Merge branch 'master' (early part) into medusa

CHANGES

@@ -53,6 +53,7 @@ Other fixes:
  - VFS: Fix minizip write returning 0 on success instead of size
 Misc:
  - GB Serialize: Add missing savestate support for MBC6 and NT (newer)
+ - GBA: Improve detection of valid ELF ROMs
  - macOS: Add category to plist (closes mgba.io/i/2691)
  - macOS: Fix modern build with libepoxy (fixes mgba.io/i/2700)
  - Qt: Keep track of current pslette preset name (fixes mgba.io/i/2680)

include/mgba/internal/gba/gba.h

@@ -154,6 +154,12 @@ void GBAHalt(struct GBA* gba);
 void GBAStop(struct GBA* gba);
 void GBADebug(struct GBA* gba, uint16_t value);
 
+#ifdef USE_ELF
+struct ELF;
+
+bool GBAVerifyELFEntry(struct ELF* elf, uint32_t target);
+#endif
+
 #ifdef USE_DEBUGGERS
 struct mDebugger;
 void GBAAttachDebugger(struct GBA* gba, struct mDebugger* debugger);

src/gba/core.c

@@ -245,7 +245,7 @@ static bool _GBACoreInit(struct mCore* core) {
 #ifndef MINIMAL_CORE
 	core->inputInfo = &GBAInputInfo;
 #endif
-	
+
 	return true;
 }
 
@@ -523,7 +523,7 @@ static bool _GBACoreLoadROM(struct mCore* core, struct VFile* vf) {
 #ifdef USE_ELF
 	struct ELF* elf = ELFOpen(vf);
 	if (elf) {
-		if (ELFEntry(elf) == BASE_CART0) {
+		if (GBAVerifyELFEntry(elf, BASE_CART0)) {
 			GBALoadNull(core->board);
 		}
 		bool success = mCoreLoadELF(core, elf);

src/gba/gba.c

@@ -594,6 +594,63 @@ void GBADebug(struct GBA* gba, uint16_t flags) {
 	gba->debugFlags = GBADebugFlagsClearSend(gba->debugFlags);
 }
 
+#ifdef USE_ELF
+bool GBAVerifyELFEntry(struct ELF* elf, uint32_t target) {
+	if (ELFEntry(elf) == target) {
+		return true;
+	}
+
+	struct ELFProgramHeaders ph;
+	ELFProgramHeadersInit(&ph, 0);
+	ELFGetProgramHeaders(elf, &ph);
+	size_t i;
+	for (i = 0; i < ELFProgramHeadersSize(&ph); ++i) {
+		Elf32_Phdr* phdr = ELFProgramHeadersGetPointer(&ph, i);
+		if (!phdr->p_filesz) {
+			continue;
+		}
+
+		size_t phdrS = phdr->p_paddr;
+		size_t phdrE = phdrS + phdr->p_filesz;
+
+		// Does the segment contain our target address?
+		if (target < phdrS || target + 4 > phdrE) {
+			continue;
+		}
+
+		// File offset to what should be the rom entry instruction
+		size_t off = phdr->p_offset + target - phdrS;
+
+		size_t eSize;
+		const char* bytes = ELFBytes(elf, &eSize);
+
+		// Bounds and alignment check
+		if (off >= eSize || off & 3) {
+			continue;
+		}
+
+		uint32_t opcode;
+		LOAD_32(opcode, off, bytes);
+		struct ARMInstructionInfo info;
+		ARMDecodeARM(opcode, &info);
+
+		if (info.branchType != ARM_BRANCH && info.branchType != ARM_BRANCH_LINKED) {
+			continue;
+		}
+
+		uint32_t bTarget = target + info.op1.immediate + 8;
+
+		if (ELFEntry(elf) == bTarget) {
+			ELFProgramHeadersDeinit(&ph);
+			return true;
+		}
+	}
+
+	ELFProgramHeadersDeinit(&ph);
+	return false;
+}
+#endif
+
 bool GBAIsROM(struct VFile* vf) {
 	if (!vf) {
 		return false;
@@ -605,7 +662,7 @@ bool GBAIsROM(struct VFile* vf) {
 		uint32_t entry = ELFEntry(elf);
 		bool isGBA = true;
 		isGBA = isGBA && ELFMachine(elf) == EM_ARM;
-		isGBA = isGBA && (entry == BASE_CART0 || entry == BASE_WORKING_RAM + 0xC0);
+		isGBA = isGBA && (GBAVerifyELFEntry(elf, BASE_CART0) || GBAVerifyELFEntry(elf, BASE_WORKING_RAM + 0xC0));
 		ELFClose(elf);
 		return isGBA;
 	}
@@ -661,7 +718,7 @@ bool GBAIsMB(struct VFile* vf) {
 #ifdef USE_ELF
 	struct ELF* elf = ELFOpen(vf);
 	if (elf) {
-		bool isMB = ELFEntry(elf) == BASE_WORKING_RAM + 0xC0;
+		bool isMB = GBAVerifyELFEntry(elf, BASE_WORKING_RAM + 0xC0);
 		ELFClose(elf);
 		return isMB;
 	}

src/platform/qt/AbstractUpdater.cpp

@@ -8,16 +8,17 @@
 #include <QNetworkAccessManager>
 #include <QNetworkReply>
 
+#include "GBAApp.h"
+
 using namespace QGBA;
 
 AbstractUpdater::AbstractUpdater(QObject* parent)
 	: QObject(parent)
-	, m_netman(new QNetworkAccessManager(this))
 {
 }
 
 void AbstractUpdater::checkUpdate() {
-	QNetworkReply* reply = m_netman->get(QNetworkRequest(manifestLocation()));
+	QNetworkReply* reply = GBAApp::app()->httpGet(manifestLocation());
 	chaseRedirects(reply, &AbstractUpdater::manifestDownloaded);
 }
 
@@ -36,7 +37,7 @@ void AbstractUpdater::downloadUpdate() {
 		return;
 	}
 	m_isUpdating = true;
-	QNetworkReply* reply = m_netman->get(QNetworkRequest(url));
+	QNetworkReply* reply = GBAApp::app()->httpGet(url);
 	chaseRedirects(reply, &AbstractUpdater::updateDownloaded);
 }
 
@@ -54,7 +55,7 @@ void AbstractUpdater::chaseRedirects(QNetworkReply* reply, void (AbstractUpdater
 	connect(reply, &QNetworkReply::finished, this, [this, reply, cb]() {
 		// TODO: check domains, etc
 		if (reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt() / 100 == 3) {
-			QNetworkReply* newReply = m_netman->get(QNetworkRequest(reply->header(QNetworkRequest::LocationHeader).toString()));
+			QNetworkReply* newReply = GBAApp::app()->httpGet(reply->header(QNetworkRequest::LocationHeader).toString());
 			chaseRedirects(newReply, cb);
 		} else {
 			(this->*cb)(reply);
@@ -69,7 +70,7 @@ void AbstractUpdater::manifestDownloaded(QNetworkReply* reply) {
 		if (!url.isValid()) {
 			emit updateDone(false);
 		} else {
-			QNetworkReply* reply = m_netman->get(QNetworkRequest(url));
+			QNetworkReply* reply = GBAApp::app()->httpGet(url);
 			chaseRedirects(reply, &AbstractUpdater::updateDownloaded);
 		}
 	} else {

src/platform/qt/AbstractUpdater.h

@@ -9,7 +9,6 @@
 #include <QFile>
 #include <QObject>
 
-class QNetworkAccessManager;
 class QNetworkReply;
 
 namespace QGBA {
@@ -44,7 +43,6 @@ private:
 	void updateDownloaded(QNetworkReply*);
 
 	bool m_isUpdating = false;
-	QNetworkAccessManager* m_netman;
 	QByteArray m_manifest;
 };
 

src/platform/qt/ForwarderController.cpp

@@ -11,6 +11,7 @@
 #include <QNetworkReply>
 
 #include "ConfigController.h"
+#include "GBAApp.h"
 #include "VFileDevice.h"
 
 #include <mgba/core/version.h>
@@ -29,10 +30,8 @@ const char* SUFFIX = "";
 
 ForwarderController::ForwarderController(QObject* parent)
 	: QObject(parent)
-	, m_netman(new QNetworkAccessManager(this))
 	, m_originalPath(qgetenv("PATH"))
 {
-	m_netman->setRedirectPolicy(QNetworkRequest::NoLessSafeRedirectPolicy);
 	connect(this, &ForwarderController::buildFailed, this, &ForwarderController::cleanup);
 	connect(this, &ForwarderController::buildComplete, this, &ForwarderController::cleanup);
 }
@@ -83,14 +82,12 @@ void ForwarderController::downloadForwarderKit() {
 	emit buildFailed();
 	return;
 #endif
-	QNetworkReply* reply = m_netman->get(QNetworkRequest(QUrl(fkUrl)));
+	QNetworkReply* reply = GBAApp::app()->httpGet(QUrl(fkUrl));
-	connect(reply, &QNetworkReply::finished, this, [this, reply]() {
+	connectReply(reply, FORWARDER_KIT, &ForwarderController::gotForwarderKit);
-		gotForwarderKit(reply);
-	});
-	connectErrorFailure(reply);
 }
 
 void ForwarderController::gotForwarderKit(QNetworkReply* reply) {
+	emit downloadComplete(FORWARDER_KIT);
 	if (reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt() != 200) {
 		emit buildFailed();
 		return;
@@ -134,14 +131,12 @@ void ForwarderController::gotForwarderKit(QNetworkReply* reply) {
 }
 
 void ForwarderController::downloadManifest() {
-	QNetworkReply* reply = m_netman->get(QNetworkRequest(QUrl("https://mgba.io/latest.ini")));
+	QNetworkReply* reply = GBAApp::app()->httpGet(QUrl("https://mgba.io/latest.ini"));
-	connect(reply, &QNetworkReply::finished, this, [this, reply]() {
+	connectReply(reply, MANIFEST, &ForwarderController::gotManifest);
-		gotManifest(reply);
-	});
-	connectErrorFailure(reply);
 }
 
 void ForwarderController::gotManifest(QNetworkReply* reply) {
+	emit downloadComplete(MANIFEST);
 	if (reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt() != 200) {
 		emit buildFailed();
 		return;
@@ -177,20 +172,17 @@ void ForwarderController::downloadBuild(const QUrl& url) {
 		emit buildFailed();
 		return;		
 	}
-	QNetworkReply* reply = m_netman->get(QNetworkRequest(url));
+	QNetworkReply* reply = GBAApp::app()->httpGet(url);
-
-	connect(reply, &QNetworkReply::finished, this, [this, reply]() {
-		gotBuild(reply);
-	});
 
+	connectReply(reply, BASE, &ForwarderController::gotBuild);
 	connect(reply, &QNetworkReply::readyRead, this, [this, reply]() {
 		QByteArray data = reply->readAll();
 		m_sourceFile.write(data);
 	});
-	connectErrorFailure(reply);
 }
 
 void ForwarderController::gotBuild(QNetworkReply* reply) {
+	emit downloadComplete(BASE);
 	if (reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt() != 200) {
 		emit buildFailed();
 		return;
@@ -199,7 +191,13 @@ void ForwarderController::gotBuild(QNetworkReply* reply) {
 	QByteArray data = reply->readAll();
 	m_sourceFile.write(data);
 	m_sourceFile.close();
-	m_generator->rebuild(m_sourceFile.fileName(), m_outFilename);
+
+	QString extracted = m_generator->extract(m_sourceFile.fileName());
+	if (extracted.isNull()) {
+		emit buildFailed();
+		return;
+	}
+	m_generator->rebuild(extracted, m_outFilename);
 }
 
 void ForwarderController::cleanup() {
@@ -223,7 +221,7 @@ bool ForwarderController::toolInstalled(const QString& tool) {
 	return false;
 }
 
-void ForwarderController::connectErrorFailure(QNetworkReply* reply) {
+void ForwarderController::connectReply(QNetworkReply* reply, Download download, void (ForwarderController::*next)(QNetworkReply*)) {
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
 	connect(reply, &QNetworkReply::errorOccurred, this, [this, reply]() {
 #else
@@ -231,4 +229,12 @@ void ForwarderController::connectErrorFailure(QNetworkReply* reply) {
 #endif
 		emit buildFailed();
 	});
+
+	connect(reply, &QNetworkReply::finished, this, [this, reply, next]() {
+		(this->*next)(reply);
+	});
+	connect(reply, &QNetworkReply::downloadProgress, this, [this, download](qint64 bytesReceived, qint64 bytesTotal) {
+		emit downloadProgress(download, bytesReceived, bytesTotal);
+	});
+	emit downloadStarted(download);
 }

src/platform/qt/ForwarderController.h

@@ -12,7 +12,6 @@
 
 #include <memory>
 
-class QNetworkAccessManager;
 class QNetworkReply;
 
 namespace QGBA {
@@ -21,17 +20,27 @@ class ForwarderController : public QObject {
 Q_OBJECT
 
 public:
+	enum Download : int {
+		MANIFEST,
+		BASE,
+		FORWARDER_KIT
+	};
 	ForwarderController(QObject* parent = nullptr);
 
 	void setGenerator(std::unique_ptr<ForwarderGenerator>&& generator);
 	ForwarderGenerator* generator() { return m_generator.get(); }
 
 	QString channel() const { return m_channel; }
+	bool inProgress() const { return m_inProgress; }
 
 public slots:
 	void startBuild(const QString& outFilename);
 
 signals:
+	void buildStarted(bool needsForwarderKit);
+	void downloadStarted(Download which);
+	void downloadComplete(Download which);
+	void downloadProgress(Download which, qint64 bytesGotten, qint64 bytesTotal);
 	void buildComplete();
 	void buildFailed();
 
@@ -47,11 +56,10 @@ private:
 	bool toolInstalled(const QString& tool);
 	void cleanup();
 
-	void connectErrorFailure(QNetworkReply*);
+	void connectReply(QNetworkReply*, Download, void (ForwarderController::*next)(QNetworkReply*));
 
 	QString m_channel{"dev"};
 	QString m_outFilename;
-	QNetworkAccessManager* m_netman;
 	std::unique_ptr<ForwarderGenerator> m_generator;
 	QFile m_sourceFile;
 	bool m_inProgress = false;

src/platform/qt/ForwarderGenerator.cpp

@@ -10,6 +10,10 @@
 
 #include "ForwarderGenerator3DS.h"
 #include "ForwarderGeneratorVita.h"
+#include "utils.h"
+#include "VFileDevice.h"
+
+#include <mgba-util/vfs.h>
 
 using namespace QGBA;
 
@@ -73,6 +77,40 @@ QString ForwarderGenerator::systemName(ForwarderGenerator::System system) {
 	return {};
 }
 
+QString ForwarderGenerator::systemHumanName(ForwarderGenerator::System system) {
+	switch (system) {
+	case ForwarderGenerator::System::N3DS:
+		return tr("3DS");
+	case ForwarderGenerator::System::VITA:
+		return tr("Vita");
+	}
+
+	return {};
+}
+
+QString ForwarderGenerator::extract(const QString& archive) {
+	VDir* inArchive = VFileDevice::openArchive(archive);
+	if (!inArchive) {
+		return {};
+	}
+	bool gotFile = extractMatchingFile(inArchive, [this](VDirEntry* dirent) -> QString {
+		if (dirent->type(dirent) != VFS_FILE) {
+			return {};
+		}
+		QString filename(dirent->name(dirent));
+		if (!filename.endsWith("." + extension())) {
+			return {};
+		}
+		return "tmp." + extension();
+	});
+	inArchive->close(inArchive);
+
+	if (gotFile) {
+		return QLatin1String("tmp.") + extension();
+	}
+	return {};
+}
+
 QString ForwarderGenerator::base36(const QByteArray& bytes, int length) {
 	static const char* alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 	QString buffer(length, 'X');

src/platform/qt/ForwarderGenerator.h

@@ -40,12 +40,15 @@ public:
 	virtual QList<QPair<QString, QSize>> imageTypes() const = 0;
 	virtual System system() const = 0;
 	QString systemName() const { return systemName(system()); }
+	QString systemHumanName() const { return systemHumanName(system()); }
 	virtual QString extension() const = 0;
 
 	virtual QStringList externalTools() const { return {}; }
 
 	static QString systemName(System);
+	static QString systemHumanName(System);
 
+	virtual QString extract(const QString& archive);
 	virtual void rebuild(const QString& source, const QString& target) = 0;
 
 signals:

src/platform/qt/ForwarderGenerator3DS.cpp

@@ -6,8 +6,6 @@
 #include "ForwarderGenerator3DS.h"
 
 #include "ConfigController.h"
-#include "utils.h"
-#include "VFileDevice.h"
 
 #include <QDir>
 #include <QFile>
@@ -34,39 +32,11 @@ QList<QPair<QString, QSize>> ForwarderGenerator3DS::imageTypes() const {
 }
 
 void ForwarderGenerator3DS::rebuild(const QString& source, const QString& target) {
-	m_cia = dumpCia(source);
+	m_cia = source;
-	if (m_cia.isNull()) {
-		emit buildFailed();
-		return;
-	}
-
 	m_target = target;
 	extractCia();
 }
 
-QString ForwarderGenerator3DS::dumpCia(const QString& archive) {
-	VDir* inArchive = VFileDevice::openArchive(archive);
-	if (!inArchive) {
-		return {};
-	}
-	bool gotFile = extractMatchingFile(inArchive, [](VDirEntry* dirent) -> QString {
-		if (dirent->type(dirent) != VFS_FILE) {
-			return {};
-		}
-		QString filename(dirent->name(dirent));
-		if (!filename.endsWith(".cia")) {
-			return {};
-		}
-		return "tmp.cia";
-	});
-	inArchive->close(inArchive);
-
-	if (gotFile) {
-		return QLatin1String("tmp.cia");
-	}
-	return {};
-}
-
 void ForwarderGenerator3DS::extractCia() {
 	m_currentProc = std::make_unique<QProcess>();
 	m_currentProc->setProgram("ctrtool");

src/platform/qt/ForwarderGenerator3DS.h

@@ -43,7 +43,6 @@ private slots:
 	void cleanup();
 
 private:
-	QString dumpCia(const QString& archive);
 	void init3dstoolArgs(QStringList& args, const QString& file, const QString& createType = {});
 
 	std::unique_ptr<QProcess> m_currentProc;

src/platform/qt/ForwarderGeneratorVita.cpp

@@ -8,7 +8,6 @@
 #include <QFileInfo>
 #include <QTemporaryFile>
 
-#include "utils.h"
 #include "VFileDevice.h"
 
 #include <mgba-util/sfo.h>
@@ -30,15 +29,9 @@ QList<QPair<QString, QSize>> ForwarderGeneratorVita::imageTypes() const {
 }
 
 void ForwarderGeneratorVita::rebuild(const QString& source, const QString& target) {
-	QString vpk = dumpVpk(source);
+	QFile vpkFile(source);
-	if (vpk.isNull()) {
-		emit buildFailed();
-		return;
-	}
-
-	QFile vpkFile(vpk);
 	VDir* outdir = VDirOpenZip(target.toLocal8Bit().constData(), O_WRONLY | O_CREAT | O_TRUNC);
-	if (outdir && !copyAssets(vpk, outdir)) {
+	if (outdir && !copyAssets(source, outdir)) {
 		outdir->close(outdir);
 		outdir = nullptr;
 	}
@@ -79,29 +72,6 @@ void ForwarderGeneratorVita::rebuild(const QString& source, const QString& targe
 	emit buildComplete();
 }
 
-QString ForwarderGeneratorVita::dumpVpk(const QString& archive) {
-	VDir* inArchive = VFileDevice::openArchive(archive);
-	if (!inArchive) {
-		return {};
-	}
-	bool gotFile = extractMatchingFile(inArchive, [](VDirEntry* dirent) -> QString {
-		if (dirent->type(dirent) != VFS_FILE) {
-			return {};
-		}
-		QString filename(dirent->name(dirent));
-		if (!filename.endsWith(".vpk")) {
-			return {};
-		}
-		return "tmp.vpk";
-	});
-	inArchive->close(inArchive);
-
-	if (gotFile) {
-		return QLatin1String("tmp.vpk");
-	}
-	return {};
-}
-
 bool ForwarderGeneratorVita::copyAssets(const QString& vpk, VDir* outdir) {
 	VDir* indir = VDirOpenZip(vpk.toLocal8Bit().constData(), O_RDONLY);
 	if (!indir) {

src/platform/qt/ForwarderGeneratorVita.h

@@ -25,7 +25,6 @@ public:
 	void rebuild(const QString& source, const QString& target) override;
 
 private:
-	QString dumpVpk(const QString& archive);
 	bool copyAssets(const QString& vpk, VDir* out);
 	QString makeSerial() const;
 	void writeSfo(VFile* out);

src/platform/qt/ForwarderView.cpp

@@ -32,13 +32,49 @@ ForwarderView::ForwarderView(QWidget* parent)
 	connect(m_ui.imageSelect, qOverload<int>(&QComboBox::currentIndexChanged), this, &ForwarderView::setActiveImage);
 	connect(m_ui.imageBrowse, &QAbstractButton::clicked, this, &ForwarderView::selectImage);
 
-	connect(&m_controller, &ForwarderController::buildComplete, this, &QDialog::accept);
+	connect(&m_controller, &ForwarderController::buildComplete, this, [this]() {
+		QMessageBox* message = new QMessageBox(QMessageBox::Information, tr("Build finished"),
+		                                       tr("Forwarder finished building"),
+		                                       QMessageBox::Ok, parentWidget(), Qt::Sheet);
+		message->setAttribute(Qt::WA_DeleteOnClose);
+		message->show();
+		accept();
+	});
 	connect(&m_controller, &ForwarderController::buildFailed, this, [this]() {
 		QMessageBox* error = new QMessageBox(QMessageBox::Critical, tr("Build failed"),
 		                                     tr("Failed to build forwarder"),
 		                                     QMessageBox::Ok, this, Qt::Sheet);
 		error->setAttribute(Qt::WA_DeleteOnClose);
 		error->show();
+
+		m_ui.progressBar->setValue(0);
+		m_ui.progressBar->setEnabled(false);
+		validate();
+	});
+	connect(&m_controller, &ForwarderController::downloadStarted, this, [this](ForwarderController::Download download) {
+		m_currentDownload = download;
+		m_downloadProgress = 0;
+		if (download == ForwarderController::FORWARDER_KIT) {
+			m_needsForwarderKit = true;
+		}
+		updateProgress();
+	});
+	connect(&m_controller, &ForwarderController::downloadComplete, this, [this](ForwarderController::Download download) {
+		if (m_currentDownload != download) {
+			return;
+		}
+		m_downloadProgress = 1;
+		updateProgress();
+	});
+	connect(&m_controller, &ForwarderController::downloadProgress, this, [this](ForwarderController::Download download, qint64 bytesReceived, qint64 bytesTotal) {
+		if (m_currentDownload != download) {
+			return;
+		}
+		if (bytesTotal <= 0 || bytesTotal < bytesReceived) {
+			return;
+		}
+		m_downloadProgress = bytesReceived / static_cast<qreal>(bytesTotal);
+		updateProgress();
 	});
 
 	connect(m_ui.system3DS, &QAbstractButton::clicked, this, [this]() {
@@ -59,6 +95,13 @@ void ForwarderView::build() {
 	m_controller.generator()->setTitle(m_ui.title->text());
 	m_controller.generator()->setRom(m_ui.romFilename->text());
 	m_controller.startBuild(m_ui.outputFilename->text());
+	m_ui.buttonBox->button(QDialogButtonBox::Ok)->setEnabled(false);
+	m_ui.progressBar->setEnabled(true);
+
+	m_currentDownload = ForwarderController::FORWARDER_KIT;
+	m_downloadProgress = 0;
+	m_needsForwarderKit = false;
+	updateProgress();
 }
 
 void ForwarderView::validate() {
@@ -80,6 +123,9 @@ void ForwarderView::validate() {
 	if (m_ui.baseType->currentIndex() != 1) {
 		valid = false;
 	}
+	if (m_controller.inProgress()) {
+		valid = false;
+	}
 	m_ui.buttonBox->button(QDialogButtonBox::Ok)->setEnabled(valid);
 }
 
@@ -105,10 +151,18 @@ void ForwarderView::setSystem(ForwarderGenerator::System system) {
 void ForwarderView::connectBrowseButton(QAbstractButton* button, QLineEdit* lineEdit, const QString& title, bool save, const QString& filter) {
 	connect(button, &QAbstractButton::clicked, lineEdit, [this, lineEdit, save, title, filter]() {
 		QString filename;
+		QString usedFilter = filter;
+		if (filter.isEmpty()) {
+			// Use the forwarder type, if selected
+			ForwarderGenerator* generator = m_controller.generator();
+			if (generator) {
+				usedFilter = tr("%1 installable package (*.%2)").arg(generator->systemHumanName()).arg(generator->extension());
+			}
+		}
 		if (save) {
-			filename = GBAApp::app()->getSaveFileName(this, title, filter);
+			filename = GBAApp::app()->getSaveFileName(this, title, usedFilter);
 		} else {
-			filename = GBAApp::app()->getOpenFileName(this, title, filter);			
+			filename = GBAApp::app()->getOpenFileName(this, title, usedFilter);
 		}
 		if (filename.isEmpty()) {
 			return;
@@ -154,3 +208,25 @@ void ForwarderView::setActiveImage(int index) {
 	m_ui.imagePreview->setMaximumSize(m_activeSize);
 	m_ui.imagePreview->setPixmap(QPixmap::fromImage(m_controller.generator()->image(index)));
 }
+
+void ForwarderView::updateProgress() {
+	switch (m_currentDownload) {
+	case ForwarderController::FORWARDER_KIT:
+		m_ui.progressBar->setValue(m_downloadProgress * 450);
+		break;
+	case ForwarderController::MANIFEST:
+		if (m_needsForwarderKit) {
+			m_ui.progressBar->setValue(450 + m_downloadProgress * 50);
+		} else {
+			m_ui.progressBar->setValue(m_downloadProgress * 100);		
+		}
+		break;
+	case ForwarderController::BASE:
+		if (m_needsForwarderKit) {
+			m_ui.progressBar->setValue(500 + m_downloadProgress * 500);
+		} else {
+			m_ui.progressBar->setValue(100 + m_downloadProgress * 900);			
+		}
+		break;
+	}
+}

src/platform/qt/ForwarderView.h

@@ -30,12 +30,17 @@ private:
 	void connectBrowseButton(QAbstractButton* button, QLineEdit* lineEdit, const QString& title, bool save = false, const QString& filter = {});
 	void selectImage();
 	void setActiveImage(int);
+	void updateProgress();
 
 	ForwarderController m_controller;
 	QVector<QImage> m_images;
 	int m_currentImage;
 	QSize m_activeSize;
 
+	qreal m_downloadProgress;
+	ForwarderController::Download m_currentDownload;
+	bool m_needsForwarderKit;
+
 	Ui::ForwarderView m_ui;
 };
 

src/platform/qt/ForwarderView.ui

@@ -14,51 +14,6 @@
    <string>Create forwarder</string>
   </property>
   <layout class="QGridLayout" name="gridLayout">
-   <item row="0" column="0">
-    <widget class="QGroupBox" name="groupBox">
-     <property name="sizePolicy">
-      <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
-       <horstretch>0</horstretch>
-       <verstretch>0</verstretch>
-      </sizepolicy>
-     </property>
-     <property name="title">
-      <string>System</string>
-     </property>
-     <layout class="QHBoxLayout" name="horizontalLayout_2">
-      <item alignment="Qt::AlignHCenter">
-       <widget class="QRadioButton" name="system3DS">
-        <property name="text">
-         <string>3DS</string>
-        </property>
-        <attribute name="buttonGroup">
-         <string notr="true">system</string>
-        </attribute>
-       </widget>
-      </item>
-      <item alignment="Qt::AlignHCenter">
-       <widget class="QRadioButton" name="systemVita">
-        <property name="text">
-         <string>Vita</string>
-        </property>
-        <attribute name="buttonGroup">
-         <string notr="true">system</string>
-        </attribute>
-       </widget>
-      </item>
-     </layout>
-    </widget>
-   </item>
-   <item row="3" column="0" colspan="2">
-    <widget class="QDialogButtonBox" name="buttonBox">
-     <property name="orientation">
-      <enum>Qt::Horizontal</enum>
-     </property>
-     <property name="standardButtons">
-      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
-     </property>
-    </widget>
-   </item>
    <item row="1" column="0">
     <widget class="QGroupBox" name="groupBox_3">
      <property name="title">
@@ -168,6 +123,51 @@
      </layout>
     </widget>
    </item>
+   <item row="0" column="0">
+    <widget class="QGroupBox" name="groupBox">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="title">
+      <string>System</string>
+     </property>
+     <layout class="QHBoxLayout" name="horizontalLayout_2">
+      <item alignment="Qt::AlignHCenter">
+       <widget class="QRadioButton" name="system3DS">
+        <property name="text">
+         <string>3DS</string>
+        </property>
+        <attribute name="buttonGroup">
+         <string notr="true">system</string>
+        </attribute>
+       </widget>
+      </item>
+      <item alignment="Qt::AlignHCenter">
+       <widget class="QRadioButton" name="systemVita">
+        <property name="text">
+         <string>Vita</string>
+        </property>
+        <attribute name="buttonGroup">
+         <string notr="true">system</string>
+        </attribute>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item row="3" column="0" colspan="2">
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
    <item row="0" column="1" rowspan="2">
     <widget class="QGroupBox" name="groupBox_2">
      <property name="title">
@@ -399,6 +399,19 @@
      </layout>
     </widget>
    </item>
+   <item row="2" column="0" colspan="2">
+    <widget class="QProgressBar" name="progressBar">
+     <property name="enabled">
+      <bool>false</bool>
+     </property>
+     <property name="maximum">
+      <number>1000</number>
+     </property>
+     <property name="textVisible">
+      <bool>false</bool>
+     </property>
+    </widget>
+   </item>
   </layout>
  </widget>
  <resources/>

src/platform/qt/GBAApp.cpp

@@ -19,6 +19,7 @@
 #include <QFontDatabase>
 #include <QIcon>
 
+#include <mgba/core/version.h>
 #include <mgba/feature/updater.h>
 #include <mgba-util/socket.h>
 #include <mgba-util/vfs.h>
@@ -81,6 +82,8 @@ GBAApp::GBAApp(int& argc, char* argv[], ConfigController* config)
 	m_configController->updateOption("useDiscordPresence");
 #endif
 
+	m_netman.setRedirectPolicy(QNetworkRequest::NoLessSafeRedirectPolicy);
+
 	cleanupAfterUpdate();
 
 	connect(this, &GBAApp::aboutToQuit, this, &GBAApp::cleanup);
@@ -240,6 +243,19 @@ bool GBAApp::reloadGameDB() {
 }
 #endif
 
+QNetworkAccessManager* GBAApp::netman() {
+	return &m_netman;
+}
+
+QNetworkReply* GBAApp::httpGet(const QUrl& url) {
+	QNetworkRequest req(url);
+	req.setHeader(QNetworkRequest::UserAgentHeader,
+	              QString("%1/%2 (+https://mgba.io) is definitely not Mozilla/5.0")
+	              .arg(projectName)
+	              .arg(projectVersion));
+	return m_netman.get(req);
+}
+
 qint64 GBAApp::submitWorkerJob(std::function<void ()> job, std::function<void ()> callback) {
 	return submitWorkerJob(job, nullptr, callback);
 }

src/platform/qt/GBAApp.h

@@ -11,7 +11,8 @@
 #include <QList>
 #include <QMap>
 #include <QMultiMap>
-#include <QObject>
+#include <QNetworkAccessManager>
+#include <QNetworkReply>
 #include <QRunnable>
 #include <QString>
 #include <QThreadPool>
@@ -70,6 +71,9 @@ public:
 	const NoIntroDB* gameDB() const { return m_db; }
 	bool reloadGameDB();
 
+	QNetworkAccessManager* netman();
+	QNetworkReply* httpGet(const QUrl&);
+
 	qint64 submitWorkerJob(std::function<void ()> job, std::function<void ()> callback = {});
 	qint64 submitWorkerJob(std::function<void ()> job, QObject* context, std::function<void ()> callback);
 	bool removeWorkerJob(qint64 jobId);
@@ -128,6 +132,8 @@ private:
 	QFont m_monospace;
 
 	NoIntroDB* m_db = nullptr;
+
+	QNetworkAccessManager m_netman;
 };
 
 }