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  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  26  * unrestricted use provided that this legend is included on all tape
  27  * media and as a part of the software program in whole or part.  Users
  28  * may copy or modify Sun RPC without charge, but are not authorized
  29  * to license or distribute it to anyone else except as part of a product or
  30  * program developed by the user.
  31  *
  32  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  33  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  34  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  35  *
  36  * Sun RPC is provided with no support and without any obligation on the
  37  * part of Sun Microsystems, Inc. to assist in its use, correction,
  38  * modification or enhancement.
  39  *
  40  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  41  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  42  * OR ANY PART THEREOF.
  43  *
  44  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  45  * or profits or other special, indirect and consequential damages, even if
  46  * Sun has been advised of the possibility of such damages.
  47  *
  48  * Sun Microsystems, Inc.
  49  * 2550 Garcia Avenue
  50  * Mountain View, California  94043
  51  */
  52
  53 #if defined(LIBC_SCCS) && !defined(lint)
  54 /*static char *sccsid = "from: @(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";*/
  55 /*static char *sccsid = "from: @(#)xdr_mem.c    2.1 88/07/29 4.0 RPCSRC";*/
  56 static char *rcsid = "$Id: xdr_mem.c,v 1.3 2002/02/19 20:36:26 epeyton Exp $";
  57 #endif
  58
  59 /*
  60  * xdr_mem.h, XDR implementation using memory buffers.
  61  *
  62  * Copyright (C) 1984, Sun Microsystems, Inc.
  63  *
  64  * If you have some data to be interpreted as external data representation
  65  * or to be converted to external data representation in a memory buffer,
  66  * then this is the package for you.
  67  *
  68  */
  69
  70
  71 #include <string.h>
  72 #include <rpc/types.h>
  73 #include <rpc/xdr.h>
  74 #include <netinet/in.h>
  75
  76 static bool_t   xdrmem_getlong();
  77 static bool_t   xdrmem_putlong();
  78 static bool_t   xdrmem_getbytes();
  79 static bool_t   xdrmem_putbytes();
  80 static u_int    xdrmem_getpos();
  81 static bool_t   xdrmem_setpos();
  82 static long *   xdrmem_inline();
  83 static void     xdrmem_destroy();
  84
  85 static struct   xdr_ops xdrmem_ops = {
  86         xdrmem_getlong,
  87         xdrmem_putlong,
  88         xdrmem_getbytes,
  89         xdrmem_putbytes,
  90         xdrmem_getpos,
  91         xdrmem_setpos,
  92         xdrmem_inline,
  93         xdrmem_destroy
  94 };
  95
  96 /*
  97  * The procedure xdrmem_create initializes a stream descriptor for a
  98  * memory buffer.
  99  */
 100 void
 101 xdrmem_create(xdrs, addr, size, op)
 102         register XDR *xdrs;
 103 #if defined(__APPLE__)
 104         void *addr;
 105 #else
 106         caddr_t addr;
 107 #endif /* !NeXT */
 108         u_int size;
 109         enum xdr_op op;
 110 {
 111
 112         xdrs->x_op = op;
 113         xdrs->x_ops = &xdrmem_ops;
 114         xdrs->x_private = xdrs->x_base = addr;
 115         xdrs->x_handy = size;
 116 }
 117
 118 static void
 119 xdrmem_destroy(/*xdrs*/)
 120         /*XDR *xdrs;*/
 121 {
 122 }
 123
 124 static bool_t
 125 xdrmem_getlong(xdrs, lp)
 126         register XDR *xdrs;
 127         long *lp;
 128 {
 129
 130         if ((xdrs->x_handy -= sizeof(long)) < 0)
 131                 return (FALSE);
 132         *lp = (long)ntohl((u_long)(*((long *)(xdrs->x_private))));
 133         xdrs->x_private += sizeof(long);
 134         return (TRUE);
 135 }
 136
 137 static bool_t
 138 xdrmem_putlong(xdrs, lp)
 139         register XDR *xdrs;
 140         long *lp;
 141 {
 142
 143         if ((xdrs->x_handy -= sizeof(long)) < 0)
 144                 return (FALSE);
 145         *(long *)xdrs->x_private = (long)htonl((u_long)(*lp));
 146         xdrs->x_private += sizeof(long);
 147         return (TRUE);
 148 }
 149
 150 static bool_t
 151 xdrmem_getbytes(xdrs, addr, len)
 152         register XDR *xdrs;
 153         caddr_t addr;
 154         register u_int len;
 155 {
 156
 157         if ((xdrs->x_handy -= len) < 0)
 158                 return (FALSE);
 159         bcopy(xdrs->x_private, addr, len);
 160         xdrs->x_private += len;
 161         return (TRUE);
 162 }
 163
 164 static bool_t
 165 xdrmem_putbytes(xdrs, addr, len)
 166         register XDR *xdrs;
 167         caddr_t addr;
 168         register u_int len;
 169 {
 170
 171         if ((xdrs->x_handy -= len) < 0)
 172                 return (FALSE);
 173         bcopy(addr, xdrs->x_private, len);
 174         xdrs->x_private += len;
 175         return (TRUE);
 176 }
 177
 178 static u_int
 179 xdrmem_getpos(xdrs)
 180         register XDR *xdrs;
 181 {
 182
 183         return ((u_int)xdrs->x_private - (u_int)xdrs->x_base);
 184 }
 185
 186 static bool_t
 187 xdrmem_setpos(xdrs, pos)
 188         register XDR *xdrs;
 189         u_int pos;
 190 {
 191         register caddr_t newaddr = xdrs->x_base + pos;
 192         register caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
 193
 194         if ((long)newaddr > (long)lastaddr)
 195                 return (FALSE);
 196         xdrs->x_private = newaddr;
 197         xdrs->x_handy = (int)lastaddr - (int)newaddr;
 198         return (TRUE);
 199 }
 200
 201 static long *
 202 xdrmem_inline(xdrs, len)
 203         register XDR *xdrs;
 204         int len;
 205 {
 206         long *buf = 0;
 207
 208         if (xdrs->x_handy >= len) {
 209                 xdrs->x_handy -= len;
 210                 buf = (long *) xdrs->x_private;
 211                 xdrs->x_private += len;
 212         }
 213         return (buf);
 214 }