diff --git a/include/qarchive_enums.hpp b/include/qarchive_enums.hpp
index 0919532..2071508 100644
--- a/include/qarchive_enums.hpp
+++ b/include/qarchive_enums.hpp
@@ -67,7 +67,7 @@ enum : short {
  * These codes are used to represent Archive formats in form
  * of a short integer.
 */
-enum : short {
+enum formats : short {
     TarFormat = 200,
     ZipFormat,
     SevenZipFormat,
diff --git a/include/qarchivecompressor_p.hpp b/include/qarchivecompressor_p.hpp
index cee75ac..271de5e 100644
--- a/include/qarchivecompressor_p.hpp
+++ b/include/qarchivecompressor_p.hpp
@@ -18,7 +18,7 @@ namespace QArchive {
 class CompressorPrivate : public QObject {
     Q_OBJECT
   public:
-    CompressorPrivate(bool memoryMode = false);
+    explicit CompressorPrivate(bool memoryMode = false);
     ~CompressorPrivate() override;
     CompressorPrivate(const CompressorPrivate&) = delete;
     CompressorPrivate& operator=(const CompressorPrivate&) = delete;
diff --git a/include/qarchiveextractor_p.hpp b/include/qarchiveextractor_p.hpp
index 8cabc32..5f12b51 100644
--- a/include/qarchiveextractor_p.hpp
+++ b/include/qarchiveextractor_p.hpp
@@ -35,7 +35,7 @@ class MutableMemoryFile {
 class ExtractorPrivate : public QObject {
     Q_OBJECT
   public:
-    ExtractorPrivate(bool memoryMode = false);
+    explicit ExtractorPrivate(bool memoryMode = false);
     ~ExtractorPrivate() override;
     ExtractorPrivate(const ExtractorPrivate&) = delete;
     ExtractorPrivate& operator=(const ExtractorPrivate&) = delete;
diff --git a/src/qarchive_enums.cc b/src/qarchive_enums.cc
index 2c0e3ab..0e143c2 100644
--- a/src/qarchive_enums.cc
+++ b/src/qarchive_enums.cc
@@ -4,95 +4,65 @@
 using namespace QArchive;
 
 QString QArchive::errorCodeToString(short errorCode) {
-    QString errorString;
     switch(errorCode) {
     case NoError:
-        errorString = QString("QArchive::NoError");
-        break;
+        return "QArchive::NoError";
     case NotEnoughMemory:
-        errorString = QString("QArchive::NotEnoughMemory");
-        break;
+        return "QArchive::NotEnoughMemory";
     case NoPermissionToWrite:
-        errorString = QString("QArchive::NoPermissionToWrite");
-        break;
+        return "QArchive::NoPermissionToWrite";
     case ArchiveNotGiven:
-        errorString = QString("QArchive::ArchiveNotGiven");
-        break;
+        return "QArchive::ArchiveNotGiven";
     case ArchiveDoesNotExists:
-        errorString = QString("QArchive::ArchiveDoesNotExists");
-        break;
+        return "QArchive::ArchiveDoesNotExists";
     case ArchiveReadError:
-        errorString = QString("QArchive::ArchiveReadError");
-        break;
+        return "QArchive::ArchiveReadError";
     case ArchiveWriteError:
-        errorString = QString("QArchive::ArchiveWriteError");
-        break;
+        return "QArchive::ArchiveWriteError";
     case ArchiveHeaderWriteError:
-        errorString = QString("QArchive::ArchiveHeaderWriteError");
-        break;
+        return "QArchive::ArchiveHeaderWriteError";
     case ArchiveCorrupted:
-        errorString = QString("QArchive::ArchiveCorrupted");
-        break;
+        return "QArchive::ArchiveCorrupted";
     case ArchiveIsNotReadable:
-        errorString = QString("QArchive::ArchiveIsNotReadable");
-        break;
+        return "QArchive::ArchiveIsNotReadable";
     case ArchiveIsNotOpened:
-        errorString = QString("QArchive::ArchiveIsNotOpened");
-        break;
+        return "QArchive::ArchiveIsNotOpened";
     case ArchivePasswordNeeded:
-        errorString = QString("QArchive::ArchivePasswordNeeded");
-        break;
+        return "QArchive::ArchivePasswordNeeded";
     case ArchivePasswordIncorrect:
-        errorString = QString("QArchive::ArchivePasswordIncorrect");
-        break;
+        return "QArchive::ArchivePasswordIncorrect";
     case CannotOpenArchive:
-        errorString = QString("QArchive::CannotOpenArchive");
-        break;
+        return "QArchive::CannotOpenArchive";
     case NoPermissionToReadArchive:
-        errorString = QString("QArchive::NoPermissionToReadArchive");
-        break;
+        return "QArchive::NoPermissionToReadArchive";
     case InvalidOutputDirectory:
-        errorString = QString("QArchive::InvalidOutputDirectory");
-        break;
+        return "QArchive::InvalidOutputDirectory";
     case InvalidArchiveFile:
-        errorString = QString("QArchive::InvalidArchiveFile");
-        break;
+        return "QArchive::InvalidArchiveFile";
     case ArchiveFileNameNotGiven:
-        errorString = QString("QArchive::ArchiveFileNameNotGiven");
-        break;
+        return "QArchive::ArchiveFileNameNotGiven";
     case ArchiveFileAlreadyExists:
-        errorString = QString("QArchive::ArchiveFileAlreadyExists");
-        break;
+        return "QArchive::ArchiveFileAlreadyExists";
     case ArchiveWriteOpenError:
-        errorString = QString("QArchive::ArchiveWriteOpenError");
-        break;
+        return "QArchive::ArchiveWriteOpenError";
     case ArchiveFatalError:
-        errorString = QString("QArchive::ArchiveFatalError");
-        break;
+        return "QArchive::ArchiveFatalError";
     case FileDoesNotExist:
-        errorString = QString("QArchive::FileDoesNotExist");
-        break;
+        return "QArchive::FileDoesNotExist";
     case DiskReadError:
-        errorString = QString("QArchive::DiskReadError");
-        break;
+        return "QArchive::DiskReadError";
     case DiskOpenError:
-        errorString = QString("QArchive::DiskOpenError");
-        break;
+        return "QArchive::DiskOpenError";
     case NoPermissionToReadFile:
-        errorString = QString("QArchive::NoPermissionToReadFile");
-        break;
+        return "QArchive::NoPermissionToReadFile";
     case NoFilesToCompress:
-        errorString = QString("QArchive::NoFilesToCompress");
-        break;
+        return "QArchive::NoFilesToCompress";
     case CannotOpenFile:
-        errorString = QString("QArchive::CannotOpenFile");
-        break;
+        return "QArchive::CannotOpenFile";
     case IODeviceSequential:
-        errorString = QString("QArchive::IODeviceSequential");
-        break;
+        return "QArchive::IODeviceSequential";
     default:
-        errorString = QString("QArchive::UnknownError");
-        break;
+        return "QArchive::UnknownError";
     }
-    return errorString;
+    return "";
 }
diff --git a/src/qarchivecompressor_p.cc b/src/qarchivecompressor_p.cc
index ef5c41c..8b2fd16 100644
--- a/src/qarchivecompressor_p.cc
+++ b/src/qarchivecompressor_p.cc
@@ -411,30 +411,20 @@ bool CompressorPrivate::guessArchiveFormat() {
     }
 
     auto ext = QFileInfo(m_TemporaryFile->fileName()).suffix().toLower();
-    if(ext == "bz") {
-        m_ArchiveFormat = BZipFormat;
-    } else if(ext == "bz2") {
-        m_ArchiveFormat = BZip2Format;
-    } else if(ext == "gz") {
-        m_ArchiveFormat = GZipFormat;
-    } else if(ext == "xz") {
-        m_ArchiveFormat = XzFormat;
-    } else if(ext == "tar") {
-        m_ArchiveFormat = TarFormat;
-    } else if(ext == "xar") {
-        m_ArchiveFormat = XarFormat;
-    } else if(ext == "zip") {
-        m_ArchiveFormat = ZipFormat;
-    } else if(ext == "7z") {
-        m_ArchiveFormat = SevenZipFormat;
-    } else if(ext == "zstd") {
-        m_ArchiveFormat = ZstdFormat;
-    } else {
-        m_ArchiveFormat = 0;
-        return false;
-    }
-
-    return true;
+    m_ArchiveFormat = [ext] {
+      if (ext == "bz") return BZipFormat;
+      if (ext == "bz2") return BZip2Format;
+      if (ext == "gz") return GZipFormat;
+      if (ext == "xz") return XzFormat;
+      if (ext == "tar") return TarFormat;
+      if (ext == "xar") return XarFormat;
+      if (ext == "zip") return ZipFormat;
+      if (ext == "7z") return SevenZipFormat;
+      if (ext == "zstd") return ZstdFormat;
+      return formats(0);
+    }();
+
+    return m_ArchiveFormat != 0;
 }
 
 // Confirms all the files that are stagged for compression , Returns true
diff --git a/src/qarchiveextractor_p.cc b/src/qarchiveextractor_p.cc
index da16962..4f618ab 100644
--- a/src/qarchiveextractor_p.cc
+++ b/src/qarchiveextractor_p.cc
@@ -106,7 +106,6 @@ static QJsonObject getArchiveEntryInformation(archive_entry *entry, bool bExclud
         roundedSize = 0;
     } else if(roundedSize < 1024) {
         sizeUnits = "Bytes";
-        roundedSize = roundedSize;
     } else if(roundedSize >= 1024 && roundedSize < 1048576) {
         sizeUnits = "KiB";
         roundedSize /= 1024;
diff --git a/tests/QArchiveTestCases.hpp b/tests/QArchiveTestCases.hpp
index 321332f..0f149a8 100644
--- a/tests/QArchiveTestCases.hpp
+++ b/tests/QArchiveTestCases.hpp
@@ -88,6 +88,7 @@ class QArchiveTestCases {
 	    TestCase8OutputDir,
 	    Test8OutputFile,
             TemporaryFilePath;
+  protected:
     const QString Test1OutputContents = "TEST1SUCCESS!";
     const QString Test2OutputContents = "TEST2SUCCESS!";
     const QString Test3Output1Contents = "TEST3SUCCESS1!";