mrpt::io::CFileGZInputStream Class Reference

Detailed Description

Transparently opens a compressed "gz" file and reads uncompressed data from it.

If the file is not a .gz file, it silently reads data from the file. This class requires compiling MRPT with wxWidgets. If wxWidgets is not available then the class is actually mapped to the standard CFileInputStream

See also

CFileInputStream

Definition at line 26 of file io/CFileGZInputStream.h.

#include <mrpt/io/CFileGZInputStream.h>

Inheritance diagram for mrpt::io::CFileGZInputStream:

Classes
struct	Impl

Public Types
enum	TSeekOrigin { sFromBeginning = 0, sFromCurrent = 1, sFromEnd = 2 }
	Used in CStream::Seek. More...

Public Member Functions
	CFileGZInputStream ()
	Constructor without open. More...
	CFileGZInputStream (const std::string &fileName)
	Constructor and open. More...
	CFileGZInputStream (const CFileGZInputStream &)=delete
CFileGZInputStream &	operator= (const CFileGZInputStream &)=delete
	~CFileGZInputStream () override
	Dtor. More...
bool	open (const std::string &fileName, mrpt::optional_ref< std::string > error_msg=std::nullopt)
	Opens the file for read. More...
void	close ()
	Closes the file. More...
bool	fileOpenCorrectly () const
	Returns true if the file was open without errors. More...
bool	is_open ()
	Returns true if the file was open without errors. More...
bool	checkEOF ()
	Will be true if EOF has been already reached. More...
uint64_t	getTotalBytesCount () const override
	Method for getting the total number of compressed bytes of in the file (the physical size of the compressed file). More...
uint64_t	getPosition () const override
	Method for getting the current cursor position in the compressed, where 0 is the first byte and TotalBytesCount-1 the last one. More...
uint64_t	Seek (int64_t, CStream::TSeekOrigin=sFromBeginning) override
	This method is not implemented in this class. More...
size_t	Read (void *Buffer, size_t Count) override
	Introduces a pure virtual method responsible for reading from the stream. More...
size_t	Write (const void *Buffer, size_t Count) override
	Introduces a pure virtual method responsible for writing to the stream. More...
virtual size_t	ReadBufferImmediate (void *Buffer, size_t Count)
	Reads a block of bytes from the stream into Buffer, and returns the amound of bytes actually read, without waiting for more extra bytes to arrive (just those already enqued in the stream). More...
virtual int	printf (const char *fmt,...) MRPT_printf_format_check(2
	Writes a string to the stream in a textual form. More...
template<typename CONTAINER_TYPE >
virtual int void	printf_vector (const char *fmt, const CONTAINER_TYPE &V, char separator=',')
	Prints a vector in the format [A,B,C,...] using CStream::printf, and the fmt string for each vector element T. More...
bool	getline (std::string &out_str)
	Reads from the stream until a ' ' character is found ('' characters are ignored). More...

Private Attributes
mrpt::pimpl< Impl >	m_f
uint64_t	m_file_size {0}
	Compressed file size. More...

Member Enumeration Documentation

TSeekOrigin

enum mrpt::io::CStream::TSeekOrigin

inherited

Used in CStream::Seek.

Enumerator
sFromBeginning
sFromCurrent
sFromEnd

Definition at line 32 of file io/CStream.h.

Constructor & Destructor Documentation

CFileGZInputStream() [1/3]

CFileGZInputStream::CFileGZInputStream

(

)

Constructor without open.

Definition at line 33 of file CFileGZInputStream.cpp.

CFileGZInputStream() [2/3]

CFileGZInputStream::CFileGZInputStream

(

const std::string &

fileName

)

Constructor and open.

Parameters

fileName

The file to be open in this stream

Exceptions

std::exception

If there's an error opening the file.

Definition at line 38 of file CFileGZInputStream.cpp.

References MRPT_END, MRPT_START, and open().

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CFileGZInputStream() [3/3]

mrpt::io::CFileGZInputStream::CFileGZInputStream ( const CFileGZInputStream &  )

delete

~CFileGZInputStream()

CFileGZInputStream::~CFileGZInputStream ( )

override

Dtor.

Definition at line 81 of file CFileGZInputStream.cpp.

References close().

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Member Function Documentation

checkEOF()

bool CFileGZInputStream::checkEOF

(

)

Will be true if EOF has been already reached.

Definition at line 117 of file CFileGZInputStream.cpp.

References m_f.

close()

void CFileGZInputStream::close

(

)

Closes the file.

Definition at line 72 of file CFileGZInputStream.cpp.

References m_f.

Referenced by ~CFileGZInputStream().

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fileOpenCorrectly()

bool CFileGZInputStream::fileOpenCorrectly

(

)

const

Returns true if the file was open without errors.

Definition at line 116 of file CFileGZInputStream.cpp.

References m_f.

Referenced by mrpt::io::zip::decompress_gz_file(), is_open(), mrpt::maps::CGasConcentrationGridMap2D::load_Gaussian_Wind_Grid_From_File(), and mrpt::nav::CPTG_DiffDrive_CollisionGridBased::loadColGridsFromFile().

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getline()

bool CStream::getline ( std::string &  out_str )

inherited

Reads from the stream until a '
' character is found ('' characters are ignored).

Returns

false on EOF or any other read error.

Definition at line 69 of file CStream.cpp.

getPosition()

uint64_t CFileGZInputStream::getPosition ( ) const

overridevirtual

Method for getting the current cursor position in the compressed, where 0 is the first byte and TotalBytesCount-1 the last one.

Implements mrpt::io::CStream.

Definition at line 107 of file CFileGZInputStream.cpp.

References m_f, and THROW_EXCEPTION.

getTotalBytesCount()

uint64_t CFileGZInputStream::getTotalBytesCount ( ) const

overridevirtual

Method for getting the total number of compressed bytes of in the file (the physical size of the compressed file).

Implements mrpt::io::CStream.

Definition at line 98 of file CFileGZInputStream.cpp.

References m_f, m_file_size, and THROW_EXCEPTION.

Referenced by mrpt::io::zip::decompress_gz_file().

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is_open()

bool mrpt::io::CFileGZInputStream::is_open ( )

inline

Returns true if the file was open without errors.

Definition at line 62 of file io/CFileGZInputStream.h.

References fileOpenCorrectly().

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open()

bool CFileGZInputStream::open	(	const std::string &	fileName,
		mrpt::optional_ref< std::string >	error_msg = std::nullopt
	)

Opens the file for read.

Parameters

fileName

The file to be open in this stream

Returns

false if there's an error opening the file, true otherwise

Definition at line 46 of file CFileGZInputStream.cpp.

References mrpt::format(), mrpt::system::getFileSize(), m_f, m_file_size, MRPT_END, and MRPT_START.

Referenced by CFileGZInputStream(), mrpt::apps::DataSourceRawlog::impl_get_next_observations(), mrpt::maps::CPointsMapXYZI::loadFromKittiVelodyneFile(), mrpt::obs::CRawlog::loadFromRawLogFile(), and TEST().

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operator=()

CFileGZInputStream& mrpt::io::CFileGZInputStream::operator= ( const CFileGZInputStream &  )

delete

printf()

int CStream::printf ( const char *  fmt,   ...  )

virtualinherited

Writes a string to the stream in a textual form.

See also

CStdOutStream

Definition at line 30 of file CStream.cpp.

References MRPT_END, MRPT_START, and mrpt::system::os::vsnprintf().

Referenced by mrpt::hmtslam::CTopLCDetector_GridMatching::computeTopologicalObservationModel(), mrpt::apps::MonteCarloLocalization_Base::do_pf_localization(), mrpt::io::CStream::printf_vector(), mrpt::apps::CGridMapAlignerApp::run(), mrpt::apps::RBPF_SLAM_App_Base::run(), and mrpt::apps::ICP_SLAM_App_Base::run().

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printf_vector()

template<typename CONTAINER_TYPE >

virtual int void mrpt::io::CStream::printf_vector ( const char *  fmt, const CONTAINER_TYPE &  V, char  separator = ','  )

inlineinherited

Prints a vector in the format [A,B,C,...] using CStream::printf, and the fmt string for each vector element T.

Template Parameters

CONTAINER_TYPE

can be any vector<T>, deque<T> or alike.

Definition at line 102 of file io/CStream.h.

References mrpt::io::CStream::printf().

Referenced by mrpt::hmtslam::CTopLCDetector_GridMatching::computeTopologicalObservationModel().

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Read()

size_t CFileGZInputStream::Read ( void *  Buffer, size_t  Count  )

overridevirtual

Introduces a pure virtual method responsible for reading from the stream.

Implements mrpt::io::CStream.

Definition at line 82 of file CFileGZInputStream.cpp.

References m_f, and THROW_EXCEPTION.

Referenced by mrpt::io::zip::decompress_gz_file(), and TEST().

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ReadBufferImmediate()

virtual size_t mrpt::io::CStream::ReadBufferImmediate ( void *  Buffer, size_t  Count  )

inlinevirtualinherited

Reads a block of bytes from the stream into Buffer, and returns the amound of bytes actually read, without waiting for more extra bytes to arrive (just those already enqued in the stream).

Note that this method will fallback to ReadBuffer() in most CStream classes but in some hardware-related classes.

Exceptions

std::exception

On any error, or if ZERO bytes are read.

Reimplemented in mrpt::comms::CInterfaceFTDI.

Definition at line 62 of file io/CStream.h.

References mrpt::io::CStream::Read().

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Seek()

uint64_t CFileGZInputStream::Seek ( int64_t  , CStream::TSeekOrigin  = sFromBeginning  )

overridevirtual

This method is not implemented in this class.

Implements mrpt::io::CStream.

Definition at line 125 of file CFileGZInputStream.cpp.

References THROW_EXCEPTION.

Write()

size_t CFileGZInputStream::Write ( const void *  Buffer, size_t  Count  )

overridevirtual

Introduces a pure virtual method responsible for writing to the stream.

Write attempts to write up to Count bytes to Buffer, and returns the number of bytes actually written.

Implements mrpt::io::CStream.

Definition at line 92 of file CFileGZInputStream.cpp.

References THROW_EXCEPTION.

Member Data Documentation

m_f

mrpt::pimpl<Impl> mrpt::io::CFileGZInputStream::m_f

private

Definition at line 29 of file io/CFileGZInputStream.h.

Referenced by checkEOF(), close(), fileOpenCorrectly(), getPosition(), getTotalBytesCount(), open(), and Read().

m_file_size

uint64_t mrpt::io::CFileGZInputStream::m_file_size {0}

private

Compressed file size.

Definition at line 32 of file io/CFileGZInputStream.h.

Referenced by getTotalBytesCount(), and open().