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include/drives/remote/remote_open_file_table.hpp

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+/*
+  Copyright <2018-2022> <scott.e.graves@protonmail.com>
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
+  associated documentation files (the "Software"), to deal in the Software without restriction,
+  including without limitation the rights to use, copy, modify, merge, publish, distribute,
+  sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all copies or
+  substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
+  NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+  DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
+  OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+#ifndef INCLUDE_DRIVES_REMOTE_REMOTE_OPEN_FILE_TABLE_HPP_
+#define INCLUDE_DRIVES_REMOTE_REMOTE_OPEN_FILE_TABLE_HPP_
+
+#include "common.hpp"
+#include "types/remote.hpp"
+#include "types/repertory.hpp"
+
+namespace repertory {
+class remote_open_file_table {
+protected:
+  remote_open_file_table() = default;
+
+  virtual ~remote_open_file_table() = default;
+
+protected:
+  struct compat_open_info {
+    std::size_t count = 0u;
+    std::string client_id = "";
+  };
+
+  struct open_info {
+    std::size_t count = 0u;
+    std::string client_id = "";
+    PVOID directory_buffer = nullptr;
+    std::string path;
+  };
+
+private:
+  std::unordered_map<remote::file_handle, compat_open_info> compat_lookup_;
+  std::mutex compat_mutex_;
+  std::unordered_map<std::string, std::vector<void *>> directory_lookup_;
+  std::mutex directory_mutex_;
+  std::unordered_map<OSHandle, open_info> file_lookup_;
+  std::mutex file_mutex_;
+
+protected:
+  void add_directory(const std::string &client_id, void *dir);
+
+  void close_all(const std::string &client_id);
+
+  virtual void delete_open_directory(void *dir) = 0;
+
+#ifdef _WIN32
+  bool get_directory_buffer(const OSHandle &handle, PVOID *&buffer);
+#endif
+
+  bool get_open_info(const OSHandle &handle, open_info &oi);
+
+  std::string get_open_file_path(const OSHandle &handle);
+
+  bool has_open_directory(const std::string &client_id, void *dir);
+
+  int has_compat_open_info(const remote::file_handle &handle, const int &error_return);
+
+  template <typename error_type>
+  error_type has_open_info(const OSHandle &handle, const error_type &error_return) {
+    mutex_lock file_lock(file_mutex_);
+    return ((file_lookup_.find(handle) == file_lookup_.end()) ? error_return : 0);
+  }
+
+  void remove_compat_open_info(const remote::file_handle &handle);
+
+  bool remove_directory(const std::string &client_id, void *dir);
+
+  void remove_open_info(const OSHandle &handle);
+
+  void set_client_id(const OSHandle &handle, const std::string &client_id);
+
+  void set_compat_client_id(const remote::file_handle &handle, const std::string &client_id);
+
+  void set_compat_open_info(const remote::file_handle &handle);
+
+  void set_open_info(const OSHandle &handle, open_info oi);
+};
+} // namespace repertory
+
+#endif // INCLUDE_DRIVES_REMOTE_REMOTE_OPEN_FILE_TABLE_HPP_