xdr_mem.c
/* @(#)xdr_mem.c 2.1 88/07/29 4.0 RPCSRC */
/*
* 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
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*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
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*/
#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
#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 <rpc/types.h>
#include <rpc/xdr.h>
#include <netinet/in.h>
#include <strings.h>

static bool_t xdrmem_getlong();
static bool_t xdrmem_putlong();
static bool_t xdrmem_getbytes();
static bool_t xdrmem_putbytes();
static u_int xdrmem_getpos();
static bool_t xdrmem_setpos();
static long * xdrmem_inline();
static void xdrmem_destroy();

static struct xdr_ops xdrmem_ops = {
xdrmem_getlong,
xdrmem_putlong,
xdrmem_getbytes,
xdrmem_putbytes,
xdrmem_getpos,
xdrmem_setpos,
xdrmem_inline,
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 = &xdrmem_ops;
xdrs->x_private = xdrs->x_base = addr;
xdrs->x_handy = size;
}

static void
xdrmem_destroy(/*xdrs*/)
/*XDR *xdrs;*/
{
}

static bool_t
xdrmem_getlong(xdrs, lp)
register XDR *xdrs;
long *lp;
{

if ((xdrs->x_handy -= sizeof(long)) < 0)
return (FALSE);
*lp = (long)ntohl((u_long)(*((long *)(xdrs->x_private))));
xdrs->x_private += sizeof(long);
return (TRUE);
}

static bool_t
xdrmem_putlong(xdrs, lp)
register XDR *xdrs;
long *lp;
{

if ((xdrs->x_handy -= sizeof(long)) < 0)
return (FALSE);
*(long *)xdrs->x_private = (long)htonl((u_long)(*lp));
xdrs->x_private += sizeof(long);
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);
bcopy(xdrs->x_private, addr, 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);
bcopy(addr, xdrs->x_private, len);
xdrs->x_private += len;
return (TRUE);
}

static u_int
xdrmem_getpos(xdrs)
register XDR *xdrs;
{

return ((u_int)xdrs->x_private - (u_int)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 = (int)lastaddr - (int)newaddr;
return (TRUE);
}

static long *
xdrmem_inline(xdrs, len)
register XDR *xdrs;
int len;
{
long *buf = 0;

if (xdrs->x_handy >= len) {
xdrs->x_handy -= len;
buf = (long *) xdrs->x_private;
xdrs->x_private += len;
}
return (buf);
}