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/*****************************************************************************\
* Copyright (c) 2008 Sun Microsystems, Inc.
* Written by Ricardo Correia <Ricardo.M.Correia@Sun.COM>
*
* This file is part of the SPL, Solaris Porting Layer.
* For details, see <http://zfsonlinux.org/>.
*
* The SPL is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* The SPL is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
\*****************************************************************************/
#ifndef _SPL_RPC_XDR_H
#define _SPL_RPC_XDR_H
#include <sys/types.h>
#include <rpc/types.h>
/*
* XDR enums and types.
*/
enum xdr_op {
XDR_ENCODE,
XDR_DECODE
};
struct xdr_ops;
typedef struct {
struct xdr_ops *x_ops; /* Also used to let caller know if
xdrmem_create() succeeds (sigh..) */
caddr_t x_addr; /* Current buffer addr */
caddr_t x_addr_end; /* End of the buffer */
enum xdr_op x_op; /* Stream direction */
} XDR;
typedef bool_t (*xdrproc_t)(XDR *xdrs, void *ptr);
struct xdr_ops {
bool_t (*xdr_control)(XDR *, int, void *);
bool_t (*xdr_char)(XDR *, char *);
bool_t (*xdr_u_short)(XDR *, unsigned short *);
bool_t (*xdr_u_int)(XDR *, unsigned *);
bool_t (*xdr_u_longlong_t)(XDR *, u_longlong_t *);
bool_t (*xdr_opaque)(XDR *, caddr_t, const uint_t);
bool_t (*xdr_string)(XDR *, char **, const uint_t);
bool_t (*xdr_array)(XDR *, caddr_t *, uint_t *, const uint_t,
const uint_t, const xdrproc_t);
};
/*
* XDR control operator.
*/
#define XDR_GET_BYTES_AVAIL 1
struct xdr_bytesrec {
bool_t xc_is_last_record;
size_t xc_num_avail;
};
/*
* XDR functions.
*/
void xdrmem_create(XDR *xdrs, const caddr_t addr, const uint_t size,
const enum xdr_op op);
#define xdr_destroy(xdrs) ((void) 0) /* Currently not needed. If needed later,
we'll add it to struct xdr_ops */
#define xdr_control(xdrs, req, info) (xdrs)->x_ops->xdr_control((xdrs), \
(req), (info))
/*
* For precaution, the following are defined as static inlines instead of macros
* to get some amount of type safety.
*
* Also, macros wouldn't work in the case where typecasting is done, because it
* must be possible to reference the functions' addresses by these names.
*/
static inline bool_t xdr_char(XDR *xdrs, char *cp)
{
return xdrs->x_ops->xdr_char(xdrs, cp);
}
static inline bool_t xdr_u_short(XDR *xdrs, unsigned short *usp)
{
return xdrs->x_ops->xdr_u_short(xdrs, usp);
}
static inline bool_t xdr_short(XDR *xdrs, short *sp)
{
BUILD_BUG_ON(sizeof(short) != 2);
return xdrs->x_ops->xdr_u_short(xdrs, (unsigned short *) sp);
}
static inline bool_t xdr_u_int(XDR *xdrs, unsigned *up)
{
return xdrs->x_ops->xdr_u_int(xdrs, up);
}
static inline bool_t xdr_int(XDR *xdrs, int *ip)
{
BUILD_BUG_ON(sizeof(int) != 4);
return xdrs->x_ops->xdr_u_int(xdrs, (unsigned *) ip);
}
static inline bool_t xdr_u_longlong_t(XDR *xdrs, u_longlong_t *ullp)
{
return xdrs->x_ops->xdr_u_longlong_t(xdrs, ullp);
}
static inline bool_t xdr_longlong_t(XDR *xdrs, longlong_t *llp)
{
BUILD_BUG_ON(sizeof(longlong_t) != 8);
return xdrs->x_ops->xdr_u_longlong_t(xdrs, (u_longlong_t *) llp);
}
/*
* Fixed-length opaque data.
*/
static inline bool_t xdr_opaque(XDR *xdrs, caddr_t cp, const uint_t cnt)
{
return xdrs->x_ops->xdr_opaque(xdrs, cp, cnt);
}
/*
* Variable-length string.
* The *sp buffer must have (maxsize + 1) bytes.
*/
static inline bool_t xdr_string(XDR *xdrs, char **sp, const uint_t maxsize)
{
return xdrs->x_ops->xdr_string(xdrs, sp, maxsize);
}
/*
* Variable-length arrays.
*/
static inline bool_t xdr_array(XDR *xdrs, caddr_t *arrp, uint_t *sizep,
const uint_t maxsize, const uint_t elsize, const xdrproc_t elproc)
{
return xdrs->x_ops->xdr_array(xdrs, arrp, sizep, maxsize, elsize,
elproc);
}
#endif /* SPL_RPC_XDR_H */
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