xref: /freebsd/lib/libc/xdr/xdr_mem.c (revision 5dd76dd0cc19450133aa379ce0ce4a68ae07fb39)
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)
35 static char *sccsid2 = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
36 static char *sccsid = "@(#)xdr_mem.c	2.1 88/07/29 4.0 RPCSRC";
37 #endif
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
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 
61 static void xdrmem_destroy(XDR *);
62 static bool_t xdrmem_getlong_aligned(XDR *, long *);
63 static bool_t xdrmem_putlong_aligned(XDR *, const long *);
64 static bool_t xdrmem_getlong_unaligned(XDR *, long *);
65 static bool_t xdrmem_putlong_unaligned(XDR *, const long *);
66 static bool_t xdrmem_getbytes(XDR *, char *, u_int);
67 static bool_t xdrmem_putbytes(XDR *, const char *, u_int);
68 /* XXX: w/64-bit pointers, u_int not enough! */
69 static u_int xdrmem_getpos(XDR *);
70 static bool_t xdrmem_setpos(XDR *, u_int);
71 static int32_t *xdrmem_inline_aligned(XDR *, u_int);
72 static int32_t *xdrmem_inline_unaligned(XDR *, u_int);
73 
74 static 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 
85 static 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  */
100 void
101 xdrmem_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*/
116 static void
117 xdrmem_destroy(xdrs)
118 	XDR *xdrs;
119 {
120 
121 }
122 
123 static bool_t
124 xdrmem_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 
137 static bool_t
138 xdrmem_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 
151 static bool_t
152 xdrmem_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 
167 static bool_t
168 xdrmem_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 
183 static bool_t
184 xdrmem_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 
198 static bool_t
199 xdrmem_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 
213 static u_int
214 xdrmem_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 
222 static bool_t
223 xdrmem_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 
237 static int32_t *
238 xdrmem_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 */
253 static int32_t *
254 xdrmem_inline_unaligned(xdrs, len)
255 	XDR *xdrs;
256 	u_int len;
257 {
258 
259 	return (0);
260 }
261