113 lines
3.8 KiB
C
113 lines
3.8 KiB
C
/*
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* endians.h - Definitions related to handling of byte ordering. Part of the
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* Linux-NTFS project.
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*
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* Copyright (c) 2000-2003 Anton Altaparmakov
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (in the main directory of the Linux-NTFS
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _NTFS_ENDIANS_H
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#define _NTFS_ENDIANS_H
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/*
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* Notes:
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*
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* We define the conversion functions including typecasts since the
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* defaults don't necessarily perform appropriate typecasts.
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* Also, using our own functions means that we can change them if it
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* turns out that we do need to use the unaligned access macros on
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* architectures requirering aligned memory accesses...
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*/
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#include <asm/byteorder.h>
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/* The following are not defined on Cygwin... Luckily Cygwin is LE already. */
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#ifdef __CYGWIN32__
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#define __le16_to_cpu(x) (x)
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#define __le32_to_cpu(x) (x)
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#define __le64_to_cpu(x) (x)
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#define __cpu_to_le16(x) (x)
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#define __cpu_to_le32(x) (x)
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#define __cpu_to_le64(x) (x)
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#define __constant_le16_to_cpu(x) (x)
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#define __constant_le32_to_cpu(x) (x)
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#define __constant_le64_to_cpu(x) (x)
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#define __constant_cpu_to_le16(x) (x)
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#define __constant_cpu_to_le32(x) (x)
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#define __constant_cpu_to_le64(x) (x)
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#endif /* __CYGWIN32__ */
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/* Unsigned from LE to CPU conversion. */
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#define le16_to_cpu(x) (u16)__le16_to_cpu((u16)(x))
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#define le32_to_cpu(x) (u32)__le32_to_cpu((u32)(x))
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#define le64_to_cpu(x) (u64)__le64_to_cpu((u64)(x))
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#define le16_to_cpup(x) (u16)__le16_to_cpu(*(u16*)(x))
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#define le32_to_cpup(x) (u32)__le32_to_cpu(*(u32*)(x))
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#define le64_to_cpup(x) (u64)__le64_to_cpu(*(u64*)(x))
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/* Signed from LE to CPU conversion. */
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#define sle16_to_cpu(x) (s16)__le16_to_cpu((s16)(x))
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#define sle32_to_cpu(x) (s32)__le32_to_cpu((s32)(x))
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#define sle64_to_cpu(x) (s64)__le64_to_cpu((s64)(x))
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#define sle16_to_cpup(x) (s16)__le16_to_cpu(*(s16*)(x))
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#define sle32_to_cpup(x) (s32)__le32_to_cpu(*(s32*)(x))
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#define sle64_to_cpup(x) (s64)__le64_to_cpu(*(s64*)(x))
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/* Unsigned from CPU to LE conversion. */
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#define cpu_to_le16(x) (u16)__cpu_to_le16((u16)(x))
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#define cpu_to_le32(x) (u32)__cpu_to_le32((u32)(x))
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#define cpu_to_le64(x) (u64)__cpu_to_le64((u64)(x))
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#define cpu_to_le16p(x) (u16)__cpu_to_le16(*(u16*)(x))
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#define cpu_to_le32p(x) (u32)__cpu_to_le32(*(u32*)(x))
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#define cpu_to_le64p(x) (u64)__cpu_to_le64(*(u64*)(x))
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/* Signed from CPU to LE conversion. */
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#define scpu_to_le16(x) (s16)__cpu_to_le16((s16)(x))
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#define scpu_to_le32(x) (s32)__cpu_to_le32((s32)(x))
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#define scpu_to_le64(x) (s64)__cpu_to_le64((s64)(x))
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#define scpu_to_le16p(x) (s16)__cpu_to_le16(*(s16*)(x))
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#define scpu_to_le32p(x) (s32)__cpu_to_le32(*(s32*)(x))
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#define scpu_to_le64p(x) (s64)__cpu_to_le64(*(s64*)(x))
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/*
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* Constant endianness conversion defines.
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*/
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#define const_le16_to_cpu(x) __constant_le16_to_cpu(x)
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#define const_le32_to_cpu(x) __constant_le32_to_cpu(x)
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#define const_le64_to_cpu(x) __constant_le64_to_cpu(x)
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#define const_cpu_to_le16(x) __constant_cpu_to_le16(x)
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#define const_cpu_to_le32(x) __constant_cpu_to_le32(x)
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#define const_cpu_to_le64(x) __constant_cpu_to_le64(x)
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#endif /* defined _NTFS_ENDIANS_H */
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