add

+/**************************************************************************
+* file:              dmpserverutils.cpp
+
+* Author:            wanzhongping
+* Date:              2021-03-17 16:05:37
+* Email:             zhongpingw@chinadci.com
+* copyright:         广州城市信息研究所有限公司
+***************************************************************************/
+
+#include "dmpserverutils.h"
+
+  int DmpServerUtils::GetLibraryPaths(const boost::filesystem::path &dir, std::vector<boost::filesystem::path> &locations)
+  {
+    if (!boost::filesystem::exists(dir))
+    {
+      return -1;
+    }
+
+    std::string dllExt(".dll");
+#ifdef IS_WINDOWS
+    dllExt = ".dll";
+#elif IS_LINUX
+    dllExt = ".so";
+#else
+    dllExt = ".dll";
+#endif
+
+    boost::filesystem::directory_iterator end_iter;
+    for (boost::filesystem::directory_iterator iter(dir); iter != end_iter; ++iter)
+    {
+      if (boost::filesystem::is_regular_file(iter->status()) && iter->path().extension() == dllExt)
+      {
+        locations.push_back(iter->path());
+      }
+
+      if (boost::filesystem::is_directory(iter->status()))
+      {
+        GetLibraryPaths(iter->path(), locations);
+      }
+    }
+
+    return locations.size();
+  }
+
+  std::string Percent::encode(const std::string &value) noexcept {
+    static auto hex_chars = "0123456789ABCDEF";
+
+    std::string result;
+    result.reserve(value.size()); // Minimum size of result
+
+    for(auto &chr : value) {
+      if(!((chr >= '0' && chr <= '9') || (chr >= 'A' && chr <= 'Z') || (chr >= 'a' && chr <= 'z') || chr == '-' || chr == '.' || chr == '_' || chr == '~'))
+        result += std::string("%") + hex_chars[static_cast<unsigned char>(chr) >> 4] + hex_chars[static_cast<unsigned char>(chr) & 15];
+      else
+        result += chr;
+    }
+
+    return result;
+  }
+
+  // Returns percent-decoded string
+  std::string Percent::decode(const std::string &value) noexcept {
+    std::string result;
+    result.reserve(value.size() / 3 + (value.size() % 3)); // Minimum size of result
+
+    for(std::size_t i = 0; i < value.size(); ++i) {
+      auto &chr = value[i];
+      if(chr == '%' && i + 2 < value.size()) {
+        auto hex = value.substr(i + 1, 2);
+        auto decoded_chr = static_cast<char>(std::strtol(hex.c_str(), nullptr, 16));
+        result += decoded_chr;
+        i += 2;
+      }
+      else if(chr == '+')
+        result += ' ';
+      else
+        result += chr;
+    }
+    return result;
+  }
+
+
+  // Returns query string created from given field names and values
+  std::string QueryString::create(const CIMap &fields) noexcept {
+    std::string result;
+
+    bool first = true;
+    for(auto &field : fields) {
+      result += (!first ? "&" : "") + field.first + '=' + Percent::encode(field.second);
+      first = false;
+    }
+    
+    return result;
+  }
+
+  // Returns query keys with percent-decoded values.
+  CIMap QueryString::parse(const std::string &query_string) noexcept {
+    CIMap result;
+
+    if(query_string.empty())
+      return result;
+
+    std::size_t name_pos = 0;
+    auto name_end_pos = std::string::npos;
+    auto value_pos = std::string::npos;
+    for(std::size_t c = 0; c < query_string.size(); ++c) {
+      if(query_string[c] == '&') {
+        auto name = query_string.substr(name_pos, (name_end_pos == std::string::npos ? c : name_end_pos) - name_pos);
+        if(!name.empty()) {
+          auto value = value_pos == std::string::npos ? std::string() : query_string.substr(value_pos, c - value_pos);
+          result.emplace(std::move(name), Percent::decode(value));
+        }
+        name_pos = c + 1;
+        name_end_pos = std::string::npos;
+        value_pos = std::string::npos;
+      }
+      else if(query_string[c] == '=' && name_end_pos == std::string::npos) {
+        name_end_pos = c;
+        value_pos = c + 1;
+      }
+    }
+    if(name_pos < query_string.size()) {
+      auto name = query_string.substr(name_pos, (name_end_pos == std::string::npos ? std::string::npos : name_end_pos - name_pos));
+      if(!name.empty()) {
+        auto value = value_pos >= query_string.size() ? std::string() : query_string.substr(value_pos);
+        result.emplace(std::move(name), Percent::decode(value));
+      }
+    }
+    return result;
+  }