rpc.subproj/xdr_mem.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  27  * unrestricted use provided that this legend is included on all tape
  28  * media and as a part of the software program in whole or part.  Users
  29  * may copy or modify Sun RPC without charge, but are not authorized
  30  * to license or distribute it to anyone else except as part of a product or
  31  * program developed by the user.
  32  *
  33  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  34  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  35  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  36  *
  37  * Sun RPC is provided with no support and without any obligation on the
  38  * part of Sun Microsystems, Inc. to assist in its use, correction,
  39  * modification or enhancement.
  40  *
  41  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  42  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  43  * OR ANY PART THEREOF.
  44  *
  45  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  46  * or profits or other special, indirect and consequential damages, even if
  47  * Sun has been advised of the possibility of such damages.
  48  *
  49  * Sun Microsystems, Inc.
  50  * 2550 Garcia Avenue
  51  * Mountain View, California  94043
  52  */
  53
  54 #if defined(LIBC_SCCS) && !defined(lint)
  55 /*static char *sccsid = "from: @(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";*/
  56 /*static char *sccsid = "from: @(#)xdr_mem.c    2.1 88/07/29 4.0 RPCSRC";*/
  57 static char *rcsid = "$Id: xdr_mem.c,v 1.5 2003/06/23 17:24:59 majka Exp $";
  58 #endif
  59
  60 /*
  61  * xdr_mem.h, XDR implementation using memory buffers.
  62  *
  63  * Copyright (C) 1984, Sun Microsystems, Inc.
  64  *
  65  * If you have some data to be interpreted as external data representation
  66  * or to be converted to external data representation in a memory buffer,
  67  * then this is the package for you.
  68  *
  69  */
  70
  71
  72 #include <string.h>
  73 #include <rpc/types.h>
  74 #include <rpc/xdr.h>
  75 #include <netinet/in.h>
  76
  77 static bool_t   xdrmem_getlong();
  78 static bool_t   xdrmem_putlong();
  79 static bool_t   xdrmem_getbytes();
  80 static bool_t   xdrmem_putbytes();
  81 static u_int    xdrmem_getpos();
  82 static bool_t   xdrmem_setpos();
  83 static long *   xdrmem_inline();
  84 static void     xdrmem_destroy();
  85
  86 static struct   xdr_ops xdrmem_ops = {
  87         xdrmem_getlong,
  88         xdrmem_putlong,
  89         xdrmem_getbytes,
  90         xdrmem_putbytes,
  91         xdrmem_getpos,
  92         xdrmem_setpos,
  93         xdrmem_inline,
  94         xdrmem_destroy
  95 };
  96
  97 /*
  98  * The procedure xdrmem_create initializes a stream descriptor for a
  99  * memory buffer.
 100  */
 101 void
 102 xdrmem_create(xdrs, addr, size, op)
 103         register XDR *xdrs;
 104 #if defined(__APPLE__)
 105         void *addr;
 106 #else
 107         caddr_t addr;
 108 #endif
 109         u_int size;
 110         enum xdr_op op;
 111 {
 112
 113         xdrs->x_op = op;
 114         xdrs->x_ops = &xdrmem_ops;
 115         xdrs->x_private = xdrs->x_base = addr;
 116         xdrs->x_handy = size;
 117 }
 118
 119 static void
 120 xdrmem_destroy(XDR *xdrs)
 121 {
 122 }
 123
 124 static bool_t
 125 xdrmem_getlong(xdrs, lp)
 126         register XDR *xdrs;
 127         long *lp;
 128 {
 129         if ((xdrs->x_handy -= sizeof(long)) < 0)
 130                 return (FALSE);
 131         *lp = (long)ntohl((u_long)(*((long *)(xdrs->x_private))));
 132         xdrs->x_private += sizeof(long);
 133         return (TRUE);
 134 }
 135
 136 static bool_t
 137 xdrmem_putlong(xdrs, lp)
 138         register XDR *xdrs;
 139         long *lp;
 140 {
 141         if ((xdrs->x_handy -= sizeof(long)) < 0)
 142                 return (FALSE);
 143         *(long *)xdrs->x_private = (long)htonl((u_long)(*lp));
 144         xdrs->x_private += sizeof(long);
 145         return (TRUE);
 146 }
 147
 148 static bool_t
 149 xdrmem_getbytes(xdrs, addr, len)
 150         register XDR *xdrs;
 151         caddr_t addr;
 152         register u_int len;
 153 {
 154
 155         if ((xdrs->x_handy -= len) < 0)
 156                 return (FALSE);
 157         bcopy(xdrs->x_private, addr, len);
 158         xdrs->x_private += len;
 159         return (TRUE);
 160 }
 161
 162 static bool_t
 163 xdrmem_putbytes(xdrs, addr, len)
 164         register XDR *xdrs;
 165         caddr_t addr;
 166         register u_int len;
 167 {
 168
 169         if ((xdrs->x_handy -= len) < 0)
 170                 return (FALSE);
 171         bcopy(addr, xdrs->x_private, len);
 172         xdrs->x_private += len;
 173         return (TRUE);
 174 }
 175
 176 static u_int
 177 xdrmem_getpos(xdrs)
 178         register XDR *xdrs;
 179 {
 180         return ((u_int)xdrs->x_private - (u_int)xdrs->x_base);
 181 }
 182
 183 static bool_t
 184 xdrmem_setpos(xdrs, pos)
 185         register XDR *xdrs;
 186         u_int pos;
 187 {
 188         register caddr_t newaddr = xdrs->x_base + pos;
 189         register caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
 190
 191         if ((long)newaddr > (long)lastaddr)
 192                 return (FALSE);
 193         xdrs->x_private = newaddr;
 194         xdrs->x_handy = (int)lastaddr - (int)newaddr;
 195         return (TRUE);
 196 }
 197
 198 static long *
 199 xdrmem_inline(xdrs, len)
 200         register XDR *xdrs;
 201         int len;
 202 {
 203         long *buf = 0;
 204
 205         if (xdrs->x_handy >= len) {
 206                 xdrs->x_handy -= len;
 207                 buf = (long *) xdrs->x_private;
 208                 xdrs->x_private += len;
 209         }
 210         return (buf);
 211 }