This class models a TIFF sub-directory (sub-IFD). A sub-IFD is an entry with one or more values that are pointers to IFD structures containing an IFD. The TIFF standard defines some important tags to be sub-IFDs, including the Exif and GPS tags. More...

#include <tiffcomposite_int.hpp>

Inheritance diagram for Exiv2::Internal::TiffSubIfd:

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Public Member Functions
Creators
	TiffSubIfd (uint16_t tag, IfdId group, IfdId newGroup)
	Default constructor.
	~TiffSubIfd () override=default
	Virtual destructor.
Protected Creators
	TiffSubIfd (const TiffSubIfd &rhs)
	Copy constructor (used to implement clone()).
TiffSubIfd &	operator= (const TiffSubIfd &)=delete
Public Member Functions inherited from Exiv2::Internal::TiffEntryBase
constexpr	TiffEntryBase (uint16_t tag, IfdId group, TiffType tiffType=ttUndefined)
	Default constructor.
	~TiffEntryBase () override=default
	Virtual destructor.
TiffEntryBase &	operator= (const TiffEntryBase &)=delete
	Assignment operator.
void	encode (TiffEncoder &encoder, const Exifdatum *datum)
	Encode a TIFF component from the metadatum provided and information from the encoder as needed.
void	setOffset (size_t offset)
	Set the offset.
void	setData (byte *pData, size_t size, std::shared_ptr< DataBuf > storage)
	Set pointer and size of the entry's data (not taking ownership of the data).
void	setData (std::shared_ptr< DataBuf > buf)
	Set the entry's data buffer. A shared_ptr is used to manage the DataBuf because TiffEntryBase has a clone method so it is possible (in theory) for the DataBuf to have multiple owners.
void	updateValue (Value::UniquePtr value, ByteOrder byteOrder)
	Update the value. Takes ownership of the pointer passed in.
void	setValue (Value::UniquePtr value)
	Set tag value. Takes ownership of the pointer passed in.
TiffType	tiffType () const
	Return the TIFF type.
size_t	offset () const
	Return the offset to the data area relative to the base for the component (usually the start of the TIFF header)
int	idx () const override
	Return the unique id of the entry in the image.
const byte *	pData () const
	Return a pointer to the binary representation of the value of this component.
const Value *	pValue () const
	Return a const pointer to the converted value of this component.
Public Member Functions inherited from Exiv2::Internal::TiffComponent
constexpr	TiffComponent (uint16_t tag, IfdId group)
	Constructor.
virtual	~TiffComponent ()=default
	Virtual destructor.
	TiffComponent (const TiffComponent &)=default
TiffComponent &	operator= (const TiffComponent &)=default
TiffComponent *	addPath (uint16_t tag, TiffPath &tiffPath, TiffComponent *pRoot, UniquePtr object=nullptr)
	Add a TIFF entry tag to the component. Components on the path to the entry are added if they don't exist yet.
TiffComponent *	addChild (UniquePtr tiffComponent)
	Add a child to the component. Default is to do nothing.
TiffComponent *	addNext (UniquePtr tiffComponent)
	Add a "next" component to the component. Default is to do nothing.
void	accept (TiffVisitor &visitor)
	Interface to accept visitors (Visitor pattern). Visitors can perform operations on all components of the composite.
void	setStart (const byte *pStart)
	Set a pointer to the start of the binary representation of the component in a memory buffer. The buffer must be allocated and freed outside of this class.
size_t	write (IoWrapper &ioWrapper, ByteOrder byteOrder, size_t offset, size_t valueIdx, size_t dataIdx, size_t &imageIdx)
	Write a TiffComponent to a binary image.
uint16_t	tag () const
	Return the tag of this entry.
IfdId	group () const
	Return the group id of this component.
byte *	start () const
	Return a pointer to the start of the binary representation of the component.
UniquePtr	clone () const
	Return an auto-pointer to a copy of itself (deep copy, but without any children). The caller owns this copy and the auto-pointer ensures that it will be deleted.
size_t	writeData (IoWrapper &ioWrapper, ByteOrder byteOrder, size_t offset, size_t dataIdx, size_t &imageIdx) const
	Write the IFD data of this component to a binary image. Return the number of bytes written. Components derived from TiffEntryBase implement this method if needed.
size_t	writeImage (IoWrapper &ioWrapper, ByteOrder byteOrder) const
	Write the image data of this component to a binary image. Return the number of bytes written. TIFF components implement this method if needed.
size_t	size () const
	Return the size in bytes of the IFD value of this component when written to a binary image.
size_t	count () const
	Return the number of components in this component.
size_t	sizeData () const
	Return the size in bytes of the IFD data of this component when written to a binary image. This is a support function for write(). Components derived from TiffEntryBase implement this method corresponding to their implementation of writeData().
size_t	sizeImage () const
	Return the size in bytes of the image data of this component when written to a binary image. This is a support function for write(). TIFF components implement this method corresponding to their implementation of writeImage().

Protected Member Functions
Protected Manipulators
TiffComponent *	doAddPath (uint16_t tag, TiffPath &tiffPath, TiffComponent *pRoot, TiffComponent::UniquePtr object) override
	Implements addPath(). The default implementation does nothing.
TiffComponent *	doAddChild (TiffComponent::UniquePtr tiffComponent) override
	Implements addChild(). The default implementation does nothing.
void	doAccept (TiffVisitor &visitor) override
	Implements accept().
void	doEncode (TiffEncoder &encoder, const Exifdatum *datum) override
	Implements encode().
size_t	doWrite (IoWrapper &ioWrapper, ByteOrder byteOrder, size_t offset, size_t valueIdx, size_t dataIdx, size_t &imageIdx) override
	Implements write(). Write the sub-IFD pointers to the ioWrapper, return the number of bytes written. The valueIdx and imageIdx arguments are not used.
Protected Member Functions inherited from Exiv2::Internal::TiffEntryBase
	TiffEntryBase (const TiffEntryBase &rhs)
	Copy constructor (used to implement clone()).
void	setCount (size_t count)
	Set the number of components in this entry.
void	setIdx (int idx)
	Set the unique id of the entry in the image.
size_t	doCount () const override
	Implements count().
std::shared_ptr< DataBuf >	storage () const
	Used (internally) to create another reference to the DataBuf reference by storage_.
Protected Member Functions inherited from Exiv2::Internal::TiffComponent
virtual TiffComponent *	doAddNext (UniquePtr tiffComponent)
	Implements addNext(). The default implementation does nothing.

Friends
class	TiffReader

Protected Accessors
TiffSubIfd *	doClone () const override
	Internal virtual copy constructor, implements clone().
size_t	doWriteData (IoWrapper &ioWrapper, ByteOrder byteOrder, size_t offset, size_t dataIdx, size_t &imageIdx) const override
	Implements writeData(). Write the sub-IFDs to the ioWrapper. Return the number of bytes written.
size_t	doWriteImage (IoWrapper &ioWrapper, ByteOrder byteOrder) const override
	Implements writeImage(). Write the image data of each sub-IFD to the ioWrapper. Return the number of bytes written.
size_t	doSize () const override
	Implements size(). Return the size of the sub-Ifd pointers.
size_t	doSizeData () const override
	Implements sizeData(). Return the sum of the sizes of all sub-IFDs.
size_t	doSizeImage () const override
	Implements sizeImage(). Return the sum of the image sizes of all sub-IFDs.

Additional Inherited Members
Public Types inherited from Exiv2::Internal::TiffComponent
using	UniquePtr = std::unique_ptr<TiffComponent>
	TiffComponent auto_ptr type.
using	Components = std::vector<UniquePtr>
	Container type to hold all metadata.
static size_t	writeOffset (byte *buf, size_t offset, TiffType tiffType, ByteOrder byteOrder)
	Helper function to write an offset to a preallocated binary buffer.

Detailed Description

This class models a TIFF sub-directory (sub-IFD). A sub-IFD is an entry with one or more values that are pointers to IFD structures containing an IFD. The TIFF standard defines some important tags to be sub-IFDs, including the Exif and GPS tags.

Member Function Documentation

◆ doAccept()

void Exiv2::Internal::TiffSubIfd::doAccept ( TiffVisitor & visitor )

overrideprotectedvirtual

Implements accept().

Implements Exiv2::Internal::TiffComponent.

References Exiv2::Internal::TiffVisitor::geTraverse, Exiv2::Internal::TiffVisitor::go(), and Exiv2::Internal::TiffVisitor::visitSubIfd().

◆ doAddChild()

TiffComponent * Exiv2::Internal::TiffSubIfd::doAddChild ( TiffComponent::UniquePtr tiffComponent )

overrideprotectedvirtual

Implements addChild(). The default implementation does nothing.

Reimplemented from Exiv2::Internal::TiffComponent.

◆ doAddPath()

TiffComponent * Exiv2::Internal::TiffSubIfd::doAddPath	(	uint16_t	tag,
		TiffPath &	tiffPath,
		TiffComponent *	pRoot,
		TiffComponent::UniquePtr	object )

overrideprotectedvirtual

Implements addPath(). The default implementation does nothing.

Reimplemented from Exiv2::Internal::TiffComponent.

References Exiv2::Internal::TiffComponent::addChild(), Exiv2::Internal::TiffPathItem::group(), Exiv2::Internal::TiffEntryBase::setCount(), Exiv2::Internal::TiffComponent::tag(), and Exiv2::Internal::TiffPathItem::tag().

◆ doClone()

TiffSubIfd * Exiv2::Internal::TiffSubIfd::doClone ( ) const

nodiscardoverrideprotectedvirtual

Internal virtual copy constructor, implements clone().

Implements Exiv2::Internal::TiffComponent.

References TiffSubIfd().

◆ doEncode()

void Exiv2::Internal::TiffSubIfd::doEncode	(	TiffEncoder &	encoder,
		const Exifdatum *	datum )

overrideprotectedvirtual

Implements encode().

Implements Exiv2::Internal::TiffEntryBase.

References Exiv2::Internal::TiffEncoder::encodeSubIfd().

◆ doSize()

size_t Exiv2::Internal::TiffSubIfd::doSize ( ) const

nodiscardoverrideprotectedvirtual

Implements size(). Return the size of the sub-Ifd pointers.

Reimplemented from Exiv2::Internal::TiffEntryBase.

◆ doSizeData()

size_t Exiv2::Internal::TiffSubIfd::doSizeData ( ) const

nodiscardoverrideprotectedvirtual

Implements sizeData(). Return the sum of the sizes of all sub-IFDs.

Reimplemented from Exiv2::Internal::TiffEntryBase.

◆ doSizeImage()

size_t Exiv2::Internal::TiffSubIfd::doSizeImage ( ) const

nodiscardoverrideprotectedvirtual

Implements sizeImage(). Return the sum of the image sizes of all sub-IFDs.

Reimplemented from Exiv2::Internal::TiffEntryBase.

◆ doWrite()

size_t Exiv2::Internal::TiffSubIfd::doWrite	(	IoWrapper &	ioWrapper,
		ByteOrder	byteOrder,
		size_t	offset,
		size_t	valueIdx,
		size_t	dataIdx,
		size_t &	imageIdx )

overrideprotectedvirtual

Implements write(). Write the sub-IFD pointers to the ioWrapper, return the number of bytes written. The valueIdx and imageIdx arguments are not used.

Reimplemented from Exiv2::Internal::TiffEntryBase.

References Exiv2::DataBuf::c_data(), Exiv2::Internal::cmpGroupLt(), Exiv2::DataBuf::data(), Exiv2::Internal::TiffEntryBase::idx(), Exiv2::Internal::TiffEntryBase::offset(), Exiv2::Internal::TiffEntryBase::tiffType(), Exiv2::Internal::IoWrapper::write(), and Exiv2::Internal::TiffEntryBase::writeOffset().