[skip-ci] initial support for stream installs, add ftp installs.

do NOT build or release binaries of this version, it is not complete and there will be dragons.

sphaira/include/ui/menus/ftp_menu.hpp

@@ -0,0 +1,54 @@
+#pragma once
+
+#include "ui/menus/menu_base.hpp"
+#include "yati/source/stream.hpp"
+
+namespace sphaira::ui::menu::ftp {
+
+enum class State {
+    // not connected.
+    None,
+    // just connected, starts the transfer.
+    Connected,
+    // set whilst transfer is in progress.
+    Progress,
+    // set when the transfer is finished.
+    Done,
+    // failed to connect.
+    Failed,
+};
+
+struct StreamFtp final : yati::source::Stream {
+    StreamFtp(const fs::FsPath& path, std::stop_token token);
+
+    Result ReadChunk(void* buf, s64 size, u64* bytes_read) override;
+    bool Push(const void* buf, s64 size);
+    void Disable();
+
+// private:
+    fs::FsPath m_path{};
+    std::stop_token m_token{};
+    std::vector<u8> m_buffer{};
+    Mutex m_mutex{};
+    bool m_active{};
+    // bool m_push_exit{};
+};
+
+struct Menu final : MenuBase {
+    Menu();
+    ~Menu();
+
+    void Update(Controller* controller, TouchInfo* touch) override;
+    void Draw(NVGcontext* vg, Theme* theme) override;
+    void OnFocusGained() override;
+
+// this should be private
+// private:
+    std::shared_ptr<StreamFtp> m_source;
+    Thread m_thread{};
+    Mutex m_mutex{};
+    // the below are shared across threads, lock with the above mutex!
+    State m_state{State::None};
+};
+
+} // namespace sphaira::ui::menu::ftp