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 1.5 2003/06/23 17:24:59 majka 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
 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(XDR *xdrs)
 120 {
 121 }
 122
 123 static bool_t
 124 xdrmem_getlong(xdrs, lp)
 125         register XDR *xdrs;
 126         long *lp;
 127 {
 128         if ((xdrs->x_handy -= sizeof(long)) < 0)
 129                 return (FALSE);
 130         *lp = (long)ntohl((u_long)(*((long *)(xdrs->x_private))));
 131         xdrs->x_private += sizeof(long);
 132         return (TRUE);
 133 }
 134
 135 static bool_t
 136 xdrmem_putlong(xdrs, lp)
 137         register XDR *xdrs;
 138         long *lp;
 139 {
 140         if ((xdrs->x_handy -= sizeof(long)) < 0)
 141                 return (FALSE);
 142         *(long *)xdrs->x_private = (long)htonl((u_long)(*lp));
 143         xdrs->x_private += sizeof(long);
 144         return (TRUE);
 145 }
 146
 147 static bool_t
 148 xdrmem_getbytes(xdrs, addr, len)
 149         register XDR *xdrs;
 150         caddr_t addr;
 151         register u_int len;
 152 {
 153
 154         if ((xdrs->x_handy -= len) < 0)
 155                 return (FALSE);
 156         bcopy(xdrs->x_private, addr, len);
 157         xdrs->x_private += len;
 158         return (TRUE);
 159 }
 160
 161 static bool_t
 162 xdrmem_putbytes(xdrs, addr, len)
 163         register XDR *xdrs;
 164         caddr_t addr;
 165         register u_int len;
 166 {
 167
 168         if ((xdrs->x_handy -= len) < 0)
 169                 return (FALSE);
 170         bcopy(addr, xdrs->x_private, len);
 171         xdrs->x_private += len;
 172         return (TRUE);
 173 }
 174
 175 static u_int
 176 xdrmem_getpos(xdrs)
 177         register XDR *xdrs;
 178 {
 179         return ((u_int)xdrs->x_private - (u_int)xdrs->x_base);
 180 }
 181
 182 static bool_t
 183 xdrmem_setpos(xdrs, pos)
 184         register XDR *xdrs;
 185         u_int pos;
 186 {
 187         register caddr_t newaddr = xdrs->x_base + pos;
 188         register caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
 189
 190         if ((long)newaddr > (long)lastaddr)
 191                 return (FALSE);
 192         xdrs->x_private = newaddr;
 193         xdrs->x_handy = (int)lastaddr - (int)newaddr;
 194         return (TRUE);
 195 }
 196
 197 static long *
 198 xdrmem_inline(xdrs, len)
 199         register XDR *xdrs;
 200         int len;
 201 {
 202         long *buf = 0;
 203
 204         if (xdrs->x_handy >= len) {
 205                 xdrs->x_handy -= len;
 206                 buf = (long *) xdrs->x_private;
 207                 xdrs->x_private += len;
 208         }
 209         return (buf);
 210 }