abstraction of filesystem files for entrepot More...

#include <fichier_global.hpp>

Inheritance diagram for libdar::fichier_global:

Collaboration diagram for libdar::fichier_global:

Public Types
enum	advise { advise_normal , advise_sequential , advise_random , advise_noreuse , advise_willneed , advise_dontneed }

Public Types inherited from libdar::generic_file
enum	skippability { skip_backward , skip_forward }

Public Member Functions
	fichier_global (const std::shared_ptr< user_interaction > &dialog, gf_mode mode)
	constructor More...

	fichier_global (const fichier_global &ref)=default
	copy constructor

	fichier_global (fichier_global &&ref) noexcept=default
	move constructor

fichier_global &	operator= (const fichier_global &ref)=default
	assignment operator

fichier_global &	operator= (fichier_global &&ref) noexcept=default
	move operator

virtual void	change_ownership (const std::string &user, const std::string &group)=0
	set the ownership of the file

virtual void	change_permission (U_I perm)=0
	change the permission of the file

virtual infinint	get_size () const =0
	return the size of the file

virtual void	fadvise (advise adv) const =0
	set posix_fadvise for the whole file

Public Member Functions inherited from libdar::generic_file
	generic_file (gf_mode m)
	main constructor

	generic_file (const generic_file &ref)
	copy constructor

	generic_file (generic_file &&ref) noexcept
	move constructor

generic_file &	operator= (const generic_file &ref)
	assignment operator

generic_file &	operator= (generic_file &&ref) noexcept
	move operator

	~generic_file () noexcept(false)
	virtual destructor, More...

void	terminate ()
	destructor-like call, except that it is allowed to throw exceptions

bool	operator== (generic_file &ref)

bool	operator!= (generic_file &ref)

gf_mode	get_mode () const
	retreive the openning mode for this object

void	read_ahead (const infinint &amount)

void	ignore_read_ahead (bool mode)

virtual U_I	read (char *a, U_I size) override
	read data from the generic_file inherited from proto_generic_file

virtual void	write (const char *a, U_I size) override
	write data to the generic_file inherited from proto_generic_file

void	write (const std::string &arg)
	write a string to the generic_file More...

S_I	read_back (char &a)
	skip back one char, read on char and skip back one char

S_I	read_forward (char &a)
	read one char

virtual bool	skippable (skippability direction, const infinint &amount)=0
	whether the implementation is able to skip More...

virtual bool	skip (const infinint &pos)=0
	skip at the absolute position More...

virtual bool	skip_to_eof ()=0
	skip to the end of file

virtual bool	skip_relative (S_I x)=0
	skip relatively to the current position

virtual bool	truncatable (const infinint &pos) const =0
	whether the implementation is able to truncate to the given position

virtual void	truncate (const infinint &pos)
	truncate file at the given offset More...

virtual infinint	get_position () const =0
	get the current read/write position

virtual void	copy_to (generic_file &ref)
	copy all data from current position to the object in argument

virtual void	copy_to (generic_file &ref, const infinint &crc_size, crc *&value)
	copy all data from the current position to the object in argument and computes a CRC value of the transmitted data More...

U_32	copy_to (generic_file &ref, U_32 size)
	small copy (up to 4GB) with CRC calculation

infinint	copy_to (generic_file &ref, infinint size)
	copy the given amount to the object in argument

bool	diff (generic_file &f, const infinint &me_read_ahead, const infinint &you_read_ahead, const infinint &crc_size, crc *&value)
	compares the contents with the object in argument More...

bool	diff (generic_file &f, const infinint &me_read_ahead, const infinint &you_read_ahead, const infinint &crc_size, crc *&value, infinint &err_offset)

void	reset_crc (const infinint &width)
	reset CRC on read or writen data More...

bool	crc_status () const
	to known whether CRC calculation is activated or not

crc *	get_crc ()
	get CRC of the transfered date since last reset More...

void	sync_write ()
	write any pending data

void	flush_read ()
	be ready to read at current position, reseting all pending data for reading, cached and in compression engine for example

Public Member Functions inherited from libdar::proto_generic_file
	proto_generic_file (const proto_generic_file &ref)=default
	copy constructor

	proto_generic_file (proto_generic_file &&ref) noexcept=default
	move constructor

proto_generic_file &	operator= (const proto_generic_file &ref)=default
	assignment operator

proto_generic_file &	operator= (proto_generic_file &&ref) noexcept=default
	move operator

virtual	~proto_generic_file () noexcept(false)
	virtual destructor More...

Public Member Functions inherited from libdar::thread_cancellation
	thread_cancellation ()
	the constructor

	thread_cancellation (const thread_cancellation &ref)=default
	copy constructor

	thread_cancellation (thread_cancellation &&ref) noexcept=default
	move constructor

thread_cancellation &	operator= (const thread_cancellation &ref)=default
	assignment operator

thread_cancellation &	operator= (thread_cancellation &&ref) noexcept=default
	move operator

virtual	~thread_cancellation () noexcept(false)
	the destructor

void	check_self_cancellation () const
	Checkpoint test : whether the current libdar call must abort or not. More...

void	block_delayed_cancellation (bool mode)

Public Member Functions inherited from libdar::mem_ui
	mem_ui (const std::shared_ptr< user_interaction > &dialog)
	constructor More...

	mem_ui (const mem_ui &ref)=default
	the copy constructor More...

	mem_ui (mem_ui &&ref) noexcept=default
	the move constructor

mem_ui &	operator= (const mem_ui &ref)=default
	assignement operator More...

mem_ui &	operator= (mem_ui &&ref) noexcept=default
	move operator

virtual	~mem_ui () noexcept(false)
	destructor More...

Protected Member Functions
virtual U_I	fichier_global_inherited_write (const char *a, U_I size)=0
	replaces generic_file::inherited_write() method, to allow the return of partial writings More...

virtual bool	fichier_global_inherited_read (char *a, U_I size, U_I &read, std::string &message)=0
	replaces generic_file::inherited_read() method, to allow the return of partial reading More...

Protected Member Functions inherited from libdar::generic_file
void	set_mode (gf_mode x)

virtual void	inherited_read_ahead (const infinint &amount)=0
	tells the object that several calls to read() will follow to probably obtain at least the given amount of data More...

virtual void	inherited_truncate (const infinint &pos)=0
	truncate file at the give offset More...

virtual void	inherited_sync_write ()=0
	write down any pending data More...

virtual void	inherited_flush_read ()=0
	reset internal engine, flush caches in order to read the data at current position More...

virtual void	inherited_terminate ()=0
	destructor-like call, except that it is allowed to throw exceptions More...

bool	is_terminated () const

Protected Member Functions inherited from libdar::mem_ui
user_interaction &	get_ui () const
	get access to the user_interaction object More...

std::shared_ptr< user_interaction >	get_pointer () const
	get access to the shared_ptr pointing to the user_interaction

Private Member Functions
virtual void	inherited_write (const char *a, U_I size) override
	implementation of the write() operation More...

virtual U_I	inherited_read (char *a, U_I size) override
	implementation of read() operation More...

Private Attributes
bool	disk_full
	whether user refused to continue due to disk being full

Additional Inherited Members
Static Public Member Functions inherited from libdar::thread_cancellation
static U_I	count ()
	method for debugging/control purposes

Detailed Description

abstraction of filesystem files for entrepot

Definition at line 58 of file fichier_global.hpp.

Member Enumeration Documentation

◆ advise

enum libdar::fichier_global::advise

Enumerator
advise_normal	no advise given by the application
advise_sequential	application expect to read the data sequentially
advise_random	application expect to read the data in random order
advise_noreuse	application does not expect to read the data more than once
advise_willneed	application expect to read the data again in near future
advise_dontneed	application will not read the data in near future

Definition at line 61 of file fichier_global.hpp.

Constructor & Destructor Documentation

◆ fichier_global()

libdar::fichier_global::fichier_global	(	const std::shared_ptr< user_interaction > &	dialog,
		gf_mode	mode
	)

inline

constructor

Note: some well defined error case must generate an Esystem exception, other by Erange or more appropriated Egeneric exceptions to known what type of error must be handled by Esystem object, see the Esystem::io_error enum

Definition at line 76 of file fichier_global.hpp.

Member Function Documentation

◆ fichier_global_inherited_read()

virtual bool libdar::fichier_global::fichier_global_inherited_read	(	char *	a,
		U_I	size,
		U_I &	read,
		std::string &	message
	)

protectedpure virtual

replaces generic_file::inherited_read() method, to allow the return of partial reading

a partial reading is signaled by the inherited class by returning false

Parameters

[in]	a	points to the area where to store read data
[in]	size	is the available place to store data
[out]	read	is the total amount of data read so far
[out]	message	is the request to send to the user upon partial reading

Returns: true if the reading is full (either read the maximum allowed data or reached end of file) false is returned if a user interaction can let the reading go further the message to display to the user asking him for action. He will also be proposed to abort the current operation.

Implemented in libdar::tuyau_global, libdar::hash_fichier, libdar::generic_to_global_file, libdar::fichier_local, and libdar::cache_global.

◆ fichier_global_inherited_write()

virtual U_I libdar::fichier_global::fichier_global_inherited_write	(	const char *	a,
		U_I	size
	)

protectedpure virtual

replaces generic_file::inherited_write() method, to allow the return of partial writings

a partial writing is allowed when no space is available for writing this let global_ficher interact with the user asking whether it can make place or if (s)he wants to abort

Parameters

[in]	a	points to the start of the area of data to write
[in]	size	is the size in byte of the data to write

Returns: the amount of byte wrote. If the returned value is less than size, this is a partial write, and is assumed that free storage space is missing to complete the operation

Implemented in libdar::tuyau_global, libdar::hash_fichier, libdar::generic_to_global_file, libdar::fichier_local, and libdar::cache_global.

◆ inherited_read()

virtual U_I libdar::fichier_global::inherited_read	(	char *	a,
		U_I	size
	)

overrideprivatevirtual

implementation of read() operation

Parameters

[in,out]	a	where to put the data to read
[in]	size	says how much data to read

Returns: the exact amount of data read and put into 'a'

Note: read as much byte as requested, up to end of file stays blocked if not enough data is available and EOF not yet met. May return less data than requested only if EOF as been reached. in other worlds, EOF is reached when returned data is stricly less than the requested data Any problem shall be reported by throwing an exception.

Implements libdar::generic_file.

◆ inherited_write()

virtual void libdar::fichier_global::inherited_write	(	const char *	a,
		U_I	size
	)

overrideprivatevirtual

implementation of the write() operation

Parameters

[in]	a	what data to write
[in]	size	amount of data to write

Note: must either write all data or report an error by throwing an exception

Implements libdar::generic_file.

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

fichier_global.hpp

Public Types

Public Member Functions

Protected Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ advise

Constructor & Destructor Documentation

◆ fichier_global()

Member Function Documentation

◆ fichier_global_inherited_read()

◆ fichier_global_inherited_write()

◆ inherited_read()

◆ inherited_write()