rpc.subproj/xdr_stdio.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24
  25 /*      $NetBSD: xdr_stdio.c,v 1.14 2000/01/22 22:19:19 mycroft Exp $   */
  26
  27 /*
  28  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  29  * unrestricted use provided that this legend is included on all tape
  30  * media and as a part of the software program in whole or part.  Users
  31  * may copy or modify Sun RPC without charge, but are not authorized
  32  * to license or distribute it to anyone else except as part of a product or
  33  * program developed by the user.
  34  *
  35  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  36  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  37  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  38  *
  39  * Sun RPC is provided with no support and without any obligation on the
  40  * part of Sun Microsystems, Inc. to assist in its use, correction,
  41  * modification or enhancement.
  42  *
  43  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  44  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  45  * OR ANY PART THEREOF.
  46  *
  47  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  48  * or profits or other special, indirect and consequential damages, even if
  49  * Sun has been advised of the possibility of such damages.
  50  *
  51  * Sun Microsystems, Inc.
  52  * 2550 Garcia Avenue
  53  * Mountain View, California  94043
  54  */
  55
  56 #if defined(LIBC_SCCS) && !defined(lint)
  57 static char *sccsid = "@(#)xdr_stdio.c 1.16 87/08/11 Copyr 1984 Sun Micro";
  58 static char *sccsid = "@(#)xdr_stdio.c  2.1 88/07/29 4.0 RPCSRC";
  59 #endif
  60 #include <sys/cdefs.h>
  61
  62 /*
  63  * xdr_stdio.c, XDR implementation on standard i/o file.
  64  *
  65  * Copyright (C) 1984, Sun Microsystems, Inc.
  66  *
  67  * This set of routines implements a XDR on a stdio stream.
  68  * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
  69  * from the stream.
  70  */
  71
  72 #include <stdio.h>
  73
  74 #include <arpa/inet.h>
  75 #include <rpc/types.h>
  76 #include <rpc/xdr.h>
  77
  78 static void xdrstdio_destroy(XDR *);
  79 static bool_t xdrstdio_getlong(XDR *, long *);
  80 static bool_t xdrstdio_putlong(XDR *, const long *);
  81 static bool_t xdrstdio_getbytes(XDR *, char *, u_int);
  82 static bool_t xdrstdio_putbytes(XDR *, const char *, u_int);
  83 static u_int xdrstdio_getpos(XDR *);
  84 static bool_t xdrstdio_setpos(XDR *, u_int);
  85 static int32_t *xdrstdio_inline(XDR *, u_int);
  86
  87 /*
  88  * Ops vector for stdio type XDR
  89  */
  90 static const struct xdr_ops     xdrstdio_ops = {
  91         xdrstdio_getlong,       /* deseraialize a long int */
  92         xdrstdio_putlong,       /* seraialize a long int */
  93         xdrstdio_getbytes,      /* deserialize counted bytes */
  94         xdrstdio_putbytes,      /* serialize counted bytes */
  95         xdrstdio_getpos,        /* get offset in the stream */
  96         xdrstdio_setpos,        /* set offset in the stream */
  97         xdrstdio_inline,        /* prime stream for inline macros */
  98         xdrstdio_destroy        /* destroy stream */
  99 };
 100
 101 /*
 102  * Initialize a stdio xdr stream.
 103  * Sets the xdr stream handle xdrs for use on the stream file.
 104  * Operation flag is set to op.
 105  */
 106 void
 107 xdrstdio_create(xdrs, file, op)
 108         XDR *xdrs;
 109         FILE *file;
 110         enum xdr_op op;
 111 {
 112
 113         xdrs->x_op = op;
 114         xdrs->x_ops = &xdrstdio_ops;
 115         xdrs->x_private = file;
 116         xdrs->x_handy = 0;
 117         xdrs->x_base = 0;
 118 }
 119
 120 /*
 121  * Destroy a stdio xdr stream.
 122  * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
 123  */
 124 static void
 125 xdrstdio_destroy(xdrs)
 126         XDR *xdrs;
 127 {
 128         (void)fflush((FILE *)xdrs->x_private);
 129                 /* XXX: should we close the file ?? */
 130 }
 131
 132 static bool_t
 133 xdrstdio_getlong(xdrs, lp)
 134         XDR *xdrs;
 135         long *lp;
 136 {
 137         u_int32_t temp;
 138
 139         if (fread(&temp, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
 140                 return (FALSE);
 141         *lp = (long)ntohl(temp);
 142         return (TRUE);
 143 }
 144
 145 static bool_t
 146 xdrstdio_putlong(xdrs, lp)
 147         XDR *xdrs;
 148         const long *lp;
 149 {
 150         int32_t mycopy = htonl((u_int32_t)*lp);
 151
 152         if (fwrite(&mycopy, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
 153                 return (FALSE);
 154         return (TRUE);
 155 }
 156
 157 static bool_t
 158 xdrstdio_getbytes(xdrs, addr, len)
 159         XDR *xdrs;
 160         char *addr;
 161         u_int len;
 162 {
 163
 164         if ((len != 0) && (fread(addr, (size_t)len, 1, (FILE *)xdrs->x_private) != 1))
 165                 return (FALSE);
 166         return (TRUE);
 167 }
 168
 169 static bool_t
 170 xdrstdio_putbytes(xdrs, addr, len)
 171         XDR *xdrs;
 172         const char *addr;
 173         u_int len;
 174 {
 175
 176         if ((len != 0) && (fwrite(addr, (size_t)len, 1,
 177             (FILE *)xdrs->x_private) != 1))
 178                 return (FALSE);
 179         return (TRUE);
 180 }
 181
 182 static u_int
 183 xdrstdio_getpos(xdrs)
 184         XDR *xdrs;
 185 {
 186
 187         return ((u_int) ftell((FILE *)xdrs->x_private));
 188 }
 189
 190 static bool_t
 191 xdrstdio_setpos(xdrs, pos)
 192         XDR *xdrs;
 193         u_int pos;
 194 {
 195
 196         return ((fseek((FILE *)xdrs->x_private, (long)pos, 0) < 0) ?
 197                 FALSE : TRUE);
 198 }
 199
 200 /* ARGSUSED */
 201 static int32_t *
 202 xdrstdio_inline(xdrs, len)
 203         XDR *xdrs;
 204         u_int len;
 205 {
 206
 207         /*
 208          * Must do some work to implement this: must insure
 209          * enough data in the underlying stdio buffer,
 210          * that the buffer is aligned so that we can indirect through a
 211          * long *, and stuff this pointer in xdrs->x_buf.  Doing
 212          * a fread or fwrite to a scratch buffer would defeat
 213          * most of the gains to be had here and require storage
 214          * management on this buffer, so we don't do this.
 215          */
 216         return (NULL);
 217 }