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 #ifdef __LP64__
  80 static bool_t xdrstdio_getlong(XDR *, int *);
  81 static bool_t xdrstdio_putlong(XDR *, const int *);
  82 #else
  83 static bool_t xdrstdio_getlong(XDR *, long *);
  84 static bool_t xdrstdio_putlong(XDR *, const long *);
  85 #endif
  86 static bool_t xdrstdio_getbytes(XDR *, char *, u_int);
  87 static bool_t xdrstdio_putbytes(XDR *, const char *, u_int);
  88 static u_int xdrstdio_getpos(XDR *);
  89 static bool_t xdrstdio_setpos(XDR *, u_int);
  90 static int32_t *xdrstdio_inline(XDR *, u_int);
  91
  92 /*
  93  * Ops vector for stdio type XDR
  94  */
  95 static const struct xdr_ops     xdrstdio_ops = {
  96         xdrstdio_getlong,       /* deseraialize a long int */
  97         xdrstdio_putlong,       /* seraialize a long int */
  98         xdrstdio_getbytes,      /* deserialize counted bytes */
  99         xdrstdio_putbytes,      /* serialize counted bytes */
 100         xdrstdio_getpos,        /* get offset in the stream */
 101         xdrstdio_setpos,        /* set offset in the stream */
 102         xdrstdio_inline,        /* prime stream for inline macros */
 103         xdrstdio_destroy        /* destroy stream */
 104 };
 105
 106 /*
 107  * Initialize a stdio xdr stream.
 108  * Sets the xdr stream handle xdrs for use on the stream file.
 109  * Operation flag is set to op.
 110  */
 111 void
 112 xdrstdio_create(xdrs, file, op)
 113         XDR *xdrs;
 114         FILE *file;
 115         enum xdr_op op;
 116 {
 117         xdrs->x_op = op;
 118         xdrs->x_ops = &xdrstdio_ops;
 119         xdrs->x_private = file;
 120         xdrs->x_handy = 0;
 121         xdrs->x_base = 0;
 122 }
 123
 124 /*
 125  * Destroy a stdio xdr stream.
 126  * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
 127  */
 128 static void
 129 xdrstdio_destroy(xdrs)
 130         XDR *xdrs;
 131 {
 132         (void)fflush((FILE *)xdrs->x_private);
 133         /* XXX: should we close the file ?? */
 134 }
 135
 136 static bool_t
 137 xdrstdio_getlong(xdrs, lp)
 138         XDR *xdrs;
 139 #ifdef __LP64__
 140         int *lp;
 141 #else
 142         long *lp;
 143 #endif
 144 {
 145         u_int32_t temp;
 146
 147         if (fread(&temp, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
 148                 return (FALSE);
 149         *lp = ntohl(temp);
 150         return (TRUE);
 151 }
 152
 153 static bool_t
 154 xdrstdio_putlong(xdrs, lp)
 155         XDR *xdrs;
 156 #ifdef __LP64__
 157         const int *lp;
 158 #else
 159         const long *lp;
 160 #endif
 161 {
 162         int32_t mycopy = htonl(*lp);
 163
 164         if (fwrite(&mycopy, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1) return (FALSE);
 165         return (TRUE);
 166 }
 167
 168 static bool_t
 169 xdrstdio_getbytes(xdrs, addr, len)
 170         XDR *xdrs;
 171         char *addr;
 172         u_int len;
 173 {
 174         size_t flen = len;
 175
 176         if ((len != 0) && (fread(addr, flen, 1, (FILE *)xdrs->x_private) != 1)) return (FALSE);
 177         return (TRUE);
 178 }
 179
 180 static bool_t
 181 xdrstdio_putbytes(xdrs, addr, len)
 182         XDR *xdrs;
 183         const char *addr;
 184         u_int len;
 185 {
 186         size_t flen = len;
 187
 188         if ((len != 0) && (fwrite(addr, flen, 1, (FILE *)xdrs->x_private) != 1)) return (FALSE);
 189         return (TRUE);
 190 }
 191
 192 /* This only works if file offsets are <= UINT32_MAX */
 193 static u_int
 194 xdrstdio_getpos(xdrs)
 195         XDR *xdrs;
 196 {
 197         long offset;
 198         u_int val;
 199
 200         offset = ftell((FILE *)xdrs->x_private);
 201 #ifdef __LP64__
 202         if (offset > UINT32_MAX) return -1;
 203 #endif
 204         val = offset;
 205         return val;
 206 }
 207
 208 /* This only works if file offsets are <= UINT32_MAX */
 209 static bool_t
 210 xdrstdio_setpos(xdrs, pos)
 211         XDR *xdrs;
 212         u_int pos;
 213 {
 214         long offset;
 215
 216         offset = pos;
 217         return ((fseek((FILE *)xdrs->x_private, offset, 0) < 0) ? FALSE : TRUE);
 218 }
 219
 220 /* ARGSUSED */
 221 static int32_t *
 222 xdrstdio_inline(xdrs, len)
 223         XDR *xdrs;
 224         u_int len;
 225 {
 226
 227         /*
 228          * Must do some work to implement this: must insure
 229          * enough data in the underlying stdio buffer,
 230          * that the buffer is aligned so that we can indirect through a
 231          * long *, and stuff this pointer in xdrs->x_buf.  Doing
 232          * a fread or fwrite to a scratch buffer would defeat
 233          * most of the gains to be had here and require storage
 234          * management on this buffer, so we don't do this.
 235          */
 236         return (NULL);
 237 }