cst_endian.h 4.1 KB

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  1. /*************************************************************************/
  2. /* */
  3. /* Language Technologies Institute */
  4. /* Carnegie Mellon University */
  5. /* Copyright (c) 1999 */
  6. /* All Rights Reserved. */
  7. /* */
  8. /* Permission is hereby granted, free of charge, to use and distribute */
  9. /* this software and its documentation without restriction, including */
  10. /* without limitation the rights to use, copy, modify, merge, publish, */
  11. /* distribute, sublicense, and/or sell copies of this work, and to */
  12. /* permit persons to whom this work is furnished to do so, subject to */
  13. /* the following conditions: */
  14. /* 1. The code must retain the above copyright notice, this list of */
  15. /* conditions and the following disclaimer. */
  16. /* 2. Any modifications must be clearly marked as such. */
  17. /* 3. Original authors' names are not deleted. */
  18. /* 4. The authors' names are not used to endorse or promote products */
  19. /* derived from this software without specific prior written */
  20. /* permission. */
  21. /* */
  22. /* CARNEGIE MELLON UNIVERSITY AND THE CONTRIBUTORS TO THIS WORK */
  23. /* DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING */
  24. /* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT */
  25. /* SHALL CARNEGIE MELLON UNIVERSITY NOR THE CONTRIBUTORS BE LIABLE */
  26. /* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES */
  27. /* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN */
  28. /* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, */
  29. /* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF */
  30. /* THIS SOFTWARE. */
  31. /* */
  32. /*************************************************************************/
  33. /* Author: Alan W Black (awb@cs.cmu.edu) */
  34. /* Date: August 2000 */
  35. /*************************************************************************/
  36. /* */
  37. /* endianness */
  38. /* */
  39. /*************************************************************************/
  40. #ifndef __CST_ENDIAN_H__
  41. #define __CST_ENDIAN_H__
  42. /* This gets set to 1 and we test where the on bit is to determine byteorder */
  43. extern const int cst_endian_loc;
  44. /* Sun, HP, SGI Mips, M68000, PowerPC */
  45. #define CST_BIG_ENDIAN (((char *)&cst_endian_loc)[0] == 0)
  46. /* Intel, Alpha, DEC Mips, Vax, ARM, Other MIPS (Casio, Ben Nanonote etc) */
  47. #define CST_LITTLE_ENDIAN (((char *)&cst_endian_loc)[0] != 0)
  48. /* Perq (from Three Rivers) has a third byte order -- but we have no support */
  49. /* EST byte order strings */
  50. #define BYTE_ORDER_BIG "10"
  51. #define BYTE_ORDER_LITTLE "01"
  52. #define SWAPINT(x) ((((unsigned int)x) & 0xff) << 24 | \
  53. (((unsigned int)x) & 0xff00) << 8 | \
  54. (((unsigned int)x) & 0xff0000) >> 8 | \
  55. (((unsigned int)x) & 0xff000000) >> 24)
  56. /* For m68k we want to be a little more explicit */
  57. #define SWAPLONG(x) ((((unsigned long)x) & 0xff) << 24 | \
  58. (((unsigned long)x) & 0xff00) << 8 | \
  59. (((unsigned long)x) & 0xff0000) >> 8 | \
  60. (((unsigned long)x) & 0xff000000) >> 24)
  61. #define SWAPSHORT(x) ((((unsigned short)x) & 0xff) << 8 | \
  62. (((unsigned short)x) & 0xff00) >> 8)
  63. void swap_bytes_short(short * b,int n);
  64. void swapdouble(double *d);
  65. void swapfloat(float *f);
  66. #endif