Provides classes and functions to encode and decode Exif and Iptc data. This namespace corresponds to the libexiv2 library. More...

Classes
class	Exiv2::CanonMakerNote
	MakerNote for Canon cameras. More...
struct	Exiv2::CanonMakerNote::RegisterMakerNote
	Structure used to auto-register the MakerNote.
struct	Exiv2::RecordInfo
	Contains information about one record. More...
struct	Exiv2::DataSet
	Dataset information. More...
class	Exiv2::IptcDataSets
	Container for Iptc dataset information. Implemented as a static class. More...
class	Exiv2::Error
	Very simple error class used for exceptions. It contains just an error message. An output operator is provided to print errors to a stream. More...
class	Exiv2::ExifKey
	Concrete keys for Exif metadata. More...
class	Exiv2::Exifdatum
	Information related to one Exif tag. More...
class	Exiv2::Thumbnail
	Exif Thumbnail image. This abstract base class provides the interface for the thumbnail image that is optionally embedded in the Exif data. More...
class	Exiv2::TiffThumbnail
	Exif thumbnail image in TIFF format. More...
class	Exiv2::JpegThumbnail
	Exif thumbnail image in JPEG format. More...
class	Exiv2::FindMetadatumByIfdIdIdx
	Unary predicate that matches a Exifdatum with a given ifd id and idx. More...
class	Exiv2::ExifData
	A container for Exif data. This is a top-level class of the Exiv2 library. More...
class	Exiv2::FujiMakerNote
	MakerNote for Fujifilm cameras. More...
struct	Exiv2::FujiMakerNote::RegisterMakerNote
	Structure used to auto-register the MakerNote.
class	Exiv2::Entry
	Data structure for one IFD directory entry. See the description of class Ifd for an explanation of the supported modes for memory allocation. More...
class	Exiv2::FindEntryByIdx
	Unary predicate that matches an Entry with a given index. More...
class	Exiv2::FindEntryByTag
	Unary predicate that matches an Entry with a given tag. More...
class	Exiv2::Ifd
	Models an IFD (Image File Directory). More...
struct	Exiv2::Ifd::PreEntry
	Helper structure to build IFD entries.
class	Exiv2::Image
	Abstract base class defining the interface for an image. More...
class	Exiv2::ImageFactory
	Image factory. More...
struct	Exiv2::ImageFactory::ImageFcts
	Struct for storing image function pointers.
class	Exiv2::JpegBase
	Abstract helper base class to access JPEG images. More...
class	Exiv2::JpegImage
	Helper class to access JPEG images. More...
class	Exiv2::ExvImage
	Helper class to access Exiv2 files. More...
class	Exiv2::TiffHeader
	Helper class modelling the TIFF header structure. More...
class	Exiv2::IptcKey
	Concrete keys for Iptc metadata. More...
class	Exiv2::Iptcdatum
	Information related to one Iptc dataset. More...
class	Exiv2::FindMetadatumById
	Unary predicate that matches an Iptcdatum with given record and dataset. More...
class	Exiv2::IptcData
	A container for Iptc data. This is a top-level class of the Exiv2 library. More...
class	Exiv2::MakerNote
	Exif makernote interface. More...
struct	Exiv2::MakerNote::MnTagInfo
	MakerNote Tag information. More...
class	Exiv2::IfdMakerNote
	Interface for MakerNotes in IFD format. See MakerNote. More...
class	Exiv2::MakerNoteFactory
	Factory for MakerNote objects. More...
class	Exiv2::Key
	Abstract base class defining the Key of a metadatum. Keys are used to identify and group metadata. More...
class	Exiv2::Metadatum
	Abstract base class defining the interface to access information related to one metadata tag. More...
class	Exiv2::FindMetadatumByKey
	Unary predicate that matches a Exifdatum with a given key. More...
class	Exiv2::Nikon1MakerNote
	A MakerNote format used by Nikon cameras, such as the E990 and D1. More...
struct	Exiv2::Nikon1MakerNote::RegisterMakerNote
	Structure used to auto-register the MakerNote.
class	Exiv2::Nikon2MakerNote
	A second MakerNote format used by Nikon cameras, including the E700, E800, E900, E900S, E910, E950. More...
class	Exiv2::Nikon3MakerNote
	A third MakerNote format used by Nikon cameras, e.g., E5400, SQ, D2H, D70. More...
class	Exiv2::SigmaMakerNote
	MakerNote for Sigma (Foveon) cameras. More...
struct	Exiv2::SigmaMakerNote::RegisterMakerNote
	Structure used to auto-register the MakerNote.
struct	Exiv2::IfdInfo
	Contains information pertaining to one IFD. More...
struct	Exiv2::SectionInfo
	Contains information pertaining to one section. More...
struct	Exiv2::TagInfo
	Tag information. More...
class	Exiv2::ExifTags
	Container for Exif tag information. Implemented as a static class. More...
struct	Exiv2::TypeInfoTable
	Information pertaining to the defined types. More...
class	Exiv2::TypeInfo
	Type information lookup functions. Implemented as a static class. More...
class	Exiv2::DataBuf
	Utility class containing a character array. All it does is to take care of memory allocation and deletion. Its primary use is meant to be as a stack variable in functions that need a temporary data buffer. Todo: this should be some sort of smart pointer, essentially an std:auto_ptr for a character array. But it isn't. More...
class	Exiv2::Value
	Common interface for all types of values used with metadata. More...
class	Exiv2::DataValue
	Value for an undefined data type. More...
class	Exiv2::StringValueBase
	Abstract base class for a string based Value type. More...
class	Exiv2::StringValue
	Value for string type. More...
class	Exiv2::AsciiValue
	Value for an Ascii string type. More...
class	Exiv2::DateValue
	Value for simple ISO 8601 dates More...
struct	Exiv2::DateValue::Date
	Simple Date helper structure. More...
class	Exiv2::TimeValue
	Value for simple ISO 8601 times. More...
struct	Exiv2::TimeValue::Time
	Simple Time helper structure. More...
class	Exiv2::ValueType< T >
	Template for a Value of a basic type. This is used for unsigned and signed short, long and rationals. More...
Functions printing interpreted tag values
std::ostream &	printValue (std::ostream &os, const Value &value)
	Default print function, using the Value output operator.
std::ostream &	printLong (std::ostream &os, const Value &value)
	Print the value converted to a long.
std::ostream &	printFloat (std::ostream &os, const Value &value)
	Print a Rational or URational value in floating point format.
std::ostream &	printUnit (std::ostream &os, const Value &value)
	Print the unit for measuring X and Y resolution.
std::ostream &	print0x0103 (std::ostream &os, const Value &value)
	Print the compression scheme used for the image data.
std::ostream &	print0x0106 (std::ostream &os, const Value &value)
	Print the pixel composition.
std::ostream &	print0x0112 (std::ostream &os, const Value &value)
	Print the orientation.
std::ostream &	print0x0213 (std::ostream &os, const Value &value)
	Print the YCbCrPositioning.
std::ostream &	print0x8298 (std::ostream &os, const Value &value)
	Print the Copyright.
std::ostream &	print0x829a (std::ostream &os, const Value &value)
	Print the Exposure time.
std::ostream &	print0x829d (std::ostream &os, const Value &value)
	Print the F number.
std::ostream &	print0x8822 (std::ostream &os, const Value &value)
	Print the Exposure mode.
std::ostream &	print0x8827 (std::ostream &os, const Value &value)
	Print ISO speed ratings.
std::ostream &	print0x9101 (std::ostream &os, const Value &value)
	Print components configuration specific to compressed data.
std::ostream &	print0x9204 (std::ostream &os, const Value &value)
	Print the exposure bias value.
std::ostream &	print0x9206 (std::ostream &os, const Value &value)
	Print the subject distance.
std::ostream &	print0x9207 (std::ostream &os, const Value &value)
	Print the metering mode.
std::ostream &	print0x9208 (std::ostream &os, const Value &value)
	Print the light source.
std::ostream &	print0x9209 (std::ostream &os, const Value &value)
	Print the flash status.
std::ostream &	print0x920a (std::ostream &os, const Value &value)
	Print the actual focal length of the lens.
std::ostream &	print0x9286 (std::ostream &os, const Value &value)
	Print the user comment.
std::ostream &	print0xa001 (std::ostream &os, const Value &value)
	Print color space information.
std::ostream &	print0xa217 (std::ostream &os, const Value &value)
	Print info on image sensor type on the camera or input device.
std::ostream &	print0xa300 (std::ostream &os, const Value &value)
	Print file source.
std::ostream &	print0xa301 (std::ostream &os, const Value &value)
	Print scene type.
std::ostream &	print0xa402 (std::ostream &os, const Value &value)
	Print the exposure mode.
std::ostream &	print0xa403 (std::ostream &os, const Value &value)
	Print white balance information.
std::ostream &	print0xa404 (std::ostream &os, const Value &value)
	Print digital zoom ratio.
std::ostream &	print0xa405 (std::ostream &os, const Value &value)
	Print 35mm equivalent focal length.
std::ostream &	print0xa406 (std::ostream &os, const Value &value)
	Print scene capture type.
std::ostream &	print0xa407 (std::ostream &os, const Value &value)
	Print overall image gain adjustment.
std::ostream &	print0xa408 (std::ostream &os, const Value &value)
	Print contract adjustment.
std::ostream &	print0xa409 (std::ostream &os, const Value &value)
	Print saturation adjustment.
std::ostream &	print0xa40a (std::ostream &os, const Value &value)
	Print sharpness adjustment.
std::ostream &	print0xa40c (std::ostream &os, const Value &value)
	Print subject distance range.
Typedefs
typedef std::vector< Exifdatum >	ExifMetadata
	Container type to hold all metadata.
typedef std::vector< Entry >	Entries
	Container type to hold all IFD directory entries.
typedef Image *(*	NewInstanceFct )(const std::string &path, FILE *ifp)
	Type for function pointer that creates new Image instances.
typedef bool(*	IsThisTypeFct )(FILE *ifp, bool advance)
	Type for function pointer that checks image types.
typedef std::vector< Iptcdatum >	IptcMetadata
	Container type to hold all metadata.
typedef MakerNote *(*	CreateFct )(bool, const byte *, long, ByteOrder, long)
	Type for a pointer to a function creating a makernote.
typedef std::ostream &(*	PrintFct )(std::ostream &, const Value &)
	Type for a function pointer for functions interpreting the tag value.
typedef unsigned char	byte
	1 byte unsigned integer type.
typedef unsigned short	uint16
	2 byte unsigned integer type.
typedef unsigned long	uint32
	4 byte unsigned integer type.
typedef short	int16
	2 byte signed integer type.
typedef long	int32
	4 byte signed integer type.
typedef std::pair< uint32, uint32 >	URational
	8 byte unsigned rational type.
typedef std::pair< int32, int32 >	Rational
	8 byte signed rational type.
typedef ValueType< uint16 >	UShortValue
	Unsigned short value type.
typedef ValueType< uint32 >	ULongValue
	Unsigned long value type.
typedef ValueType< URational >	URationalValue
	Unsigned rational value type.
typedef ValueType< int16 >	ShortValue
	Signed short value type.
typedef ValueType< int32 >	LongValue
	Signed long value type.
typedef ValueType< Rational >	RationalValue
	Signed rational value type.
Enumerations
enum	SectionId {   sectionIdNotSet, imgStruct, recOffset, imgCharacter,   otherTags, exifFormat, exifVersion, imgConfig,   userInfo, relatedFile, dateTime, captureCond,   gpsTags, iopTags, lastSectionId }
	Section identifiers to logically group tags. A section consists of nothing more than a name, based on the Exif standard.
enum	ByteOrder { invalidByteOrder, littleEndian, bigEndian }
	Type to express the byte order (little or big endian).
enum	TypeId {   invalidTypeId, unsignedByte, asciiString, unsignedShort,   unsignedLong, unsignedRational, invalid6, undefined,   signedShort, signedLong, signedRational, string,   date, time, lastTypeId }
	Type identifiers for IFD format types.
enum	IfdId {   ifdIdNotSet, ifd0Id, exifIfdId, gpsIfdId,   makerIfdId, iopIfdId, ifd1Id, lastIfdId }
	Type to specify the IFD to which a metadata belongs.
Functions
MakerNote *	createCanonMakerNote (bool alloc, const byte *buf, long len, ByteOrder byteOrder, long offset)
	Return a pointer to a newly created empty MakerNote initialized to operate in the memory management model indicated. The caller owns this copy and is responsible to delete it!
std::ostream &	operator<< (std::ostream &os, const DataSet &dataSet)
	Output operator for dataSet.
std::ostream &	operator<< (std::ostream &os, const Error &error)
	Error output operator
void	addToIfd (Ifd &ifd, ExifMetadata::const_iterator begin, ExifMetadata::const_iterator end, ByteOrder byteOrder)
	Add all metadata in the range from iterator position begin to iterator position end, which have an IFD id matching that of the IFD to the list of directory entries of ifd. No duplicate checks are performed, i.e., it is possible to add multiple metadata with the same key to an IFD.
void	addToIfd (Ifd &ifd, const Exifdatum &md, ByteOrder byteOrder)
	Add the Exifdatum to the IFD. No duplicate checks are performed, i.e., it is possible to add multiple metadata with the same key to an IFD.
void	addToMakerNote (MakerNote *makerNote, ExifMetadata::const_iterator begin, ExifMetadata::const_iterator end, ByteOrder byteOrder)
	Add all metadata in the range from iterator position begin to iterator position end with IFD id 'makerIfd' to the list of makernote entries of the object pointed to be makerNote. No duplicate checks are performed, i.e., it is possible to add multiple metadata with the same key to a makernote.
void	addToMakerNote (MakerNote *makerNote, const Exifdatum &md, ByteOrder byteOrder)
	Add the Exifdatum to makerNote, encoded in byte order byteOrder. No duplicate checks are performed, i.e., it is possible to add multiple metadata with the same key to a makernote.
std::ostream &	operator<< (std::ostream &os, const Exifdatum &md)
	Output operator for Exifdatum types, prints the interpreted tag value.
std::string	makeKey (const Entry &entry)
	Return a key for the entry. The key is of the form 'Exif.ifdItem.tagName'. This function knows about MakerNotes, i.e., it will invoke MakerNote::makeKey if necessary.
std::pair< uint16, IfdId >	decomposeKey (const std::string &key, const MakerNote *makerNote)
	Return the tag and IFD id pair for the key. This function knows about MakerNotes, i.e., it will forward the request to MakerNote::decomposeKey if necessary.
MakerNote *	createFujiMakerNote (bool alloc, const byte *buf, long len, ByteOrder byteOrder, long offset)
	Return a pointer to a newly created empty MakerNote initialized to operate in the memory management model indicated. The caller owns this copy and is responsible to delete it!
bool	cmpEntriesByTag (const Entry &lhs, const Entry &rhs)
	Compare two IFD entries by tag. Return true if the tag of entry lhs is less than that of rhs.
bool	cmpPreEntriesByOffset (const Ifd::PreEntry &lhs, const Ifd::PreEntry &rhs)
	Compare two 'pre-IFD entries' by offset, taking care of special cases where one or both of the entries don't have an offset. Return true if the offset of entry lhs is less than that of rhs, else false. By definition, entries without an offset are greater than those with an offset.
Image *	newExvInstance (const std::string &path, FILE *fp)
	Create a new ExvImage instance and return a pointer to it. Caller is responsible to delete the object when it is no longer needed.
bool	isExvType (FILE *ifp, bool advance)
	Check if the file ifp is an EXV file.
Image *	newJpegInstance (const std::string &path, FILE *fp)
	Create a new JpegImage instance and return a pointer to it. Caller is responsible to delete the object when it is no longer needed.
bool	isJpegType (FILE *ifp, bool advance)
	Check if the file ifp is a JPEG image.
bool	fileExists (const std::string &path, bool ct)
	Test if a file exists.
std::ostream &	operator<< (std::ostream &os, const Iptcdatum &md)
	Output operator for Iptcdatum types, printing the interpreted tag value.
std::ostream &	operator<< (std::ostream &os, const Metadatum &md)
	Output operator for Metadatum types, printing the interpreted tag value.
bool	cmpMetadataByTag (const Metadatum &lhs, const Metadatum &rhs)
	Compare two metadata by tag. Return true if the tag of metadatum lhs is less than that of rhs.
bool	cmpMetadataByKey (const Metadatum &lhs, const Metadatum &rhs)
	Compare two metadata by key. Return true if the key of metadatum lhs is less than that of rhs.
std::ostream &	operator<< (std::ostream &os, const Key &key)
	Output operator for Key types.
MakerNote *	createNikonMakerNote (bool alloc, const byte *buf, long len, ByteOrder byteOrder, long offset)
	Return a pointer to a newly created empty MakerNote initialized to operate in the memory management model indicated. The caller owns this copy and is responsible to delete it!
MakerNote *	createSigmaMakerNote (bool alloc, const byte *buf, long len, ByteOrder byteOrder, long offset)
	Return a pointer to a newly created empty MakerNote initialized to operate in the memory management model indicated. The caller owns this copy and is responsible to delete it!
std::ostream &	operator<< (std::ostream &os, const TagInfo &ti)
	Output operator for TagInfo.
std::ostream &	operator<< (std::ostream &os, const Rational &r)
	Output operator for our fake rational.
std::istream &	operator>> (std::istream &is, Rational &r)
	Input operator for our fake rational.
std::ostream &	operator<< (std::ostream &os, const URational &r)
	Output operator for our fake unsigned rational.
std::istream &	operator>> (std::istream &is, URational &r)
	Input operator for our fake unsigned rational.
uint16	getUShort (const byte *buf, ByteOrder byteOrder)
	Read a 2 byte unsigned short value from the data buffer.
uint32	getULong (const byte *buf, ByteOrder byteOrder)
	Read a 4 byte unsigned long value from the data buffer.
URational	getURational (const byte *buf, ByteOrder byteOrder)
	Read an 8 byte unsigned rational value from the data buffer.
int16	getShort (const byte *buf, ByteOrder byteOrder)
	Read a 2 byte signed short value from the data buffer.
int32	getLong (const byte *buf, ByteOrder byteOrder)
	Read a 4 byte signed long value from the data buffer.
Rational	getRational (const byte *buf, ByteOrder byteOrder)
	Read an 8 byte signed rational value from the data buffer.
long	us2Data (byte *buf, uint16 s, ByteOrder byteOrder)
	Convert an unsigned short to data, write the data to the buffer, return number of bytes written.
long	ul2Data (byte *buf, uint32 l, ByteOrder byteOrder)
	Convert an unsigned long to data, write the data to the buffer, return number of bytes written.
long	ur2Data (byte *buf, URational l, ByteOrder byteOrder)
	Convert an unsigned rational to data, write the data to the buffer, return number of bytes written.
long	s2Data (byte *buf, int16 s, ByteOrder byteOrder)
	Convert a signed short to data, write the data to the buffer, return number of bytes written.
long	l2Data (byte *buf, int32 l, ByteOrder byteOrder)
	Convert a signed long to data, write the data to the buffer, return number of bytes written.
long	r2Data (byte *buf, Rational l, ByteOrder byteOrder)
	Convert a signed rational to data, write the data to the buffer, return number of bytes written.
void	hexdump (std::ostream &os, const byte *buf, long len, long offset)
	Print len bytes from buf in hex and ASCII format to the given stream, prefixed with the position in the buffer adjusted by offset.
int	gcd (int a, int b)
	Return the greatest common denominator of integers a and b. Both parameters must be greater than 0.
long	lgcd (long a, long b)
	Return the greatest common denominator of long values a and b. Both parameters must be greater than 0.
template<typename T> std::string	toString (const T &arg)
	Utility function to convert the argument of any type to a string.
std::ostream &	operator<< (std::ostream &os, const Value &value)
	Output operator for Value types.
template<typename T> TypeId	getType ()
	Template to determine the TypeId for a type T.
template<> TypeId	getType< uint16 > ()
	Specialization for an unsigned short.
template<> TypeId	getType< uint32 > ()
	Specialization for an unsigned long.
template<> TypeId	getType< URational > ()
	Specialization for an unsigned rational.
template<> TypeId	getType< int16 > ()
	Specialization for a signed short.
template<> TypeId	getType< int32 > ()
	Specialization for a signed long.
template<> TypeId	getType< Rational > ()
	Specialization for a signed rational.
template<typename T> T	getValue (const byte *buf, ByteOrder byteOrder)
	Read a value of type T from the data buffer.
template<typename T> long	toData (byte *buf, T t, ByteOrder byteOrder)
	Convert a value of type T to data, write the data to the data buffer.
template<> long	toData (byte *buf, uint16 t, ByteOrder byteOrder)
	Specialization to write an unsigned short to the data buffer. Return the number of bytes written.
template<> long	toData (byte *buf, uint32 t, ByteOrder byteOrder)
	Specialization to write an unsigned long to the data buffer. Return the number of bytes written.
template<> long	toData (byte *buf, URational t, ByteOrder byteOrder)
	Specialization to write an unsigned rational to the data buffer. Return the number of bytes written.
template<> long	toData (byte *buf, int16 t, ByteOrder byteOrder)
	Specialization to write a signed short to the data buffer. Return the number of bytes written.
template<> long	toData (byte *buf, int32 t, ByteOrder byteOrder)
	Specialization to write a signed long to the data buffer. Return the number of bytes written.
template<> long	toData (byte *buf, Rational t, ByteOrder byteOrder)
	Specialization to write a signed rational to the data buffer. Return the number of bytes written.

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Detailed Description

Provides classes and functions to encode and decode Exif and Iptc data. This namespace corresponds to the libexiv2 library.

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Function Documentation

MakerNote * Exiv2::createCanonMakerNote (  bool  alloc, const byte *  buf, long  len, ByteOrder  byteOrder, long  offset )

Return a pointer to a newly created empty MakerNote initialized to operate in the memory management model indicated. The caller owns this copy and is responsible to delete it! Parameters: alloc  Memory management model for the new MakerNote. Determines if memory required to store data should be allocated and deallocated (true) or not (false). If false, only pointers to the buffer provided to read() will be kept. See Ifd for more background on this concept. buf  Pointer to the makernote character buffer (not used). len  Length of the makernote character buffer (not used). byteOrder  Byte order in which the Exif data (and possibly the makernote) is encoded (not used). offset  Offset from the start of the TIFF header of the makernote buffer (not used). Returns: A pointer to a newly created empty MakerNote. The caller owns this copy and is responsible to delete it!

MakerNote * Exiv2::createFujiMakerNote (  bool  alloc, const byte *  buf, long  len, ByteOrder  byteOrder, long  offset )

Return a pointer to a newly created empty MakerNote initialized to operate in the memory management model indicated. The caller owns this copy and is responsible to delete it! Parameters: alloc  Memory management model for the new MakerNote. Determines if memory required to store data should be allocated and deallocated (true) or not (false). If false, only pointers to the buffer provided to read() will be kept. See Ifd for more background on this concept. buf  Pointer to the makernote character buffer (not used). len  Length of the makernote character buffer (not used). byteOrder  Byte order in which the Exif data (and possibly the makernote) is encoded (not used). offset  Offset from the start of the TIFF header of the makernote buffer (not used). Returns: A pointer to a newly created empty MakerNote. The caller owns this copy and is responsible to delete it!

MakerNote * Exiv2::createNikonMakerNote (  bool  alloc, const byte *  buf, long  len, ByteOrder  byteOrder, long  offset )

Return a pointer to a newly created empty MakerNote initialized to operate in the memory management model indicated. The caller owns this copy and is responsible to delete it! Parameters: alloc  Memory management model for the new MakerNote. Determines if memory required to store data should be allocated and deallocated (true) or not (false). If false, only pointers to the buffer provided to read() will be kept. See Ifd for more background on this concept. buf  Pointer to the makernote character buffer (not used). len  Length of the makernote character buffer (not used). byteOrder  Byte order in which the Exif data (and possibly the makernote) is encoded (not used). offset  Offset from the start of the TIFF header of the makernote buffer (not used). Returns: A pointer to a newly created empty MakerNote. The caller owns this copy and is responsible to delete it!

MakerNote * Exiv2::createSigmaMakerNote (  bool  alloc, const byte *  buf, long  len, ByteOrder  byteOrder, long  offset )

Return a pointer to a newly created empty MakerNote initialized to operate in the memory management model indicated. The caller owns this copy and is responsible to delete it! Parameters: alloc  Memory management model for the new MakerNote. Determines if memory required to store data should be allocated and deallocated (true) or not (false). If false, only pointers to the buffer provided to read() will be kept. See Ifd for more background on this concept. buf  Pointer to the makernote character buffer (not used). len  Length of the makernote character buffer (not used). byteOrder  Byte order in which the Exif data (and possibly the makernote) is encoded (not used). offset  Offset from the start of the TIFF header of the makernote buffer (not used). Returns: A pointer to a newly created empty MakerNote. The caller owns this copy and is responsible to delete it!

std::pair< uint16, IfdId > Exiv2::decomposeKey (  const std::string &  key, const MakerNote *  makerNote )

Return the tag and IFD id pair for the key. This function knows about MakerNotes, i.e., it will forward the request to MakerNote::decomposeKey if necessary. Returns: A pair consisting of the tag and IFD id. Exceptions: Error  ("Invalid key") if the key cannot be parsed into item item, section name and tag name parts.

bool Exiv2::fileExists (  const std::string &  path, bool  ct = false )

Test if a file exists. Parameters: path  Name of file to verify. ct  Flag to check if path is a regular file. Returns: true if path exists and, if ct is set, is a regular file, else false. Note: The function calls stat() test for path and its type, see stat(2). errno is left unchanged in case of an error.

template<typename T> Rational Exiv2::getValue (  const byte *  buf, ByteOrder  byteOrder )  [inline]

Read a value of type T from the data buffer. We need this template function for the ValueType template classes. There are only specializations of this function available; no default implementation is provided. Parameters: buf  Pointer to the data buffer to read from. byteOrder  Applicable byte order (little or big endian). Returns: A value of type T.

template<typename T> long toData (  byte *  buf, T  t, ByteOrder  byteOrder )

Convert a value of type T to data, write the data to the data buffer. We need this template function for the ValueType template classes. There are only specializations of this function available; no default implementation is provided. Parameters: buf  Pointer to the data buffer to write to. t  Value to be converted. byteOrder  Applicable byte order (little or big endian). Returns: The number of bytes written to the buffer.

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