FrontendCommon: Add HTTPDownloader class

src/frontend-common/http_downloader_winhttp.h

@@ -0,0 +1,39 @@
+#pragma once
+#include "http_downloader.h"
+
+#include "common/windows_headers.h"
+
+#include <winhttp.h>
+
+namespace FrontendCommon {
+
+class HTTPDownloaderWinHttp final : public HTTPDownloader
+{
+public:
+  HTTPDownloaderWinHttp();
+  ~HTTPDownloaderWinHttp() override;
+
+  bool Initialize();
+
+protected:
+  Request* InternalCreateRequest() override;
+  void InternalPollRequests() override;
+  bool StartRequest(HTTPDownloader::Request* request) override;
+  void CloseRequest(HTTPDownloader::Request* request) override;
+
+private:
+  struct Request : HTTPDownloader::Request
+  {
+    std::wstring object_name;
+    HINTERNET hConnection = NULL;
+    HINTERNET hRequest = NULL;
+    u32 io_position = 0;
+  };
+
+  static void CALLBACK HTTPStatusCallback(HINTERNET hInternet, DWORD_PTR dwContext, DWORD dwInternetStatus,
+                                          LPVOID lpvStatusInformation, DWORD dwStatusInformationLength);
+
+  HINTERNET m_hSession = NULL;
+};
+
+} // namespace FrontendCommon