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
  75 #include <netinet/in.h>
  76
  77 #include <string.h>
  78
  79 #include <rpc/types.h>
  80 #include <rpc/xdr.h>
  81
  82 static void xdrmem_destroy(XDR *);
  83 static bool_t xdrmem_getlong_aligned(XDR *, long *);
  84 static bool_t xdrmem_putlong_aligned(XDR *, const long *);
  85 static bool_t xdrmem_getlong_unaligned(XDR *, long *);
  86 static bool_t xdrmem_putlong_unaligned(XDR *, const long *);
  87 static bool_t xdrmem_getbytes(XDR *, char *, u_int);
  88 static bool_t xdrmem_putbytes(XDR *, const char *, u_int);
  89 /* XXX: w/64-bit pointers, u_int not enough! */
  90 static u_int xdrmem_getpos(XDR *);
  91 static bool_t xdrmem_setpos(XDR *, u_int);
  92 static int32_t *xdrmem_inline_aligned(XDR *, u_int);
  93 static int32_t *xdrmem_inline_unaligned(XDR *, u_int);
  94
  95 static const struct     xdr_ops xdrmem_ops_aligned = {
  96         xdrmem_getlong_aligned,
  97         xdrmem_putlong_aligned,
  98         xdrmem_getbytes,
  99         xdrmem_putbytes,
 100         xdrmem_getpos,
 101         xdrmem_setpos,
 102         xdrmem_inline_aligned,
 103         xdrmem_destroy
 104 };
 105
 106 static const struct     xdr_ops xdrmem_ops_unaligned = {
 107         xdrmem_getlong_unaligned,
 108         xdrmem_putlong_unaligned,
 109         xdrmem_getbytes,
 110         xdrmem_putbytes,
 111         xdrmem_getpos,
 112         xdrmem_setpos,
 113         xdrmem_inline_unaligned,
 114         xdrmem_destroy
 115 };
 116
 117 /*
 118  * The procedure xdrmem_create initializes a stream descriptor for a
 119  * memory buffer.
 120  */
 121 void
 122 xdrmem_create(xdrs, addr, size, op)
 123         XDR *xdrs;
 124         char *addr;
 125         u_int size;
 126         enum xdr_op op;
 127 {
 128
 129         xdrs->x_op = op;
 130         xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
 131             ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
 132         xdrs->x_private = xdrs->x_base = addr;
 133         xdrs->x_handy = size;
 134 }
 135
 136 /*ARGSUSED*/
 137 static void
 138 xdrmem_destroy(xdrs)
 139         XDR *xdrs;
 140 {
 141
 142 }
 143
 144 static bool_t
 145 xdrmem_getlong_aligned(xdrs, lp)
 146         XDR *xdrs;
 147         long *lp;
 148 {
 149
 150         if (xdrs->x_handy < sizeof(int32_t))
 151                 return (FALSE);
 152         xdrs->x_handy -= sizeof(int32_t);
 153         *lp = ntohl(*(u_int32_t *)xdrs->x_private);
 154         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 155         return (TRUE);
 156 }
 157
 158 static bool_t
 159 xdrmem_putlong_aligned(xdrs, lp)
 160         XDR *xdrs;
 161         const long *lp;
 162 {
 163
 164         if (xdrs->x_handy < sizeof(int32_t))
 165                 return (FALSE);
 166         xdrs->x_handy -= sizeof(int32_t);
 167         *(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp);
 168         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 169         return (TRUE);
 170 }
 171
 172 static bool_t
 173 xdrmem_getlong_unaligned(xdrs, lp)
 174         XDR *xdrs;
 175         long *lp;
 176 {
 177         u_int32_t l;
 178
 179         if (xdrs->x_handy < sizeof(int32_t))
 180                 return (FALSE);
 181         xdrs->x_handy -= sizeof(int32_t);
 182         memmove(&l, xdrs->x_private, sizeof(int32_t));
 183         *lp = ntohl(l);
 184         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 185         return (TRUE);
 186 }
 187
 188 static bool_t
 189 xdrmem_putlong_unaligned(xdrs, lp)
 190         XDR *xdrs;
 191         const long *lp;
 192 {
 193         u_int32_t l;
 194
 195         if (xdrs->x_handy < sizeof(int32_t))
 196                 return (FALSE);
 197         xdrs->x_handy -= sizeof(int32_t);
 198         l = htonl((u_int32_t)*lp);
 199         memmove(xdrs->x_private, &l, sizeof(int32_t));
 200         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 201         return (TRUE);
 202 }
 203
 204 static bool_t
 205 xdrmem_getbytes(xdrs, addr, len)
 206         XDR *xdrs;
 207         char *addr;
 208         u_int len;
 209 {
 210
 211         if (xdrs->x_handy < len)
 212                 return (FALSE);
 213         xdrs->x_handy -= len;
 214         memmove(addr, xdrs->x_private, len);
 215         xdrs->x_private = (char *)xdrs->x_private + len;
 216         return (TRUE);
 217 }
 218
 219 static bool_t
 220 xdrmem_putbytes(xdrs, addr, len)
 221         XDR *xdrs;
 222         const char *addr;
 223         u_int len;
 224 {
 225
 226         if (xdrs->x_handy < len)
 227                 return (FALSE);
 228         xdrs->x_handy -= len;
 229         memmove(xdrs->x_private, addr, len);
 230         xdrs->x_private = (char *)xdrs->x_private + len;
 231         return (TRUE);
 232 }
 233
 234 static u_int
 235 xdrmem_getpos(xdrs)
 236         XDR *xdrs;
 237 {
 238
 239         /* XXX w/64-bit pointers, u_int not enough! */
 240         return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base);
 241 }
 242
 243 static bool_t
 244 xdrmem_setpos(xdrs, pos)
 245         XDR *xdrs;
 246         u_int pos;
 247 {
 248         char *newaddr = xdrs->x_base + pos;
 249         char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
 250
 251         if (newaddr > lastaddr)
 252                 return (FALSE);
 253         xdrs->x_private = newaddr;
 254         xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */
 255         return (TRUE);
 256 }
 257
 258 static int32_t *
 259 xdrmem_inline_aligned(xdrs, len)
 260         XDR *xdrs;
 261         u_int len;
 262 {
 263         int32_t *buf = 0;
 264
 265         if (xdrs->x_handy >= len) {
 266                 xdrs->x_handy -= len;
 267                 buf = (int32_t *)xdrs->x_private;
 268                 xdrs->x_private = (char *)xdrs->x_private + len;
 269         }
 270         return (buf);
 271 }
 272
 273 /* ARGSUSED */
 274 static int32_t *
 275 xdrmem_inline_unaligned(xdrs, len)
 276         XDR *xdrs;
 277         u_int len;
 278 {
 279
 280         return (0);
 281 }