/* * endians.h - Definitions related to handling of byte ordering. * Originated from 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 NTFS-3G * 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 #endif #ifdef HAVE_SYS_ENDIAN_H #include #endif #ifdef HAVE_MACHINE_ENDIAN_H #include #endif #ifdef HAVE_SYS_BYTEORDER_H #include #endif #ifdef HAVE_SYS_PARAM_H #include #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 #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 */