[datalogtool] Add datalogtool

This is a support tool for datalog file conversion (and eventually
download/remote datalog file management).

datalogtool/src/main/native/cpp/Downloader.h

@@ -0,0 +1,78 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <memory>
+#include <string>
+#include <thread>
+#include <vector>
+
+#include <wpi/condition_variable.h>
+#include <wpi/mutex.h>
+
+namespace glass {
+class Storage;
+}  // namespace glass
+
+namespace pfd {
+class select_folder;
+}  // namespace pfd
+
+class Downloader {
+ public:
+  explicit Downloader(glass::Storage& storage);
+  ~Downloader();
+
+  void Display();
+
+ private:
+  void DisplayConnect();
+  void DisplayDisconnectButton();
+  void DisplayRemoteDirSelector();
+  void DisplayLocalDirSelector();
+  size_t DisplayFiles();
+
+  void ThreadMain();
+
+  wpi::mutex m_mutex;
+  enum State {
+    kDisconnected,
+    kConnecting,
+    kConnected,
+    kDisconnecting,
+    kGetFiles,
+    kDownload,
+    kDownloadDone,
+    kExit
+  } m_state = kDisconnected;
+  std::condition_variable m_cv;
+
+  std::string& m_serverTeam;
+  std::string& m_remoteDir;
+  std::string& m_username;
+  std::string m_password;
+
+  std::string& m_localDir;
+  std::unique_ptr<pfd::select_folder> m_localDirSelector;
+
+  bool& m_deleteAfter;
+
+  std::vector<std::string> m_dirList;
+  struct DownloadState {
+    DownloadState(std::string_view name, uint64_t size)
+        : name{name}, size{size} {}
+
+    std::string name;
+    uint64_t size;
+    bool enabled = true;
+    float complete = 0.0;
+    std::string status;
+  };
+  std::vector<DownloadState> m_downloadList;
+
+  std::string m_error;
+
+  std::thread m_thread;
+};