crc.h 3.2 KB

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  1. /*
  2. *==========================================================================
  3. *
  4. * crc.h
  5. *
  6. * Interface for the CRC algorithms.
  7. *
  8. *==========================================================================
  9. *####ECOSGPLCOPYRIGHTBEGIN####
  10. * -------------------------------------------
  11. * This file is part of eCos, the Embedded Configurable Operating System.
  12. * Copyright (C) 2002 Andrew Lunn
  13. *
  14. * eCos is free software; you can redistribute it and/or modify it under
  15. * the terms of the GNU General Public License as published by the Free
  16. * Software Foundation; either version 2 or (at your option) any later version.
  17. *
  18. * eCos is distributed in the hope that it will be useful, but WITHOUT ANY
  19. * WARRANTY; without even the implied warranty of MERCHANTABILITY or
  20. * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  21. * for more details.
  22. *
  23. * You should have received a copy of the GNU General Public License along
  24. * with eCos; if not, write to the Free Software Foundation, Inc.,
  25. * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  26. *
  27. * As a special exception, if other files instantiate templates or use macros
  28. * or inline functions from this file, or you compile this file and link it
  29. * with other works to produce a work based on this file, this file does not
  30. * by itself cause the resulting work to be covered by the GNU General Public
  31. * License. However the source code for this file must still be made available
  32. * in accordance with section (3) of the GNU General Public License.
  33. *
  34. * This exception does not invalidate any other reasons why a work based on
  35. * this file might be covered by the GNU General Public License.
  36. *
  37. * Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
  38. * at http: *sources.redhat.com/ecos/ecos-license/
  39. * -------------------------------------------
  40. *####ECOSGPLCOPYRIGHTEND####
  41. *==========================================================================
  42. *#####DESCRIPTIONBEGIN####
  43. *
  44. * Author(s): Andrew Lunn
  45. * Contributors: Andrew Lunn
  46. * Date: 2002-08-06
  47. * Purpose:
  48. * Description:
  49. *
  50. * This code is part of eCos (tm).
  51. *
  52. *####DESCRIPTIONEND####
  53. *
  54. *==========================================================================
  55. */
  56. #ifndef _SERVICES_CRC_CRC_H_
  57. #define _SERVICES_CRC_CRC_H_
  58. #include <linux/types.h>
  59. #ifndef __externC
  60. # ifdef __cplusplus
  61. # define __externC extern "C"
  62. # else
  63. # define __externC extern
  64. # endif
  65. #endif
  66. /* Compute a CRC, using the POSIX 1003 definition */
  67. extern uint32_t
  68. cyg_posix_crc32(unsigned char *s, int len);
  69. /* Gary S. Brown's 32 bit CRC */
  70. extern uint32_t
  71. cyg_crc32(unsigned char *s, int len);
  72. /* Gary S. Brown's 32 bit CRC, but accumulate the result from a */
  73. /* previous CRC calculation */
  74. extern uint32_t
  75. cyg_crc32_accumulate(uint32_t crc, unsigned char *s, int len);
  76. /* Ethernet FCS Algorithm */
  77. extern uint32_t
  78. cyg_ether_crc32(unsigned char *s, int len);
  79. /* Ethernet FCS algorithm, but accumulate the result from a previous */
  80. /* CRC calculation. */
  81. extern uint32_t
  82. cyg_ether_crc32_accumulate(uint32_t crc, unsigned char *s, int len);
  83. /* 16 bit CRC with polynomial x^16+x^12+x^5+1 */
  84. extern uint16_t cyg_crc16(unsigned char *s, int len);
  85. #endif /* _SERVICES_CRC_CRC_H_ */