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