src/rx/xdr_len.c

   1 /*
   2  * Copyright (c) 2010 Your Filesystem Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
  14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  19  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  20  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  23  */
  24
  25 #include <afsconfig.h>
  26 #include <afs/param.h>
  27
  28 #ifdef KERNEL
  29 # include "afs/sysincludes.h"
  30 #else
  31 # include <roken.h>
  32 #endif
  33
  34 #include "xdr.h"
  35
  36 static void
  37 xdrlen_destroy(XDR *xdrs)
  38 {
  39 }
  40
  41 static bool_t
  42 xdrlen_getint32(XDR *xdrs, afs_int32 * lp)
  43 {
  44     return (FALSE);
  45 }
  46
  47 static bool_t
  48 xdrlen_putint32(XDR *xdrs, afs_int32 * lp)
  49 {
  50     xdrs->x_handy += sizeof(afs_int32);
  51     return (TRUE);
  52 }
  53
  54 static bool_t
  55 xdrlen_getbytes(XDR *xdrs, caddr_t addr, u_int len)
  56 {
  57     return (FALSE);
  58 }
  59
  60 static bool_t
  61 xdrlen_putbytes(XDR *xdrs, caddr_t addr, u_int len)
  62 {
  63     xdrs->x_handy += len;
  64     return (TRUE);
  65 }
  66
  67 static u_int
  68 xdrlen_getpos(XDR *xdrs)
  69 {
  70     return xdrs->x_handy;
  71 }
  72
  73 static bool_t
  74 xdrlen_setpos(XDR *xdrs, u_int pos)
  75 {
  76     xdrs->x_handy = pos;
  77     return (TRUE);
  78 }
  79
  80 static afs_int32 *
  81 xdrlen_inline(XDR *xdrs, u_int len)
  82 {
  83     return NULL;
  84 }
  85
  86 static struct xdr_ops xdrlen_ops = {
  87 #ifndef HAVE_STRUCT_LABEL_SUPPORT
  88     /* Windows does not support labeled assigments */
  89     xdrlen_getint32,    /* not supported */
  90     xdrlen_putint32,    /* serialize an afs_int32 */
  91     xdrlen_getbytes,    /* not supported */
  92     xdrlen_putbytes,    /* serialize counted bytes */
  93     xdrlen_getpos,      /* get offset in the stream */
  94     xdrlen_setpos,      /* set offset in the stream */
  95     xdrlen_inline,      /* not supported */
  96     xdrlen_destroy,     /* destroy stream */
  97 #else
  98     .x_getint32 = xdrlen_getint32,
  99     .x_putint32 = xdrlen_putint32,
 100     .x_getbytes = xdrlen_getbytes,
 101     .x_putbytes = xdrlen_putbytes,
 102     .x_getpostn = xdrlen_getpos,
 103     .x_setpostn = xdrlen_setpos,
 104     .x_inline = xdrlen_inline,
 105     .x_destroy = xdrlen_destroy
 106 #endif
 107 };
 108
 109 /**
 110  * Initialise an XDR stream to calculate the space required to encode
 111  *
 112  * This initialises an XDR stream object which can be used to calculate
 113  * the space required to encode a particular structure into memory. No
 114  * encoding is actually performed, a later call using xdrmem is necessary
 115  * to do so.
 116  *
 117  * @param xdrs
 118  *      A pointer to a preallocated XDR sized block of memory.
 119  */
 120 void
 121 xdrlen_create(XDR * xdrs)
 122 {
 123     xdrs->x_op = XDR_ENCODE;
 124     xdrs->x_ops = &xdrlen_ops;
 125     xdrs->x_handy = 0;
 126 }