Exiv2::Internal::TiffReader Class Reference

TIFF composite visitor to read the TIFF structure from a block of memory and build the composite from it (Visitor pattern). Used by TiffParser to read the TIFF data from a block of memory. More...

#include <tiffvisitor_int.hpp>

Inheritance diagram for Exiv2::Internal::TiffReader:

Public Member Functions
Creators
	TiffReader (const byte *pData, size_t size, TiffComponent *pRoot, TiffRwState state)
	Constructor. The data buffer and table describing the TIFF structure of the data are set in the constructor.
	TiffReader (const TiffReader &)=delete
TiffReader &	operator= (const TiffReader &)=delete
	~TiffReader () override=default
	Virtual destructor.
Manipulators
void	visitEntry (TiffEntry *object) override
	Read a TIFF entry from the data buffer.
void	visitDataEntry (TiffDataEntry *object) override
	Read a TIFF data entry from the data buffer.
void	visitImageEntry (TiffImageEntry *object) override
	Read a TIFF image entry from the data buffer.
void	visitSizeEntry (TiffSizeEntry *object) override
	Read a TIFF size entry from the data buffer.
void	visitDirectory (TiffDirectory *object) override
	Read a TIFF directory from the data buffer.
void	visitSubIfd (TiffSubIfd *object) override
	Read a TIFF sub-IFD from the data buffer.
void	visitMnEntry (TiffMnEntry *object) override
	Read a TIFF makernote entry from the data buffer.
void	visitIfdMakernote (TiffIfdMakernote *object) override
	Read an IFD makernote from the data buffer.
void	visitIfdMakernoteEnd (TiffIfdMakernote *object) override
	Reset reader to its original state, undo makernote specific settings.
void	visitBinaryArray (TiffBinaryArray *object) override
	Read a binary array from the data buffer.
void	visitBinaryElement (TiffBinaryElement *object) override
	Read an element of a binary array from the data buffer.
void	readTiffEntry (TiffEntryBase *object)
	Read a standard TIFF entry from the data buffer.
void	readDataEntryBase (TiffDataEntryBase *object)
	Read a TiffDataEntryBase from the data buffer.
void	setMnState (const TiffRwState *state=nullptr)
	Set the state of the reader to one suitable for the Makernote.
void	setOrigState ()
	Set the state to the original state as set in the constructor.
bool	circularReference (const byte *start, IfdId group)
	Check IFD directory pointer start for circular reference.
int	nextIdx (IfdId group)
	Return the next idx sequence number for group.
void	postProcess ()
	Read deferred components.
Public Member Functions inherited from Exiv2::Internal::TiffVisitor
virtual	~TiffVisitor ()=default
	Virtual destructor.
void	setGo (GoEvent event, bool go)
	Set the stop/go flag: true for go, false for stop.
virtual void	visitDirectoryNext (TiffDirectory *object)
	Operation to perform for a TIFF directory, after all components and before the next entry is processed.
virtual void	visitDirectoryEnd (TiffDirectory *object)
	Operation to perform for a TIFF directory, at the end of the processing.
virtual void	visitBinaryArrayEnd (TiffBinaryArray *object)
	Operation to perform for a TIFF binary array, at the end of the processing.
bool	go (GoEvent event) const
	Check if stop flag for event is clear, return true if it's clear.

Accessors
ByteOrder	byteOrder () const
	Return the byte order.
size_t	baseOffset () const
	Return the base offset. See class TiffRwState for details.

Additional Inherited Members
Public Types inherited from Exiv2::Internal::TiffVisitor
enum	GoEvent { geTraverse = 0 , geKnownMakernote = 1 }
	Events for the stop/go flag. See setGo(). More...

Detailed Description

TIFF composite visitor to read the TIFF structure from a block of memory and build the composite from it (Visitor pattern). Used by TiffParser to read the TIFF data from a block of memory.

Constructor & Destructor Documentation

TiffReader()

Exiv2::Internal::TiffReader::TiffReader	(	const byte *	pData,
		size_t	size,
		TiffComponent *	pRoot,
		TiffRwState	state
	)

Constructor. The data buffer and table describing the TIFF structure of the data are set in the constructor.

Parameters

pData	Pointer to the data buffer, starting with a TIFF header.
size	Number of bytes in the data buffer.
pRoot	Root element of the TIFF composite.
state	State object for creation function, byte order and base offset.

Member Function Documentation

postProcess()

void Exiv2::Internal::TiffReader::postProcess

(

)

Read deferred components.

This function is called after the TIFF composite is read by passing a TiffReader to the accept() function of the root component. It reads all components for which reading was deferred during that pass. This is usually done to make sure that all other components are accessible at the time the deferred components are processed.

References setMnState(), and setOrigState().

setMnState()

void Exiv2::Internal::TiffReader::setMnState

(

const TiffRwState *

state = nullptr

)

Set the state of the reader to one suitable for the Makernote.

Uses the state passed in, if any, and remembers it for use during subsequent calls without any argument.

References Exiv2::Internal::TiffRwState::baseOffset(), and Exiv2::Internal::TiffRwState::byteOrder().

Referenced by postProcess(), and visitIfdMakernote().

visitBinaryArray()

void Exiv2::Internal::TiffReader::visitBinaryArray ( TiffBinaryArray *  object )

overridevirtual

Read a binary array from the data buffer.

Implements Exiv2::Internal::TiffVisitor.

References Exiv2::Internal::TiffComponent::accept(), Exiv2::Internal::ArrayCfg::concat_, Exiv2::Internal::ArrayDef::count_, Exiv2::Internal::ArrayCfg::cryptFct_, Exiv2::Internal::ArrayCfg::elDefaultDef_, EXV_WARNING, Exiv2::Internal::TiffComponent::group(), Exiv2::Internal::groupName(), Exiv2::Internal::TiffEntryBase::idx(), Exiv2::Internal::ArrayDef::idx_, Exiv2::Internal::TiffBinaryArray::initialize(), readTiffEntry(), Exiv2::Internal::TiffFinder::result(), Exiv2::Internal::TiffComponent::tag(), Exiv2::Internal::ArrayCfg::tagStep(), Exiv2::Internal::ArrayDef::tiffType_, and Exiv2::Internal::ttUndefined.

visitBinaryElement()

void Exiv2::Internal::TiffReader::visitBinaryElement ( TiffBinaryElement *  object )

overridevirtual

Read an element of a binary array from the data buffer.

Implements Exiv2::Internal::TiffVisitor.

References byteOrder(), Exiv2::Value::create(), Exiv2::Internal::TiffBinaryElement::elDef(), Exiv2::Internal::enforce(), Exiv2::Internal::TiffComponent::group(), nextIdx(), Exiv2::Internal::TiffComponent::tag(), Exiv2::Internal::ArrayDef::tiffType_, and Exiv2::Internal::toTypeId().

visitDataEntry()

void Exiv2::Internal::TiffReader::visitDataEntry ( TiffDataEntry *  object )

overridevirtual

Read a TIFF data entry from the data buffer.

Implements Exiv2::Internal::TiffVisitor.

References readDataEntryBase().

visitDirectory()

void Exiv2::Internal::TiffReader::visitDirectory ( TiffDirectory *  object )

overridevirtual

Read a TIFF directory from the data buffer.

Implements Exiv2::Internal::TiffVisitor.

References baseOffset(), byteOrder(), circularReference(), Exiv2::Internal::TiffCreator::create(), EXV_ERROR, EXV_WARNING, Exiv2::getULong(), Exiv2::getUShort(), Exiv2::Internal::TiffComponent::group(), Exiv2::Internal::groupName(), Exiv2::Internal::TiffDirectory::hasNext(), Exiv2::Internal::Tag::next, and Exiv2::Internal::TiffComponent::start().

visitEntry()

void Exiv2::Internal::TiffReader::visitEntry ( TiffEntry *  object )

overridevirtual

Read a TIFF entry from the data buffer.

Implements Exiv2::Internal::TiffVisitor.

References readTiffEntry().

visitIfdMakernote()

void Exiv2::Internal::TiffReader::visitIfdMakernote ( TiffIfdMakernote *  object )

overridevirtual

Read an IFD makernote from the data buffer.

Implements Exiv2::Internal::TiffVisitor.

References Exiv2::Internal::TiffRwState::byteOrder(), byteOrder(), EXV_ERROR, Exiv2::Internal::TiffVisitor::geKnownMakernote, Exiv2::Internal::TiffComponent::group(), Exiv2::Internal::groupName(), Exiv2::hexdump(), Exiv2::Internal::TiffIfdMakernote::ifdOffset(), Exiv2::Internal::TiffIfdMakernote::readHeader(), Exiv2::Internal::TiffVisitor::setGo(), setMnState(), and Exiv2::Internal::TiffComponent::start().

visitIfdMakernoteEnd()

void Exiv2::Internal::TiffReader::visitIfdMakernoteEnd ( TiffIfdMakernote *  object )

overridevirtual

Reset reader to its original state, undo makernote specific settings.

Reimplemented from Exiv2::Internal::TiffVisitor.

References setOrigState().

visitImageEntry()

void Exiv2::Internal::TiffReader::visitImageEntry ( TiffImageEntry *  object )

overridevirtual

Read a TIFF image entry from the data buffer.

Implements Exiv2::Internal::TiffVisitor.

References readDataEntryBase().

visitMnEntry()

void Exiv2::Internal::TiffReader::visitMnEntry ( TiffMnEntry *  object )

overridevirtual

Read a TIFF makernote entry from the data buffer.

Implements Exiv2::Internal::TiffVisitor.

References Exiv2::Internal::TiffComponent::accept(), byteOrder(), Exiv2::Internal::TiffMnCreator::create(), Exiv2::make(), Exiv2::Internal::TiffEntryBase::pData(), Exiv2::Internal::TiffEntryBase::pValue(), readTiffEntry(), Exiv2::Internal::TiffFinder::result(), Exiv2::Internal::TiffComponent::tag(), and Exiv2::Value::toString().

visitSizeEntry()

void Exiv2::Internal::TiffReader::visitSizeEntry ( TiffSizeEntry *  object )

overridevirtual

Read a TIFF size entry from the data buffer.

Implements Exiv2::Internal::TiffVisitor.

References Exiv2::Internal::TiffComponent::accept(), baseOffset(), Exiv2::Internal::TiffSizeEntry::dtGroup(), Exiv2::Internal::TiffSizeEntry::dtTag(), Exiv2::Internal::TiffEntryBase::pValue(), readTiffEntry(), Exiv2::Internal::TiffFinder::result(), and Exiv2::Internal::TiffDataEntryBase::setStrips().

visitSubIfd()

void Exiv2::Internal::TiffReader::visitSubIfd ( TiffSubIfd *  object )

overridevirtual

Read a TIFF sub-IFD from the data buffer.

Implements Exiv2::Internal::TiffVisitor.

References baseOffset(), byteOrder(), Exiv2::Internal::TiffComponent::count(), EXV_ERROR, EXV_WARNING, Exiv2::getULong(), Exiv2::Internal::TiffComponent::group(), Exiv2::Internal::groupName(), Exiv2::Internal::TiffEntryBase::pData(), readTiffEntry(), Exiv2::Internal::TiffComponent::tag(), Exiv2::Internal::TiffEntryBase::tiffType(), Exiv2::Internal::ttSignedLong, Exiv2::Internal::ttTiffIfd, and Exiv2::Internal::ttUnsignedLong.

---

The documentation for this class was generated from the following files:

• tiffvisitor_int.hpp
• tiffvisitor_int.cpp