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