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  1. #include <cstdio>
  2. #include <cstring>
  3. #include <cstdlib>
  4. #include <ctype.h>
  5.  
  6. namespace prism
  7. {
  8. 	typedef unsigned long long int token_t;
  9.  
  10. 	struct _ulldiv_t
  11. 	{
  12. 		unsigned long long int quot;
  13. 		unsigned long long int rem;
  14.  
  15. 		_ulldiv_t() : quot(0ull), rem(0ull) { }
  16. 	};
  17.  
  18. 	_ulldiv_t _div(unsigned long long int num, unsigned long long int divider)
  19. 	{
  20. 		_ulldiv_t result;
  21. 		result.rem = num%divider;
  22. 		result.quot = (unsigned long long int)num / divider;
  23. 		return result;
  24. 	}
  25.  
  26. 	unsigned long long int powull(unsigned long long int base, long num)
  27. 	{
  28. 		unsigned long long int result = 1;
  29. 		for (long i = 0; num > i; ++i)
  30. 			result = result * base;
  31. 		return result;
  32. 	}
  33.  
  34. 	const int g_iNumLetters = 38;
  35. 	const char g_pszLetters[g_iNumLetters] = "\00123456789abcdefghijklmnopqrstuvwxyz_";
  36.  
  37. 	void token_to_string(char* dest, const prism::token_t& token)
  38. 	{
  39. 		prism::token_t tokenCopy = token;
  40.  
  41. 		_ulldiv_t result;
  42. 		int i = 0;
  43. 		for (;tokenCopy != 0; ++i)
  44. 		{
  45. 			result = _div(tokenCopy, 38ull);
  46. 			tokenCopy = result.quot;
  47. 			dest[i] = g_pszLetters[result.rem];
  48. 		}
  49. 		dest[i] = '\0';
  50. 	}
  51.  
  52. 	int get_id_char(char cLetter)
  53. 	{
  54. 		for (int i = 0; i < g_iNumLetters; ++i)
  55. 			if (cLetter == g_pszLetters[i])
  56. 				return i;
  57. 		return 0;
  58. 	}
  59.  
  60. 	token_t string_to_token(const char* str)
  61. 	{
  62. 		token_t result = 0;
  63. 		unsigned len = strlen(str);
  64. 		for (unsigned i = 0; i < len; i++)
  65. 			result += powull(38, i) * (unsigned long long)get_id_char(tolower(str[i]));
  66. 		return result;
  67. 	}
  68. }
  69.  
  70. int main(int, char**)
  71. {
  72. 	const char * szStr = "test_szyfr";
  73. 	prism::token_t Result = prism::string_to_token(szStr);
  74. 	printf("result = %llu\n", Result);
  75.  
  76. 	char Buffer[16] = { 0 };
  77. 	prism::token_to_string(Buffer, Result);
  78. 	printf("result = %s\n", Buffer);
  79. 	return 0;
  80. }
Success #stdin #stdout 0s 3096KB
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stdin
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Standard input is empty
stdout
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result = 4360368022740806
result = test_szyfr
https://ideone.com/gpZrQc
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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