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/* $NetBSD: udf_bswap.h,v 1.12 2003/04/16 14:27:03 yamt Exp $ */
/*
* Copyright (c) 1998 Manuel Bouyer.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 AUTHOR ``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 AUTHOR 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.
*
* `ported' for UDF by Reinoud Zandijk <reinoud@netbsd.org>
*
*/
#ifndef _UDF_BSWAP_H_
#define _UDF_BSWAP_H_
#if HAVE_ENDIAN_H
#include <endian.h>
#else
#if HAVE_SYS_ENDIAN_H
#include <sys/endian.h>
#else
#if HAVE_MACHINE_ENDIAN_H
#include <machine/endian.h>
#endif
#endif
#endif
/* rest only relevant for big endian machines */
#if (BYTE_ORDER == BIG_ENDIAN)
//#warning BIG ENDIAN
//#if (BYTE_ORDER == LITTLE_ENDIAN) /* ENDIAN SWAP... only for testing!!!!! */
/* inlines for access to swapped data */
static __inline uint16_t udf_rw16 __P((uint16_t));
static __inline uint32_t udf_rw32 __P((uint32_t));
static __inline uint64_t udf_rw64 __P((uint64_t));
#ifdef HAVE_SYS_BSWAP_H
#include <sys/bswap.h>
#endif
#ifdef HAVE_MACHINE_BSWAP_H
#include <machine/bswap.h>
#endif
#if (defined(HAVE_SYS_BSWAP_H) || defined(HAVE_MACHINE_BSWAP_H))
/* bswap macro's defined */
// #warning BSWAP's defined
static __inline uint16_t
udf_rw16(a)
uint16_t a;
{
return bswap16(a);
}
static __inline uint32_t
udf_rw32(a)
uint32_t a;
{
return bswap32(a);
}
static __inline uint64_t
udf_rw64(a)
uint64_t a;
{
return bswap64(a);
}
#else /* no bswap macro's */
// #warning _NO_ BSWAP's defined
union _bswap_data {
uint16_t u16;
uint32_t u32;
uint64_t u64;
uint8_t b[8];
};
static __inline uint16_t
udf_rw16(uint16_t a)
{
union _bswap_data b;
b.u16 = a;
return b.b[0] | (b.b[1] << 8);
}
static __inline uint32_t
udf_rw32(uint32_t a)
{
union _bswap_data b;
b.u32 = a;
return b.b[0] | (b.b[1] << 8) | (b.b[2] << 16) | (b.b[3] << 24);
}
static __inline uint64_t
udf_rw64(uint64_t a)
{
union _bswap_data b;
uint32_t low, high;
b.u64 = a;
high = b.b[4] | (b.b[5] << 8) | (b.b[6] << 16) | (b.b[7] << 24);
low = b.b[0] | (b.b[1] << 8) | (b.b[2] << 16) | (b.b[3] << 24);
return ((uint64_t) low) | ((uint64_t) high) << 32;
}
#endif /* bswap macro's */
#else /* little endian */
#define udf_rw16(a) ((uint16_t)(a))
#define udf_rw32(a) ((uint32_t)(a))
#define udf_rw64(a) ((uint64_t)(a))
#endif
#define udf_add16(a, b) \
(a) = udf_rw16(udf_rw16((a)) + (b))
#define udf_add32(a, b) \
(a) = udf_rw32(udf_rw32((a)) + (b))
#define udf_add64(a, b) \
(a) = udf_rw64(udf_rw64((a)) + (b))
#endif /* !_UDF_BSWAP_H_ */
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