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  1. // Base64EnDe.cpp : アプリケーションのエントリ ポイントを定義します。
  2. //
  3. #include <iostream>
  4. #include <string>
  5. #include <vector>
  6. #include <cstdint>
  7. #include <tuple>
  8.  
  9.  
  10. typedef std::vector<std::uint8_t> DType;
  11. const std::string Token = "ABCDEFGHIJKLNMOPQRSTUVWXYZabcdefghijklnmopqrstuvwxyz0123456789+/";
  12. const std::string Pad = "=";
  13.  
  14.  
  15.  
  16. std::string Base64Enc(const std::string& s) {
  17. 	std::uint64_t V1 = 0;
  18. 	std::uint64_t V2 = 0;
  19. 	std::uint64_t P = 0;
  20. 	DType D;
  21. 	std::string R;
  22.  
  23.  
  24. 	for (std::size_t i = 0; i < s.size(); i++) {
  25.  
  26. 		V1 = s[i];
  27. 		i++;
  28.  
  29.  
  30. 		P = (V1 >> 2) & 0x3f;
  31. 		D.push_back(P);
  32. 		V1 &= 3;
  33.  
  34. 		V2 = s[i];
  35. 		i++;
  36.  
  37. 		P = ((V1 << 4) & 0x3f) | ((V2 >> 4) & 0x3f);
  38. 		D.push_back(P);
  39. 		V1 = V2 - ((V2 >> 4) << 4);
  40.  
  41. 		V2 = s[i];
  42. 		i++;
  43.  
  44. 		P = ((V1 << 2) & 0x3f) | ((V2 >> 6) & 0x3f);
  45. 		D.push_back(P);
  46. 		V1 = V2 - ((V2 >> 6) << 6);
  47.  
  48. 		P = V1 & 0x3f;
  49. 		D.push_back(P);
  50. 	}
  51.  
  52. 	for (auto& o : D) {
  53. 		R += Token[o];
  54. 	}
  55. 	for (std::size_t i = 0; i < 4 - (R.size() % 4); i++) {
  56. 		R += Pad;
  57. 	}
  58.  
  59. 	return R;
  60. }
  61.  
  62.  
  63. int main()
  64. {
  65. 	std::string S;
  66.  
  67. 	S = Base64Enc("ABCDEFG");
  68. 	std::cout << S << std::endl;
  69.     return 0;
  70. }
  71.  
Success #stdin #stdout 0s 4544KB
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QUJDRUZH==
https://ideone.com/bXrP3L
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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