qt: Use UTF-8 for file names on Windows

* lang/qt/src/qgpgmedecryptverifyarchivejob.cpp
(decrypt_verify_from_file_name): On Windows, convert Unicode file name
to UTF-8.
* lang/qt/src/qgpgmeencryptarchivejob.cpp (encrypt,
encrypt_to_filename): On Windows, convert Unicode file name from/to
UTF-8.
* lang/qt/src/qgpgmesignarchivejob.cpp (sign, sign_to_filename): Ditto.
* lang/qt/src/qgpgmesignencryptarchivejob.cpp (sign_encrypt,
sign_encrypt_to_filename): Ditto.
--

On Windows, GnuPG expects file names to be UTF-8-encoded. This fixes
encrypting and decrypting folders with umlauts in the folder name and
in the file name of the archive. Encrypting and decrypting folders
with kanji still fails.

GnuPG-bug-id: 6728

lang/qt/src/qgpgmedecryptverifyarchivejob.cpp

@@ -122,7 +122,11 @@ static QGpgMEDecryptVerifyArchiveJob::result_type decrypt_verify_from_file_name(
                                                                                 const QString &outputDirectory)
 {
     Data indata;
+#ifdef Q_OS_WIN
+    indata.setFileName(inputFile.toUtf8().constData());
+#else
     indata.setFileName(QFile::encodeName(inputFile).constData());
+#endif
 
     return decrypt_verify(ctx, indata, outputDirectory);
 }

lang/qt/src/qgpgmeencryptarchivejob.cpp

@@ -104,7 +104,11 @@ static QGpgMEEncryptArchiveJob::result_type encrypt(Context *ctx,
     flags = static_cast<Context::EncryptionFlags>(flags | Context::EncryptArchive);
     const auto encryptionResult = ctx->encrypt(recipients, indata, outdata, flags);
 
+#ifdef Q_OS_WIN
+    const auto outputFileName = QString::fromUtf8(outdata.fileName());
+#else
     const auto outputFileName = QFile::decodeName(outdata.fileName());
+#endif
     if (!outputFileName.isEmpty() && encryptionResult.error().code()) {
         // ensure that the output file is removed if the operation was canceled or failed
         if (QFile::exists(outputFileName)) {
@@ -143,7 +147,11 @@ static QGpgMEEncryptArchiveJob::result_type encrypt_to_filename(Context *ctx,
                                                                 const QString &baseDirectory)
 {
     Data outdata;
+#ifdef Q_OS_WIN
+    outdata.setFileName(outputFile.toUtf8().constData());
+#else
     outdata.setFileName(QFile::encodeName(outputFile).constData());
+#endif
 
     return encrypt(ctx, recipients, paths, outdata, flags, baseDirectory);
 }

lang/qt/src/qgpgmesignarchivejob.cpp

@@ -111,7 +111,11 @@ static QGpgMESignArchiveJob::result_type sign(Context *ctx,
 
     const auto signingResult = ctx->sign(indata, outdata, GpgME::SignArchive);
 
+#ifdef Q_OS_WIN
+    const auto outputFileName = QString::fromUtf8(outdata.fileName());
+#else
     const auto outputFileName = QFile::decodeName(outdata.fileName());
+#endif
     if (!outputFileName.isEmpty() && signingResult.error().code()) {
         // ensure that the output file is removed if the operation was canceled or failed
         if (QFile::exists(outputFileName)) {
@@ -148,7 +152,11 @@ static QGpgMESignArchiveJob::result_type sign_to_filename(Context *ctx,
                                                           const QString &baseDirectory)
 {
     Data outdata;
+#ifdef Q_OS_WIN
+    outdata.setFileName(outputFile.toUtf8().constData());
+#else
     outdata.setFileName(QFile::encodeName(outputFile).constData());
+#endif
 
     return sign(ctx, signers, paths, outdata, baseDirectory);
 }

lang/qt/src/qgpgmesignencryptarchivejob.cpp

@@ -116,7 +116,11 @@ static QGpgMESignEncryptArchiveJob::result_type sign_encrypt(Context *ctx,
     const auto &signingResult = res.first;
     const auto &encryptionResult = res.second;
 
+#ifdef Q_OS_WIN
+    const auto outputFileName = QString::fromUtf8(outdata.fileName());
+#else
     const auto outputFileName = QFile::decodeName(outdata.fileName());
+#endif
     if (!outputFileName.isEmpty() && (signingResult.error().code() || encryptionResult.error().code())) {
         // ensure that the output file is removed if the operation was canceled or failed
         if (QFile::exists(outputFileName)) {
@@ -157,7 +161,11 @@ static QGpgMESignEncryptArchiveJob::result_type sign_encrypt_to_filename(Context
                                                                          const QString &baseDirectory)
 {
     Data outdata;
+#ifdef Q_OS_WIN
+    outdata.setFileName(outputFile.toUtf8().constData());
+#else
     outdata.setFileName(QFile::encodeName(outputFile).constData());
+#endif
 
     return sign_encrypt(ctx, signers, recipients, paths, outdata, encryptionFlags, baseDirectory);
 }