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  1. #include <string>
  2. #include <algorithm>
  3. #include <vector>
  4. #include <iostream>
  5. #include <iterator>
  6. #include <iomanip>
  7.  
  8. inline int char2hex(char c)
  9. {
  10.    if (c >= '0' && c <= '9') return c - '0';
  11.    if (c >= 'a' && c <= 'f') return c - 'a' + 10;
  12.    if (c >= 'A' && c <= 'F') return c - 'A' + 10;
  13.  
  14. }
  15. std::vector<unsigned char> str2hex(const std::string& hexStr)
  16. {
  17.      std::vector<unsigned char> retVal;
  18.      bool highPart = ((hexStr.length() % 2) == 0);  
  19.      if (!highPart)
  20.          retVal.push_back(0);
  21.      std::for_each(hexStr.begin(), hexStr.end(), 
  22.         [&](char nextChar) {
  23.            if (highPart)
  24. 		retVal.push_back(0x10 * char2hex(nextChar));
  25.            else
  26. 		retVal.back() += char2hex(nextChar);
  27.            highPart = !highPart;
  28.        }
  29.      );
  30.  
  31.     return retVal;
  32. }
  33.  
  34. int main() {
  35.   std::string someHex =  "c45a1bf";
  36.   std::vector<unsigned char> someUHex = str2hex(someHex);
  37.   std::copy(someUHex.begin(), someUHex.end(), std::ostream_iterator<int>(std::cout << std::hex, ""));
  38. }
Success #stdin #stdout 0s 3064KB
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c45a1bf
https://ideone.com/9xhU3U
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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