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/*
* Copyright (c) 2009, Sun Microsystems, Inc.
* All rights reserved.
*
* 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 Sun Microsystems, 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.
*/
/*
* xdr_reference.c, Generic XDR routines impelmentation.
*
* Copyright (C) 1987, Sun Microsystems, Inc.
*
* These are the "non-trivial" xdr primitives used to serialize and de-serialize
* "pointers". See xdr.h for more info on the interface to xdr.
*/
#define _DEFAULT_SOURCE
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include "xdr_private.h"
#define LASTUNSIGNED ((u_int)0-1)
/*
* XDR an indirect pointer
* xdr_reference is for recursively translating a structure that is
* referenced by a pointer inside the structure that is currently being
* translated. pp references a pointer to storage. If *pp is null
* the necessary storage is allocated.
* size is the sizeof the referneced structure.
* proc is the routine to handle the referenced structure.
*/
bool_t
xdr_reference (XDR * xdrs,
caddr_t * pp,
u_int size,
xdrproc_t proc)
{
caddr_t loc = *pp;
bool_t stat;
if (loc == NULL)
switch (xdrs->x_op)
{
case XDR_FREE:
return TRUE;
case XDR_DECODE:
*pp = loc = (caddr_t) mem_alloc (size);
if (loc == NULL)
{
xdr_warnx ("xdr_reference: out of memory");
errno = ENOMEM;
return FALSE;
}
memset (loc, 0, size);
break;
case XDR_ENCODE:
break;
}
stat = (*proc) (xdrs, loc, LASTUNSIGNED);
if (xdrs->x_op == XDR_FREE)
{
mem_free (loc, size);
*pp = NULL;
}
return stat;
}
/*
* xdr_pointer():
*
* XDR a pointer to a possibly recursive data structure. This
* differs with xdr_reference in that it can serialize/deserialiaze
* trees correctly.
*
* What's sent is actually a union:
*
* union object_pointer switch (boolean b) {
* case TRUE: object_data data;
* case FALSE: void nothing;
* }
*
* > objpp: Pointer to the pointer to the object.
* > obj_size: size of the object.
* > xdr_obj: routine to XDR an object.
*
*/
bool_t
xdr_pointer (XDR * xdrs,
char **objpp,
u_int obj_size,
xdrproc_t xdr_obj)
{
bool_t more_data;
more_data = (*objpp != NULL);
if (!xdr_bool (xdrs, &more_data))
{
return FALSE;
}
if (!more_data)
{
*objpp = NULL;
return TRUE;
}
return (xdr_reference (xdrs, objpp, obj_size, xdr_obj));
}
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