/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Portions of this source code were derived from Berkeley 4.3 BSD
* under license from the Regents of the University of California.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* xdr_mem.c, XDR implementation using memory buffers.
*
* 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 <sys/param.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
static struct xdr_ops *xdrmem_ops(void);
/*
* The procedure xdrmem_create initializes a stream descriptor for a
* memory buffer.
*/
void
xdrmem_create(XDR *xdrs, caddr_t addr, uint_t 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;
xdrs->x_public = NULL;
}
/* ARGSUSED */
static void
xdrmem_destroy(XDR *xdrs)
{
}
static bool_t
xdrmem_getint32(XDR *xdrs, int32_t *int32p)
{
if ((xdrs->x_handy -= (int)sizeof (int32_t)) < 0)
return (FALSE);
/* LINTED pointer alignment */
*int32p = (int32_t)ntohl((uint32_t)(*((int32_t *)(xdrs->x_private))));
xdrs->x_private += sizeof (int32_t);
return (TRUE);
}
static bool_t
xdrmem_putint32(XDR *xdrs, int32_t *int32p)
{
if ((xdrs->x_handy -= (int)sizeof (int32_t)) < 0)
return (FALSE);
/* LINTED pointer alignment */
*(int32_t *)xdrs->x_private = (int32_t)htonl((uint32_t)(*int32p));
xdrs->x_private += sizeof (int32_t);
return (TRUE);
}
static bool_t
xdrmem_getbytes(XDR *xdrs, caddr_t addr, 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(XDR *xdrs, caddr_t addr, int len)
{
if ((xdrs->x_handy -= len) < 0)
return (FALSE);
bcopy(addr, xdrs->x_private, len);
xdrs->x_private += len;
return (TRUE);
}
static uint_t
xdrmem_getpos(XDR *xdrs)
{
return ((uint_t)((uintptr_t)xdrs->x_private - (uintptr_t)xdrs->x_base));
}
static bool_t
xdrmem_setpos(XDR *xdrs, uint_t pos)
{
caddr_t newaddr = xdrs->x_base + pos;
caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
ptrdiff_t diff;
if (newaddr > lastaddr)
return (FALSE);
xdrs->x_private = newaddr;
diff = lastaddr - newaddr;
xdrs->x_handy = (int)diff;
return (TRUE);
}
static rpc_inline_t *
xdrmem_inline(XDR *xdrs, int len)
{
rpc_inline_t *buf = NULL;
if (xdrs->x_handy >= len) {
xdrs->x_handy -= len;
/* LINTED pointer alignment */
buf = (rpc_inline_t *)xdrs->x_private;
xdrs->x_private += len;
}
return (buf);
}
static bool_t
xdrmem_control(XDR *xdrs, int request, void *info)
{
xdr_bytesrec *xptr;
int32_t *int32p;
int len;
switch (request) {
case XDR_GET_BYTES_AVAIL:
xptr = (xdr_bytesrec *)info;
xptr->xc_is_last_record = TRUE;
xptr->xc_num_avail = xdrs->x_handy;
return (TRUE);
case XDR_PEEK:
/*
* Return the next 4 byte unit in the XDR stream.
*/
if (xdrs->x_handy < sizeof (int32_t))
return (FALSE);
int32p = (int32_t *)info;
*int32p = (int32_t)ntohl((uint32_t)
(*((int32_t *)(xdrs->x_private))));
return (TRUE);
case XDR_SKIPBYTES:
/*
* Skip the next N bytes in the XDR stream.
*/
int32p = (int32_t *)info;
len = RNDUP((int)(*int32p));
if ((xdrs->x_handy -= len) < 0)
return (FALSE);
xdrs->x_private += len;
return (TRUE);
}
return (FALSE);
}
static struct xdr_ops *
xdrmem_ops(void)
{
static struct xdr_ops ops;
if (ops.x_getint32 == NULL) {
ops.x_getbytes = xdrmem_getbytes;
ops.x_putbytes = xdrmem_putbytes;
ops.x_getpostn = xdrmem_getpos;
ops.x_setpostn = xdrmem_setpos;
ops.x_inline = xdrmem_inline;
ops.x_destroy = xdrmem_destroy;
ops.x_control = xdrmem_control;
ops.x_getint32 = xdrmem_getint32;
ops.x_putint32 = xdrmem_putint32;
}
return (&ops);
}