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/* $NetBSD: xdr_mem.c,v 1.15 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
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char *sccsid2 = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
static char *sccsid = "@(#)xdr_mem.c 2.1 88/07/29 4.0 RPCSRC";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/xdr/xdr_mem.c 192971 2009-05-28 08:18:12Z kmacy $");
/*
* 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
static void xdrmem_destroy(XDR *);
static bool_t xdrmem_getlong_aligned(XDR *, long *);
static bool_t xdrmem_putlong_aligned(XDR *, const long *);
static bool_t xdrmem_getlong_unaligned(XDR *, long *);
static bool_t xdrmem_putlong_unaligned(XDR *, const long *);
static bool_t xdrmem_getbytes(XDR *, char *, u_int);
static bool_t xdrmem_putbytes(XDR *, const char *, u_int);
/* XXX: w/64-bit pointers, u_int not enough! */
static u_int xdrmem_getpos(XDR *);
static bool_t xdrmem_setpos(XDR *, u_int);
static int32_t *xdrmem_inline_aligned(XDR *, u_int);
static int32_t *xdrmem_inline_unaligned(XDR *, u_int);
static bool_t xdrmem_control(XDR *xdrs, int request, void *info);
static const 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,
xdrmem_control
};
static const 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,
xdrmem_control
};
/*
* The procedure xdrmem_create initializes a stream descriptor for a
* memory buffer.
*/
void
xdrmem_create(XDR *xdrs, char *addr, u_int size, enum xdr_op op)
{
xdrs->x_op = op;
xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
xdrs->x_private = xdrs->x_base = addr;
xdrs->x_handy = size;
}
/*ARGSUSED*/
static void
xdrmem_destroy(XDR *xdrs)
{
}
static bool_t
xdrmem_getlong_aligned(XDR *xdrs, long *lp)
{
if (xdrs->x_handy < sizeof(int32_t))
return (FALSE);
xdrs->x_handy -= sizeof(int32_t);
*lp = ntohl(*(u_int32_t *)xdrs->x_private);
xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
return (TRUE);
}
static bool_t
xdrmem_putlong_aligned(XDR *xdrs, const long *lp)
{
if (xdrs->x_handy < sizeof(int32_t))
return (FALSE);
xdrs->x_handy -= sizeof(int32_t);
*(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp);
xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
return (TRUE);
}
static bool_t
xdrmem_getlong_unaligned(XDR *xdrs, long *lp)
{
u_int32_t l;
if (xdrs->x_handy < sizeof(int32_t))
return (FALSE);
xdrs->x_handy -= sizeof(int32_t);
memmove(&l, xdrs->x_private, sizeof(int32_t));
*lp = ntohl(l);
xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
return (TRUE);
}
static bool_t
xdrmem_putlong_unaligned(XDR *xdrs, const long *lp)
{
u_int32_t l;
if (xdrs->x_handy < sizeof(int32_t))
return (FALSE);
xdrs->x_handy -= sizeof(int32_t);
l = htonl((u_int32_t)*lp);
memmove(xdrs->x_private, &l, sizeof(int32_t));
xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
return (TRUE);
}
static bool_t
xdrmem_getbytes(XDR *xdrs, char *addr, u_int len)
{
if (xdrs->x_handy < len)
return (FALSE);
xdrs->x_handy -= len;
memmove(addr, xdrs->x_private, len);
xdrs->x_private = (char *)xdrs->x_private + len;
return (TRUE);
}
static bool_t
xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len)
{
if (xdrs->x_handy < len)
return (FALSE);
xdrs->x_handy -= len;
memmove(xdrs->x_private, addr, len);
xdrs->x_private = (char *)xdrs->x_private + len;
return (TRUE);
}
static u_int
xdrmem_getpos(XDR *xdrs)
{
/* XXX w/64-bit pointers, u_int not enough! */
return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base);
}
static bool_t
xdrmem_setpos(XDR *xdrs, u_int pos)
{
char *newaddr = xdrs->x_base + pos;
char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
if (newaddr > lastaddr)
return (FALSE);
xdrs->x_private = newaddr;
xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */
return (TRUE);
}
static int32_t *
xdrmem_inline_aligned(XDR *xdrs, u_int len)
{
int32_t *buf = 0;
if (xdrs->x_handy >= len) {
xdrs->x_handy -= len;
buf = (int32_t *)xdrs->x_private;
xdrs->x_private = (char *)xdrs->x_private + len;
}
return (buf);
}
/* ARGSUSED */
static int32_t *
xdrmem_inline_unaligned(XDR *xdrs, u_int len)
{
return (0);
}
static bool_t
xdrmem_control(XDR *xdrs, int request, void *info)
{
xdr_bytesrec *xptr;
int32_t *l;
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);
l = (int32_t *)info;
*l = (int32_t)ntohl((uint32_t)
(*((int32_t *)(xdrs->x_private))));
return (TRUE);
case XDR_SKIPBYTES:
/*
* Skip the next N bytes in the XDR stream.
*/
l = (int32_t *)info;
len = RNDUP((int)(*l));
if (xdrs->x_handy < len)
return (FALSE);
xdrs->x_handy -= len;
xdrs->x_private = (char *)xdrs->x_private + len;
return (TRUE);
}
return (FALSE);
}