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/*
* 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.h, 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 "mt.h"
#include "rpc_mt.h"
#include <sys/types.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <memory.h>
#include <inttypes.h>
static struct xdr_ops *xdrmem_ops(void);
/*
* Meaning of the private areas of the xdr struct for xdr_mem
* x_base : Base from where the xdr stream starts
* x_private : The current position of the stream.
* x_handy : The size of the stream buffer.
*/
/*
* The procedure xdrmem_create initializes a stream descriptor for a
* memory buffer.
*/
void
xdrmem_create(XDR *xdrs, const caddr_t addr, const uint_t size,
const enum xdr_op op)
{
caddr_t eaddr = addr;
xdrs->x_op = op;
xdrs->x_ops = xdrmem_ops();
xdrs->x_private = xdrs->x_base = 0;
/*
* We check here that the size is with in the range of the
* address space. If not we set x_handy to zero. This will cause
* all xdrmem entry points to fail.
*/
eaddr = addr + size;
if (eaddr < addr)
xdrs->x_handy = 0;
else {
xdrs->x_handy = size;
xdrs->x_private = xdrs->x_base = addr;
}
}
/* ARGSUSED */
static void
xdrmem_destroy(XDR *xdrs)
{
}
static bool_t
xdrmem_getlong(XDR *xdrs, long *lp)
{
if (sizeof (int32_t) > (uint32_t)xdrs->x_handy) {
xdrs->x_private += (uint_t)xdrs->x_handy;
xdrs->x_handy = 0;
return (FALSE);
}
xdrs->x_handy -= sizeof (int32_t);
/* LINTED pointer cast */
*lp = (int32_t)ntohl((uint32_t)(*((int32_t *)(xdrs->x_private))));
xdrs->x_private += sizeof (int32_t);
return (TRUE);
}
static bool_t
xdrmem_putlong(XDR *xdrs, long *lp)
{
#if defined(_LP64)
if ((*lp > INT32_MAX) || (*lp < INT32_MIN))
return (FALSE);
#endif
if ((sizeof (int32_t) > (uint32_t)xdrs->x_handy)) {
xdrs->x_private += (uint_t)xdrs->x_handy;
xdrs->x_handy = 0;
return (FALSE);
}
xdrs->x_handy -= sizeof (int32_t);
/* LINTED pointer cast */
*(int32_t *)xdrs->x_private = (int32_t)htonl((uint32_t)(*lp));
xdrs->x_private += sizeof (int32_t);
return (TRUE);
}
#if defined(_LP64)
static bool_t
xdrmem_getint32(XDR *xdrs, int32_t *ip)
{
if (sizeof (int32_t) > (uint_t)xdrs->x_handy) {
xdrs->x_private += (uint_t)xdrs->x_handy;
xdrs->x_handy = 0;
return (FALSE);
}
xdrs->x_handy -= sizeof (int32_t);
/* LINTED pointer cast */
*ip = (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 *ip)
{
if (sizeof (int32_t) > (uint32_t)xdrs->x_handy) {
xdrs->x_private += (uint_t)xdrs->x_handy;
xdrs->x_handy = 0;
return (FALSE);
}
xdrs->x_handy -= sizeof (int32_t);
/* LINTED pointer cast */
*(int32_t *)xdrs->x_private = (int32_t)htonl((uint32_t)(*ip));
xdrs->x_private += sizeof (int32_t);
return (TRUE);
}
#endif /* _LP64 */
static bool_t
xdrmem_getbytes(XDR *xdrs, caddr_t addr, int len)
{
if ((uint32_t)len > (uint32_t)xdrs->x_handy) {
xdrs->x_private += (uint_t)xdrs->x_handy;
xdrs->x_handy = 0;
return (FALSE);
}
xdrs->x_handy -= len;
(void) memcpy(addr, xdrs->x_private, (uint_t)len);
xdrs->x_private += (uint_t)len;
return (TRUE);
}
static bool_t
xdrmem_putbytes(XDR *xdrs, caddr_t addr, int len)
{
if ((uint32_t)len > (uint32_t)xdrs->x_handy) {
xdrs->x_private += (uint_t)xdrs->x_handy;
xdrs->x_handy = 0;
return (FALSE);
}
xdrs->x_handy -= len;
(void) memcpy(xdrs->x_private, addr, (uint_t)len);
xdrs->x_private += (uint_t)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 + (uint_t)xdrs->x_handy;
if ((long)newaddr > (long)lastaddr)
return (FALSE);
xdrs->x_private = newaddr;
xdrs->x_handy = (int)((uintptr_t)lastaddr - (uintptr_t)newaddr);
return (TRUE);
}
static rpc_inline_t *
xdrmem_inline(XDR *xdrs, int len)
{
rpc_inline_t *buf = 0;
if ((uint32_t)xdrs->x_handy >= (uint32_t)len) {
xdrs->x_handy -= len;
/* LINTED pointer cast */
buf = (rpc_inline_t *)xdrs->x_private;
xdrs->x_private += (uint_t)len;
}
return (buf);
}
static bool_t
xdrmem_control(XDR *xdrs, int request, void *info)
{
xdr_bytesrec *xptr;
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);
default:
return (FALSE);
}
}
static struct xdr_ops *
xdrmem_ops(void)
{
static struct xdr_ops ops;
extern mutex_t ops_lock;
/* VARIABLES PROTECTED BY ops_lock: ops */
(void) mutex_lock(&ops_lock);
if (ops.x_getlong == NULL) {
ops.x_getlong = xdrmem_getlong;
ops.x_putlong = xdrmem_putlong;
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;
#if defined(_LP64)
ops.x_getint32 = xdrmem_getint32;
ops.x_putint32 = xdrmem_putint32;
#endif
}
(void) mutex_unlock(&ops_lock);
return (&ops);
}
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