/* @(#)xdr_array.c      2.1 88/07/29 4.0 RPCSRC */
/*
 * Copyright (c) 2010, Oracle America, 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 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.
 */
#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";
#endif

/*
 * xdr_array.c, Generic XDR routines impelmentation.
 *
 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
 * arrays.  See xdr.h for more info on the interface to xdr.
 */

#include <stdio.h>
#include <string.h>
#include <gssrpc/types.h>
#include <gssrpc/xdr.h>

#define LASTUNSIGNED    ((u_int)0-1)


/*
 * XDR an array of arbitrary elements
 * *addrp is a pointer to the array, *sizep is the number of elements.
 * If addrp is NULL (*sizep * elsize) bytes are allocated.
 * elsize is the size (in bytes) of each element, and elproc is the
 * xdr procedure to call to handle each element of the array.
 */
bool_t
xdr_array(
        XDR *xdrs,
        caddr_t *addrp,         /* array pointer */
        u_int *sizep,           /* number of elements */
        u_int maxsize,          /* max numberof elements */
        u_int elsize,           /* size in bytes of each element */
        xdrproc_t elproc        /* xdr routine to handle each element */
        )
{
        u_int i;
        caddr_t target = *addrp;
        u_int c;  /* the actual element count */
        bool_t stat = TRUE;
        u_int nodesize;

        /* like strings, arrays are really counted arrays */
        if (! xdr_u_int(xdrs, sizep)) {
                return (FALSE);
        }
        c = *sizep;
        if ((c > maxsize || c > LASTUNSIGNED / elsize)
            && (xdrs->x_op != XDR_FREE)) {
                return (FALSE);
        }
        nodesize = c * elsize;

        /*
         * if we are deserializing, we may need to allocate an array.
         * We also save time by checking for a null array if we are freeing.
         */
        if (target == NULL)
                switch (xdrs->x_op) {
                case XDR_DECODE:
                        if (c == 0)
                                return (TRUE);
                        *addrp = target = mem_alloc(nodesize);
                        if (target == NULL) {
                                (void) fprintf(stderr,
                                        "xdr_array: out of memory\n");
                                return (FALSE);
                        }
                        memset(target, 0, nodesize);
                        break;

                case XDR_FREE:
                        return (TRUE);

                case XDR_ENCODE:
                        break;
        }

        /*
         * now we xdr each element of array
         */
        for (i = 0; (i < c) && stat; i++) {
                stat = (*elproc)(xdrs, target);
                target += elsize;
        }

        /*
         * the array may need freeing
         */
        if (xdrs->x_op == XDR_FREE) {
                mem_free(*addrp, nodesize);
                *addrp = NULL;
        }
        return (stat);
}

/*
 * xdr_vector():
 *
 * XDR a fixed length array. Unlike variable-length arrays,
 * the storage of fixed length arrays is static and unfreeable.
 * > basep: base of the array
 * > size: size of the array
 * > elemsize: size of each element
 * > xdr_elem: routine to XDR each element
 */
bool_t
xdr_vector(
        XDR *xdrs,
        char *basep,
        u_int nelem,
        u_int elemsize,
        xdrproc_t xdr_elem)
{
        u_int i;
        char *elptr;

        elptr = basep;
        for (i = 0; i < nelem; i++) {
                if (! (*xdr_elem)(xdrs, elptr)) {
                        return(FALSE);
                }
                elptr += elemsize;
        }
        return(TRUE);
}