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 /*
37 * xdr_stdio.c, XDR implementation on standard i/o file.
38 *
39 * This set of routines implements a XDR on a stdio stream.
40 * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
41 * from the stream.
42 */
43
44 #include "namespace.h"
45 #include <stdio.h>
46
47 #include <arpa/inet.h>
48 #include <rpc/types.h>
49 #include <rpc/xdr.h>
50 #include "un-namespace.h"
51
52 static void xdrstdio_destroy(XDR *);
53 static bool_t xdrstdio_getlong(XDR *, long *);
54 static bool_t xdrstdio_putlong(XDR *, const long *);
55 static bool_t xdrstdio_getbytes(XDR *, char *, u_int);
56 static bool_t xdrstdio_putbytes(XDR *, const char *, u_int);
57 static u_int xdrstdio_getpos(XDR *);
58 static bool_t xdrstdio_setpos(XDR *, u_int);
59 static int32_t *xdrstdio_inline(XDR *, u_int);
60
61 /*
62 * Ops vector for stdio type XDR
63 */
64 static const struct xdr_ops xdrstdio_ops = {
65 xdrstdio_getlong, /* deseraialize a long int */
66 xdrstdio_putlong, /* seraialize a long int */
67 xdrstdio_getbytes, /* deserialize counted bytes */
68 xdrstdio_putbytes, /* serialize counted bytes */
69 xdrstdio_getpos, /* get offset in the stream */
70 xdrstdio_setpos, /* set offset in the stream */
71 xdrstdio_inline, /* prime stream for inline macros */
72 xdrstdio_destroy /* destroy stream */
73 };
74
75 /*
76 * Initialize a stdio xdr stream.
77 * Sets the xdr stream handle xdrs for use on the stream file.
78 * Operation flag is set to op.
79 */
80 void
xdrstdio_create(XDR * xdrs,FILE * file,enum xdr_op op)81 xdrstdio_create(XDR *xdrs, FILE *file, enum xdr_op op)
82 {
83
84 xdrs->x_op = op;
85 xdrs->x_ops = &xdrstdio_ops;
86 xdrs->x_private = file;
87 xdrs->x_handy = 0;
88 xdrs->x_base = 0;
89 }
90
91 /*
92 * Destroy a stdio xdr stream.
93 * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
94 */
95 static void
xdrstdio_destroy(XDR * xdrs)96 xdrstdio_destroy(XDR *xdrs)
97 {
98 (void)fflush((FILE *)xdrs->x_private);
99 /* XXX: should we close the file ?? */
100 }
101
102 static bool_t
xdrstdio_getlong(XDR * xdrs,long * lp)103 xdrstdio_getlong(XDR *xdrs, long *lp)
104 {
105 u_int32_t temp;
106
107 if (fread(&temp, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
108 return (FALSE);
109 *lp = (long)ntohl(temp);
110 return (TRUE);
111 }
112
113 static bool_t
xdrstdio_putlong(XDR * xdrs,const long * lp)114 xdrstdio_putlong(XDR *xdrs, const long *lp)
115 {
116 int32_t mycopy = htonl((u_int32_t)*lp);
117
118 if (fwrite(&mycopy, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
119 return (FALSE);
120 return (TRUE);
121 }
122
123 static bool_t
xdrstdio_getbytes(XDR * xdrs,char * addr,u_int len)124 xdrstdio_getbytes(XDR *xdrs, char *addr, u_int len)
125 {
126
127 if ((len != 0) && (fread(addr, (size_t)len, 1, (FILE *)xdrs->x_private) != 1))
128 return (FALSE);
129 return (TRUE);
130 }
131
132 static bool_t
xdrstdio_putbytes(XDR * xdrs,const char * addr,u_int len)133 xdrstdio_putbytes(XDR *xdrs, const char *addr, u_int len)
134 {
135
136 if ((len != 0) && (fwrite(addr, (size_t)len, 1,
137 (FILE *)xdrs->x_private) != 1))
138 return (FALSE);
139 return (TRUE);
140 }
141
142 static u_int
xdrstdio_getpos(XDR * xdrs)143 xdrstdio_getpos(XDR *xdrs)
144 {
145
146 return ((u_int) ftell((FILE *)xdrs->x_private));
147 }
148
149 static bool_t
xdrstdio_setpos(XDR * xdrs,u_int pos)150 xdrstdio_setpos(XDR *xdrs, u_int pos)
151 {
152
153 return ((fseek((FILE *)xdrs->x_private, (long)pos, 0) < 0) ?
154 FALSE : TRUE);
155 }
156
157 /* ARGSUSED */
158 static int32_t *
xdrstdio_inline(XDR * xdrs,u_int len)159 xdrstdio_inline(XDR *xdrs, u_int len)
160 {
161
162 /*
163 * Must do some work to implement this: must insure
164 * enough data in the underlying stdio buffer,
165 * that the buffer is aligned so that we can indirect through a
166 * long *, and stuff this pointer in xdrs->x_buf. Doing
167 * a fread or fwrite to a scratch buffer would defeat
168 * most of the gains to be had here and require storage
169 * management on this buffer, so we don't do this.
170 */
171 return (NULL);
172 }
173