDR *);
62static bool_t xdrmem_getlong_aligned(XDR *, long *);
63static bool_t xdrmem_putlong_aligned(XDR *, const long *);
64static bool_t xdrmem_getlong_unaligned(XDR *, long *);
65static bool_t xdrmem_putlong_unaligned(XDR *, const long *);
66static bool_t xdrmem_getbytes(XDR *, char *, u_int);
67static bool_t xdrmem_putbytes(XDR *, const char *, u_int);
68/* XXX: w/64-bit pointers, u_int not enough! */
69static u_int xdrmem_getpos(XDR *);
70static bool_t xdrmem_setpos(XDR *, u_int);
71static int32_t *xdrmem_inline_aligned(XDR *, u_int);
72static int32_t *xdrmem_inline_unaligned(XDR *, u_int);
73
74static const struct	xdr_ops xdrmem_ops_aligned = {
75	xdrmem_getlong_aligned,
76	xdrmem_putlong_aligned,
77	xdrmem_getbytes,
78	xdrmem_putbytes,
79	xdrmem_getpos,
80	xdrmem_setpos,
81	xdrmem_inline_aligned,
82	xdrmem_destroy
83};
84
85static const struct	xdr_ops xdrmem_ops_unaligned = {
86	xdrmem_getlong_unaligned,
87	xdrmem_putlong_unaligned,
88	xdrmem_getbytes,
89	xdrmem_putbytes,
90	xdrmem_getpos,
91	xdrmem_setpos,
92	xdrmem_inline_unaligned,
93	xdrmem_destroy
94};
95
96/*
97 * The procedure xdrmem_create initializes a stream descriptor for a
98 * memory buffer.
99 */
100void
101xdrmem_create(xdrs, addr, size, op)
102	XDR *xdrs;
103	char *addr;
104	u_int size;
105	enum xdr_op op;
106{
107
108	xdrs->x_op = op;
109	xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
110	    ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
111	xdrs->x_private = xdrs->x_base = addr;
112	xdrs->x_handy = size;
113}
114
115/*ARGSUSED*/
116static void
117xdrmem_destroy(xdrs)
118	XDR *xdrs;
119{
120
121}
122
123static bool_t
124xdrmem_getlong_aligned(xdrs, lp)
125	XDR *xdrs;
126	long *lp;
127{
128
129	if (xdrs->x_handy < sizeof(int32_t))
130		return (FALSE);
131	xdrs->x_handy -= sizeof(int32_t);
132	*lp = ntohl(*(u_int32_t *)xdrs->x_private);
133	xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
134	return (TRUE);
135}
136
137static bool_t
138xdrmem_putlong_aligned(xdrs, lp)
139	XDR *xdrs;
140	const long *lp;
141{
142
143	if (xdrs->x_handy < sizeof(int32_t))
144		return (FALSE);
145	xdrs->x_handy -= sizeof(int32_t);
146	*(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp);
147	xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
148	return (TRUE);
149}
150
151static bool_t
152xdrmem_getlong_unaligned(xdrs, lp)
153	XDR *xdrs;
154	long *lp;
155{
156	u_int32_t l;
157
158	if (xdrs->x_handy < sizeof(int32_t))
159		return (FALSE);
160	xdrs->x_handy -= sizeof(int32_t);
161	memmove(&l, xdrs->x_private, sizeof(int32_t));
162	*lp = ntohl(l);
163	xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
164	return (TRUE);
165}
166
167static bool_t
168xdrmem_putlong_unaligned(xdrs, lp)
169	XDR *xdrs;
170	const long *lp;
171{
172	u_int32_t l;
173
174	if (xdrs->x_handy < sizeof(int32_t))
175		return (FALSE);
176	xdrs->x_handy -= sizeof(int32_t);
177	l = htonl((u_int32_t)*lp);
178	memmove(xdrs->x_private, &l, sizeof(int32_t));
179	xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
180	return (TRUE);
181}
182
183static bool_t
184xdrmem_getbytes(xdrs, addr, len)
185	XDR *xdrs;
186	char *addr;
187	u_int len;
188{
189
190	if (xdrs->x_handy < len)
191		return (FALSE);
192	xdrs->x_handy -= len;
193	memmove(addr, xdrs->x_private, len);
194	xdrs->x_private = (char *)xdrs->x_private + len;
195	return (TRUE);
196}
197
198static bool_t
199xdrmem_putbytes(xdrs, addr, len)
200	XDR *xdrs;
201	const char *addr;
202	u_int len;
203{
204
205	if (xdrs->x_handy < len)
206		return (FALSE);
207	xdrs->x_handy -= len;
208	memmove(xdrs->x_private, addr, len);
209	xdrs->x_private = (char *)xdrs->x_private + len;
210	return (TRUE);
211}
212
213static u_int
214xdrmem_getpos(xdrs)
215	XDR *xdrs;
216{
217
218	/* XXX w/64-bit pointers, u_int not enough! */
219	return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base);
220}
221
222static bool_t
223xdrmem_setpos(xdrs, pos)
224	XDR *xdrs;
225	u_int pos;
226{
227	char *newaddr = xdrs->x_base + pos;
228	char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
229
230	if (newaddr > lastaddr)
231		return (FALSE);
232	xdrs->x_private = newaddr;
233	xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */
234	return (TRUE);
235}
236
237static int32_t *
238xdrmem_inline_aligned(xdrs, len)
239	XDR *xdrs;
240	u_int len;
241{
242	int32_t *buf = 0;
243
244	if (xdrs->x_handy >= len) {
245		xdrs->x_handy -= len;
246		buf = (int32_t *)xdrs->x_private;
247		xdrs->x_private = (char *)xdrs->x_private + len;
248	}
249	return (buf);
250}
251
252/* ARGSUSED */
253static int32_t *
254xdrmem_inline_unaligned(xdrs, len)
255	XDR *xdrs;
256	u_int len;
257{
258
259	return (0);
260}
261