rpc.subproj/xdr_stdio.c

   1 /*
   2  * Copyright (c) 1999-2018 Apple 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 "libinfo_common.h"
  61
  62 #include <sys/cdefs.h>
  63
  64 /*
  65  * xdr_stdio.c, XDR implementation on standard i/o file.
  66  *
  67  * Copyright (C) 1984, Sun Microsystems, Inc.
  68  *
  69  * This set of routines implements a XDR on a stdio stream.
  70  * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
  71  * from the stream.
  72  */
  73
  74 #include <stdio.h>
  75
  76 #include <arpa/inet.h>
  77 #include <rpc/types.h>
  78 #include <rpc/xdr.h>
  79
  80 static void xdrstdio_destroy(XDR *);
  81 #ifdef __LP64__
  82 static bool_t xdrstdio_getlong(XDR *, int *);
  83 static bool_t xdrstdio_putlong(XDR *, const int *);
  84 #else
  85 static bool_t xdrstdio_getlong(XDR *, long *);
  86 static bool_t xdrstdio_putlong(XDR *, const long *);
  87 #endif
  88 static bool_t xdrstdio_getbytes(XDR *, char *, u_int);
  89 static bool_t xdrstdio_putbytes(XDR *, const char *, u_int);
  90 static u_int xdrstdio_getpos(XDR *);
  91 static bool_t xdrstdio_setpos(XDR *, u_int);
  92 static int32_t *xdrstdio_inline(XDR *, u_int);
  93
  94 /*
  95  * Ops vector for stdio type XDR
  96  */
  97 static const struct xdr_ops     xdrstdio_ops = {
  98         xdrstdio_getlong,       /* deseraialize a long int */
  99         xdrstdio_putlong,       /* seraialize a long int */
 100         xdrstdio_getbytes,      /* deserialize counted bytes */
 101         xdrstdio_putbytes,      /* serialize counted bytes */
 102         xdrstdio_getpos,        /* get offset in the stream */
 103         xdrstdio_setpos,        /* set offset in the stream */
 104         xdrstdio_inline,        /* prime stream for inline macros */
 105         xdrstdio_destroy        /* destroy stream */
 106 };
 107
 108 /*
 109  * Initialize a stdio xdr stream.
 110  * Sets the xdr stream handle xdrs for use on the stream file.
 111  * Operation flag is set to op.
 112  */
 113 LIBINFO_EXPORT
 114 void
 115 xdrstdio_create(xdrs, file, op)
 116         XDR *xdrs;
 117         FILE *file;
 118         enum xdr_op op;
 119 {
 120         xdrs->x_op = op;
 121         xdrs->x_ops = &xdrstdio_ops;
 122         xdrs->x_private = file;
 123         xdrs->x_handy = 0;
 124         xdrs->x_base = 0;
 125 }
 126
 127 /*
 128  * Destroy a stdio xdr stream.
 129  * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
 130  */
 131 static void
 132 xdrstdio_destroy(xdrs)
 133         XDR *xdrs;
 134 {
 135         (void)fflush((FILE *)xdrs->x_private);
 136         /* XXX: should we close the file ?? */
 137 }
 138
 139 static bool_t
 140 xdrstdio_getlong(xdrs, lp)
 141         XDR *xdrs;
 142 #ifdef __LP64__
 143         int *lp;
 144 #else
 145         long *lp;
 146 #endif
 147 {
 148         u_int32_t temp;
 149
 150         if (fread(&temp, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
 151                 return (FALSE);
 152         *lp = ntohl(temp);
 153         return (TRUE);
 154 }
 155
 156 static bool_t
 157 xdrstdio_putlong(xdrs, lp)
 158         XDR *xdrs;
 159 #ifdef __LP64__
 160         const int *lp;
 161 #else
 162         const long *lp;
 163 #endif
 164 {
 165         int32_t mycopy = htonl(*lp);
 166
 167         if (fwrite(&mycopy, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1) return (FALSE);
 168         return (TRUE);
 169 }
 170
 171 static bool_t
 172 xdrstdio_getbytes(xdrs, addr, len)
 173         XDR *xdrs;
 174         char *addr;
 175         u_int len;
 176 {
 177         size_t flen = len;
 178
 179         if ((len != 0) && (fread(addr, flen, 1, (FILE *)xdrs->x_private) != 1)) return (FALSE);
 180         return (TRUE);
 181 }
 182
 183 static bool_t
 184 xdrstdio_putbytes(xdrs, addr, len)
 185         XDR *xdrs;
 186         const char *addr;
 187         u_int len;
 188 {
 189         size_t flen = len;
 190
 191         if ((len != 0) && (fwrite(addr, flen, 1, (FILE *)xdrs->x_private) != 1)) return (FALSE);
 192         return (TRUE);
 193 }
 194
 195 /* This only works if file offsets are <= UINT32_MAX */
 196 static u_int
 197 xdrstdio_getpos(xdrs)
 198         XDR *xdrs;
 199 {
 200         long offset;
 201         u_int val;
 202
 203         offset = ftell((FILE *)xdrs->x_private);
 204 #ifdef __LP64__
 205         if (offset > UINT32_MAX) return -1;
 206 #endif
 207         val = offset;
 208         return val;
 209 }
 210
 211 /* This only works if file offsets are <= UINT32_MAX */
 212 static bool_t
 213 xdrstdio_setpos(xdrs, pos)
 214         XDR *xdrs;
 215         u_int pos;
 216 {
 217         long offset;
 218
 219         offset = pos;
 220         return ((fseek((FILE *)xdrs->x_private, offset, 0) < 0) ? FALSE : TRUE);
 221 }
 222
 223 /* ARGSUSED */
 224 static int32_t *
 225 xdrstdio_inline(xdrs, len)
 226         XDR *xdrs;
 227         u_int len;
 228 {
 229
 230         /*
 231          * Must do some work to implement this: must insure
 232          * enough data in the underlying stdio buffer,
 233          * that the buffer is aligned so that we can indirect through a
 234          * long *, and stuff this pointer in xdrs->x_buf.  Doing
 235          * a fread or fwrite to a scratch buffer would defeat
 236          * most of the gains to be had here and require storage
 237          * management on this buffer, so we don't do this.
 238          */
 239         return (NULL);
 240 }