1 /*
   2     libparted - a library for manipulating disk partitions
   3     Copyright (C) 1998-2002, 2007 Free Software Foundation, Inc.
   4 
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 3 of the License, or
   8     (at your option) any later version.
   9 
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14 
  15     You should have received a copy of the GNU General Public License
  16     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18 
  19 /* should only be #included by files in libparted */
  20 
  21 #ifndef PED_ENDIAN_H_INCLUDED
  22 #define PED_ENDIAN_H_INCLUDED
  23 
  24 #include <stdint.h>
  25 
  26 /* returns the n'th least significant byte */
  27 #define _GET_BYTE(x, n)         ( ((x) >> (8 * (n))) & 0xff )
  28 
  29 #define _PED_SWAP16(x)          ( (_GET_BYTE(x, 0) << 8)  \
  30                                 + (_GET_BYTE(x, 1) << 0) )
  31 
  32 #define _PED_SWAP32(x)          ( (_GET_BYTE(x, 0) << 24) \
  33                                 + (_GET_BYTE(x, 1) << 16) \
  34                                 + (_GET_BYTE(x, 2) << 8)  \
  35                                 + (_GET_BYTE(x, 3) << 0) )
  36 
  37 #define _PED_SWAP64(x)          ( (_GET_BYTE(x, 0) << 56) \
  38                                 + (_GET_BYTE(x, 1) << 48) \
  39                                 + (_GET_BYTE(x, 2) << 40) \
  40                                 + (_GET_BYTE(x, 3) << 32) \
  41                                 + (_GET_BYTE(x, 4) << 24) \
  42                                 + (_GET_BYTE(x, 5) << 16) \
  43                                 + (_GET_BYTE(x, 6) << 8)  \
  44                                 + (_GET_BYTE(x, 7) << 0) )
  45 
  46 #define PED_SWAP16(x)           ((uint16_t) _PED_SWAP16( (uint16_t) (x) ))
  47 #define PED_SWAP32(x)           ((uint32_t) _PED_SWAP32( (uint32_t) (x) ))
  48 #define PED_SWAP64(x)           ((uint64_t) _PED_SWAP64( (uint64_t) (x) ))
  49 
  50 #ifdef WORDS_BIGENDIAN
  51 
  52 #define PED_CPU_TO_LE16(x)      PED_SWAP16(x)
  53 #define PED_CPU_TO_BE16(x)      (x)
  54 #define PED_CPU_TO_LE32(x)      PED_SWAP32(x)
  55 #define PED_CPU_TO_BE32(x)      (x)
  56 #define PED_CPU_TO_LE64(x)      PED_SWAP64(x)
  57 #define PED_CPU_TO_BE64(x)      (x)
  58 
  59 #define PED_LE16_TO_CPU(x)      PED_SWAP16(x)
  60 #define PED_BE16_TO_CPU(x)      (x)
  61 #define PED_LE32_TO_CPU(x)      PED_SWAP32(x)
  62 #define PED_BE32_TO_CPU(x)      (x)
  63 #define PED_LE64_TO_CPU(x)      PED_SWAP64(x)
  64 #define PED_BE64_TO_CPU(x)      (x)
  65 
  66 #else /* !WORDS_BIGENDIAN */
  67 
  68 #define PED_CPU_TO_LE16(x)      (x)
  69 #define PED_CPU_TO_BE16(x)      PED_SWAP16(x)
  70 #define PED_CPU_TO_LE32(x)      (x)
  71 #define PED_CPU_TO_BE32(x)      PED_SWAP32(x)
  72 #define PED_CPU_TO_LE64(x)      (x)
  73 #define PED_CPU_TO_BE64(x)      PED_SWAP64(x)
  74 
  75 #define PED_LE16_TO_CPU(x)      (x)
  76 #define PED_BE16_TO_CPU(x)      PED_SWAP16(x)
  77 #define PED_LE32_TO_CPU(x)      (x)
  78 #define PED_BE32_TO_CPU(x)      PED_SWAP32(x)
  79 #define PED_LE64_TO_CPU(x)      (x)
  80 #define PED_BE64_TO_CPU(x)      PED_SWAP64(x)
  81 
  82 #endif /* !WORDS_BIGENDIAN */
  83 
  84 #endif /* PED_ENDIAN_H_INCLUDED */
  85