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