lib/libc/xdr/xdr_mem.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  *
  29  * @(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro
  30  * @(#)xdr_mem.c        2.1 88/07/29 4.0 RPCSRC
  31  * $FreeBSD: src/lib/libc/xdr/xdr_mem.c,v 1.8.2.1 2003/03/20 12:59:55 jedgar Exp $
  32  * $DragonFly: src/lib/libc/xdr/xdr_mem.c,v 1.4 2005/12/05 00:47:57 swildner Exp $
  33  */
  34
  35 /*
  36  * xdr_mem.h, XDR implementation using memory buffers.
  37  *
  38  * Copyright (C) 1984, Sun Microsystems, Inc.
  39  *
  40  * If you have some data to be interpreted as external data representation
  41  * or to be converted to external data representation in a memory buffer,
  42  * then this is the package for you.
  43  *
  44  */
  45
  46 #include <string.h>
  47 #include <rpc/types.h>
  48 #include <rpc/xdr.h>
  49 #include <netinet/in.h>
  50
  51 static bool_t   xdrmem_getlong_aligned(XDR *, long *);
  52 static bool_t   xdrmem_putlong_aligned(XDR *, long *);
  53 static bool_t   xdrmem_getlong_unaligned(XDR *, long *);
  54 static bool_t   xdrmem_putlong_unaligned(XDR *, long *);
  55 static bool_t   xdrmem_getbytes(XDR *, caddr_t, u_int);
  56 static bool_t   xdrmem_putbytes(XDR *, caddr_t, u_int);
  57 static u_int    xdrmem_getpos(XDR *); /* XXX w/64-bit pointers, u_int not enough! */
  58 static bool_t   xdrmem_setpos(XDR *, u_int);
  59 static int32_t *xdrmem_inline_aligned(XDR *, int);
  60 static int32_t *xdrmem_inline_unaligned(XDR *, int);
  61 static void     xdrmem_destroy(void);
  62
  63 static struct   xdr_ops xdrmem_ops_aligned = {
  64         xdrmem_getlong_aligned,
  65         xdrmem_putlong_aligned,
  66         xdrmem_getbytes,
  67         xdrmem_putbytes,
  68         xdrmem_getpos,
  69         xdrmem_setpos,
  70         xdrmem_inline_aligned,
  71         xdrmem_destroy
  72 };
  73
  74 static struct   xdr_ops xdrmem_ops_unaligned = {
  75         xdrmem_getlong_unaligned,
  76         xdrmem_putlong_unaligned,
  77         xdrmem_getbytes,
  78         xdrmem_putbytes,
  79         xdrmem_getpos,
  80         xdrmem_setpos,
  81         xdrmem_inline_unaligned,
  82         xdrmem_destroy
  83 };
  84
  85 /*
  86  * The procedure xdrmem_create initializes a stream descriptor for a
  87  * memory buffer.
  88  */
  89 void
  90 xdrmem_create(XDR *xdrs, caddr_t addr, u_int size, enum xdr_op op)
  91 {
  92
  93         xdrs->x_op = op;
  94         xdrs->x_ops = ((size_t)addr & (sizeof(int32_t) - 1))
  95                 ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
  96         xdrs->x_private = xdrs->x_base = addr;
  97         xdrs->x_handy = size;
  98 }
  99
 100 static void
 101 xdrmem_destroy(void)
 102 {
 103 }
 104
 105 static bool_t
 106 xdrmem_getlong_aligned(XDR *xdrs, long *lp)
 107 {
 108
 109         if (xdrs->x_handy < sizeof(int32_t))
 110                 return (FALSE);
 111         xdrs->x_handy -= sizeof(int32_t);
 112         *lp = ntohl(*(int32_t *)(xdrs->x_private));
 113         xdrs->x_private += sizeof(int32_t);
 114         return (TRUE);
 115 }
 116
 117 static bool_t
 118 xdrmem_putlong_aligned(XDR *xdrs, long *lp)
 119 {
 120
 121         if (xdrs->x_handy < sizeof(int32_t))
 122                 return (FALSE);
 123         xdrs->x_handy -= sizeof(int32_t);
 124         *(int32_t *)xdrs->x_private = htonl(*lp);
 125         xdrs->x_private += sizeof(int32_t);
 126         return (TRUE);
 127 }
 128
 129 static bool_t
 130 xdrmem_getlong_unaligned(XDR *xdrs, long *lp)
 131 {
 132         int32_t l;
 133
 134         if (xdrs->x_handy < sizeof(int32_t))
 135                 return (FALSE);
 136         xdrs->x_handy -= sizeof(int32_t);
 137         memcpy(&l, xdrs->x_private, sizeof(int32_t));
 138         *lp = ntohl(l);
 139         xdrs->x_private += sizeof(int32_t);
 140         return (TRUE);
 141 }
 142
 143 static bool_t
 144 xdrmem_putlong_unaligned(XDR *xdrs, long *lp)
 145 {
 146         int32_t l;
 147
 148         if (xdrs->x_handy < sizeof(int32_t))
 149                 return (FALSE);
 150         xdrs->x_handy -= sizeof(int32_t);
 151         l = htonl(*lp);
 152         memcpy(xdrs->x_private, &l, sizeof(int32_t));
 153         xdrs->x_private += sizeof(int32_t);
 154         return (TRUE);
 155 }
 156
 157 static bool_t
 158 xdrmem_getbytes(XDR *xdrs, caddr_t addr, u_int len)
 159 {
 160
 161         if (xdrs->x_handy < len)
 162                 return (FALSE);
 163         xdrs->x_handy -= len;
 164         memcpy(addr, xdrs->x_private, len);
 165         xdrs->x_private += len;
 166         return (TRUE);
 167 }
 168
 169 static bool_t
 170 xdrmem_putbytes(XDR *xdrs, caddr_t addr, u_int len)
 171 {
 172
 173         if (xdrs->x_handy < len)
 174                 return (FALSE);
 175         xdrs->x_handy -= len;
 176         memcpy(xdrs->x_private, addr, len);
 177         xdrs->x_private += len;
 178         return (TRUE);
 179 }
 180
 181 static u_int
 182 xdrmem_getpos(XDR *xdrs)
 183 {
 184
 185         /* XXX w/64-bit pointers, u_int not enough! */
 186         return ((u_long)xdrs->x_private - (u_long)xdrs->x_base);
 187 }
 188
 189 static bool_t
 190 xdrmem_setpos(XDR *xdrs, u_int pos)
 191 {
 192         caddr_t newaddr = xdrs->x_base + pos;
 193         caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
 194
 195         if (newaddr > lastaddr)
 196                 return (FALSE);
 197         xdrs->x_private = newaddr;
 198         xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */
 199         return (TRUE);
 200 }
 201
 202 static int32_t *
 203 xdrmem_inline_aligned(XDR *xdrs, int len)
 204 {
 205         int32_t *buf = 0;
 206
 207         if (xdrs->x_handy >= len) {
 208                 xdrs->x_handy -= len;
 209                 buf = (int32_t *) xdrs->x_private;
 210                 xdrs->x_private += len;
 211         }
 212         return (buf);
 213 }
 214
 215 static int32_t *
 216 xdrmem_inline_unaligned(XDR *xdrs __unused, int len __unused)
 217 {
 218         return (0);
 219 }