/*
 * endians.h - Definitions related to handling of byte ordering. Part of the
 *	       Linux-NTFS project.
 *
 * Copyright (c) 2000-2002 Anton Altaparmakov
 *
 * This program/include file is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program/include file is distributed in the hope that it will be
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program (in the main directory of the Linux-NTFS
 * distribution in the file COPYING); if not, write to the Free Software
 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef _NTFS_ENDIANS_H
#define _NTFS_ENDIANS_H

/*
 * Notes:
 *
 *	We define the conversion functions including typecasts since the
 * defaults don't necessarily perform appropriate typecasts.
 *	Also, using our own functions means that we can change them if it
 * turns out that we do need to use the unaligned access macros on
 * architectures requirering aligned memory accesses...
 */

#include <asm/byteorder.h>

/* Unsigned from LE to CPU conversion. */

#define le16_to_cpu(x)		(u16)__le16_to_cpu((u16)(x))
#define le32_to_cpu(x)		(u32)__le32_to_cpu((u32)(x))
#define le64_to_cpu(x)		(u64)__le64_to_cpu((u64)(x))

#define le16_to_cpup(x)		(u16)__le16_to_cpu(*(u16*)(x))
#define le32_to_cpup(x)		(u32)__le32_to_cpu(*(u32*)(x))
#define le64_to_cpup(x)		(u64)__le64_to_cpu(*(u64*)(x))

/* Signed from LE to CPU conversion. */

#define sle16_to_cpu(x)		(s16)__le16_to_cpu((s16)(x))
#define sle32_to_cpu(x)		(s32)__le32_to_cpu((s32)(x))
#define sle64_to_cpu(x)		(s64)__le64_to_cpu((s64)(x))

#define sle16_to_cpup(x)	(s16)__le16_to_cpu(*(s16*)(x))
#define sle32_to_cpup(x)	(s32)__le32_to_cpu(*(s32*)(x))
#define sle64_to_cpup(x)	(s64)__le64_to_cpu(*(s64*)(x))

/* Unsigned from CPU to LE conversion. */

#define cpu_to_le16(x)		(u16)__cpu_to_le16((u16)(x))
#define cpu_to_le32(x)		(u32)__cpu_to_le32((u32)(x))
#define cpu_to_le64(x)		(u64)__cpu_to_le64((u64)(x))

#define cpu_to_le16p(x)		(u16)__cpu_to_le16(*(u16*)(x))
#define cpu_to_le32p(x)		(u32)__cpu_to_le32(*(u32*)(x))
#define cpu_to_le64p(x)		(u64)__cpu_to_le64(*(u64*)(x))

/* Signed from CPU to LE conversion. */

#define scpu_to_le16(x)		(s16)__cpu_to_le16((s16)(x))
#define scpu_to_le32(x)		(s32)__cpu_to_le32((s32)(x))
#define scpu_to_le64(x)		(s64)__cpu_to_le64((s64)(x))

#define scpu_to_le16p(x)	(s16)__cpu_to_le16(*(s16*)(x))
#define scpu_to_le32p(x)	(s32)__cpu_to_le32(*(s32*)(x))
#define scpu_to_le64p(x)	(s64)__cpu_to_le64(*(s64*)(x))

/*
 * Constant endianness conversion defines.
 */
#define const_le16_to_cpu(x)	__constant_le16_to_cpu(x)
#define const_le32_to_cpu(x)	__constant_le32_to_cpu(x)
#define const_le64_to_cpu(x)	__constant_le64_to_cpu(x)

#define const_cpu_to_le16(x)	__constant_cpu_to_le16(x)
#define const_cpu_to_le32(x)	__constant_cpu_to_le32(x)
#define const_cpu_to_le64(x)	__constant_cpu_to_le64(x)

#endif /* defined _NTFS_ENDIANS_H */