FreeBSD/Linux Kernel Cross Reference
sys/fs/nfs/xdr_subs.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * Rick Macklem at The University of Guelph.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _NFS_XDR_SUBS_H_
    #define _NFS_XDR_SUBS_H_
    
    /*
     * Macros used for conversion to/from xdr representation by nfs...
     * These use the MACHINE DEPENDENT routines ntohl, htonl
     * As defined by "XDR: External Data Representation Standard" RFC1014
     *
     * To simplify the implementation, we use ntohl/htonl even on big-endian
     * machines, and count on them being `#define'd away.  Some of these
     * might be slightly more efficient as quad_t copies on a big-endian,
     * but we cannot count on their alignment anyway.
     */
    
    #define fxdr_unsigned(t, v)     ((t)ntohl((int32_t)(v)))
    #define txdr_unsigned(v)        (htonl((int32_t)(v)))
    
    #define fxdr_nfsv2time(f, t) do {                                       \
        (t)->tv_sec = ntohl(((struct nfsv2_time *)(f))->nfsv2_sec);         \
        if (((struct nfsv2_time *)(f))->nfsv2_usec != 0xffffffff)           \
            (t)->tv_nsec = 1000 * ntohl(((struct nfsv2_time *)(f))->nfsv2_usec); \
        else                                                                \
            (t)->tv_nsec = 0;                                               \
        } while (0)
    
    #define txdr_nfsv2time(f, t) do {                                       \
        ((struct nfsv2_time *)(t))->nfsv2_sec = htonl((f)->tv_sec);         \
        if ((f)->tv_nsec != -1)                                             \
            ((struct nfsv2_time *)(t))->nfsv2_usec = htonl((f)->tv_nsec / 1000); \
        else                                                                \
            ((struct nfsv2_time *)(t))->nfsv2_usec = 0xffffffff;            \
        } while (0)
    
    #define fxdr_nfsv3time(f, t) do {                                       \
            (t)->tv_sec = ntohl(((struct nfsv3_time *)(f))->nfsv3_sec);     \
            (t)->tv_nsec = ntohl(((struct nfsv3_time *)(f))->nfsv3_nsec);   \
        } while (0)
    
    #define txdr_nfsv3time(f, t) do {                                       \
            ((struct nfsv3_time *)(t))->nfsv3_sec = htonl((f)->tv_sec);     \
            ((struct nfsv3_time *)(t))->nfsv3_nsec = htonl((f)->tv_nsec);   \
        } while (0)
    
    #define fxdr_nfsv4time(f, t) do {                                       \
            (t)->tv_sec = ntohl(((struct nfsv4_time *)(f))->nfsv4_sec);     \
            (t)->tv_nsec = (ntohl(((struct nfsv4_time *)(f))->nfsv4_nsec) % \
                    1000000000);                                            \
        } while (0)
    
    #define txdr_nfsv4time(f, t) do {                                       \
            ((struct nfsv4_time *)(t))->nfsv4_highsec = 0;                  \
            ((struct nfsv4_time *)(t))->nfsv4_sec = htonl((f)->tv_sec);     \
            ((struct nfsv4_time *)(t))->nfsv4_nsec = htonl((f)->tv_nsec);   \
        } while (0)
    
    #define fxdr_hyper(f)                                                   \
            ((((u_quad_t)ntohl(((u_int32_t *)(f))[0])) << 32) |             \
             (u_quad_t)(ntohl(((u_int32_t *)(f))[1])))
    
    static inline void
    txdr_hyper(uint64_t f, uint32_t* t)
    {
            t[0] = htonl((u_int32_t)(f >> 32));
           t[1] = htonl((u_int32_t)(f & 0xffffffff));
   }
   
   #endif  /* _NFS_XDR_SUBS_H_ */

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