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204 lines
6.9 KiB
C
204 lines
6.9 KiB
C
/*
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* endians.h - Definitions related to handling of byte ordering.
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* Originated from the Linux-NTFS project.
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*
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* Copyright (c) 2000-2005 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 NTFS-3G
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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/*
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* Notes:
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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 requiring aligned memory accesses...
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*/
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#ifdef HAVE_ENDIAN_H
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#include <endian.h>
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#endif
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#ifdef HAVE_SYS_ENDIAN_H
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#include <sys/endian.h>
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#endif
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#ifdef HAVE_MACHINE_ENDIAN_H
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#include <machine/endian.h>
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#endif
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#ifdef HAVE_SYS_BYTEORDER_H
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#include <sys/byteorder.h>
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#endif
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#ifdef HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#ifndef __BYTE_ORDER
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# if defined(_BYTE_ORDER)
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# define __BYTE_ORDER _BYTE_ORDER
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# define __LITTLE_ENDIAN _LITTLE_ENDIAN
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# define __BIG_ENDIAN _BIG_ENDIAN
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# elif defined(BYTE_ORDER)
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# define __BYTE_ORDER BYTE_ORDER
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# define __LITTLE_ENDIAN LITTLE_ENDIAN
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# define __BIG_ENDIAN BIG_ENDIAN
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# elif defined(__BYTE_ORDER__)
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# define __BYTE_ORDER __BYTE_ORDER__
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# define __LITTLE_ENDIAN __LITTLE_ENDIAN__
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# define __BIG_ENDIAN __BIG_ENDIAN__
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# elif (defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN)) || \
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defined(WORDS_LITTLEENDIAN)
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# define __BYTE_ORDER 1
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# define __LITTLE_ENDIAN 1
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# define __BIG_ENDIAN 0
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# elif (!defined(_LITTLE_ENDIAN) && defined(_BIG_ENDIAN)) || \
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defined(WORDS_BIGENDIAN)
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# define __BYTE_ORDER 0
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# define __LITTLE_ENDIAN 1
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# define __BIG_ENDIAN 0
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# else
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# error "__BYTE_ORDER is not defined."
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# endif
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#endif
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#define __ntfs_bswap_constant_16(x) \
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(u16)((((u16)(x) & 0xff00) >> 8) | \
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(((u16)(x) & 0x00ff) << 8))
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#define __ntfs_bswap_constant_32(x) \
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(u32)((((u32)(x) & 0xff000000u) >> 24) | \
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(((u32)(x) & 0x00ff0000u) >> 8) | \
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(((u32)(x) & 0x0000ff00u) << 8) | \
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(((u32)(x) & 0x000000ffu) << 24))
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#define __ntfs_bswap_constant_64(x) \
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(u64)((((u64)(x) & 0xff00000000000000ull) >> 56) | \
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(((u64)(x) & 0x00ff000000000000ull) >> 40) | \
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(((u64)(x) & 0x0000ff0000000000ull) >> 24) | \
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(((u64)(x) & 0x000000ff00000000ull) >> 8) | \
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(((u64)(x) & 0x00000000ff000000ull) << 8) | \
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(((u64)(x) & 0x0000000000ff0000ull) << 24) | \
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(((u64)(x) & 0x000000000000ff00ull) << 40) | \
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(((u64)(x) & 0x00000000000000ffull) << 56))
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#ifdef HAVE_BYTESWAP_H
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# include <byteswap.h>
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#else
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# define bswap_16(x) __ntfs_bswap_constant_16(x)
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# define bswap_32(x) __ntfs_bswap_constant_32(x)
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# define bswap_64(x) __ntfs_bswap_constant_64(x)
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#endif
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#if defined(__LITTLE_ENDIAN) && (__BYTE_ORDER == __LITTLE_ENDIAN)
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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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#elif defined(__BIG_ENDIAN) && (__BYTE_ORDER == __BIG_ENDIAN)
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#define __le16_to_cpu(x) bswap_16(x)
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#define __le32_to_cpu(x) bswap_32(x)
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#define __le64_to_cpu(x) bswap_64(x)
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#define __cpu_to_le16(x) bswap_16(x)
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#define __cpu_to_le32(x) bswap_32(x)
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#define __cpu_to_le64(x) bswap_64(x)
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#define __constant_le16_to_cpu(x) __ntfs_bswap_constant_16((u16)(x))
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#define __constant_le32_to_cpu(x) __ntfs_bswap_constant_32((u32)(x))
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#define __constant_le64_to_cpu(x) __ntfs_bswap_constant_64((u64)(x))
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#define __constant_cpu_to_le16(x) __ntfs_bswap_constant_16((u16)(x))
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#define __constant_cpu_to_le32(x) __ntfs_bswap_constant_32((u32)(x))
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#define __constant_cpu_to_le64(x) __ntfs_bswap_constant_64((u64)(x))
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#else
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#error "You must define __BYTE_ORDER to be __LITTLE_ENDIAN or __BIG_ENDIAN."
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#endif
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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(*(const u16*)(x))
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#define le32_to_cpup(x) (u32)__le32_to_cpu(*(const u32*)(x))
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#define le64_to_cpup(x) (u64)__le64_to_cpu(*(const 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 cpu_to_sle16(x) (s16)__cpu_to_le16((s16)(x))
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#define cpu_to_sle32(x) (s32)__cpu_to_le32((s32)(x))
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#define cpu_to_sle64(x) (s64)__cpu_to_le64((s64)(x))
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#define cpu_to_sle16p(x) (s16)__cpu_to_le16(*(s16*)(x))
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#define cpu_to_sle32p(x) (s32)__cpu_to_le32(*(s32*)(x))
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#define cpu_to_sle64p(x) (s64)__cpu_to_le64(*(s64*)(x))
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/* Constant endianness conversion defines. */
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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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