endian24.h 1.5 KB

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  1. /*
  2. * Copyright (C) International Business Machines Corp., 2001
  3. *
  4. * This program is free software; you can redistribute it and/or modify
  5. * it under the terms of the GNU General Public License as published by
  6. * the Free Software Foundation; either version 2 of the License, or
  7. * (at your option) any later version.
  8. *
  9. * This program is distributed in the hope that it will be useful,
  10. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
  12. * the GNU General Public License for more details.
  13. *
  14. * You should have received a copy of the GNU General Public License
  15. * along with this program; if not, write to the Free Software
  16. * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17. */
  18. #ifndef _H_ENDIAN24
  19. #define _H_ENDIAN24
  20. /*
  21. * endian24.h:
  22. *
  23. * Endian conversion for 24-byte data
  24. *
  25. */
  26. #define __swab24(x) \
  27. ({ \
  28. __u32 __x = (x); \
  29. ((__u32)( \
  30. ((__x & (__u32)0x000000ffUL) << 16) | \
  31. (__x & (__u32)0x0000ff00UL) | \
  32. ((__x & (__u32)0x00ff0000UL) >> 16) )); \
  33. })
  34. #if (defined(__KERNEL__) && defined(__LITTLE_ENDIAN)) || (defined(__BYTE_ORDER) && (__BYTE_ORDER == __LITTLE_ENDIAN))
  35. #define __cpu_to_le24(x) ((__u32)(x))
  36. #define __le24_to_cpu(x) ((__u32)(x))
  37. #else
  38. #define __cpu_to_le24(x) __swab24(x)
  39. #define __le24_to_cpu(x) __swab24(x)
  40. #endif
  41. #ifdef __KERNEL__
  42. #define cpu_to_le24 __cpu_to_le24
  43. #define le24_to_cpu __le24_to_cpu
  44. #endif
  45. #endif /* !_H_ENDIAN24 */