xdr_sizeof.c

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/*
 * Copyright (c) 2009, Sun Microsystems, Inc.
 * All rights reserved.
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 * - 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
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 * - 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
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/*
 * xdr_sizeof.c
 *
 * Copyright 1990 Sun Microsystems, Inc.
 *
 * General purpose routine to see how much space something will use
 * when serialized using XDR.
 */
 
//#include <sys/cdefs.h>
 
#include <wintirpc.h>
#include "namespace.h"
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <sys/types.h>
#include <stdlib.h>
#include "un-namespace.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(XDR *xdrs)
{
    return (xdrs->x_handy);
}
 
/* ARGSUSED */
static bool_t
x_setpostn(XDR *xdrs, u_int pos)
{
    /* 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 < PtrToUlong(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 = UIntToPtr(len);
        //xdrs->x_base = len;   // XXX Is this right???
        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(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);
}