1 /* $NetBSD: xdr_stdio.c,v 1.19 2013/03/11 20:19:30 tron Exp $ */
2
3 /*
4 * Copyright (c) 2010, Oracle America, Inc.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above
13 * copyright notice, this list of conditions and the following
14 * disclaimer in the documentation and/or other materials
15 * provided with the distribution.
16 * * Neither the name of the "Oracle America, Inc." nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include <sys/cdefs.h>
35 #if defined(LIBC_SCCS) && !defined(lint)
36 #if 0
37 static char *sccsid = "@(#)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 #else
40 __RCSID("$NetBSD: xdr_stdio.c,v 1.19 2013/03/11 20:19:30 tron Exp $");
41 #endif
42 #endif
43
44 /*
45 * xdr_stdio.c, XDR implementation on standard i/o file.
46 *
47 * Copyright (C) 1984, Sun Microsystems, Inc.
48 *
49 * This set of routines implements a XDR on a stdio stream.
50 * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
51 * from the stream.
52 */
53
54 #include "namespace.h"
55
56 #include <stdio.h>
57
58 #include <rpc/types.h>
59 #include <rpc/xdr.h>
60
61 #ifdef __weak_alias
62 __weak_alias(xdrstdio_create,_xdrstdio_create)
63 #endif
64
65 static void xdrstdio_destroy(XDR *);
66 static bool_t xdrstdio_getlong(XDR *, long *);
67 static bool_t xdrstdio_putlong(XDR *, const long *);
68 static bool_t xdrstdio_getbytes(XDR *, char *, u_int);
69 static bool_t xdrstdio_putbytes(XDR *, const char *, u_int);
70 static u_int xdrstdio_getpos(XDR *);
71 static bool_t xdrstdio_setpos(XDR *, u_int);
72 static int32_t *xdrstdio_inline(XDR *, u_int);
73
74 /*
75 * Ops vector for stdio type XDR
76 */
77 static const struct xdr_ops xdrstdio_ops = {
78 xdrstdio_getlong, /* deseraialize a long int */
79 xdrstdio_putlong, /* seraialize a long int */
80 xdrstdio_getbytes, /* deserialize counted bytes */
81 xdrstdio_putbytes, /* serialize counted bytes */
82 xdrstdio_getpos, /* get offset in the stream */
83 xdrstdio_setpos, /* set offset in the stream */
84 xdrstdio_inline, /* prime stream for inline macros */
85 xdrstdio_destroy, /* destroy stream */
86 NULL, /* xdrstdio_control */
87 };
88
89 /*
90 * Initialize a stdio xdr stream.
91 * Sets the xdr stream handle xdrs for use on the stream file.
92 * Operation flag is set to op.
93 */
94 void
xdrstdio_create(XDR * xdrs,FILE * file,enum xdr_op op)95 xdrstdio_create(XDR *xdrs, FILE *file, enum xdr_op op)
96 {
97
98 xdrs->x_op = op;
99 xdrs->x_ops = &xdrstdio_ops;
100 xdrs->x_private = file;
101 xdrs->x_handy = 0;
102 xdrs->x_base = 0;
103 }
104
105 /*
106 * Destroy a stdio xdr stream.
107 * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
108 */
109 static void
xdrstdio_destroy(XDR * xdrs)110 xdrstdio_destroy(XDR *xdrs)
111 {
112 (void)fflush((FILE *)xdrs->x_private);
113 /* XXX: should we close the file ?? */
114 }
115
116 static bool_t
xdrstdio_getlong(XDR * xdrs,long * lp)117 xdrstdio_getlong(XDR *xdrs, long *lp)
118 {
119 u_int32_t temp;
120
121 if (fread(&temp, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
122 return (FALSE);
123 *lp = (long)ntohl(temp);
124 return (TRUE);
125 }
126
127 static bool_t
xdrstdio_putlong(XDR * xdrs,const long * lp)128 xdrstdio_putlong(XDR *xdrs, const long *lp)
129 {
130 int32_t mycopy = htonl((u_int32_t)*lp);
131
132 if (fwrite(&mycopy, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
133 return (FALSE);
134 return (TRUE);
135 }
136
137 static bool_t
xdrstdio_getbytes(XDR * xdrs,char * addr,u_int len)138 xdrstdio_getbytes(XDR *xdrs, char *addr, u_int len)
139 {
140
141 if ((len != 0) && (fread(addr, (size_t)len, 1, (FILE *)xdrs->x_private) != 1))
142 return (FALSE);
143 return (TRUE);
144 }
145
146 static bool_t
xdrstdio_putbytes(XDR * xdrs,const char * addr,u_int len)147 xdrstdio_putbytes(XDR *xdrs, const char *addr, u_int len)
148 {
149
150 if ((len != 0) && (fwrite(addr, (size_t)len, 1,
151 (FILE *)xdrs->x_private) != 1))
152 return (FALSE);
153 return (TRUE);
154 }
155
156 static u_int
xdrstdio_getpos(XDR * xdrs)157 xdrstdio_getpos(XDR *xdrs)
158 {
159
160 return ((u_int) ftell((FILE *)xdrs->x_private));
161 }
162
163 static bool_t
xdrstdio_setpos(XDR * xdrs,u_int pos)164 xdrstdio_setpos(XDR *xdrs, u_int pos)
165 {
166
167 return ((fseek((FILE *)xdrs->x_private, (long)pos, 0) < 0) ?
168 FALSE : TRUE);
169 }
170
171 /* ARGSUSED */
172 static int32_t *
xdrstdio_inline(XDR * xdrs,u_int len)173 xdrstdio_inline(XDR *xdrs, u_int len)
174 {
175
176 /*
177 * Must do some work to implement this: must insure
178 * enough data in the underlying stdio buffer,
179 * that the buffer is aligned so that we can indirect through a
180 * long *, and stuff this pointer in xdrs->x_buf. Doing
181 * a fread or fwrite to a scratch buffer would defeat
182 * most of the gains to be had here and require storage
183 * management on this buffer, so we don't do this.
184 */
185 return (NULL);
186 }
187