rpc.subproj/xdr_mem.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_mem.c,v 1.15 2000/01/22 22:19:18 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_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
  58 static char *sccsid = "@(#)xdr_mem.c    2.1 88/07/29 4.0 RPCSRC";
  59 #endif
  60 #include <sys/cdefs.h>
  61
  62 /*
  63  * xdr_mem.h, XDR implementation using memory buffers.
  64  *
  65  * Copyright (C) 1984, Sun Microsystems, Inc.
  66  *
  67  * If you have some data to be interpreted as external data representation
  68  * or to be converted to external data representation in a memory buffer,
  69  * then this is the package for you.
  70  *
  71  */
  72
  73 #include <sys/types.h>
  74 #include <stddef.h>
  75
  76 #include <netinet/in.h>
  77
  78 #include <string.h>
  79
  80 #include <rpc/types.h>
  81 #include <rpc/xdr.h>
  82
  83 #ifdef __LP64__
  84 #define xdrlong_t int
  85 #else
  86 #define xdrlong_t long
  87 #endif
  88
  89 static void xdrmem_destroy(XDR *);
  90 static bool_t xdrmem_getlong_aligned(XDR *, xdrlong_t *);
  91 static bool_t xdrmem_putlong_aligned(XDR *, const xdrlong_t *);
  92 static bool_t xdrmem_getlong_unaligned(XDR *, xdrlong_t *);
  93 static bool_t xdrmem_putlong_unaligned(XDR *, const xdrlong_t *);
  94 static bool_t xdrmem_getbytes(XDR *, char *, u_int);
  95 static bool_t xdrmem_putbytes(XDR *, const char *, u_int);
  96 /* XXX: w/64-bit pointers, u_int not enough! */
  97 static u_int xdrmem_getpos(XDR *);
  98 static bool_t xdrmem_setpos(XDR *, u_int);
  99 static int32_t *xdrmem_inline_aligned(XDR *, u_int);
 100 static int32_t *xdrmem_inline_unaligned(XDR *, u_int);
 101
 102 static const struct     xdr_ops xdrmem_ops_aligned = {
 103         xdrmem_getlong_aligned,
 104         xdrmem_putlong_aligned,
 105         xdrmem_getbytes,
 106         xdrmem_putbytes,
 107         xdrmem_getpos,
 108         xdrmem_setpos,
 109         xdrmem_inline_aligned,
 110         xdrmem_destroy
 111 };
 112
 113 static const struct     xdr_ops xdrmem_ops_unaligned = {
 114         xdrmem_getlong_unaligned,
 115         xdrmem_putlong_unaligned,
 116         xdrmem_getbytes,
 117         xdrmem_putbytes,
 118         xdrmem_getpos,
 119         xdrmem_setpos,
 120         xdrmem_inline_unaligned,
 121         xdrmem_destroy
 122 };
 123
 124 /*
 125  * The procedure xdrmem_create initializes a stream descriptor for a
 126  * memory buffer.
 127  */
 128 void
 129 xdrmem_create(xdrs, addr, size, op)
 130         XDR *xdrs;
 131         char *addr;
 132         u_int size;
 133         enum xdr_op op;
 134 {
 135         xdrs->x_op = op;
 136         xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
 137             ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
 138         xdrs->x_private = xdrs->x_base = addr;
 139         xdrs->x_handy = size;
 140 }
 141
 142 /*ARGSUSED*/
 143 static void
 144 xdrmem_destroy(xdrs)
 145         XDR *xdrs;
 146 {
 147 }
 148
 149 static bool_t
 150 xdrmem_getlong_aligned(xdrs, lp)
 151         XDR *xdrs;
 152         xdrlong_t *lp;
 153 {
 154         if (xdrs->x_handy < sizeof(int32_t))
 155                 return (FALSE);
 156         xdrs->x_handy -= sizeof(int32_t);
 157         *lp = ntohl(*(u_int32_t *)xdrs->x_private);
 158         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 159         return (TRUE);
 160 }
 161
 162 static bool_t
 163 xdrmem_putlong_aligned(xdrs, lp)
 164         XDR *xdrs;
 165         const xdrlong_t *lp;
 166 {
 167         if (xdrs->x_handy < sizeof(int32_t))
 168                 return (FALSE);
 169         xdrs->x_handy -= sizeof(int32_t);
 170         *(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp);
 171         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 172         return (TRUE);
 173 }
 174
 175 static bool_t
 176 xdrmem_getlong_unaligned(xdrs, lp)
 177         XDR *xdrs;
 178         xdrlong_t *lp;
 179 {
 180         u_int32_t l;
 181
 182         if (xdrs->x_handy < sizeof(int32_t))
 183                 return (FALSE);
 184         xdrs->x_handy -= sizeof(int32_t);
 185         memmove(&l, xdrs->x_private, sizeof(int32_t));
 186         *lp = ntohl(l);
 187         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 188         return (TRUE);
 189 }
 190
 191 static bool_t
 192 xdrmem_putlong_unaligned(xdrs, lp)
 193         XDR *xdrs;
 194         const xdrlong_t *lp;
 195 {
 196         u_int32_t l;
 197
 198         if (xdrs->x_handy < sizeof(int32_t))
 199                 return (FALSE);
 200         xdrs->x_handy -= sizeof(int32_t);
 201         l = htonl((u_int32_t)*lp);
 202         memmove(xdrs->x_private, &l, sizeof(int32_t));
 203         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 204         return (TRUE);
 205 }
 206
 207 static bool_t
 208 xdrmem_getbytes(xdrs, addr, len)
 209         XDR *xdrs;
 210         char *addr;
 211         u_int len;
 212 {
 213         if (xdrs->x_handy < len)
 214                 return (FALSE);
 215         xdrs->x_handy -= len;
 216         memmove(addr, xdrs->x_private, len);
 217         xdrs->x_private = (char *)xdrs->x_private + len;
 218         return (TRUE);
 219 }
 220
 221 static bool_t
 222 xdrmem_putbytes(xdrs, addr, len)
 223         XDR *xdrs;
 224         const char *addr;
 225         u_int len;
 226 {
 227         if (xdrs->x_handy < len)
 228                 return (FALSE);
 229         xdrs->x_handy -= len;
 230         memmove(xdrs->x_private, addr, len);
 231         xdrs->x_private = (char *)xdrs->x_private + len;
 232         return (TRUE);
 233 }
 234
 235 static u_int
 236 xdrmem_getpos(xdrs)
 237         XDR *xdrs;
 238 {
 239         ptrdiff_t delta;
 240         u_int val;
 241
 242         delta = xdrs->x_private - (void *)(xdrs->x_base);
 243 #ifdef __LP64__
 244         if (delta > UINT32_MAX) return -1;
 245 #endif
 246
 247         val = delta;
 248         return val;
 249 }
 250
 251 static bool_t
 252 xdrmem_setpos(xdrs, pos)
 253         XDR *xdrs;
 254         u_int pos;
 255 {
 256         ptrdiff_t delta;
 257         char *newaddr = xdrs->x_base + pos;
 258         char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
 259
 260         if (newaddr > lastaddr)
 261                 return (FALSE);
 262         xdrs->x_private = newaddr;
 263         delta = lastaddr - newaddr;
 264 #ifdef __LP64__
 265         if (delta > UINT32_MAX) return (FALSE);
 266 #endif
 267         xdrs->x_handy = delta;
 268         return (TRUE);
 269 }
 270
 271 static int32_t *
 272 xdrmem_inline_aligned(xdrs, len)
 273         XDR *xdrs;
 274         u_int len;
 275 {
 276         int32_t *buf = 0;
 277
 278         if (xdrs->x_handy >= len) {
 279                 xdrs->x_handy -= len;
 280                 buf = (int32_t *)xdrs->x_private;
 281                 xdrs->x_private = (char *)xdrs->x_private + len;
 282         }
 283         return (buf);
 284 }
 285
 286 /* ARGSUSED */
 287 static int32_t *
 288 xdrmem_inline_unaligned(xdrs, len)
 289         XDR *xdrs;
 290         u_int len;
 291 {
 292         return (0);
 293 }