Add function for detecting text encoding

src/CMakeLists.txt

@@ -59,6 +59,7 @@ set(SOURCES
   utilities/coverutils.cpp
   utilities/screenutils.cpp
   utilities/searchparserutils.cpp
+  utilities/textencodingutils.cpp
 
   engine/enginebase.cpp
   engine/enginedevice.cpp

src/utilities/textencodingutils.cpp

@@ -0,0 +1,55 @@
+/*
+ * Strawberry Music Player
+ * Copyright 2024, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <unicode/ucsdet.h>
+
+#include <QByteArray>
+#include <QString>
+#include <QScopeGuard>
+
+#include "textencodingutils.h"
+
+namespace Utilities {
+
+QByteArray TextEncodingFromData(const QByteArray &data) {
+
+  UErrorCode error_code = U_ZERO_ERROR;
+  UCharsetDetector *csd = ucsdet_open(&error_code);
+  if (error_code != U_ZERO_ERROR) {
+    return QByteArray();
+  }
+  const QScopeGuard scopeguard_csd = qScopeGuard([csd]() { ucsdet_close(csd); });
+  ucsdet_setText(csd, data.constData(), static_cast<int>(data.length()), &error_code);
+  if (error_code != U_ZERO_ERROR) {
+    return QByteArray();
+  }
+  const UCharsetMatch *ucm = ucsdet_detect(csd, &error_code);
+  if (error_code != U_ZERO_ERROR) {
+    return QByteArray();
+  }
+  const char *encoding_name = ucsdet_getName(ucm, &error_code);
+  if (error_code != U_ZERO_ERROR) {
+    return QByteArray();
+  }
+
+  return encoding_name;
+
+}
+
+}  // namespace Utilities

src/utilities/textencodingutils.h

@@ -0,0 +1,30 @@
+/*
+ * Strawberry Music Player
+ * Copyright 2024, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef TEXTENCODINGUTILS_H
+#define TEXTENCODINGUTILS_H
+
+#include <QByteArray>
+#include <QString>
+
+namespace Utilities {
+QByteArray TextEncodingFromData(const QByteArray &data);
+}  // namespace Utilities
+
+#endif // TEXTENCODINGUTILS_H