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      1 /* $NetBSD: nilfs_bswap.h,v 1.2 2009/10/22 21:50:01 bouyer Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1998 Manuel Bouyer.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  *
     26  * adapted for NILFS by Reinoud Zandijk <reinoud (at) netbsd.org>
     27  *
     28  */
     29 
     30 #ifndef _FS_NILFS_BSWAP_H_
     31 #define _FS_NILFS_BSWAP_H_
     32 
     33 #include <sys/endian.h>
     34 #include <machine/bswap.h>
     35 #include <sys/bswap.h>
     36 
     37 /* rest only relevant for big endian machines */
     38 #if (BYTE_ORDER == BIG_ENDIAN)
     39 
     40 /* inlines for access to swapped data */
     41 static __inline uint16_t nilfs_rw16(uint16_t);
     42 static __inline uint32_t nilfs_rw32(uint32_t);
     43 static __inline uint64_t nilfs_rw64(uint64_t);
     44 
     45 
     46 static __inline uint16_t
     47 nilfs_rw16(uint16_t a)
     48 {
     49 	return bswap16(a);
     50 }
     51 
     52 
     53 static __inline uint32_t
     54 nilfs_rw32(uint32_t a)
     55 {
     56 	return bswap32(a);
     57 }
     58 
     59 
     60 static __inline uint64_t
     61 nilfs_rw64(uint64_t a)
     62 {
     63 	return bswap64(a);
     64 }
     65 
     66 #else
     67 
     68 #define nilfs_rw16(a) ((uint16_t)(a))
     69 #define nilfs_rw32(a) ((uint32_t)(a))
     70 #define nilfs_rw64(a) ((uint64_t)(a))
     71 
     72 #endif
     73 
     74 
     75 #endif /* !_FS_NILFS_BSWAP_H_ */
     76 
     77