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/*

 * 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

 */

#if defined(LIBC_SCCS) && !defined(lint)

/*static char *sccsid = "from: @(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";*/

/*static char *sccsid = "from: @(#)xdr_mem.c    2.1 88/07/29 4.0 RPCSRC";*/

static char *rcsid = "$FreeBSD: src/lib/libc/xdr/xdr_mem.c,v 1.8 1999/08/28 00:02:56 peter Exp $";

#endif

/*

 * xdr_mem.h, XDR implementation using memory buffers.

 *

 * Copyright (C) 1984, Sun Microsystems, Inc.

 *

 * If you have some data to be interpreted as external data representation

 * or to be converted to external data representation in a memory buffer,

 * then this is the package for you.

 *

 */

#include <string.h>

#include <rpc/types.h>

#include <rpc/xdr.h>

#include <netinet/in.h>

static bool_t   xdrmem_getlong_aligned();

static bool_t   xdrmem_putlong_aligned();

static bool_t   xdrmem_getlong_unaligned();

static bool_t   xdrmem_putlong_unaligned();

static bool_t   xdrmem_getbytes();

static bool_t   xdrmem_putbytes();

static u_int    xdrmem_getpos(); /* XXX w/64-bit pointers, u_int not enough! */

static bool_t   xdrmem_setpos();

static int32_t *xdrmem_inline_aligned();

static int32_t *xdrmem_inline_unaligned();

static void     xdrmem_destroy();

static struct   xdr_ops xdrmem_ops_aligned = {

        xdrmem_getlong_aligned,

        xdrmem_putlong_aligned,

        xdrmem_getbytes,

        xdrmem_putbytes,

        xdrmem_getpos,

        xdrmem_setpos,

        xdrmem_inline_aligned,

        xdrmem_destroy

};

static struct   xdr_ops xdrmem_ops_unaligned = {

        xdrmem_getlong_unaligned,

        xdrmem_putlong_unaligned,

        xdrmem_getbytes,

        xdrmem_putbytes,

        xdrmem_getpos,

        xdrmem_setpos,

        xdrmem_inline_unaligned,

        xdrmem_destroy

};

/*

 * The procedure xdrmem_create initializes a stream descriptor for a

 * memory buffer.

 */

void

xdrmem_create(xdrs, addr, size, op)

        register XDR *xdrs;

        caddr_t addr;

        u_int size;

        enum xdr_op op;

{

        xdrs->x_op = op;

        xdrs->x_ops = ((size_t)addr & (sizeof(int32_t) - 1))

                ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;

        xdrs->x_private = xdrs->x_base = addr;

        xdrs->x_handy = size;

}

static void

xdrmem_destroy(/*xdrs*/)

        /*XDR *xdrs;*/

{

}

static bool_t

xdrmem_getlong_aligned(xdrs, lp)

        register XDR *xdrs;

        long *lp;

{

        if ((xdrs->x_handy -= sizeof(int32_t)) < 0)

                return (FALSE);

        *lp = ntohl(*(int32_t *)(xdrs->x_private));

        xdrs->x_private += sizeof(int32_t);

        return (TRUE);

}

static bool_t

xdrmem_putlong_aligned(xdrs, lp)

        register XDR *xdrs;

        long *lp;

{

        if ((xdrs->x_handy -= sizeof(int32_t)) < 0)

                return (FALSE);

        *(int32_t *)xdrs->x_private = htonl(*lp);

        xdrs->x_private += sizeof(int32_t);

        return (TRUE);

}

static bool_t

xdrmem_getlong_unaligned(xdrs, lp)

        register XDR *xdrs;

        long *lp;

{

        int32_t l;

        if ((xdrs->x_handy -= sizeof(int32_t)) < 0)

                return (FALSE);

        memcpy(&l, xdrs->x_private, sizeof(int32_t));

        *lp = ntohl(l);

        xdrs->x_private += sizeof(int32_t);

        return (TRUE);

}

static bool_t

xdrmem_putlong_unaligned(xdrs, lp)

        register XDR *xdrs;

        long *lp;

{

        int32_t l;

        if ((xdrs->x_handy -= sizeof(int32_t)) < 0)

                return (FALSE);

        l = htonl(*lp);

        memcpy(xdrs->x_private, &l, sizeof(int32_t));

        xdrs->x_private += sizeof(int32_t);

        return (TRUE);

}

static bool_t

xdrmem_getbytes(xdrs, addr, len)

        register XDR *xdrs;

        caddr_t addr;

        register u_int len;

{

        if ((xdrs->x_handy -= len) < 0)

                return (FALSE);

        memcpy(addr, xdrs->x_private, len);

        xdrs->x_private += len;

        return (TRUE);

}

static bool_t

xdrmem_putbytes(xdrs, addr, len)

        register XDR *xdrs;

        caddr_t addr;

        register u_int len;

{

        if ((xdrs->x_handy -= len) < 0)

                return (FALSE);

        memcpy(xdrs->x_private, addr, len);

        xdrs->x_private += len;

        return (TRUE);

}

static u_int

xdrmem_getpos(xdrs)

        register XDR *xdrs;

{

        /* XXX w/64-bit pointers, u_int not enough! */

        return ((u_long)xdrs->x_private - (u_long)xdrs->x_base);

}

static bool_t

xdrmem_setpos(xdrs, pos)

        register XDR *xdrs;

        u_int pos;

{

        register caddr_t newaddr = xdrs->x_base + pos;

        register caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;

        if ((long)newaddr > (long)lastaddr)

                return (FALSE);

        xdrs->x_private = newaddr;

        xdrs->x_handy = (long)lastaddr - (long)newaddr;

        return (TRUE);

}

static int32_t *

xdrmem_inline_aligned(xdrs, len)

        register XDR *xdrs;

        int len;

{

        int32_t *buf = 0;

        if (xdrs->x_handy >= len) {

                xdrs->x_handy -= len;

                buf = (int32_t *) xdrs->x_private;

                xdrs->x_private += len;

        }

        return (buf);

}

static int32_t *

xdrmem_inline_unaligned(xdrs, len)

        register XDR *xdrs;

        int len;

{

        return (0);

}