2 * endians.h - Definitions related to handling of byte ordering. Part of the
5 * Copyright (c) 2000-2002 Anton Altaparmakov
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.
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.
17 * You should have received a copy of the GNU General Public License
18 * along with this program (in the main directory of the Linux-NTFS
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
23 #ifndef _NTFS_ENDIANS_H
24 #define _NTFS_ENDIANS_H
29 * We define the conversion functions including typecasts since the
30 * defaults don't necessarily perform appropriate typecasts.
31 * Also, using our own functions means that we can change them if it
32 * turns out that we do need to use the unaligned access macros on
33 * architectures requirering aligned memory accesses...
36 #include <asm/byteorder.h>
38 /* Unsigned from LE to CPU conversion. */
40 #define le16_to_cpu(x) (u16)__le16_to_cpu((u16)(x))
41 #define le32_to_cpu(x) (u32)__le32_to_cpu((u32)(x))
42 #define le64_to_cpu(x) (u64)__le64_to_cpu((u64)(x))
44 #define le16_to_cpup(x) (u16)__le16_to_cpu(*(u16*)(x))
45 #define le32_to_cpup(x) (u32)__le32_to_cpu(*(u32*)(x))
46 #define le64_to_cpup(x) (u64)__le64_to_cpu(*(u64*)(x))
48 /* Signed from LE to CPU conversion. */
50 #define sle16_to_cpu(x) (s16)__le16_to_cpu((s16)(x))
51 #define sle32_to_cpu(x) (s32)__le32_to_cpu((s32)(x))
52 #define sle64_to_cpu(x) (s64)__le64_to_cpu((s64)(x))
54 #define sle16_to_cpup(x) (s16)__le16_to_cpu(*(s16*)(x))
55 #define sle32_to_cpup(x) (s32)__le32_to_cpu(*(s32*)(x))
56 #define sle64_to_cpup(x) (s64)__le64_to_cpu(*(s64*)(x))
58 /* Unsigned from CPU to LE conversion. */
60 #define cpu_to_le16(x) (u16)__cpu_to_le16((u16)(x))
61 #define cpu_to_le32(x) (u32)__cpu_to_le32((u32)(x))
62 #define cpu_to_le64(x) (u64)__cpu_to_le64((u64)(x))
64 #define cpu_to_le16p(x) (u16)__cpu_to_le16(*(u16*)(x))
65 #define cpu_to_le32p(x) (u32)__cpu_to_le32(*(u32*)(x))
66 #define cpu_to_le64p(x) (u64)__cpu_to_le64(*(u64*)(x))
68 /* Signed from CPU to LE conversion. */
70 #define scpu_to_le16(x) (s16)__cpu_to_le16((s16)(x))
71 #define scpu_to_le32(x) (s32)__cpu_to_le32((s32)(x))
72 #define scpu_to_le64(x) (s64)__cpu_to_le64((s64)(x))
74 #define scpu_to_le16p(x) (s16)__cpu_to_le16(*(s16*)(x))
75 #define scpu_to_le32p(x) (s32)__cpu_to_le32(*(s32*)(x))
76 #define scpu_to_le64p(x) (s64)__cpu_to_le64(*(s64*)(x))
79 * Constant endianness conversion defines.
81 #define const_le16_to_cpu(x) __constant_le16_to_cpu(x)
82 #define const_le32_to_cpu(x) __constant_le32_to_cpu(x)
83 #define const_le64_to_cpu(x) __constant_le64_to_cpu(x)
85 #define const_cpu_to_le16(x) __constant_cpu_to_le16(x)
86 #define const_cpu_to_le32(x) __constant_cpu_to_le32(x)
87 #define const_cpu_to_le64(x) __constant_cpu_to_le64(x)
89 #endif /* defined _NTFS_ENDIANS_H */