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  1. #include <iostream>
  2.  
  3. std::string hex2bin(const std::string& hex) {
  4.     std::string bin;
  5.     for (unsigned int i = 0; i < hex.length(); i+=2) {
  6.         std::string byteString = hex.substr(i, 2);
  7.         char byte = static_cast<char>(stoi(byteString, nullptr, 16));
  8.         bin += byte;
  9.     }
  10.     return bin;
  11. }
  12.  
  13. char HexToByte(char c) {
  14.   if (c - '0' < 10) {
  15.     return c - '0';
  16.   } else {
  17.     return c - 'a' + 10;
  18.   }
  19. }
  20.  
  21. std::string HexStringToBinary(const std::string& hex) {
  22.   std::string ret;
  23.   ret.reserve((hex.size() + 1) / 2);
  24.  
  25.   size_t i = 0;
  26.   if (hex.size() % 2) {
  27.     ret += HexToByte(hex[i++]);
  28.   }
  29.  
  30.   while (i < hex.size()) {
  31.     char c = HexToByte(hex[i++]);
  32.     c <<= 4;
  33.     c |= HexToByte(hex[i++]);
  34.     ret += c;
  35.   }
  36.  
  37.   return ret;
  38. }
  39.  
  40. int main() {
  41.     std::string result = "e99a18c428cb38d5f260853678922e03";
  42.     std::string binaryStr = hex2bin(result);
  43.     std::cout << binaryStr << std::endl;
  44.     std::string res = "\xE9\x9A\x18\xC4\x28\xCB\x38\xD5\xF2\x60\x85\x36\x78\x92\x2E\x03";
  45.     std::cout << res << std::endl;
  46.  
  47.     std::string k = HexStringToBinary(result);
  48.     std::cout << k << std::endl;
  49.  
  50.     return 0;
  51. }
Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin 
Standard input is empty
stdout 
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https://ideone.com/NlgHCA
language:
C++14 (gcc 8.3)
created:
17 days ago
visibility:
public

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