sunrpc/xdr_mem.c

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