1 /* @(#)xdr_mem.c 2.1 88/07/29 4.0 RPCSRC */
2 /*
3 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
4 * unrestricted use provided that this legend is included on all tape
5 * media and as a part of the software program in whole or part. Users
6 * may copy or modify Sun RPC without charge, but are not authorized
7 * to license or distribute it to anyone else except as part of a product or
8 * program developed by the user.
9 *
10 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
11 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
12 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
13 *
14 * Sun RPC is provided with no support and without any obligation on the
15 * part of Sun Microsystems, Inc. to assist in its use, correction,
16 * modification or enhancement.
17 *
18 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
19 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
20 * OR ANY PART THEREOF.
21 *
22 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
23 * or profits or other special, indirect and consequential damages, even if
24 * Sun has been advised of the possibility of such damages.
25 *
26 * Sun Microsystems, Inc.
27 * 2550 Garcia Avenue
28 * Mountain View, California 94043
29 */
30 #if !defined(lint) && defined(SCCSIDS)
31 static char sccsid[] = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
32 #endif
33
34 /*
35 * xdr_mem.h, XDR implementation using memory buffers.
36 *
37 * Copyright (C) 1984, Sun Microsystems, Inc.
38 *
39 * If you have some data to be interpreted as external data representation
40 * or to be converted to external data representation in a memory buffer,
41 * then this is the package for you.
42 *
43 */
44
45
46 #include <rpc/types.h>
47 #include <rpc/xdr.h>
48 #include <netinet/in.h>
49
50 static bool_t xdrmem_getlong();
51 static bool_t xdrmem_putlong();
52 static bool_t xdrmem_getbytes();
53 static bool_t xdrmem_putbytes();
54 static u_int xdrmem_getpos();
55 static bool_t xdrmem_setpos();
56 static long * xdrmem_inline();
57 static void xdrmem_destroy();
58
59 static struct xdr_ops xdrmem_ops = {
60 xdrmem_getlong,
61 xdrmem_putlong,
62 xdrmem_getbytes,
63 xdrmem_putbytes,
64 xdrmem_getpos,
65 xdrmem_setpos,
66 xdrmem_inline,
67 xdrmem_destroy
68 };
69
70 /*
71 * The procedure xdrmem_create initializes a stream descriptor for a
72 * memory buffer.
73 */
74 void
xdrmem_create(xdrs,addr,size,op)75 xdrmem_create(xdrs, addr, size, op)
76 register XDR *xdrs;
77 caddr_t addr;
78 u_int size;
79 enum xdr_op op;
80 {
81
82 xdrs->x_op = op;
83 xdrs->x_ops = &xdrmem_ops;
84 xdrs->x_private = xdrs->x_base = addr;
85 xdrs->x_handy = size;
86 }
87
88 static void
xdrmem_destroy()89 xdrmem_destroy(/*xdrs*/)
90 /*XDR *xdrs;*/
91 {
92 }
93
94 static bool_t
xdrmem_getlong(xdrs,lp)95 xdrmem_getlong(xdrs, lp)
96 register XDR *xdrs;
97 long *lp;
98 {
99
100 if ((xdrs->x_handy -= sizeof(long)) < 0)
101 return (FALSE);
102 *lp = (long)ntohl((u_long)(*((long *)(xdrs->x_private))));
103 xdrs->x_private += sizeof(long);
104 return (TRUE);
105 }
106
107 static bool_t
xdrmem_putlong(xdrs,lp)108 xdrmem_putlong(xdrs, lp)
109 register XDR *xdrs;
110 long *lp;
111 {
112
113 if ((xdrs->x_handy -= sizeof(long)) < 0)
114 return (FALSE);
115 *(long *)xdrs->x_private = (long)htonl((u_long)(*lp));
116 xdrs->x_private += sizeof(long);
117 return (TRUE);
118 }
119
120 static bool_t
xdrmem_getbytes(xdrs,addr,len)121 xdrmem_getbytes(xdrs, addr, len)
122 register XDR *xdrs;
123 caddr_t addr;
124 register u_int len;
125 {
126
127 if ((xdrs->x_handy -= len) < 0)
128 return (FALSE);
129 bcopy(xdrs->x_private, addr, len);
130 xdrs->x_private += len;
131 return (TRUE);
132 }
133
134 static bool_t
xdrmem_putbytes(xdrs,addr,len)135 xdrmem_putbytes(xdrs, addr, len)
136 register XDR *xdrs;
137 caddr_t addr;
138 register u_int len;
139 {
140
141 if ((xdrs->x_handy -= len) < 0)
142 return (FALSE);
143 bcopy(addr, xdrs->x_private, len);
144 xdrs->x_private += len;
145 return (TRUE);
146 }
147
148 static u_int
xdrmem_getpos(xdrs)149 xdrmem_getpos(xdrs)
150 register XDR *xdrs;
151 {
152
153 return ((u_int)xdrs->x_private - (u_int)xdrs->x_base);
154 }
155
156 static bool_t
xdrmem_setpos(xdrs,pos)157 xdrmem_setpos(xdrs, pos)
158 register XDR *xdrs;
159 u_int pos;
160 {
161 register caddr_t newaddr = xdrs->x_base + pos;
162 register caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
163
164 if ((long)newaddr > (long)lastaddr)
165 return (FALSE);
166 xdrs->x_private = newaddr;
167 xdrs->x_handy = (int)lastaddr - (int)newaddr;
168 return (TRUE);
169 }
170
171 static long *
xdrmem_inline(xdrs,len)172 xdrmem_inline(xdrs, len)
173 register XDR *xdrs;
174 int len;
175 {
176 long *buf = 0;
177
178 if (xdrs->x_handy >= len) {
179 xdrs->x_handy -= len;
180 buf = (long *) xdrs->x_private;
181 xdrs->x_private += len;
182 }
183 return (buf);
184 }
185