diff --git a/include/ntfs/endians.h b/include/ntfs/endians.h index e69de29b..75f464d1 100644 --- a/include/ntfs/endians.h +++ b/include/ntfs/endians.h @@ -0,0 +1,158 @@ +/* + * endians.h - Definitions related to handling of byte ordering. Part of the + * Linux-NTFS project. + * + * Copyright (c) 2000-2004 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 + +#include "config.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 requiring aligned memory accesses... + */ + +#ifdef HAVE_ENDIAN_H +# include +#endif +#ifdef HAVE_SYS_ENDIAN_H +# include +#endif +#ifdef HAVE_MACHINE_ENDIAN_H +# include +#endif +#ifndef __BYTE_ORDER +# ifdef _BYTE_ORDER +# define __BYTE_ORDER _BYTE_ORDER +# define __LITTLE_ENDIAN _LITTLE_ENDIAN +# define __BIG_ENDIAN _BIG_ENDIAN +# else +# ifdef BYTE_ORDER +# define __BYTE_ORDER BYTE_ORDER +# define __LITTLE_ENDIAN LITTLE_ENDIAN +# define __BIG_ENDIAN BIG_ENDIAN +# endif +# endif +#endif +#ifdef HAVE_BYTESWAP_H +# include +#endif + +#if (__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 (__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) __bswap_constant_16(x) +#define __constant_le32_to_cpu(x) __bswap_constant_32(x) +#define __constant_le64_to_cpu(x) __bswap_constant_64(x) + +#define __constant_cpu_to_le16(x) __bswap_constant_16(x) +#define __constant_cpu_to_le32(x) __bswap_constant_32(x) +#define __constant_cpu_to_le64(x) __bswap_constant_64(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(*(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 */ +