1 /* $NetBSD: xdr_stdio.c,v 1.14 2000/01/22 22:19:19 mycroft Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 2010, Oracle America, Inc.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are
10 * met:
11 *
12 * * Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * * Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer in the documentation and/or other materials
17 * provided with the distribution.
18 * * Neither the name of the "Oracle America, Inc." nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
29 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
33 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #if defined(LIBC_SCCS) && !defined(lint)
37 static char *sccsid2 = "@(#)xdr_stdio.c 1.16 87/08/11 Copyr 1984 Sun Micro";
38 static char *sccsid = "@(#)xdr_stdio.c 2.1 88/07/29 4.0 RPCSRC";
39 #endif
40 /*
41 * xdr_stdio.c, XDR implementation on standard i/o file.
42 *
43 * This set of routines implements a XDR on a stdio stream.
44 * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
45 * from the stream.
46 */
47
48 #include "namespace.h"
49 #include <stdio.h>
50
51 #include <arpa/inet.h>
52 #include <rpc/types.h>
53 #include <rpc/xdr.h>
54 #include "un-namespace.h"
55
56 static void xdrstdio_destroy(XDR *);
57 static bool_t xdrstdio_getlong(XDR *, long *);
58 static bool_t xdrstdio_putlong(XDR *, const long *);
59 static bool_t xdrstdio_getbytes(XDR *, char *, u_int);
60 static bool_t xdrstdio_putbytes(XDR *, const char *, u_int);
61 static u_int xdrstdio_getpos(XDR *);
62 static bool_t xdrstdio_setpos(XDR *, u_int);
63 static int32_t *xdrstdio_inline(XDR *, u_int);
64
65 /*
66 * Ops vector for stdio type XDR
67 */
68 static const struct xdr_ops xdrstdio_ops = {
69 xdrstdio_getlong, /* deseraialize a long int */
70 xdrstdio_putlong, /* seraialize a long int */
71 xdrstdio_getbytes, /* deserialize counted bytes */
72 xdrstdio_putbytes, /* serialize counted bytes */
73 xdrstdio_getpos, /* get offset in the stream */
74 xdrstdio_setpos, /* set offset in the stream */
75 xdrstdio_inline, /* prime stream for inline macros */
76 xdrstdio_destroy /* destroy stream */
77 };
78
79 /*
80 * Initialize a stdio xdr stream.
81 * Sets the xdr stream handle xdrs for use on the stream file.
82 * Operation flag is set to op.
83 */
84 void
xdrstdio_create(XDR * xdrs,FILE * file,enum xdr_op op)85 xdrstdio_create(XDR *xdrs, FILE *file, enum xdr_op op)
86 {
87
88 xdrs->x_op = op;
89 xdrs->x_ops = &xdrstdio_ops;
90 xdrs->x_private = file;
91 xdrs->x_handy = 0;
92 xdrs->x_base = 0;
93 }
94
95 /*
96 * Destroy a stdio xdr stream.
97 * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
98 */
99 static void
xdrstdio_destroy(XDR * xdrs)100 xdrstdio_destroy(XDR *xdrs)
101 {
102 (void)fflush((FILE *)xdrs->x_private);
103 /* XXX: should we close the file ?? */
104 }
105
106 static bool_t
xdrstdio_getlong(XDR * xdrs,long * lp)107 xdrstdio_getlong(XDR *xdrs, long *lp)
108 {
109 u_int32_t temp;
110
111 if (fread(&temp, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
112 return (FALSE);
113 *lp = (long)ntohl(temp);
114 return (TRUE);
115 }
116
117 static bool_t
xdrstdio_putlong(XDR * xdrs,const long * lp)118 xdrstdio_putlong(XDR *xdrs, const long *lp)
119 {
120 int32_t mycopy = htonl((u_int32_t)*lp);
121
122 if (fwrite(&mycopy, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
123 return (FALSE);
124 return (TRUE);
125 }
126
127 static bool_t
xdrstdio_getbytes(XDR * xdrs,char * addr,u_int len)128 xdrstdio_getbytes(XDR *xdrs, char *addr, u_int len)
129 {
130
131 if ((len != 0) && (fread(addr, (size_t)len, 1, (FILE *)xdrs->x_private) != 1))
132 return (FALSE);
133 return (TRUE);
134 }
135
136 static bool_t
xdrstdio_putbytes(XDR * xdrs,const char * addr,u_int len)137 xdrstdio_putbytes(XDR *xdrs, const char *addr, u_int len)
138 {
139
140 if ((len != 0) && (fwrite(addr, (size_t)len, 1,
141 (FILE *)xdrs->x_private) != 1))
142 return (FALSE);
143 return (TRUE);
144 }
145
146 static u_int
xdrstdio_getpos(XDR * xdrs)147 xdrstdio_getpos(XDR *xdrs)
148 {
149
150 return ((u_int) ftell((FILE *)xdrs->x_private));
151 }
152
153 static bool_t
xdrstdio_setpos(XDR * xdrs,u_int pos)154 xdrstdio_setpos(XDR *xdrs, u_int pos)
155 {
156
157 return ((fseek((FILE *)xdrs->x_private, (long)pos, 0) < 0) ?
158 FALSE : TRUE);
159 }
160
161 /* ARGSUSED */
162 static int32_t *
xdrstdio_inline(XDR * xdrs,u_int len)163 xdrstdio_inline(XDR *xdrs, u_int len)
164 {
165
166 /*
167 * Must do some work to implement this: must insure
168 * enough data in the underlying stdio buffer,
169 * that the buffer is aligned so that we can indirect through a
170 * long *, and stuff this pointer in xdrs->x_buf. Doing
171 * a fread or fwrite to a scratch buffer would defeat
172 * most of the gains to be had here and require storage
173 * management on this buffer, so we don't do this.
174 */
175 return (NULL);
176 }
177