/*

 * 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_sizeof.c

 *

 * Copyright 1990 Sun Microsystems, Inc.

 *

 * 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>

#include <stdint.h>

#include "un-namespace.h"

/* ARGSUSED */

static bool_t

x_putlong(xdrs, longp)

	XDR *xdrs;

	long *longp;

{

	xdrs->x_handy += BYTES_PER_XDR_UNIT;

	return (TRUE);

}

/* ARGSUSED */

static bool_t

x_putbytes(xdrs, bp, len)

	XDR *xdrs;

	char  *bp;

	u_int len;

{

	xdrs->x_handy += len;

	return (TRUE);

}

static u_int

x_getpostn(xdrs)

	XDR *xdrs;

{

	return (xdrs->x_handy);

}

/* ARGSUSED */

static bool_t

x_setpostn(xdrs, pos)

	XDR *xdrs;

	u_int pos;

{

	/* This is not allowed */

	return (FALSE);

}

static int32_t *

x_inline(xdrs, len)

	XDR *xdrs;

	u_int len;

{

	if (len == 0) {

		return (NULL);

	}

	if (xdrs->x_op != XDR_ENCODE) {

		return (NULL);

	}

	if (len < (uintptr_t)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 */

		if (xdrs->x_private)

			free(xdrs->x_private);

		if ((xdrs->x_private = (caddr_t) malloc(len)) == NULL) {

			xdrs->x_base = 0;

			return (NULL);

		}

		xdrs->x_base = (caddr_t)(uintptr_t)len;

		xdrs->x_handy += len;

		return ((int32_t *) xdrs->x_private);

	}

}

static int

harmless()

{

	/* Always return FALSE/NULL, as the case may be */

	return (0);

}

static void

x_destroy(xdrs)

	XDR *xdrs;

{

	xdrs->x_handy = 0;

	xdrs->x_base = 0;

	if (xdrs->x_private) {

		free(xdrs->x_private);

		xdrs->x_private = NULL;

	}

	return;

}

unsigned long

xdr_sizeof(func, data)

	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);

	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;

	/* the other harmless ones */

	ops.x_getlong =  (dummyfunc1) harmless;

	ops.x_getbytes = (dummyfunc2) 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);

	if (x.x_private)

		free(x.x_private);

	return (stat == TRUE ? (unsigned) x.x_handy: 0);

}