TagParser::MatroskaSeekInfo Class Reference

The MatroskaSeekInfo class helps parsing and making "SeekHead"-elements. More...

#include <matroskaseekinfo.h>

Public Member Functions
	MatroskaSeekInfo ()
	Constructs a new MatroskaSeekInfo.
const std::vector< EbmlElement * > &	seekHeadElements () const
	Returns a pointer to the seek head elements the seek information is composed of.
const std::vector< std::pair< EbmlElement::IdentifierType, std::uint64_t > > &	info () const
	Returns the seek information gathered when the parse() method was called.
std::vector< std::pair< EbmlElement::IdentifierType, std::uint64_t > > &	info ()
	Returns a mutable version of the seek information gathered when the parse() method was called.
void	shift (std::uint64_t start, std::int64_t amount)
	Shifts all offsets greater or equal than start by amount bytes.
void	parse (EbmlElement *seekHeadElements, Diagnostics &diag, std::size_t maxIndirection=1)
	Parses the specified seekHeadElement and populates info() with the gathered information.
void	make (std::ostream &stream, Diagnostics &diag)
	Writes a "SeekHead" element for the current instance to the specified stream.
std::uint64_t	minSize () const
	Returns the minimal number of bytes written when calling the make() method.
std::uint64_t	maxSize () const
	Returns the maximal number of bytes written when calling the make() method.
std::uint64_t	actualSize () const
	Returns the number of bytes which will be written when calling the make() method.
bool	push (unsigned int index, EbmlElement::IdentifierType id, std::uint64_t offset)
	Pushes the specified offset of an element with the specified id to the info.
void	clear ()
	Resets the object to its initial state.

Detailed Description

The MatroskaSeekInfo class helps parsing and making "SeekHead"-elements.

Constructor & Destructor Documentation

MatroskaSeekInfo()

TagParser::MatroskaSeekInfo::MatroskaSeekInfo ( )

inline

Constructs a new MatroskaSeekInfo.

Definition at line 37 of file matroskaseekinfo.h.

Member Function Documentation

actualSize()

std::uint64_t TagParser::MatroskaSeekInfo::actualSize

(

)

const

Returns the number of bytes which will be written when calling the make() method.

Remarks

The returned value gets invalidated when the object is mutated.

Definition at line 212 of file matroskaseekinfo.cpp.

clear()

void TagParser::MatroskaSeekInfo::clear

(

)

Resets the object to its initial state.

Definition at line 251 of file matroskaseekinfo.cpp.

info() [1/2]

std::vector< std::pair< EbmlElement::IdentifierType, std::uint64_t > > & TagParser::MatroskaSeekInfo::info ( )

inline

Returns a mutable version of the seek information gathered when the parse() method was called.

Returns

Returns the seek information as pairs of element IDs and the associated offsets (relative to the beginning of the file).

Definition at line 64 of file matroskaseekinfo.h.

info() [2/2]

const std::vector< std::pair< EbmlElement::IdentifierType, std::uint64_t > > & TagParser::MatroskaSeekInfo::info ( ) const

inline

Returns the seek information gathered when the parse() method was called.

Returns

Returns the seek information as pairs of element IDs and the associated offsets (relative to the beginning of the file).

Definition at line 55 of file matroskaseekinfo.h.

make()

void TagParser::MatroskaSeekInfo::make	(	std::ostream &	stream,
		Diagnostics &	diag )

Writes a "SeekHead" element for the current instance to the specified stream.

Parameters

stream

Specifies the stream to write the "SeekHead" element to.

Exceptions

Throws	ios_base::failure when an IO error occurs.
Throws	Failure or a derived exception when a making error occurs.

Definition at line 147 of file matroskaseekinfo.cpp.

maxSize()

std::uint64_t TagParser::MatroskaSeekInfo::maxSize

(

)

const

Returns the maximal number of bytes written when calling the make() method.

Remarks

The returned value gets invalidated when the object is mutated.

Definition at line 202 of file matroskaseekinfo.cpp.

minSize()

std::uint64_t TagParser::MatroskaSeekInfo::minSize

(

)

const

Returns the minimal number of bytes written when calling the make() method.

Remarks

The returned value gets invalidated when the object is mutated.

Definition at line 192 of file matroskaseekinfo.cpp.

parse()

void TagParser::MatroskaSeekInfo::parse	(	EbmlElement *	seekHeadElements,
		Diagnostics &	diag,
		std::size_t	maxIndirection = 1 )

Parses the specified seekHeadElement and populates info() with the gathered information.

Exceptions

Throws	ios_base::failure when an IO error occurs.
Throws	Failure or a derived exception when a parsing error occurs.

Remarks

• The object does not take ownership over the specified seekHeadElement.
• Possibly previously parsed info() is not cleared. So subsequent calls can be used to gather seek information from multiple seek head elements. Use clear() manually if that is not wanted.
• If the specified seekHeadElement references another seek head element the referenced seek head element is parsed as well. One can set maxIndirection to 0 to prevent that or even increase the value to allow following references even more deeply. References to elements which have already been visited are never followed, though.

Definition at line 51 of file matroskaseekinfo.cpp.

push()

bool TagParser::MatroskaSeekInfo::push	(	unsigned int	index,
		EbmlElement::IdentifierType	id,
		std::uint64_t	offset )

Pushes the specified offset of an element with the specified id to the info.

If there is an existing entry with the same id and index the existing entry will be updated and no new entry created.

Returns

Returns an indication whether the actualSize() has changed.

Definition at line 231 of file matroskaseekinfo.cpp.

seekHeadElements()

const std::vector< EbmlElement * > & TagParser::MatroskaSeekInfo::seekHeadElements ( ) const

inline

Returns a pointer to the seek head elements the seek information is composed of.

Remarks

This list is initially empty. When calling parse() it is at least populated with the specified seek head element (ownership remains by the caller). In case that seek table references another seek table those elements are also returned (the MatroskaSeekInfo has ownership).

Definition at line 46 of file matroskaseekinfo.h.

shift()

void TagParser::MatroskaSeekInfo::shift	(	std::uint64_t	start,
		std::int64_t	amount )

Shifts all offsets greater or equal than start by amount bytes.

Definition at line 25 of file matroskaseekinfo.cpp.

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

• matroska/matroskaseekinfo.h
• matroska/matroskaseekinfo.cpp