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  1. #include <stdio.h>
  2. #include <stddef.h>
  3. #include <stdint.h>
  4.  
  5. uint32_t crc32(const char *s,size_t n) {
  6. 	uint32_t crc=0xFFFFFFFF;
  7.  
  8. 	for(size_t i=0;i<n;i++) {
  9. 		char ch=s[i];
  10. 		for(size_t j=0;j<8;j++) {
  11. 			uint32_t b=(ch^crc)&1;
  12. 			crc>>=1;
  13. 			if(b) crc=crc^0x04C11DB7;
  14. 			ch>>=1;
  15. 		}
  16. 	}
  17.  
  18. 	return ~crc;
  19. }
  20.  
  21. int main()
  22. {
  23.     char* a = "Hello World";
  24.     int crc = crc32(a, 11);
  25.     printf("Hello World %X", crc);
  26.  
  27.     return 0;
  28. }
Success #stdin #stdout 0s 5516KB
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Hello World FC6BF04E
https://ideone.com/ErTGRf
language:
C (gcc 8.3)
created:
1 year ago
visibility:
public

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