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  1. // CRC.cpp : Example program for computing slide label CRC.
  2. // Copyright 2003 Cytyc Corp. All rights reserved.
  3.  
  4.  
  5. #include <stdio.h>
  6.  
  7. #define SLIDE_ID_LEN 11		// Length of slide ID
  8.  
  9. // This function computes and returns the CRC associated with the slideIDString input 
  10. // argument.
  11. //  
  12. unsigned char computeCrc(char *slideIdString)
  13. {
  14. 	unsigned char Local8BitPoly = 0x025;
  15. 	unsigned char crcTable[256];
  16. 	int i,j;
  17. 	unsigned char crc = 0;
  18.  
  19. 	// Generate CRC table
  20. 	unsigned char crc_accum;
  21. 	for(i=0; i<256; i++)
  22. 	{
  23. 		crc_accum = (unsigned char) i;
  24.  
  25. 		for(j=0; j<8; j++)
  26. 		{ // If lead 1 then XOR to divide else move on.
  27. 			if(crc_accum & 0x80)
  28. 				crc_accum = (crc_accum << 1) ^ Local8BitPoly;
  29. 			else
  30. 				crc_accum = (crc_accum << 1);
  31. 		}
  32. 		crcTable[i] = crc_accum;  // Update next item in table
  33. 	}	
  34.  
  35.  
  36. 	// calculate the CRC
  37. 	for(j=0; j < SLIDE_ID_LEN; j++)
  38. 	{
  39. 	  i = ((crc) ^ slideIdString[j]) & 0xff;
  40. 	  crc = (crc << 8) ^ crcTable[i];
  41. 	}
  42.  
  43. 	return crc;
  44. }
  45.  
  46.  
  47. // This main program provides an example of how to use the computeCrc function.
  48. // In this example, the CRC's are computed and displayed for a range of 25 ID's starting 
  49. // with the ID value of "140180001".
  50. //
  51. int main(int argc, char* argv[])
  52. {
  53. 	long id = 14222300;
  54. 	long y_id = 11;
  55. 	char idstring[SLIDE_ID_LEN+1];
  56. 	int i;
  57.  
  58. 	// Generate CRC for 25 values
  59. 	for (i=0; i < 11; i++, id++)
  60. 	{
  61. 		sprintf(idstring, "%02ld%09ld", y_id, id);
  62. 		printf("%s   %03d\n", idstring, computeCrc(idstring));
  63. 	}
  64.  
  65. 	return 0;
  66. }
  67.  
  68.  
Not running #stdin #stdout 0s 0KB
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https://ideone.com/CGQRN
language:
Text (text 6.10)
created:
14 years ago
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