xdr_mem.c revision 189170 
1/*	$NetBSD: xdr_mem.c,v 1.15 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#if defined(LIBC_SCCS) && !defined(lint)
33static char *sccsid2 = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
34static char *sccsid = "@(#)xdr_mem.c	2.1 88/07/29 4.0 RPCSRC";
35#endif
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: head/sys/xdr/xdr_mem.c 189170 2009-02-28 16:21:25Z ed $");
38
39/*
40 * xdr_mem.h, XDR implementation using memory buffers.
41 *
42 * Copyright (C) 1984, Sun Microsystems, Inc.
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 <sys/param.h>
51#include <sys/systm.h>
52#include <sys/malloc.h>
53
54#include <rpc/types.h>
55#include <rpc/xdr.h>
56
57static void xdrmem_destroy(XDR *);
58static bool_t xdrmem_getlong_aligned(XDR *, long *);
59static bool_t xdrmem_putlong_aligned(XDR *, const long *);
60static bool_t xdrmem_getlong_unaligned(XDR *, long *);
61static bool_t xdrmem_putlong_unaligned(XDR *, const long *);
62static bool_t xdrmem_getbytes(XDR *, char *, u_int);
63static bool_t xdrmem_putbytes(XDR *, const char *, u_int);
64/* XXX: w/64-bit pointers, u_int not enough! */
65static u_int xdrmem_getpos(XDR *);
66static bool_t xdrmem_setpos(XDR *, u_int);
67static int32_t *xdrmem_inline_aligned(XDR *, u_int);
68static int32_t *xdrmem_inline_unaligned(XDR *, u_int);
69
70static const struct	xdr_ops xdrmem_ops_aligned = {
71	xdrmem_getlong_aligned,
72	xdrmem_putlong_aligned,
73	xdrmem_getbytes,
74	xdrmem_putbytes,
75	xdrmem_getpos,
76	xdrmem_setpos,
77	xdrmem_inline_aligned,
78	xdrmem_destroy
79};
80
81static const struct	xdr_ops xdrmem_ops_unaligned = {
82	xdrmem_getlong_unaligned,
83	xdrmem_putlong_unaligned,
84	xdrmem_getbytes,
85	xdrmem_putbytes,
86	xdrmem_getpos,
87	xdrmem_setpos,
88	xdrmem_inline_unaligned,
89	xdrmem_destroy
90};
91
92/*
93 * The procedure xdrmem_create initializes a stream descriptor for a
94 * memory buffer.
95 */
96void
97xdrmem_create(XDR *xdrs, char *addr, u_int size, enum xdr_op op)
98{
99
100	xdrs->x_op = op;
101	xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
102	    ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
103	xdrs->x_private = xdrs->x_base = addr;
104	xdrs->x_handy = size;
105}
106
107/*ARGSUSED*/
108static void
109xdrmem_destroy(XDR *xdrs)
110{
111
112}
113
114static bool_t
115xdrmem_getlong_aligned(XDR *xdrs, long *lp)
116{
117
118	if (xdrs->x_handy < sizeof(int32_t))
119		return (FALSE);
120	xdrs->x_handy -= sizeof(int32_t);
121	*lp = ntohl(*(u_int32_t *)xdrs->x_private);
122	xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
123	return (TRUE);
124}
125
126static bool_t
127xdrmem_putlong_aligned(XDR *xdrs, const long *lp)
128{
129
130	if (xdrs->x_handy < sizeof(int32_t))
131		return (FALSE);
132	xdrs->x_handy -= sizeof(int32_t);
133	*(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp);
134	xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
135	return (TRUE);
136}
137
138static bool_t
139xdrmem_getlong_unaligned(XDR *xdrs, long *lp)
140{
141	u_int32_t l;
142
143	if (xdrs->x_handy < sizeof(int32_t))
144		return (FALSE);
145	xdrs->x_handy -= sizeof(int32_t);
146	memmove(&l, xdrs->x_private, sizeof(int32_t));
147	*lp = ntohl(l);
148	xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
149	return (TRUE);
150}
151
152static bool_t
153xdrmem_putlong_unaligned(XDR *xdrs, const long *lp)
154{
155	u_int32_t l;
156
157	if (xdrs->x_handy < sizeof(int32_t))
158		return (FALSE);
159	xdrs->x_handy -= sizeof(int32_t);
160	l = htonl((u_int32_t)*lp);
161	memmove(xdrs->x_private, &l, sizeof(int32_t));
162	xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
163	return (TRUE);
164}
165
166static bool_t
167xdrmem_getbytes(XDR *xdrs, char *addr, u_int len)
168{
169
170	if (xdrs->x_handy < len)
171		return (FALSE);
172	xdrs->x_handy -= len;
173	memmove(addr, xdrs->x_private, len);
174	xdrs->x_private = (char *)xdrs->x_private + len;
175	return (TRUE);
176}
177
178static bool_t
179xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len)
180{
181
182	if (xdrs->x_handy < len)
183		return (FALSE);
184	xdrs->x_handy -= len;
185	memmove(xdrs->x_private, addr, len);
186	xdrs->x_private = (char *)xdrs->x_private + len;
187	return (TRUE);
188}
189
190static u_int
191xdrmem_getpos(XDR *xdrs)
192{
193
194	/* XXX w/64-bit pointers, u_int not enough! */
195	return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base);
196}
197
198static bool_t
199xdrmem_setpos(XDR *xdrs, u_int pos)
200{
201	char *newaddr = xdrs->x_base + pos;
202	char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
203
204	if (newaddr > lastaddr)
205		return (FALSE);
206	xdrs->x_private = newaddr;
207	xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */
208	return (TRUE);
209}
210
211static int32_t *
212xdrmem_inline_aligned(XDR *xdrs, u_int len)
213{
214	int32_t *buf = 0;
215
216	if (xdrs->x_handy >= len) {
217		xdrs->x_handy -= len;
218		buf = (int32_t *)xdrs->x_private;
219		xdrs->x_private = (char *)xdrs->x_private + len;
220	}
221	return (buf);
222}
223
224/* ARGSUSED */
225static int32_t *
226xdrmem_inline_unaligned(XDR *xdrs, u_int len)
227{
228
229	return (0);
230}
231