mp4atom.h

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#ifndef TAG_PARSER_MP4ATOM_H
#define TAG_PARSER_MP4ATOM_H
 
#include "./mp4ids.h"
 
#include "../genericfileelement.h"
 
#include <c++utilities/conversion/stringconversion.h>
 
#include <cstdint>
#include <iostream>
#include <list>
#include <memory>
 
namespace TagParser {
 
class Mp4Atom;
class Mp4Container;
 
template <> class TAG_PARSER_EXPORT FileElementTraits<Mp4Atom> {
public:
    using ContainerType = Mp4Container;
    using IdentifierType = std::uint32_t;
    using DataSizeType = std::uint64_t;
 
    static constexpr std::uint8_t minimumElementSize()
    {
        return 8;
    }
};
 
class TAG_PARSER_EXPORT Mp4Atom : public GenericFileElement<Mp4Atom> {
    friend class GenericFileElement<Mp4Atom>;
 
public:
    Mp4Atom(ContainerType &container, std::uint64_t startOffset);
 
    std::string idToString() const;
    bool isParent() const;
    bool isPadding() const;
    std::uint64_t firstChildOffset() const;
 
    static void seekBackAndWriteAtomSize(std::ostream &stream, const std::ostream::pos_type &startOffset, Diagnostics &diag);
    static void seekBackAndWriteAtomSize64(std::ostream &stream, const std::ostream::pos_type &startOffset);
    static constexpr void addHeaderSize(std::uint64_t &dataSize);
    static void makeHeader(std::uint64_t size, std::uint32_t id, CppUtilities::BinaryWriter &writer);
 
protected:
    Mp4Atom(ContainerType &container, std::uint64_t startOffset, std::uint64_t maxSize);
    Mp4Atom(Mp4Atom &parent, std::uint64_t startOffset);
 
    void internalParse(Diagnostics &diag);
 
private:
    std::string parsingContext() const;
};
 
inline std::string Mp4Atom::idToString() const
{
    auto idString = CppUtilities::interpretIntegerAsString<IdentifierType>(id());
    for (char &c : idString) {
        if (c < ' ') {
            c = '?';
        }
    }
    return idString;
}
 
constexpr void Mp4Atom::addHeaderSize(std::uint64_t &dataSize)
{
    dataSize += (dataSize < 0xFFFFFFF7 ? 8 : 16);
}
 
} // namespace TagParser
 
#endif // TAG_PARSER_MP4ATOM_H