/*      $NetBSD: xdr_array.c,v 1.12 2000/01/22 22:19:18 mycroft Exp $   */

/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user.
 *
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 *
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 *
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 *
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 *
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */

#include <sys/cdefs.h>
/*
 * xdr_array.c, Generic XDR routines implementation.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 *
 * 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/limits.h>
#include <sys/malloc.h>

#include <rpc/types.h>
#include <rpc/xdr.h>

/*
 * 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 || UINT_MAX/elsize < c) &&
            (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) {
                                printf("xdr_array: out of memory");
                                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);   
}