135 lines
3.5 KiB
C++
135 lines
3.5 KiB
C++
#ifndef TAG_PARSER_MATROSKATAG_H
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#define TAG_PARSER_MATROSKATAG_H
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#include "./matroskatagfield.h"
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#include "./matroskatagid.h"
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#include "../fieldbasedtag.h"
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namespace TagParser {
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class EbmlElement;
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class MatroskaTag;
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class TAG_PARSER_EXPORT MatroskaTagMaker {
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friend class MatroskaTag;
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public:
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void make(std::ostream &stream) const;
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const MatroskaTag &tag() const;
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uint64 requiredSize() const;
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private:
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MatroskaTagMaker(MatroskaTag &tag, Diagnostics &diag);
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MatroskaTag &m_tag;
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uint64 m_targetsSize;
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uint64 m_simpleTagsSize;
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std::vector<MatroskaTagFieldMaker> m_maker;
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uint64 m_tagSize;
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uint64 m_totalSize;
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};
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/*!
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* \brief Returns the associated tag.
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*/
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inline const MatroskaTag &MatroskaTagMaker::tag() const
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{
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return m_tag;
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}
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/*!
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* \brief Returns the number of bytes which will be written when making the tag.
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*/
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inline uint64 MatroskaTagMaker::requiredSize() const
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{
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return m_totalSize;
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}
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/*!
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* \brief Defines traits for the TagField implementation of the MatroskaTag class.
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*/
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template <> class TAG_PARSER_EXPORT FieldMapBasedTagTraits<MatroskaTag> {
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public:
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typedef MatroskaTagField FieldType;
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typedef std::less<typename FieldType::IdentifierType> Compare;
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};
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class TAG_PARSER_EXPORT MatroskaTag : public FieldMapBasedTag<MatroskaTag> {
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friend class FieldMapBasedTag<MatroskaTag>;
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public:
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MatroskaTag();
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static constexpr TagType tagType = TagType::MatroskaTag;
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static constexpr const char *tagName = "Matroska tag";
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static constexpr TagTextEncoding defaultTextEncoding = TagTextEncoding::Utf8;
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bool canEncodingBeUsed(TagTextEncoding encoding) const;
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bool supportsTarget() const;
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TagTargetLevel targetLevel() const;
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void parse(EbmlElement &tagElement, Diagnostics &diag);
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MatroskaTagMaker prepareMaking(Diagnostics &diag);
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void make(std::ostream &stream, Diagnostics &diag);
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protected:
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IdentifierType internallyGetFieldId(KnownField field) const;
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KnownField internallyGetKnownField(const IdentifierType &id) const;
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private:
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void parseTargets(EbmlElement &targetsElement, Diagnostics &diag);
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};
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/*!
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* \brief Constructs a new tag.
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*/
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inline MatroskaTag::MatroskaTag()
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{
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}
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inline bool MatroskaTag::supportsTarget() const
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{
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return true;
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}
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inline TagTargetLevel MatroskaTag::targetLevel() const
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{
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return matroskaTagTargetLevel(m_target.level());
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}
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/*!
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* \brief Prepares making.
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* \returns Returns a MatroskaTagMaker object which can be used to actually make the tag.
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* \remarks The tag must NOT be mutated after making is prepared when it is intended to actually
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* make the tag using the make() method of the returned object.
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* \throws Throws TagParser::Failure or a derived exception when a making error occurs.
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*
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* This method might be useful when it is necessary to know the size of the tag before making it.
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* \sa make()
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*/
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inline MatroskaTagMaker MatroskaTag::prepareMaking(Diagnostics &diag)
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{
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return MatroskaTagMaker(*this, diag);
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}
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/*!
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* \brief Writes tag information to the specified \a stream (makes a "Tag"-element).
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* \throws Throws std::ios_base::failure when an IO error occurs.
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* \throws Throws TagParser::Failure or a derived exception when a making
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* error occurs.
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* \sa prepareMaking()
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*/
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inline void MatroskaTag::make(std::ostream &stream, Diagnostics &diag)
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{
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prepareMaking(diag).make(stream);
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}
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inline bool MatroskaTag::canEncodingBeUsed(TagTextEncoding encoding) const
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{
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return encoding == TagTextEncoding::Utf8;
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}
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} // namespace TagParser
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#endif // TAG_PARSER_MATROSKATAG_H
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