Qt: Split out some helper functions

src/platform/qt/ForwarderGenerator.cpp

@@ -72,3 +72,19 @@ QString ForwarderGenerator::systemName(ForwarderGenerator::System system) {
 
 	return {};
 }
+
+QString ForwarderGenerator::base36(const QByteArray& bytes, int length) {
+	static const char* alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+	QString buffer(length, 'X');
+	quint32 running = 0;
+	for (int i = 0, j = 0; i < length; ++i) {
+		if (running < 36) {
+			running <<= 8;
+			running |= static_cast<quint8>(bytes[j]);
+			++j;
+		}
+		buffer[i] = alphabet[running % 36];
+		running /= 36;
+	}
+	return buffer;
+}

src/platform/qt/ForwarderGenerator.h

@@ -48,6 +48,8 @@ public:
 protected:
 	ForwarderGenerator(int imageTypes, QObject* parent = nullptr);
 
+	static QString base36(const QByteArray&, int length);
+
 private:
 	QString m_title;
 	QString m_romPath;

src/platform/qt/ForwarderGeneratorVita.cpp

@@ -8,6 +8,7 @@
 #include <QFileInfo>
 #include <QTemporaryFile>
 
+#include "utils.h"
 #include "VFileDevice.h"
 
 #include <mgba-util/sfo.h>
@@ -77,29 +78,20 @@ bool ForwarderGeneratorVita::rebuild(const QString& source, const QString& targe
 }
 
 QString ForwarderGeneratorVita::dumpVpk(const QString& archive) {
-	bool gotFile = false;
-
 	VDir* inArchive = VFileDevice::openArchive(archive);
 	if (!inArchive) {
 		return {};
 	}
-	for (VDirEntry* dirent = inArchive->listNext(inArchive); dirent; dirent = inArchive->listNext(inArchive)) {
+	bool gotFile = extractMatchingFile(inArchive, [](VDirEntry* dirent) -> QString {
 		if (dirent->type(dirent) != VFS_FILE) {
-			continue;
+			return {};
 		}
 		QString filename(dirent->name(dirent));
 		if (!filename.endsWith(".vpk")) {
-			continue;
+			return {};
 		}
-
-		VFile* outfile = VFileOpen("tmp.vpk", O_WRONLY | O_TRUNC | O_CREAT);
-		VFile* vpk = inArchive->openFile(inArchive, dirent->name(dirent), O_RDONLY);
-		VFileDevice::copyFile(vpk, outfile);
-		vpk->close(vpk);
-		outfile->close(outfile);
-		gotFile = true;
-		break;
-	}
+		return "tmp.vpk";
+	});
 	inArchive->close(inArchive);
 
 	if (gotFile) {
@@ -156,16 +148,8 @@ bool ForwarderGeneratorVita::copyAssets(const QString& vpk, VDir* outdir) {
 }
 
 QString ForwarderGeneratorVita::makeSerial() const {
-	QByteArray hash = hashRom();
-	quint32 hashBits = (hash[0] << 24) | (hash[1] << 16) | (hash[2] << 8) | hash[3];
-
-	QString serial("MFXXXXXXX");
-	for (int i = 0; i < 7; ++i) {
-		static const char alphabet[37] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
-		serial[i + 2] = alphabet[hashBits % 36];
-		hashBits /= 36;
-	}
-
+	QString serial("MF");
+	serial += base36(hashRom(), 7);
 	return serial;
 }
 

src/platform/qt/utils.cpp

@@ -1,15 +1,17 @@
-/* Copyright (c) 2013-2017 Jeffrey Pfau
+/* Copyright (c) 2013-2022 Jeffrey Pfau
  *
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "utils.h"
 
-#include <mgba/core/version.h>
-
 #include <QCoreApplication>
 #include <QObject>
 
+#include "VFileDevice.h"
+
+#include <mgba/core/version.h>
+
 namespace QGBA {
 
 QString niceSizeFormat(size_t filesize) {
@@ -111,4 +113,20 @@ QString romFilters(bool includeMvl) {
 	return filters.join(";;");
 }
 
+bool extractMatchingFile(VDir* dir, std::function<QString (VDirEntry*)> filter) {
+	for (VDirEntry* entry = dir->listNext(dir); entry; entry = dir->listNext(dir)) {
+		QString target = filter(entry);
+		if (target.isNull()) {
+			continue;
+		}
+		VFile* outfile = VFileOpen(target.toUtf8().constData(), O_WRONLY | O_TRUNC | O_CREAT);
+		VFile* infile = dir->openFile(dir, entry->name(entry), O_RDONLY);
+		VFileDevice::copyFile(infile, outfile);
+		infile->close(infile);
+		outfile->close(outfile);
+		return true;
+	}
+	return false;
+}
+
 }

src/platform/qt/utils.h

@@ -7,6 +7,7 @@
 
 #include <mgba/core/core.h>
 #include <mgba-util/socket.h>
+#include <mgba-util/vfs.h>
 
 #include <QHostAddress>
 #include <QRect>
@@ -14,6 +15,10 @@
 #include <QString>
 
 #include <algorithm>
+#include <functional>
+
+struct VDir;
+struct VDirEntry;
 
 namespace QGBA {
 
@@ -68,5 +73,6 @@ constexpr const T& clamp(const T& v, const T& lo, const T& hi) {
 #endif
 
 QString romFilters(bool includeMvl = false);
+bool extractMatchingFile(VDir* dir, std::function<QString (VDirEntry*)> filter);
 
 }