lib/libc/rpc/xdr_mem.c

   1 /*      $NetBSD: xdr_mem.c,v 1.17 2006/10/15 16:14:46 christos Exp $    */
   2
   3 /*
   4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   5  * unrestricted use provided that this legend is included on all tape
   6  * media and as a part of the software program in whole or part.  Users
   7  * may copy or modify Sun RPC without charge, but are not authorized
   8  * to license or distribute it to anyone else except as part of a product or
   9  * program developed by the user.
  10  *
  11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  14  *
  15  * Sun RPC is provided with no support and without any obligation on the
  16  * part of Sun Microsystems, Inc. to assist in its use, correction,
  17  * modification or enhancement.
  18  *
  19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  21  * OR ANY PART THEREOF.
  22  *
  23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  24  * or profits or other special, indirect and consequential damages, even if
  25  * Sun has been advised of the possibility of such damages.
  26  *
  27  * Sun Microsystems, Inc.
  28  * 2550 Garcia Avenue
  29  * Mountain View, California  94043
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char *sccsid = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
  36 static char *sccsid = "@(#)xdr_mem.c    2.1 88/07/29 4.0 RPCSRC";
  37 #else
  38 __RCSID("$NetBSD: xdr_mem.c,v 1.17 2006/10/15 16:14:46 christos Exp $");
  39 #endif
  40 #endif
  41
  42 /*
  43  * xdr_mem.h, XDR implementation using memory buffers.
  44  *
  45  * Copyright (C) 1984, Sun Microsystems, Inc.
  46  *
  47  * If you have some data to be interpreted as external data representation
  48  * or to be converted to external data representation in a memory buffer,
  49  * then this is the package for you.
  50  *
  51  */
  52
  53 #include "namespace.h"
  54
  55 #include <sys/types.h>
  56
  57 #include <netinet/in.h>
  58
  59 #include <string.h>
  60
  61 #include <rpc/types.h>
  62 #include <rpc/xdr.h>
  63
  64 #ifdef __weak_alias
  65 __weak_alias(xdrmem_create,_xdrmem_create)
  66 #endif
  67
  68 static void xdrmem_destroy __P((XDR *));
  69 static bool_t xdrmem_getlong_aligned __P((XDR *, long *));
  70 static bool_t xdrmem_putlong_aligned __P((XDR *, const long *));
  71 static bool_t xdrmem_getlong_unaligned __P((XDR *, long *));
  72 static bool_t xdrmem_putlong_unaligned __P((XDR *, const long *));
  73 static bool_t xdrmem_getbytes __P((XDR *, char *, u_int));
  74 static bool_t xdrmem_putbytes __P((XDR *, const char *, u_int));
  75 /* XXX: w/64-bit pointers, u_int not enough! */
  76 static u_int xdrmem_getpos __P((XDR *));
  77 static bool_t xdrmem_setpos __P((XDR *, u_int));
  78 static int32_t *xdrmem_inline_aligned __P((XDR *, u_int));
  79 static int32_t *xdrmem_inline_unaligned __P((XDR *, u_int));
  80
  81 static const struct     xdr_ops xdrmem_ops_aligned = {
  82         xdrmem_getlong_aligned,
  83         xdrmem_putlong_aligned,
  84         xdrmem_getbytes,
  85         xdrmem_putbytes,
  86         xdrmem_getpos,
  87         xdrmem_setpos,
  88         xdrmem_inline_aligned,
  89         xdrmem_destroy,
  90         NULL,   /* xdrmem_control */
  91 };
  92
  93 static const struct     xdr_ops xdrmem_ops_unaligned = {
  94         xdrmem_getlong_unaligned,
  95         xdrmem_putlong_unaligned,
  96         xdrmem_getbytes,
  97         xdrmem_putbytes,
  98         xdrmem_getpos,
  99         xdrmem_setpos,
 100         xdrmem_inline_unaligned,
 101         xdrmem_destroy,
 102         NULL,   /* xdrmem_control */
 103 };
 104
 105 /*
 106  * The procedure xdrmem_create initializes a stream descriptor for a
 107  * memory buffer.
 108  */
 109 void
 110 xdrmem_create(xdrs, addr, size, op)
 111         XDR *xdrs;
 112         char *addr;
 113         u_int size;
 114         enum xdr_op op;
 115 {
 116
 117         xdrs->x_op = op;
 118         xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
 119             ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
 120         xdrs->x_private = xdrs->x_base = addr;
 121         xdrs->x_handy = size;
 122 }
 123
 124 /*ARGSUSED*/
 125 static void
 126 xdrmem_destroy(xdrs)
 127         XDR *xdrs;
 128 {
 129
 130 }
 131
 132 static bool_t
 133 xdrmem_getlong_aligned(xdrs, lp)
 134         XDR *xdrs;
 135         long *lp;
 136 {
 137
 138         if (xdrs->x_handy < sizeof(int32_t))
 139                 return (FALSE);
 140         xdrs->x_handy -= sizeof(int32_t);
 141         *lp = ntohl(*(u_int32_t *)xdrs->x_private);
 142         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 143         return (TRUE);
 144 }
 145
 146 static bool_t
 147 xdrmem_putlong_aligned(xdrs, lp)
 148         XDR *xdrs;
 149         const long *lp;
 150 {
 151
 152         if (xdrs->x_handy < sizeof(int32_t))
 153                 return (FALSE);
 154         xdrs->x_handy -= sizeof(int32_t);
 155         *(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp);
 156         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 157         return (TRUE);
 158 }
 159
 160 static bool_t
 161 xdrmem_getlong_unaligned(xdrs, lp)
 162         XDR *xdrs;
 163         long *lp;
 164 {
 165         u_int32_t l;
 166
 167         if (xdrs->x_handy < sizeof(int32_t))
 168                 return (FALSE);
 169         xdrs->x_handy -= sizeof(int32_t);
 170         memmove(&l, xdrs->x_private, sizeof(int32_t));
 171         *lp = ntohl(l);
 172         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 173         return (TRUE);
 174 }
 175
 176 static bool_t
 177 xdrmem_putlong_unaligned(xdrs, lp)
 178         XDR *xdrs;
 179         const long *lp;
 180 {
 181         u_int32_t l;
 182
 183         if (xdrs->x_handy < sizeof(int32_t))
 184                 return (FALSE);
 185         xdrs->x_handy -= sizeof(int32_t);
 186         l = htonl((u_int32_t)*lp);
 187         memmove(xdrs->x_private, &l, sizeof(int32_t));
 188         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 189         return (TRUE);
 190 }
 191
 192 static bool_t
 193 xdrmem_getbytes(xdrs, addr, len)
 194         XDR *xdrs;
 195         char *addr;
 196         u_int len;
 197 {
 198
 199         if (xdrs->x_handy < len)
 200                 return (FALSE);
 201         xdrs->x_handy -= len;
 202         memmove(addr, xdrs->x_private, len);
 203         xdrs->x_private = (char *)xdrs->x_private + len;
 204         return (TRUE);
 205 }
 206
 207 static bool_t
 208 xdrmem_putbytes(xdrs, addr, len)
 209         XDR *xdrs;
 210         const char *addr;
 211         u_int len;
 212 {
 213
 214         if (xdrs->x_handy < len)
 215                 return (FALSE);
 216         xdrs->x_handy -= len;
 217         memmove(xdrs->x_private, addr, len);
 218         xdrs->x_private = (char *)xdrs->x_private + len;
 219         return (TRUE);
 220 }
 221
 222 static u_int
 223 xdrmem_getpos(xdrs)
 224         XDR *xdrs;
 225 {
 226
 227         /* XXX w/64-bit pointers, u_int not enough! */
 228         return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base);
 229 }
 230
 231 static bool_t
 232 xdrmem_setpos(xdrs, pos)
 233         XDR *xdrs;
 234         u_int pos;
 235 {
 236         char *newaddr = xdrs->x_base + pos;
 237         char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
 238
 239         if ((long)newaddr > (long)lastaddr)
 240                 return (FALSE);
 241         xdrs->x_private = newaddr;
 242         xdrs->x_handy = (int)((long)lastaddr - (long)newaddr);
 243         return (TRUE);
 244 }
 245
 246 static int32_t *
 247 xdrmem_inline_aligned(xdrs, len)
 248         XDR *xdrs;
 249         u_int len;
 250 {
 251         int32_t *buf = 0;
 252
 253         if (xdrs->x_handy >= len) {
 254                 xdrs->x_handy -= len;
 255                 buf = (int32_t *)xdrs->x_private;
 256                 xdrs->x_private = (char *)xdrs->x_private + len;
 257         }
 258         return (buf);
 259 }
 260
 261 /* ARGSUSED */
 262 static int32_t *
 263 xdrmem_inline_unaligned(xdrs, len)
 264         XDR *xdrs;
 265         u_int len;
 266 {
 267
 268         return (0);
 269 }