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 177633 2008-03-26 15:23:12Z dfr $");
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
57#define memmove(dst, src, len) bcopy(src, dst, len)
58
59static void xdrmem_destroy(XDR *);
60static bool_t xdrmem_getlong_aligned(XDR *, long *);
61static bool_t xdrmem_putlong_aligned(XDR *, const long *);
62static bool_t xdrmem_getlong_unaligned(XDR *, long *);
63static bool_t xdrmem_putlong_unaligned(XDR *, const long *);
64static bool_t xdrmem_getbytes(XDR *, char *, u_int);
65static bool_t xdrmem_putbytes(XDR *, const char *, u_int);
66/* XXX: w/64-bit pointers, u_int not enough! */
67static u_int xdrmem_getpos(XDR *);
68static bool_t xdrmem_setpos(XDR *, u_int);
69static int32_t *xdrmem_inline_aligned(XDR *, u_int);
70static int32_t *xdrmem_inline_unaligned(XDR *, u_int);
71
72static const struct xdr_ops xdrmem_ops_aligned = {
73 xdrmem_getlong_aligned,
74 xdrmem_putlong_aligned,
75 xdrmem_getbytes,
76 xdrmem_putbytes,
77 xdrmem_getpos,
78 xdrmem_setpos,
79 xdrmem_inline_aligned,
80 xdrmem_destroy
81};
82
83static const struct xdr_ops xdrmem_ops_unaligned = {
84 xdrmem_getlong_unaligned,
85 xdrmem_putlong_unaligned,
86 xdrmem_getbytes,
87 xdrmem_putbytes,
88 xdrmem_getpos,
89 xdrmem_setpos,
90 xdrmem_inline_unaligned,
91 xdrmem_destroy
92};
93
94/*
95 * The procedure xdrmem_create initializes a stream descriptor for a
96 * memory buffer.
97 */
98void
99xdrmem_create(XDR *xdrs, char *addr, u_int size, enum xdr_op op)
100{
101
102 xdrs->x_op = op;
103 xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
104 ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
105 xdrs->x_private = xdrs->x_base = addr;
106 xdrs->x_handy = size;
107}
108
109/*ARGSUSED*/
110static void
111xdrmem_destroy(XDR *xdrs)
112{
113
114}
115
116static bool_t
117xdrmem_getlong_aligned(XDR *xdrs, long *lp)
118{
119
120 if (xdrs->x_handy < sizeof(int32_t))
121 return (FALSE);
122 xdrs->x_handy -= sizeof(int32_t);
123 *lp = ntohl(*(u_int32_t *)xdrs->x_private);
124 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
125 return (TRUE);
126}
127
128static bool_t
129xdrmem_putlong_aligned(XDR *xdrs, const long *lp)
130{
131
132 if (xdrs->x_handy < sizeof(int32_t))
133 return (FALSE);
134 xdrs->x_handy -= sizeof(int32_t);
135 *(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp);
136 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
137 return (TRUE);
138}
139
140static bool_t
141xdrmem_getlong_unaligned(XDR *xdrs, long *lp)
142{
143 u_int32_t l;
144
145 if (xdrs->x_handy < sizeof(int32_t))
146 return (FALSE);
147 xdrs->x_handy -= sizeof(int32_t);
148 memmove(&l, xdrs->x_private, sizeof(int32_t));
149 *lp = ntohl(l);
150 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
151 return (TRUE);
152}
153
154static bool_t
155xdrmem_putlong_unaligned(XDR *xdrs, const long *lp)
156{
157 u_int32_t l;
158
159 if (xdrs->x_handy < sizeof(int32_t))
160 return (FALSE);
161 xdrs->x_handy -= sizeof(int32_t);
162 l = htonl((u_int32_t)*lp);
163 memmove(xdrs->x_private, &l, sizeof(int32_t));
164 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
165 return (TRUE);
166}
167
168static bool_t
169xdrmem_getbytes(XDR *xdrs, char *addr, u_int len)
170{
171
172 if (xdrs->x_handy < len)
173 return (FALSE);
174 xdrs->x_handy -= len;
175 memmove(addr, xdrs->x_private, len);
176 xdrs->x_private = (char *)xdrs->x_private + len;
177 return (TRUE);
178}
179
180static bool_t
181xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len)
182{
183
184 if (xdrs->x_handy < len)
185 return (FALSE);
186 xdrs->x_handy -= len;
187 memmove(xdrs->x_private, addr, len);
188 xdrs->x_private = (char *)xdrs->x_private + len;
189 return (TRUE);
190}
191
192static u_int
193xdrmem_getpos(XDR *xdrs)
194{
195
196 /* XXX w/64-bit pointers, u_int not enough! */
197 return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base);
198}
199
200static bool_t
201xdrmem_setpos(XDR *xdrs, u_int pos)
202{
203 char *newaddr = xdrs->x_base + pos;
204 char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
205
206 if (newaddr > lastaddr)
207 return (FALSE);
208 xdrs->x_private = newaddr;
209 xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */
210 return (TRUE);
211}
212
213static int32_t *
214xdrmem_inline_aligned(XDR *xdrs, u_int len)
215{
216 int32_t *buf = 0;
217
218 if (xdrs->x_handy >= len) {
219 xdrs->x_handy -= len;
220 buf = (int32_t *)xdrs->x_private;
221 xdrs->x_private = (char *)xdrs->x_private + len;
222 }
223 return (buf);
224}
225
226/* ARGSUSED */
227static int32_t *
228xdrmem_inline_unaligned(XDR *xdrs, u_int len)
229{
230
231 return (0);
232}