blob: 397f1c20b911c7ffd13ae9c39a346f2e7e69e4ab
| 1 | /* |
| 2 | * endians.h - Definitions related to handling of byte ordering. |
| 3 | * Originated from the Linux-NTFS project. |
| 4 | * |
| 5 | * Copyright (c) 2000-2005 Anton Altaparmakov |
| 6 | * |
| 7 | * This program/include file is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License as published |
| 9 | * by the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program/include file is distributed in the hope that it will be |
| 13 | * useful, but WITHOUT ANY WARRANTY; without even the implied warranty |
| 14 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program (in the main directory of the NTFS-3G |
| 19 | * distribution in the file COPYING); if not, write to the Free Software |
| 20 | * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | */ |
| 22 | |
| 23 | #ifndef _NTFS_ENDIANS_H |
| 24 | #define _NTFS_ENDIANS_H |
| 25 | |
| 26 | #ifdef HAVE_CONFIG_H |
| 27 | #include "config.h" |
| 28 | #endif |
| 29 | |
| 30 | /* |
| 31 | * Notes: |
| 32 | * We define the conversion functions including typecasts since the |
| 33 | * defaults don't necessarily perform appropriate typecasts. |
| 34 | * Also, using our own functions means that we can change them if it |
| 35 | * turns out that we do need to use the unaligned access macros on |
| 36 | * architectures requiring aligned memory accesses... |
| 37 | */ |
| 38 | |
| 39 | #ifdef HAVE_ENDIAN_H |
| 40 | #include <endian.h> |
| 41 | #endif |
| 42 | #ifdef HAVE_SYS_ENDIAN_H |
| 43 | #include <sys/endian.h> |
| 44 | #endif |
| 45 | #ifdef HAVE_MACHINE_ENDIAN_H |
| 46 | #include <machine/endian.h> |
| 47 | #endif |
| 48 | #ifdef HAVE_SYS_BYTEORDER_H |
| 49 | #include <sys/byteorder.h> |
| 50 | #endif |
| 51 | #ifdef HAVE_SYS_PARAM_H |
| 52 | #include <sys/param.h> |
| 53 | #endif |
| 54 | |
| 55 | #ifndef __BYTE_ORDER |
| 56 | # if defined(_BYTE_ORDER) |
| 57 | # define __BYTE_ORDER _BYTE_ORDER |
| 58 | # define __LITTLE_ENDIAN _LITTLE_ENDIAN |
| 59 | # define __BIG_ENDIAN _BIG_ENDIAN |
| 60 | # elif defined(BYTE_ORDER) |
| 61 | # define __BYTE_ORDER BYTE_ORDER |
| 62 | # define __LITTLE_ENDIAN LITTLE_ENDIAN |
| 63 | # define __BIG_ENDIAN BIG_ENDIAN |
| 64 | # elif defined(__BYTE_ORDER__) |
| 65 | # define __BYTE_ORDER __BYTE_ORDER__ |
| 66 | # define __LITTLE_ENDIAN __LITTLE_ENDIAN__ |
| 67 | # define __BIG_ENDIAN __BIG_ENDIAN__ |
| 68 | # elif (defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN)) || \ |
| 69 | defined(WORDS_LITTLEENDIAN) |
| 70 | # define __BYTE_ORDER 1 |
| 71 | # define __LITTLE_ENDIAN 1 |
| 72 | # define __BIG_ENDIAN 0 |
| 73 | # elif (!defined(_LITTLE_ENDIAN) && defined(_BIG_ENDIAN)) || \ |
| 74 | defined(WORDS_BIGENDIAN) |
| 75 | # define __BYTE_ORDER 0 |
| 76 | # define __LITTLE_ENDIAN 1 |
| 77 | # define __BIG_ENDIAN 0 |
| 78 | # else |
| 79 | # error "__BYTE_ORDER is not defined." |
| 80 | # endif |
| 81 | #endif |
| 82 | |
| 83 | #define __ntfs_bswap_constant_16(x) \ |
| 84 | (u16)((((u16)(x) & 0xff00) >> 8) | \ |
| 85 | (((u16)(x) & 0x00ff) << 8)) |
| 86 | |
| 87 | #define __ntfs_bswap_constant_32(x) \ |
| 88 | (u32)((((u32)(x) & 0xff000000u) >> 24) | \ |
| 89 | (((u32)(x) & 0x00ff0000u) >> 8) | \ |
| 90 | (((u32)(x) & 0x0000ff00u) << 8) | \ |
| 91 | (((u32)(x) & 0x000000ffu) << 24)) |
| 92 | |
| 93 | #define __ntfs_bswap_constant_64(x) \ |
| 94 | (u64)((((u64)(x) & 0xff00000000000000ull) >> 56) | \ |
| 95 | (((u64)(x) & 0x00ff000000000000ull) >> 40) | \ |
| 96 | (((u64)(x) & 0x0000ff0000000000ull) >> 24) | \ |
| 97 | (((u64)(x) & 0x000000ff00000000ull) >> 8) | \ |
| 98 | (((u64)(x) & 0x00000000ff000000ull) << 8) | \ |
| 99 | (((u64)(x) & 0x0000000000ff0000ull) << 24) | \ |
| 100 | (((u64)(x) & 0x000000000000ff00ull) << 40) | \ |
| 101 | (((u64)(x) & 0x00000000000000ffull) << 56)) |
| 102 | |
| 103 | #ifdef HAVE_BYTESWAP_H |
| 104 | # include <byteswap.h> |
| 105 | #else |
| 106 | # define bswap_16(x) __ntfs_bswap_constant_16(x) |
| 107 | # define bswap_32(x) __ntfs_bswap_constant_32(x) |
| 108 | # define bswap_64(x) __ntfs_bswap_constant_64(x) |
| 109 | #endif |
| 110 | |
| 111 | #if defined(__LITTLE_ENDIAN) && (__BYTE_ORDER == __LITTLE_ENDIAN) |
| 112 | |
| 113 | #define __le16_to_cpu(x) (x) |
| 114 | #define __le32_to_cpu(x) (x) |
| 115 | #define __le64_to_cpu(x) (x) |
| 116 | |
| 117 | #define __cpu_to_le16(x) (x) |
| 118 | #define __cpu_to_le32(x) (x) |
| 119 | #define __cpu_to_le64(x) (x) |
| 120 | |
| 121 | #define __constant_le16_to_cpu(x) (x) |
| 122 | #define __constant_le32_to_cpu(x) (x) |
| 123 | #define __constant_le64_to_cpu(x) (x) |
| 124 | |
| 125 | #define __constant_cpu_to_le16(x) (x) |
| 126 | #define __constant_cpu_to_le32(x) (x) |
| 127 | #define __constant_cpu_to_le64(x) (x) |
| 128 | |
| 129 | #elif defined(__BIG_ENDIAN) && (__BYTE_ORDER == __BIG_ENDIAN) |
| 130 | |
| 131 | #define __le16_to_cpu(x) bswap_16(x) |
| 132 | #define __le32_to_cpu(x) bswap_32(x) |
| 133 | #define __le64_to_cpu(x) bswap_64(x) |
| 134 | |
| 135 | #define __cpu_to_le16(x) bswap_16(x) |
| 136 | #define __cpu_to_le32(x) bswap_32(x) |
| 137 | #define __cpu_to_le64(x) bswap_64(x) |
| 138 | |
| 139 | #define __constant_le16_to_cpu(x) __ntfs_bswap_constant_16((u16)(x)) |
| 140 | #define __constant_le32_to_cpu(x) __ntfs_bswap_constant_32((u32)(x)) |
| 141 | #define __constant_le64_to_cpu(x) __ntfs_bswap_constant_64((u64)(x)) |
| 142 | |
| 143 | #define __constant_cpu_to_le16(x) __ntfs_bswap_constant_16((u16)(x)) |
| 144 | #define __constant_cpu_to_le32(x) __ntfs_bswap_constant_32((u32)(x)) |
| 145 | #define __constant_cpu_to_le64(x) __ntfs_bswap_constant_64((u64)(x)) |
| 146 | |
| 147 | #else |
| 148 | |
| 149 | #error "You must define __BYTE_ORDER to be __LITTLE_ENDIAN or __BIG_ENDIAN." |
| 150 | |
| 151 | #endif |
| 152 | |
| 153 | /* Unsigned from LE to CPU conversion. */ |
| 154 | |
| 155 | #define le16_to_cpu(x) (u16)__le16_to_cpu((u16)(x)) |
| 156 | #define le32_to_cpu(x) (u32)__le32_to_cpu((u32)(x)) |
| 157 | #define le64_to_cpu(x) (u64)__le64_to_cpu((u64)(x)) |
| 158 | |
| 159 | #define le16_to_cpup(x) (u16)__le16_to_cpu(*(const u16*)(x)) |
| 160 | #define le32_to_cpup(x) (u32)__le32_to_cpu(*(const u32*)(x)) |
| 161 | #define le64_to_cpup(x) (u64)__le64_to_cpu(*(const u64*)(x)) |
| 162 | |
| 163 | /* Signed from LE to CPU conversion. */ |
| 164 | |
| 165 | #define sle16_to_cpu(x) (s16)__le16_to_cpu((s16)(x)) |
| 166 | #define sle32_to_cpu(x) (s32)__le32_to_cpu((s32)(x)) |
| 167 | #define sle64_to_cpu(x) (s64)__le64_to_cpu((s64)(x)) |
| 168 | |
| 169 | #define sle16_to_cpup(x) (s16)__le16_to_cpu(*(s16*)(x)) |
| 170 | #define sle32_to_cpup(x) (s32)__le32_to_cpu(*(s32*)(x)) |
| 171 | #define sle64_to_cpup(x) (s64)__le64_to_cpu(*(s64*)(x)) |
| 172 | |
| 173 | /* Unsigned from CPU to LE conversion. */ |
| 174 | |
| 175 | #define cpu_to_le16(x) (u16)__cpu_to_le16((u16)(x)) |
| 176 | #define cpu_to_le32(x) (u32)__cpu_to_le32((u32)(x)) |
| 177 | #define cpu_to_le64(x) (u64)__cpu_to_le64((u64)(x)) |
| 178 | |
| 179 | #define cpu_to_le16p(x) (u16)__cpu_to_le16(*(u16*)(x)) |
| 180 | #define cpu_to_le32p(x) (u32)__cpu_to_le32(*(u32*)(x)) |
| 181 | #define cpu_to_le64p(x) (u64)__cpu_to_le64(*(u64*)(x)) |
| 182 | |
| 183 | /* Signed from CPU to LE conversion. */ |
| 184 | |
| 185 | #define cpu_to_sle16(x) (s16)__cpu_to_le16((s16)(x)) |
| 186 | #define cpu_to_sle32(x) (s32)__cpu_to_le32((s32)(x)) |
| 187 | #define cpu_to_sle64(x) (s64)__cpu_to_le64((s64)(x)) |
| 188 | |
| 189 | #define cpu_to_sle16p(x) (s16)__cpu_to_le16(*(s16*)(x)) |
| 190 | #define cpu_to_sle32p(x) (s32)__cpu_to_le32(*(s32*)(x)) |
| 191 | #define cpu_to_sle64p(x) (s64)__cpu_to_le64(*(s64*)(x)) |
| 192 | |
| 193 | /* Constant endianness conversion defines. */ |
| 194 | |
| 195 | #define const_le16_to_cpu(x) __constant_le16_to_cpu(x) |
| 196 | #define const_le32_to_cpu(x) __constant_le32_to_cpu(x) |
| 197 | #define const_le64_to_cpu(x) __constant_le64_to_cpu(x) |
| 198 | |
| 199 | #define const_cpu_to_le16(x) __constant_cpu_to_le16(x) |
| 200 | #define const_cpu_to_le32(x) __constant_cpu_to_le32(x) |
| 201 | #define const_cpu_to_le64(x) __constant_cpu_to_le64(x) |
| 202 | |
| 203 | #endif /* defined _NTFS_ENDIANS_H */ |
| 204 |