src/rx/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 #include <afsconfig.h>
  30 #include <afs/param.h>
  31
  32 /*
  33  * xdr_mem.h, XDR implementation using memory buffers.
  34  *
  35  * Copyright (C) 1984, Sun Microsystems, Inc.
  36  *
  37  * If you have some data to be interpreted as external data representation
  38  * or to be converted to external data representation in a memory buffer,
  39  * then this is the package for you.
  40  *
  41  */
  42
  43 #ifdef KERNEL
  44 # include "afs/sysincludes.h"
  45 #else
  46 # include <roken.h>
  47 # include <limits.h>
  48 #endif
  49
  50 #include "xdr.h"
  51
  52 static bool_t xdrmem_getint32(XDR *, afs_int32 *);
  53 static bool_t xdrmem_putint32(XDR *, afs_int32 *);
  54 static bool_t xdrmem_getbytes(XDR *, caddr_t, u_int);
  55 static bool_t xdrmem_putbytes(XDR *, caddr_t, u_int);
  56 static u_int xdrmem_getpos(XDR *);
  57 static bool_t xdrmem_setpos(XDR *, u_int);
  58 static afs_int32 *xdrmem_inline(XDR *, u_int);
  59 static void xdrmem_destroy(XDR *);
  60
  61 static struct xdr_ops xdrmem_ops = {
  62 #ifndef HAVE_STRUCT_LABEL_SUPPORT
  63     /* Windows does not support labeled assigments */
  64     xdrmem_getint32,    /* deserialize an afs_int32 */
  65     xdrmem_putint32,    /* serialize an afs_int32 */
  66     xdrmem_getbytes,    /* deserialize counted bytes */
  67     xdrmem_putbytes,    /* serialize counted bytes */
  68     xdrmem_getpos,      /* get offset in the stream: not supported. */
  69     xdrmem_setpos,      /* set offset in the stream: not supported. */
  70     xdrmem_inline,      /* prime stream for inline macros */
  71     xdrmem_destroy,     /* destroy stream */
  72 #else
  73     .x_getint32 = xdrmem_getint32,
  74     .x_putint32 = xdrmem_putint32,
  75     .x_getbytes = xdrmem_getbytes,
  76     .x_putbytes = xdrmem_putbytes,
  77     .x_getpostn = xdrmem_getpos,
  78     .x_setpostn = xdrmem_setpos,
  79     .x_inline = xdrmem_inline,
  80     .x_destroy = xdrmem_destroy
  81 #endif
  82 };
  83
  84 /*
  85  * The procedure xdrmem_create initializes a stream descriptor for a
  86  * memory buffer.
  87  */
  88 void
  89 xdrmem_create(XDR * xdrs, caddr_t addr, u_int size, enum xdr_op op)
  90 {
  91     xdrs->x_op = op;
  92     xdrs->x_ops = &xdrmem_ops;
  93     xdrs->x_private = xdrs->x_base = addr;
  94     xdrs->x_handy = (size > INT_MAX) ? INT_MAX : size;  /* XXX */
  95 }
  96
  97 static void
  98 xdrmem_destroy(XDR *xdrs)
  99 {
 100 }
 101
 102 static bool_t
 103 xdrmem_getint32(XDR *xdrs, afs_int32 * lp)
 104 {
 105     if (xdrs->x_handy < sizeof(afs_int32))
 106         return (FALSE);
 107     else
 108         xdrs->x_handy -= sizeof(afs_int32);
 109     *lp = ntohl(*((afs_int32 *) (xdrs->x_private)));
 110     xdrs->x_private += sizeof(afs_int32);
 111     return (TRUE);
 112 }
 113
 114 static bool_t
 115 xdrmem_putint32(XDR *xdrs, afs_int32 * lp)
 116 {
 117     if (xdrs->x_handy < sizeof(afs_int32))
 118         return (FALSE);
 119     else
 120         xdrs->x_handy -= sizeof(afs_int32);
 121     *(afs_int32 *) xdrs->x_private = htonl(*lp);
 122     xdrs->x_private += sizeof(afs_int32);
 123     return (TRUE);
 124 }
 125
 126 static bool_t
 127 xdrmem_getbytes(XDR *xdrs, caddr_t addr, u_int len)
 128 {
 129     if (xdrs->x_handy < len)
 130         return (FALSE);
 131     else
 132         xdrs->x_handy -= len;
 133     memcpy(addr, xdrs->x_private, len);
 134     xdrs->x_private += len;
 135     return (TRUE);
 136 }
 137
 138 static bool_t
 139 xdrmem_putbytes(XDR *xdrs, caddr_t addr, u_int len)
 140 {
 141     if (xdrs->x_handy < len)
 142         return (FALSE);
 143     else
 144         xdrs->x_handy -= len;
 145     memcpy(xdrs->x_private, addr, len);
 146     xdrs->x_private += len;
 147     return (TRUE);
 148 }
 149
 150 static u_int
 151 xdrmem_getpos(XDR *xdrs)
 152 {
 153     return ((u_int)(xdrs->x_private - xdrs->x_base));
 154 }
 155
 156 static bool_t
 157 xdrmem_setpos(XDR *xdrs, u_int pos)
 158 {
 159     caddr_t newaddr = xdrs->x_base + pos;
 160     caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
 161
 162     if (newaddr > lastaddr)
 163         return (FALSE);
 164     xdrs->x_private = newaddr;
 165     xdrs->x_handy = (int)(lastaddr - newaddr);
 166     return (TRUE);
 167 }
 168
 169 static afs_int32 *
 170 xdrmem_inline(XDR *xdrs, u_int len)
 171 {
 172     afs_int32 *buf = 0;
 173
 174     if (xdrs->x_handy >= len) {
 175         xdrs->x_handy -= len;
 176         buf = (afs_int32 *) xdrs->x_private;
 177         xdrs->x_private += len;
 178     }
 179     return (buf);
 180 }