1 /*
2 * Copyright (c) 2006-2018, RT-Thread Development Team
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Change Logs:
7 * Date Author Notes
8 */
9 /* @(#)xdr_mem.c 2.1 88/07/29 4.0 RPCSRC */
10 /*
11 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
12 * unrestricted use provided that this legend is included on all tape
13 * media and as a part of the software program in whole or part. Users
14 * may copy or modify Sun RPC without charge, but are not authorized
15 * to license or distribute it to anyone else except as part of a product or
16 * program developed by the user.
17 *
18 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
19 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
21 *
22 * Sun RPC is provided with no support and without any obligation on the
23 * part of Sun Microsystems, Inc. to assist in its use, correction,
24 * modification or enhancement.
25 *
26 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
27 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
28 * OR ANY PART THEREOF.
29 *
30 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
31 * or profits or other special, indirect and consequential damages, even if
32 * Sun has been advised of the possibility of such damages.
33 *
34 * Sun Microsystems, Inc.
35 * 2550 Garcia Avenue
36 * Mountain View, California 94043
37 */
38 #if !defined(lint) && defined(SCCSIDS)
39 static char sccsid[] = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
40 #endif
41
42 /*
43 * xdr_mem.h, XDR implementation using memory buffers.
44 *
45 * Copyright (C) 1984, Sun Microsystems, Inc.
46 *
47 * If you have some data to be interpreted as external data representation
48 * or to be converted to external data representation in a memory buffer,
49 * then this is the package for you.
50 *
51 */
52
53 #include <rpc/types.h>
54 #include <rpc/xdr.h>
55 #include <string.h>
56 #include <limits.h>
57
58 static bool_t xdrmem_getlong (XDR *, long *);
59 static bool_t xdrmem_putlong (XDR *, const long *);
60 static bool_t xdrmem_getbytes (XDR *, char *, unsigned int);
61 static bool_t xdrmem_putbytes (XDR *, const char *, unsigned int);
62 static unsigned int xdrmem_getpos (const XDR *);
63 static bool_t xdrmem_setpos (XDR *, unsigned int);
64 static int32_t *xdrmem_inline (XDR *, unsigned int);
65 static void xdrmem_destroy (XDR *);
66
67 static struct xdr_ops xdrmem_ops = {
68 xdrmem_getlong,
69 xdrmem_putlong,
70 xdrmem_getbytes,
71 xdrmem_putbytes,
72 xdrmem_getpos,
73 xdrmem_setpos,
74 xdrmem_inline,
75 xdrmem_destroy,
76 NULL,
77 NULL
78 };
79
80
81 /*
82 * The procedure xdrmem_create initializes a stream descriptor for a
83 * memory buffer.
84 */
85 void
xdrmem_create(XDR * xdrs,const char * addr,unsigned int size,enum xdr_op op)86 xdrmem_create (XDR *xdrs, const char* addr, unsigned int size, enum xdr_op op)
87 {
88 xdrs->x_op = op;
89 xdrs->x_ops = &xdrmem_ops;
90 xdrs->x_private = xdrs->x_base = (char*)addr;
91 xdrs->x_handy = size;
92 }
93
94 static void
xdrmem_destroy(XDR * xdrs)95 xdrmem_destroy (XDR *xdrs)
96 {
97 }
98
99 static bool_t
xdrmem_getlong(XDR * xdrs,long * lp)100 xdrmem_getlong (XDR *xdrs, long *lp)
101 {
102 if (xdrs->x_handy < 4) return FALSE;
103 xdrs->x_handy -= 4;
104
105 *lp = (int32_t) ntohl((*((int32_t *) (xdrs->x_private))));
106 xdrs->x_private += 4;
107 return TRUE;
108 }
109
110 static bool_t
xdrmem_putlong(XDR * xdrs,const long * lp)111 xdrmem_putlong (XDR *xdrs, const long *lp)
112 {
113 if (xdrs->x_handy < 4) return FALSE;
114 xdrs->x_handy -= 4;
115
116 *(int32_t *) xdrs->x_private = htonl(*lp);
117 xdrs->x_private += 4;
118 return (TRUE);
119 }
120
121 static bool_t
xdrmem_getbytes(XDR * xdrs,char * addr,unsigned int len)122 xdrmem_getbytes (XDR *xdrs, char *addr, unsigned int len)
123 {
124 if (xdrs->x_handy < len) return FALSE;
125 xdrs->x_handy -= len;
126 memmove(addr, xdrs->x_private, len);
127 xdrs->x_private += len;
128 return TRUE;
129 }
130
131 static bool_t
xdrmem_putbytes(XDR * xdrs,const char * addr,unsigned int len)132 xdrmem_putbytes (XDR *xdrs, const char *addr, unsigned int len)
133 {
134 if (xdrs->x_handy < len) return FALSE;
135 xdrs->x_handy -= len;
136 memmove(xdrs->x_private, addr, len);
137 xdrs->x_private += len;
138 return (TRUE);
139 }
140
xdrmem_getpos(const XDR * xdrs)141 static unsigned int xdrmem_getpos (const XDR *xdrs)
142 {
143 return ((unsigned long) xdrs->x_private - (unsigned long) xdrs->x_base);
144 }
145
xdrmem_setpos(XDR * xdrs,unsigned int pos)146 static bool_t xdrmem_setpos(XDR *xdrs, unsigned int pos)
147 {
148 register char* newaddr = xdrs->x_base + pos;
149 register char* lastaddr = xdrs->x_private + xdrs->x_handy;
150
151 if ((long) newaddr > (long) lastaddr
152 || (UINT_MAX < LONG_MAX
153 && (long) UINT_MAX < (long) lastaddr - (long) newaddr))
154 return (FALSE);
155 xdrs->x_private = newaddr;
156 xdrs->x_handy = (long) lastaddr - (long) newaddr;
157 return (TRUE);
158 }
159
160 static int32_t *
xdrmem_inline(XDR * xdrs,unsigned int len)161 xdrmem_inline (XDR *xdrs, unsigned int len)
162 {
163 int32_t *buf = 0;
164
165 if (xdrs->x_handy >= len) {
166 xdrs->x_handy -= len;
167 buf = (int32_t *) xdrs->x_private;
168 xdrs->x_private += len;
169 }
170 return (buf);
171 }
172
173