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/*
* xdr_sizeof.c
*
* Copyright (c) 2010, Oracle America, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
* * Neither the name of the "Oracle America, Inc." nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* General purpose routine to see how much space something will use
* when serialized using XDR.
*/
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <sys/types.h>
#include <stdlib.h>
/* ARGSUSED */
static bool_t
x_putlong (XDR *xdrs, const long *longp)
{
xdrs->x_handy += BYTES_PER_XDR_UNIT;
return TRUE;
}
/* ARGSUSED */
static bool_t
x_putbytes (XDR *xdrs, const char *bp, u_int len)
{
xdrs->x_handy += len;
return TRUE;
}
static u_int
x_getpostn (const XDR *xdrs)
{
return xdrs->x_handy;
}
/* ARGSUSED */
static bool_t
x_setpostn (XDR *xdrs, u_int len)
{
/* This is not allowed */
return FALSE;
}
static int32_t *
x_inline (XDR *xdrs, u_int len)
{
if (len == 0)
return NULL;
if (xdrs->x_op != XDR_ENCODE)
return NULL;
if (len < (u_int) (long int) xdrs->x_base)
{
/* x_private was already allocated */
xdrs->x_handy += len;
return (int32_t *) xdrs->x_private;
}
else
{
/* Free the earlier space and allocate new area */
free (xdrs->x_private);
if ((xdrs->x_private = (caddr_t) malloc (len)) == NULL)
{
xdrs->x_base = 0;
return NULL;
}
xdrs->x_base = (void *) (long) len;
xdrs->x_handy += len;
return (int32_t *) xdrs->x_private;
}
}
static int
harmless (void)
{
/* Always return FALSE/NULL, as the case may be */
return 0;
}
static void
x_destroy (XDR *xdrs)
{
xdrs->x_handy = 0;
xdrs->x_base = 0;
if (xdrs->x_private)
{
free (xdrs->x_private);
xdrs->x_private = NULL;
}
return;
}
static bool_t
x_putint32 (XDR *xdrs, const int32_t *int32p)
{
xdrs->x_handy += BYTES_PER_XDR_UNIT;
return TRUE;
}
unsigned long
xdr_sizeof (xdrproc_t func, void *data)
{
XDR x;
struct xdr_ops ops;
bool_t stat;
/* to stop ANSI-C compiler from complaining */
typedef bool_t (*dummyfunc1) (XDR *, long *);
typedef bool_t (*dummyfunc2) (XDR *, caddr_t, u_int);
typedef bool_t (*dummyfunc3) (XDR *, int32_t *);
ops.x_putlong = x_putlong;
ops.x_putbytes = x_putbytes;
ops.x_inline = x_inline;
ops.x_getpostn = x_getpostn;
ops.x_setpostn = x_setpostn;
ops.x_destroy = x_destroy;
ops.x_putint32 = x_putint32;
/* the other harmless ones */
ops.x_getlong = (dummyfunc1) harmless;
ops.x_getbytes = (dummyfunc2) harmless;
ops.x_getint32 = (dummyfunc3) harmless;
x.x_op = XDR_ENCODE;
x.x_ops = &ops;
x.x_handy = 0;
x.x_private = (caddr_t) NULL;
x.x_base = (caddr_t) 0;
stat = func (&x, data);
free (x.x_private);
return stat == TRUE ? x.x_handy : 0;
}
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