src/add-ons/kernel/file_systems/bfs/bfs_endian.h

   1 /*
   2  * Copyright 2003-2008, Axel Dörfler, axeld@pinc-software.de.
   3  * Distributed under the terms of the MIT License.
   4  */
   5 #ifndef BFS_ENDIAN_H
   6 #define BFS_ENDIAN_H
   7
   8
   9 #include "system_dependencies.h"
  10
  11
  12 #if !defined(BFS_LITTLE_ENDIAN_ONLY) && !defined(BFS_BIG_ENDIAN_ONLY)
  13 //      default setting; BFS is now primarily a little endian file system
  14 #       define BFS_LITTLE_ENDIAN_ONLY
  15 #endif
  16
  17
  18 #if defined(BFS_LITTLE_ENDIAN_ONLY) && B_HOST_IS_LENDIAN \
  19         || defined(BFS_BIG_ENDIAN_ONLY) && B_HOST_IS_BENDIAN
  20                 /* host is BFS endian */
  21 #       define BFS_NATIVE_ENDIAN
  22 #       define BFS_ENDIAN_TO_HOST_INT16(value) value
  23 #       define BFS_ENDIAN_TO_HOST_INT32(value) value
  24 #       define BFS_ENDIAN_TO_HOST_INT64(value) value
  25 #       define HOST_ENDIAN_TO_BFS_INT16(value) value
  26 #       define HOST_ENDIAN_TO_BFS_INT32(value) value
  27 #       define HOST_ENDIAN_TO_BFS_INT64(value) value
  28 #elif defined(BFS_LITTLE_ENDIAN_ONLY) && B_HOST_IS_BENDIAN \
  29         || defined(BFS_BIG_ENDIAN_ONLY) && B_HOST_IS_LENDIAN
  30                 /* host is big endian, BFS is little endian or vice versa */
  31 #       define BFS_ENDIAN_TO_HOST_INT16(value) __swap_int16(value)
  32 #       define BFS_ENDIAN_TO_HOST_INT32(value) __swap_int32(value)
  33 #       define BFS_ENDIAN_TO_HOST_INT64(value) __swap_int64(value)
  34 #       define HOST_ENDIAN_TO_BFS_INT16(value) __swap_int16(value)
  35 #       define HOST_ENDIAN_TO_BFS_INT32(value) __swap_int32(value)
  36 #       define HOST_ENDIAN_TO_BFS_INT64(value) __swap_int64(value)
  37 #else
  38         // TODO: maybe build a version that supports both, big & little endian?
  39         //              But since that will need some kind of global data (to
  40         //              know of what type this file system is), it's probably
  41         //              something for the boot loader; anything else would be
  42         //              a major pain.
  43 #endif
  44
  45 #endif  /* BFS_ENDIAN_H */