fs/ntfs/ntfsendian.h

   1 /*
   2  *  ntfsendian.h
   3  *
   4  *  Copyright (C) 1998 Martin von Löwis
   5  *  Copyright (C) 1998 Joseph Malicki
   6  */
   7
   8 #ifdef __linux__
   9 /* This defines __cpu_to_le16 on Linux 2.1 and higher. */
  10 #include <asm/byteorder.h>
  11 #endif
  12
  13 #ifdef __cpu_to_le16
  14 #define CPU_TO_LE16(a) __cpu_to_le16(a)
  15 #define CPU_TO_LE32(a) __cpu_to_le32(a)
  16 #define CPU_TO_LE64(a) __cpu_to_le64(a)
  17
  18 #define LE16_TO_CPU(a) __cpu_to_le16(a)
  19 #define LE32_TO_CPU(a) __cpu_to_le32(a)
  20 #define LE64_TO_CPU(a) __cpu_to_le64(a)
  21
  22 #else
  23
  24 #ifdef __LITTLE_ENDIAN
  25
  26 #define CPU_TO_LE16(a) (a)
  27 #define CPU_TO_LE32(a) (a)
  28 #define CPU_TO_LE64(a) (a)
  29 #define LE16_TO_CPU(a) (a)
  30 #define LE32_TO_CPU(a) (a)
  31 #define LE64_TO_CPU(a) (a)
  32
  33 #else
  34
  35 /* Routines for big-endian machines */
  36 #ifdef __BIG_ENDIAN
  37
  38 /* We hope its big-endian, not PDP-endian :) */
  39 #define CPU_TO_LE16(a) ((((a)&0xF) << 8)|((a) >> 8))
  40 #define CPU_TO_LE32(a) ((((a) & 0xF) << 24) | (((a) & 0xF0) << 8) | \
  41                         (((a) & 0xF00) >> 8) | ((a) >> 24))
  42 #define CPU_TO_LE64(a) ((CPU_TO_LE32(a)<<32)|CPU_TO_LE32((a)>>32)
  43
  44 #define LE16_TO_CPU(a) CPU_TO_LE16(a)
  45 #define LE32_TO_CPU(a) CPU_TO_LE32(a)
  46 #define LE64_TO_CPU(a) CPU_TO_LE64(a)
  47
  48 #else
  49
  50 #error Please define Endianness - __BIG_ENDIAN or __LITTLE_ENDIAN or add OS-specific macros
  51
  52 #endif /* __BIG_ENDIAN */
  53 #endif /* __LITTLE_ENDIAN */
  54 #endif /* __cpu_to_le16 */
  55
  56 #define NTFS_GETU8(p)      (*(ntfs_u8*)(p))
  57 #define NTFS_GETU16(p)     ((ntfs_u16)LE16_TO_CPU(*(ntfs_u16*)(p)))
  58 #define NTFS_GETU24(p)     (NTFS_GETU32(p) & 0xFFFFFF)
  59 #define NTFS_GETU32(p)     ((ntfs_u32)LE32_TO_CPU(*(ntfs_u32*)(p)))
  60 #define NTFS_GETU40(p)     ((ntfs_u64)NTFS_GETU32(p)|(((ntfs_u64)NTFS_GETU8(((char*)(p))+4))<<32))
  61 #define NTFS_GETU48(p)     ((ntfs_u64)NTFS_GETU32(p)|(((ntfs_u64)NTFS_GETU16(((char*)(p))+4))<<32))
  62 #define NTFS_GETU56(p)     ((ntfs_u64)NTFS_GETU32(p)|(((ntfs_u64)NTFS_GETU24(((char*)(p))+4))<<32))
  63 #define NTFS_GETU64(p)     ((ntfs_u64)LE64_TO_CPU(*(ntfs_u64*)(p)))
  64
  65  /* Macros writing unsigned integers */
  66 #define NTFS_PUTU8(p,v)      ((*(ntfs_u8*)(p))=(v))
  67 #define NTFS_PUTU16(p,v)     ((*(ntfs_u16*)(p))=CPU_TO_LE16(v))
  68 #define NTFS_PUTU24(p,v)     NTFS_PUTU16(p,(v) & 0xFFFF);\
  69                              NTFS_PUTU8(((char*)(p))+2,(v)>>16)
  70 #define NTFS_PUTU32(p,v)     ((*(ntfs_u32*)(p))=CPU_TO_LE32(v))
  71 #define NTFS_PUTU64(p,v)     ((*(ntfs_u64*)(p))=CPU_TO_LE64(v))
  72
  73  /* Macros reading signed integers */
  74 #define NTFS_GETS8(p)        ((*(ntfs_s8*)(p)))
  75 #define NTFS_GETS16(p)       ((ntfs_s16)LE16_TO_CPU(*(short*)(p)))
  76 #define NTFS_GETS24(p)       (NTFS_GETU24(p) < 0x800000 ? (int)NTFS_GETU24(p) : (int)(NTFS_GETU24(p) - 0x1000000))
  77 #define NTFS_GETS32(p)       ((ntfs_s32)LE32_TO_CPU(*(int*)(p)))
  78 #define NTFS_GETS40(p)       (((ntfs_s64)NTFS_GETS32(p)) | (((ntfs_s64)NTFS_GETS8(((char*)(p))+4)) << 32))
  79 #define NTFS_GETS48(p)       (((ntfs_s64)NTFS_GETS32(p)) | (((ntfs_s64)NTFS_GETS16(((char*)(p))+4)) << 32))
  80 #define NTFS_GETS56(p)       (((ntfs_s64)NTFS_GETS32(p)) | (((ntfs_s64)NTFS_GETS24(((char*)(p))+4)) << 32))
  81 #define NTFS_GETS64(p)       ((ntfs_s64)NTFS_GETU64(p))
  82
  83 #define NTFS_PUTS8(p,v)      NTFS_PUTU8(p,v)
  84 #define NTFS_PUTS16(p,v)     NTFS_PUTU16(p,v)
  85 #define NTFS_PUTS24(p,v)     NTFS_PUTU24(p,v)
  86 #define NTFS_PUTS32(p,v)     NTFS_PUTU32(p,v)