xref: /dragonfly/lib/libc/xdr/xdr_mem.c (revision 1de703da)
1 /*
2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3  * unrestricted use provided that this legend is included on all tape
4  * media and as a part of the software program in whole or part.  Users
5  * may copy or modify Sun RPC without charge, but are not authorized
6  * to license or distribute it to anyone else except as part of a product or
7  * program developed by the user.
8  *
9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
12  *
13  * Sun RPC is provided with no support and without any obligation on the
14  * part of Sun Microsystems, Inc. to assist in its use, correction,
15  * modification or enhancement.
16  *
17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
19  * OR ANY PART THEREOF.
20  *
21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
22  * or profits or other special, indirect and consequential damages, even if
23  * Sun has been advised of the possibility of such damages.
24  *
25  * Sun Microsystems, Inc.
26  * 2550 Garcia Avenue
27  * Mountain View, California  94043
28  *
29  * @(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro
30  * @(#)xdr_mem.c	2.1 88/07/29 4.0 RPCSRC
31  * $FreeBSD: src/lib/libc/xdr/xdr_mem.c,v 1.8.2.1 2003/03/20 12:59:55 jedgar Exp $
32  * $DragonFly: src/lib/libc/xdr/xdr_mem.c,v 1.2 2003/06/17 04:26:47 dillon Exp $
33  */
34 
35 /*
36  * xdr_mem.h, XDR implementation using memory buffers.
37  *
38  * Copyright (C) 1984, Sun Microsystems, Inc.
39  *
40  * If you have some data to be interpreted as external data representation
41  * or to be converted to external data representation in a memory buffer,
42  * then this is the package for you.
43  *
44  */
45 
46 #include <string.h>
47 #include <rpc/types.h>
48 #include <rpc/xdr.h>
49 #include <netinet/in.h>
50 
51 static bool_t	xdrmem_getlong_aligned();
52 static bool_t	xdrmem_putlong_aligned();
53 static bool_t	xdrmem_getlong_unaligned();
54 static bool_t	xdrmem_putlong_unaligned();
55 static bool_t	xdrmem_getbytes();
56 static bool_t	xdrmem_putbytes();
57 static u_int	xdrmem_getpos(); /* XXX w/64-bit pointers, u_int not enough! */
58 static bool_t	xdrmem_setpos();
59 static int32_t *xdrmem_inline_aligned();
60 static int32_t *xdrmem_inline_unaligned();
61 static void	xdrmem_destroy();
62 
63 static struct	xdr_ops xdrmem_ops_aligned = {
64 	xdrmem_getlong_aligned,
65 	xdrmem_putlong_aligned,
66 	xdrmem_getbytes,
67 	xdrmem_putbytes,
68 	xdrmem_getpos,
69 	xdrmem_setpos,
70 	xdrmem_inline_aligned,
71 	xdrmem_destroy
72 };
73 
74 static struct	xdr_ops xdrmem_ops_unaligned = {
75 	xdrmem_getlong_unaligned,
76 	xdrmem_putlong_unaligned,
77 	xdrmem_getbytes,
78 	xdrmem_putbytes,
79 	xdrmem_getpos,
80 	xdrmem_setpos,
81 	xdrmem_inline_unaligned,
82 	xdrmem_destroy
83 };
84 
85 /*
86  * The procedure xdrmem_create initializes a stream descriptor for a
87  * memory buffer.
88  */
89 void
90 xdrmem_create(xdrs, addr, size, op)
91 	register XDR *xdrs;
92 	caddr_t addr;
93 	u_int size;
94 	enum xdr_op op;
95 {
96 
97 	xdrs->x_op = op;
98 	xdrs->x_ops = ((size_t)addr & (sizeof(int32_t) - 1))
99 		? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
100 	xdrs->x_private = xdrs->x_base = addr;
101 	xdrs->x_handy = size;
102 }
103 
104 static void
105 xdrmem_destroy(/*xdrs*/)
106 	/*XDR *xdrs;*/
107 {
108 
109 }
110 
111 static bool_t
112 xdrmem_getlong_aligned(xdrs, lp)
113 	register XDR *xdrs;
114 	long *lp;
115 {
116 
117 	if (xdrs->x_handy < sizeof(int32_t))
118 		return (FALSE);
119 	xdrs->x_handy -= sizeof(int32_t);
120 	*lp = ntohl(*(int32_t *)(xdrs->x_private));
121 	xdrs->x_private += sizeof(int32_t);
122 	return (TRUE);
123 }
124 
125 static bool_t
126 xdrmem_putlong_aligned(xdrs, lp)
127 	register XDR *xdrs;
128 	long *lp;
129 {
130 
131 	if (xdrs->x_handy < sizeof(int32_t))
132 		return (FALSE);
133 	xdrs->x_handy -= sizeof(int32_t);
134 	*(int32_t *)xdrs->x_private = htonl(*lp);
135 	xdrs->x_private += sizeof(int32_t);
136 	return (TRUE);
137 }
138 
139 static bool_t
140 xdrmem_getlong_unaligned(xdrs, lp)
141 	register XDR *xdrs;
142 	long *lp;
143 {
144 	int32_t l;
145 
146 	if (xdrs->x_handy < sizeof(int32_t))
147 		return (FALSE);
148 	xdrs->x_handy -= sizeof(int32_t);
149 	memcpy(&l, xdrs->x_private, sizeof(int32_t));
150 	*lp = ntohl(l);
151 	xdrs->x_private += sizeof(int32_t);
152 	return (TRUE);
153 }
154 
155 static bool_t
156 xdrmem_putlong_unaligned(xdrs, lp)
157 	register XDR *xdrs;
158 	long *lp;
159 {
160 	int32_t l;
161 
162 	if (xdrs->x_handy < sizeof(int32_t))
163 		return (FALSE);
164 	xdrs->x_handy -= sizeof(int32_t);
165 	l = htonl(*lp);
166 	memcpy(xdrs->x_private, &l, sizeof(int32_t));
167 	xdrs->x_private += sizeof(int32_t);
168 	return (TRUE);
169 }
170 
171 static bool_t
172 xdrmem_getbytes(xdrs, addr, len)
173 	register XDR *xdrs;
174 	caddr_t addr;
175 	register u_int len;
176 {
177 
178 	if (xdrs->x_handy < len)
179 		return (FALSE);
180 	xdrs->x_handy -= len;
181 	memcpy(addr, xdrs->x_private, len);
182 	xdrs->x_private += len;
183 	return (TRUE);
184 }
185 
186 static bool_t
187 xdrmem_putbytes(xdrs, addr, len)
188 	register XDR *xdrs;
189 	caddr_t addr;
190 	register u_int len;
191 {
192 
193 	if (xdrs->x_handy < len)
194 		return (FALSE);
195 	xdrs->x_handy -= len;
196 	memcpy(xdrs->x_private, addr, len);
197 	xdrs->x_private += len;
198 	return (TRUE);
199 }
200 
201 static u_int
202 xdrmem_getpos(xdrs)
203 	register XDR *xdrs;
204 {
205 
206 	/* XXX w/64-bit pointers, u_int not enough! */
207 	return ((u_long)xdrs->x_private - (u_long)xdrs->x_base);
208 }
209 
210 static bool_t
211 xdrmem_setpos(xdrs, pos)
212 	register XDR *xdrs;
213 	u_int pos;
214 {
215 	register caddr_t newaddr = xdrs->x_base + pos;
216 	register caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
217 
218 	if (newaddr > lastaddr)
219 		return (FALSE);
220 	xdrs->x_private = newaddr;
221 	xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */
222 	return (TRUE);
223 }
224 
225 static int32_t *
226 xdrmem_inline_aligned(xdrs, len)
227 	register XDR *xdrs;
228 	int len;
229 {
230 	int32_t *buf = 0;
231 
232 	if (xdrs->x_handy >= len) {
233 		xdrs->x_handy -= len;
234 		buf = (int32_t *) xdrs->x_private;
235 		xdrs->x_private += len;
236 	}
237 	return (buf);
238 }
239 
240 static int32_t *
241 xdrmem_inline_unaligned(xdrs, len)
242 	register XDR *xdrs;
243 	int len;
244 {
245 
246 	return (0);
247 }
248