Don't clear field before parsing by default

generictagfield.h

@@ -221,7 +221,7 @@ template <class ImplementationType> inline void TagField<ImplementationType>::se
 }
 
 /*!
- * \brief Clears id, value, type info and sets default flag to false.
+ * \brief Clears id, value, type info, sets default flag to false and resets further implementation specific values.
  */
 template <class ImplementationType> void TagField<ImplementationType>::clear()
 {
@@ -230,7 +230,7 @@ template <class ImplementationType> void TagField<ImplementationType>::clear()
     m_typeInfo = TypeInfoType();
     m_typeInfoAssigned = false;
     m_default = true;
-    static_cast<ImplementationType *>(this)->cleared();
+    static_cast<ImplementationType *>(this)->reset();
 }
 
 /*!

id3/id3v2frame.cpp

@@ -111,7 +111,6 @@ template <class stringtype> int parseGenreIndex(const stringtype &denotation)
  */
 void Id3v2Frame::parse(BinaryReader &reader, uint32 version, uint32 maximalSize, Diagnostics &diag)
 {
-    clear();
     static const string defaultContext("parsing ID3v2 frame");
     string context;
 
@@ -335,9 +334,9 @@ void Id3v2Frame::make(BinaryWriter &writer, byte version, Diagnostics &diag)
 }
 
 /*!
- * \brief Ensures the field is cleared.
+ * \brief Resets ID3v2-specific values. Called via clear().
  */
-void Id3v2Frame::clear()
+void Id3v2Frame::reset()
 {
     m_flag = 0;
     m_group = 0;

id3/id3v2frame.h

@@ -138,10 +138,8 @@ public:
     static IdentifierType fieldIdFromString(const char *idString, std::size_t idStringSize = std::string::npos);
     static std::string fieldIdToString(IdentifierType id);
 
-protected:
-    void clear();
-
 private:
+    void reset();
     uint32 m_parsedVersion;
     uint32 m_dataSize;
     uint32 m_totalSize;

id3/id3v2tag.cpp

@@ -300,20 +300,17 @@ void Id3v2Tag::parse(istream &stream, const uint64 maximalSize, Diagnostics &dia
 
     // read frames
     auto pos = stream.tellg();
-    Id3v2Frame frame;
     while (bytesRemaining) {
         // seek to next frame
         stream.seekg(pos);
         // parse frame
+        Id3v2Frame frame;
         try {
             frame.parse(reader, majorVersion, bytesRemaining, diag);
-            if (frame.id()) {
-                // add frame if parsing was successfull
-                if (Id3v2FrameIds::isTextFrame(frame.id()) && fields().count(frame.id()) == 1) {
-                    diag.emplace_back(DiagLevel::Warning, "The text frame " % frame.frameIdString() + " exists more than once.", context);
-                }
-                fields().insert(make_pair(frame.id(), frame));
+            if (Id3v2FrameIds::isTextFrame(frame.id()) && fields().count(frame.id()) == 1) {
+                diag.emplace_back(DiagLevel::Warning, "The text frame " % frame.frameIdString() + " exists more than once.", context);
             }
+            fields().emplace(frame.id(), move(frame));
         } catch (const NoDataFoundException &) {
             if (frame.hasPaddingReached()) {
                 m_paddingSize = startOffset + m_size - pos;

matroska/matroskatag.cpp

@@ -115,18 +115,17 @@ void MatroskaTag::parse(EbmlElement &tagElement, Diagnostics &diag)
     static const string context("parsing Matroska tag");
     tagElement.parse(diag);
     m_size = tagElement.totalSize();
-    MatroskaTagField field;
     for (EbmlElement *child = tagElement.firstChild(); child; child = child->nextSibling()) {
         child->parse(diag);
         switch (child->id()) {
-        case MatroskaIds::SimpleTag: {
+        case MatroskaIds::SimpleTag:
             try {
+                MatroskaTagField field;
                 field.reparse(*child, diag, true);
-                fields().insert(make_pair(field.id(), field));
+                fields().emplace(field.id(), move(field));
             } catch (const Failure &) {
             }
             break;
-        }
         case MatroskaIds::Targets:
             parseTargets(*child, diag);
             break;

matroska/matroskatagfield.cpp

@@ -47,7 +47,6 @@ MatroskaTagField::MatroskaTagField(const string &id, const TagValue &value)
 void MatroskaTagField::reparse(EbmlElement &simpleTagElement, Diagnostics &diag, bool parseNestedFields)
 {
     string context("parsing Matroska tag field");
-    clear();
     simpleTagElement.parse(diag);
     bool tagDefaultFound = false;
     for (EbmlElement *child = simpleTagElement.firstChild(); child; child = child->nextSibling()) {

matroska/matroskatagfield.h

@@ -78,8 +78,8 @@ public:
     static typename std::string fieldIdFromString(const char *idString, std::size_t idStringSize = std::string::npos);
     static std::string fieldIdToString(const std::string &id);
 
-protected:
-    void cleared();
+private:
+    void reset();
 };
 
 /*!
@@ -117,9 +117,9 @@ inline std::string MatroskaTagField::fieldIdToString(const std::string &id)
 }
 
 /*!
- * \brief Ensures the field is cleared.
+ * \brief Resets Matroska-specific values. Called via clear().
  */
-inline void MatroskaTagField::cleared()
+inline void MatroskaTagField::reset()
 {
 }
 

mp4/mp4tag.cpp

@@ -352,12 +352,12 @@ void Mp4Tag::parse(Mp4Atom &metaAtom, Diagnostics &diag)
         diag.emplace_back(DiagLevel::Critical, "Unable to parse child atoms of meta atom (stores hdlr and ilst atoms).", context);
     }
     if (subAtom) {
-        Mp4TagField tagField;
         for (auto *child = subAtom->firstChild(); child; child = child->nextSibling()) {
+            Mp4TagField tagField;
             try {
                 child->parse(diag);
                 tagField.reparse(*child, diag);
-                fields().emplace(child->id(), tagField);
+                fields().emplace(child->id(), move(tagField));
             } catch (const Failure &) {
             }
         }

mp4/mp4tagfield.cpp

@@ -77,7 +77,6 @@ void Mp4TagField::reparse(Mp4Atom &ilstChild, Diagnostics &diag)
     using namespace Mp4AtomIds;
     using namespace Mp4TagAtomIds;
     string context("parsing MP4 tag field");
-    clear(); // clear old values
     ilstChild.parse(diag); // ensure child has been parsed
     setId(ilstChild.id());
     context = "parsing MP4 tag field " + ilstChild.idToString();
@@ -425,9 +424,9 @@ uint32 Mp4TagField::appropriateRawDataType() const
 }
 
 /*!
- * \brief Ensures the field is cleared.
+ * \brief Resets MP4-specific values. Called via clear().
  */
-void Mp4TagField::cleared()
+void Mp4TagField::reset()
 {
     m_name.clear();
     m_mean.clear();

mp4/mp4tagfield.h

@@ -121,10 +121,8 @@ public:
     static IdentifierType fieldIdFromString(const char *idString, std::size_t idStringSize = std::string::npos);
     static std::string fieldIdToString(IdentifierType id);
 
-protected:
-    void cleared();
-
 private:
+    void reset();
     std::string m_name;
     std::string m_mean;
     uint32 m_parsedRawDataType;

vorbis/vorbiscomment.cpp

@@ -144,13 +144,12 @@ template <class StreamType> void VorbisComment::internalParse(StreamType &stream
             CHECK_MAX_SIZE(4);
             stream.read(sig, 4);
             uint32 fieldCount = LE::toUInt32(sig);
-            VorbisCommentField field;
-            const string &fieldId = field.id();
             for (uint32 i = 0; i < fieldCount; ++i) {
                 // read fields
+                VorbisCommentField field;
                 try {
                     field.parse(stream, maxSize, diag);
-                    fields().emplace(fieldId, field);
+                    fields().emplace(field.id(), move(field));
                 } catch (const TruncatedDataException &) {
                     throw;
                 } catch (const Failure &) {

vorbis/vorbiscommentfield.h

@@ -61,10 +61,8 @@ public:
     static typename std::string fieldIdFromString(const char *idString, std::size_t idStringSize = std::string::npos);
     static std::string fieldIdToString(const std::string &id);
 
-protected:
-    void cleared();
-
 private:
+    void reset();
     template <class StreamType> void internalParse(StreamType &stream, uint64 &maxSize, Diagnostics &diag);
 };
 
@@ -103,9 +101,9 @@ inline std::string VorbisCommentField::fieldIdToString(const std::string &id)
 }
 
 /*!
- * \brief Ensures the field is cleared.
+ * \brief Resets Vorbis Comment-specific values. Called via clear().
  */
-inline void VorbisCommentField::cleared()
+inline void VorbisCommentField::reset()
 {
 }