xdr_mem.c revision 11669 
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
30#if defined(LIBC_SCCS) && !defined(lint)
31/*static char *sccsid = "from: @(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";*/
32/*static char *sccsid = "from: @(#)xdr_mem.c	2.1 88/07/29 4.0 RPCSRC";*/
33static char *rcsid = "$Id: xdr_mem.c,v 1.2 1995/05/30 05:42:06 rgrimes Exp $";
34#endif
35
36/*
37 * xdr_mem.h, XDR implementation using memory buffers.
38 *
39 * Copyright (C) 1984, Sun Microsystems, Inc.
40 *
41 * If you have some data to be interpreted as external data representation
42 * or to be converted to external data representation in a memory buffer,
43 * then this is the package for you.
44 *
45 */
46
47#include <string.h>
48#include <rpc/types.h>
49#include <rpc/xdr.h>
50#include <netinet/in.h>
51
52static bool_t	xdrmem_getlong();
53static bool_t	xdrmem_putlong();
54static bool_t	xdrmem_getbytes();
55static bool_t	xdrmem_putbytes();
56static u_int	xdrmem_getpos();
57static bool_t	xdrmem_setpos();
58static long *	xdrmem_inline();
59static void	xdrmem_destroy();
60
61static struct	xdr_ops xdrmem_ops = {
62	xdrmem_getlong,
63	xdrmem_putlong,
64	xdrmem_getbytes,
65	xdrmem_putbytes,
66	xdrmem_getpos,
67	xdrmem_setpos,
68	xdrmem_inline,
69	xdrmem_destroy
70};
71
72/*
73 * The procedure xdrmem_create initializes a stream descriptor for a
74 * memory buffer.
75 */
76void
77xdrmem_create(xdrs, addr, size, op)
78	register XDR *xdrs;
79	caddr_t addr;
80	u_int size;
81	enum xdr_op op;
82{
83
84	xdrs->x_op = op;
85	xdrs->x_ops = &xdrmem_ops;
86	xdrs->x_private = xdrs->x_base = addr;
87	xdrs->x_handy = size;
88}
89
90static void
91xdrmem_destroy(/*xdrs*/)
92	/*XDR *xdrs;*/
93{
94}
95
96static bool_t
97xdrmem_getlong(xdrs, lp)
98	register XDR *xdrs;
99	long *lp;
100{
101
102	if ((xdrs->x_handy -= sizeof(long)) < 0)
103		return (FALSE);
104	*lp = (long)ntohl((u_long)(*((long *)(xdrs->x_private))));
105	xdrs->x_private += sizeof(long);
106	return (TRUE);
107}
108
109static bool_t
110xdrmem_putlong(xdrs, lp)
111	register XDR *xdrs;
112	long *lp;
113{
114
115	if ((xdrs->x_handy -= sizeof(long)) < 0)
116		return (FALSE);
117	*(long *)xdrs->x_private = (long)htonl((u_long)(*lp));
118	xdrs->x_private += sizeof(long);
119	return (TRUE);
120}
121
122static bool_t
123xdrmem_getbytes(xdrs, addr, len)
124	register XDR *xdrs;
125	caddr_t addr;
126	register u_int len;
127{
128
129	if ((xdrs->x_handy -= len) < 0)
130		return (FALSE);
131	bcopy(xdrs->x_private, addr, len);
132	xdrs->x_private += len;
133	return (TRUE);
134}
135
136static bool_t
137xdrmem_putbytes(xdrs, addr, len)
138	register XDR *xdrs;
139	caddr_t addr;
140	register u_int len;
141{
142
143	if ((xdrs->x_handy -= len) < 0)
144		return (FALSE);
145	bcopy(addr, xdrs->x_private, len);
146	xdrs->x_private += len;
147	return (TRUE);
148}
149
150static u_int
151xdrmem_getpos(xdrs)
152	register XDR *xdrs;
153{
154
155	return ((u_int)xdrs->x_private - (u_int)xdrs->x_base);
156}
157
158static bool_t
159xdrmem_setpos(xdrs, pos)
160	register XDR *xdrs;
161	u_int pos;
162{
163	register caddr_t newaddr = xdrs->x_base + pos;
164	register caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
165
166	if ((long)newaddr > (long)lastaddr)
167		return (FALSE);
168	xdrs->x_private = newaddr;
169	xdrs->x_handy = (int)lastaddr - (int)newaddr;
170	return (TRUE);
171}
172
173static long *
174xdrmem_inline(xdrs, len)
175	register XDR *xdrs;
176	int len;
177{
178	long *buf = 0;
179
180	if (xdrs->x_handy >= len) {
181		xdrs->x_handy -= len;
182		buf = (long *) xdrs->x_private;
183		xdrs->x_private += len;
184	}
185	return (buf);
186}
187