webusb: add support for exporting. usb: block requests with no timeout, using pbox to cancel if the user presses B.

sphaira/include/ui/progress_box.hpp

@@ -11,6 +11,7 @@ namespace sphaira::ui {
 struct ProgressBox;
 using ProgressBoxCallback = std::function<Result(ProgressBox*)>;
 using ProgressBoxDoneCallback = std::function<void(Result rc)>;
+// using CancelCallback = std::function<void()>;
 
 struct ProgressBox final : Widget {
     ProgressBox(
@@ -39,6 +40,9 @@ struct ProgressBox final : Widget {
     auto ShouldExit() -> bool;
     auto ShouldExitResult() -> Result;
 
+    void AddCancelEvent(UEvent* event);
+    void RemoveCancelEvent(const UEvent* event);
+
     // helper functions
     auto CopyFile(fs::Fs* fs_src, fs::Fs* fs_dst, const fs::FsPath& src, const fs::FsPath& dst, bool single_threaded = false) -> Result;
     auto CopyFile(fs::Fs* fs, const fs::FsPath& src, const fs::FsPath& dst, bool single_threaded = false) -> Result;
@@ -82,6 +86,7 @@ private:
     Thread m_thread{};
     ThreadData m_thread_data{};
     ProgressBoxDoneCallback m_done{};
+    std::vector<UEvent*> m_cancel_events{};
 
     // shared data start.
     std::string m_action{};

sphaira/include/usb/usb_dumper.hpp

@@ -24,6 +24,14 @@ struct Usb {
     // Result OpenFile(u32 index, s64& file_size);
     Result CloseFile();
 
+    auto GetOpenResult() const {
+        return m_open_result;
+    }
+
+    auto GetCancelEvent() {
+        return m_usb->GetCancelEvent();
+    }
+
 private:
     Result SendAndVerify(const void* data, u32 size, u64 timeout, api::ResultPacket* out = nullptr);
     Result SendAndVerify(const void* data, u32 size, api::ResultPacket* out = nullptr);

sphaira/include/usb/usb_installer.hpp

@@ -25,6 +25,14 @@ struct Usb {
     Result OpenFile(u32 index, s64& file_size);
     Result CloseFile();
 
+    auto GetOpenResult() const {
+        return m_open_result;
+    }
+
+    auto GetCancelEvent() {
+        return m_usb->GetCancelEvent();
+    }
+
 private:
     Result SendAndVerify(const void* data, u32 size, u64 timeout, api::ResultPacket* out = nullptr);
     Result SendAndVerify(const void* data, u32 size, api::ResultPacket* out = nullptr);

sphaira/include/usb/usb_uploader.hpp

@@ -29,6 +29,14 @@ struct Usb {
 
     Result file_transfer_loop();
 
+    auto GetOpenResult() const {
+        return m_open_result;
+    }
+
+    auto GetCancelEvent() {
+        return m_usb->GetCancelEvent();
+    }
+
 private:
     Result SendResult(u32 result, u32 arg3 = 0, u32 arg4 = 0);
 

sphaira/include/yati/source/usb.hpp

@@ -43,6 +43,14 @@ struct Usb final : Base {
         return m_usb->CloseFile();
     }
 
+    auto GetOpenResult() const {
+        return m_usb->GetOpenResult();
+    }
+
+    auto GetCancelEvent() {
+        return m_usb->GetCancelEvent();
+    }
+
 private:
     std::unique_ptr<usb::install::Usb> m_usb{};
 };