externals/figlet/crc.h

   1 /*
   2  * crc.h - CRC calculation routine
   3  *
   4  * Version 1.0.1
   5  */
   6
   7 /*
   8  * Copyright (C) 1995, Edward B. Hamrick
   9  *
  10  * Permission to use, copy, modify, and distribute this software and
  11  * its documentation for any purpose and without fee is hereby granted,
  12  * provided that the above copyright notice appear in all copies and
  13  * that both that copyright notice and this permission notice appear in
  14  * supporting documentation, and that the name of the copyright holders
  15  * not be used in advertising or publicity pertaining to distribution of
  16  * the software without specific, written prior permission. The copyright
  17  * holders makes no representations about the suitability of this software
  18  * for any purpose. It is provided "as is" without express or implied warranty.
  19  *
  20  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
  21  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
  22  * IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT
  23  * OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
  24  * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  25  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  26  * OF THIS SOFTWARE.
  27  */
  28
  29 /*
  30  * Changes from 1.0 to 1.0.1:
  31  * Relicensed under the MIT license, with consent of the copyright holders.
  32  * Claudio Matsuoka (Jan 11 2011)
  33  */
  34
  35 /*
  36  * This CRC algorithm is the same as that used in zip.  Normally it
  37  * should be initialized with 0xffffffff, and the final CRC stored
  38  * should be crc ^ 0xffffffff.
  39  *
  40  * It implements the polynomial:
  41  *
  42  * x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x+1
  43  */
  44
  45 #ifndef __CRC_H
  46 #define __CRC_H
  47
  48 #ifdef __cplusplus
  49 extern "C" {
  50 #endif
  51
  52 unsigned long CrcUpdate(          /* returns updated crc         */
  53   unsigned long crc,              /* starting crc                */
  54   unsigned char *buffer,          /* buffer to use to update crc */
  55   long length                     /* length of buffer            */
  56 );
  57
  58 #ifdef __cplusplus
  59 }
  60 #endif
  61
  62 #endif