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  1. int get_CRC( const void * pBuf, int len )
  2. {
  3. 	//TODO: implement crc 
  4. 	unsigned int crc = 0;
  5. 	unsigned char i;
  6. 	unsigned char *ptr = (unsigned char *)pBuf;
  7. 	while( len-- ) {
  8. 		for(i = 0x80; i != 0; i = i >> 1) {
  9. 			if((crc & 0x8000) != 0) {
  10. 				crc = crc << 1;
  11. 				crc = crc ^ 0x1021;
  12. 			}
  13. 			else {
  14. 				crc = crc << 1;
  15. 			}
  16. 			if((*ptr & i) != 0) {
  17. 				crc = crc ^ 0x1021; 
  18. 			}
  19. 		}
  20. 		ptr++;
  21. 	}
  22. 	return crc;
  23. }
  24. #include <stdio.h>
  25. int main()
  26. {
  27. 	char buf[] = {0x31, 0x14, 0x15, 0x92, 0x66};
  28. 	printf("%d\n", get_CRC(buf, 5));
  29. 	return 0;
  30. }
  31.  
Success #stdin #stdout 0s 3468KB
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1905634707
https://ideone.com/NoOPGj
language:
C++14 (clang 8.0)
created:
7 years ago
visibility:
secret

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