Line data    Source code

       1              : #ifndef THINGER_UTIL_ASCII_HPP
       2              : #define THINGER_UTIL_ASCII_HPP
       3              : 
       4              : #include <string>
       5              : #include <string_view>
       6              : 
       7              : // ASCII case folding, for protocol elements (header names, tokens, host names). Unlike
       8              : // boost::iequals or boost::to_lower, it does not depend on the global locale, and does not
       9              : // copy it on each call (its reference count is shared by every thread).
      10              : namespace thinger::util::ascii {
      11              : 
      12     29876478 :     constexpr char to_lower(char c) {
      13     29876478 :         return c >= 'A' && c <= 'Z' ? static_cast<char>(c - 'A' + 'a') : c;
      14              :     }
      15              : 
      16      5111524 :     constexpr bool iequals(std::string_view a, std::string_view b) {
      17      5111524 :         if (a.size() != b.size()) return false;
      18     12604074 :         for (size_t i = 0; i < a.size(); ++i) {
      19     11582923 :             if (to_lower(a[i]) != to_lower(b[i])) return false;
      20              :         }
      21      1021151 :         return true;
      22              :     }
      23              : 
      24         2767 :     constexpr bool istarts_with(std::string_view value, std::string_view prefix) {
      25         2767 :         return value.size() >= prefix.size() && iequals(value.substr(0, prefix.size()), prefix);
      26              :     }
      27              : 
      28       742174 :     inline void to_lower(std::string& value) {
      29      6944231 :         for (auto& c : value) c = to_lower(c);
      30       742174 :     }
      31              : 
      32              : }
      33              : 
      34              : #endif