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nilfs_bswap.h revision 1.1 
      1 /* $NetBSD: nilfs_bswap.h,v 1.1 2009/07/18 16:31:42 reinoud 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  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *	This product includes software developed by the University of
     17  *	California, Berkeley and its contributors.
     18  * 4. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  *
     33  * adapted for NILFS by Reinoud Zandijk <reinoud (at) netbsd.org>
     34  *
     35  */
     36 
     37 #ifndef _FS_NILFS_BSWAP_H_
     38 #define _FS_NILFS_BSWAP_H_
     39 
     40 #include <sys/endian.h>
     41 #include <machine/bswap.h>
     42 #include <sys/bswap.h>
     43 
     44 /* rest only relevant for big endian machines */
     45 #if (BYTE_ORDER == BIG_ENDIAN)
     46 
     47 /* inlines for access to swapped data */
     48 static __inline uint16_t nilfs_rw16(uint16_t);
     49 static __inline uint32_t nilfs_rw32(uint32_t);
     50 static __inline uint64_t nilfs_rw64(uint64_t);
     51 
     52 
     53 static __inline uint16_t
     54 nilfs_rw16(uint16_t a)
     55 {
     56 	return bswap16(a);
     57 }
     58 
     59 
     60 static __inline uint32_t
     61 nilfs_rw32(uint32_t a)
     62 {
     63 	return bswap32(a);
     64 }
     65 
     66 
     67 static __inline uint64_t
     68 nilfs_rw64(uint64_t a)
     69 {
     70 	return bswap64(a);
     71 }
     72 
     73 #else
     74 
     75 #define nilfs_rw16(a) ((uint16_t)(a))
     76 #define nilfs_rw32(a) ((uint32_t)(a))
     77 #define nilfs_rw64(a) ((uint64_t)(a))
     78 
     79 #endif
     80 
     81 
     82 #endif /* !_FS_NILFS_BSWAP_H_ */
     83 
     84