#include <trivial_sar.hpp>

Inheritance diagram for libdar::trivial_sar:

Collaboration diagram for libdar::trivial_sar:

Public Member Functions
	trivial_sar (const std::shared_ptr< user_interaction > &dialog, gf_mode open_mode, const std::string &base_name, const std::string &extension, const entrepot &where, const label &internal_nale, const label &data_name, const std::string &execute, bool allow_over, bool warn_over, bool force_permission, U_I permission, hash_algo x_hash, const infinint &min_digits, bool format_07_compatible)
	constructor to build a new single sliced archive More...

	trivial_sar (const std::shared_ptr< user_interaction > &dialog, const std::string &pipename, bool lax)
	constructor to read a (single sliced) archive from a pipe More...

	trivial_sar (const std::shared_ptr< user_interaction > &dialog, int filedescriptor, bool lax)

	trivial_sar (const std::shared_ptr< user_interaction > &dialog, generic_file *f, const label &internal_name, const label &data_name, bool format_07_compatible, const std::string &execute)
	constructor to write a (single sliced) archive to a anonymous pipe More...

	trivial_sar (const trivial_sar &ref)=delete
	copy constructor (disabled)

	trivial_sar (trivial_sar &&ref) noexcept=delete
	move constructor

trivial_sar &	operator= (const trivial_sar &ref)=delete
	assignment operator (disabled)

trivial_sar &	operator= (trivial_sar &&ref) noexcept=delete
	move operator

	~trivial_sar ()
	destructor

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

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

virtual bool	skip_to_eof () override
	skip to the end of file

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

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

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

virtual bool	is_an_old_start_end_archive () const override
	returns whether the archive is a old archive (format < 8)

virtual const label &	get_data_name () const override
	obtain the data_name of the archive (label associated with the archive's data) More...

const infinint &	get_slice_header_size () const
	size of the slice header

void	disable_natural_destruction ()
	disable execution of user command when destroying the current object

void	enable_natural_destruction ()
	enable back execution of user command when destroying the current object

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

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::contextual
	contextual (const contextual &ref)=default

	contextual (contextual &&ref) noexcept=default

contextual &	operator= (const contextual &ref)=default

contextual &	operator= (contextual &&ref) noexcept=default

virtual void	set_info_status (const std::string &s)
	defines the new contextual value More...

virtual std::string	get_info_status () const
	get the current contextual value

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

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

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

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

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

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

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

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

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

	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...

Private Member Functions
void	init (const label &internal_name)
	write the slice header and set the offset field (write mode), or (read-mode), reads the slice header an set offset field

void	where_am_i ()

Private Attributes
generic_file *	reference
	points to the underlying data, owned by "this"

infinint	offset
	offset to apply to get the first byte of data out of SAR headers

infinint	cur_pos
	current position as returned by get_position()

infinint	end_of_slice
	when end of slice/archive is met, there is an offset by 1 compared to the offset of reference. end_of_slice is set to 1 in that situation, else it is always equal to zero

std::string	hook
	command to execute after slice writing (not used in read-only mode)

std::string	base
	basename of the archive (used for string susbstitution in hook)

std::string	ext
	extension of the archive (used for string substitution in hook)

label	of_data_name
	archive's data name

bool	old_sar
	true if the read sar has an old header (format <= "07") or the to be written must keep a version 07 format.

infinint	min_digits
	minimum number of digits in slice name

std::string	hook_where
	what value to use for p substitution in hook

std::string	base_url
	what value to use for u substitution in hook

bool	natural_destruction
	whether user command is executed once the single sliced archive is completed (disable upon user interaction)

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

Detailed Description

"trivial sar" proposes the same interface a sar but does the work slightly differently using different constructors

depending on the constructor used trivial sar can:

in write mode send the data to a arbitrary long slice (plain file)
in read mode let read a single slice from a named pipe
in write mode let write a single sliced archive to an anonymous pipe

Definition at line 53 of file trivial_sar.hpp.

Constructor & Destructor Documentation

◆ trivial_sar() [1/4]

libdar::trivial_sar::trivial_sar	(	const std::shared_ptr< user_interaction > &	dialog,
		gf_mode	open_mode,
		const std::string &	base_name,
		const std::string &	extension,
		const entrepot &	where,
		const label &	internal_nale,
		const label &	data_name,
		const std::string &	execute,
		bool	allow_over,
		bool	warn_over,
		bool	force_permission,
		U_I	permission,
		hash_algo	x_hash,
		const infinint &	min_digits,
		bool	format_07_compatible
	)

constructor to build a new single sliced archive

Parameters

dialog	how to interact with the user
open_mode	read_write or write_only are the only acceptable values
base_name	archive basename to create
extension	archive extension
where	where to store the archive
internal_nale	tag common to all slices of the archive
data_name	tag that follows the data when archive is dar_xform'ed
execute	command line to execute at end of slice creation
allow_over	whether to allow overwriting
warn_over	whether to warn before overwriting
force_permission	whether to enforce slice permission or not
permission	value of permission to use if permission enforcement is used
x_hash	whether to build a hash of the slice, and which algo to use for that
min_digits	is the minimum number of digits the slices number is stored with in the filename
format_07_compatible	build a slice header backward compatible with 2.3.x

◆ trivial_sar() [2/4]

libdar::trivial_sar::trivial_sar	(	const std::shared_ptr< user_interaction > &	dialog,
		const std::string &	pipename,
		bool	lax
	)

constructor to read a (single sliced) archive from a pipe

Parameters

dialog	how to interact with the user
pipename	if set to '-' the data are read from standard input, else the given file is expected to be named pipe to read data from
lax	whether to be laxist or follow the normal and strict controlled procedure

◆ trivial_sar() [3/4]

libdar::trivial_sar::trivial_sar	(	const std::shared_ptr< user_interaction > &	dialog,
		int	filedescriptor,
		bool	lax
	)

Parameters

dialog	how to interact with the user
filedescriptor	if set to '-' the data are read from standard input, else the given file is expected to be named pipe to read data from
lax	whether to be laxist or follow the normal and strict controlled procedure

◆ trivial_sar() [4/4]

libdar::trivial_sar::trivial_sar	(	const std::shared_ptr< user_interaction > &	dialog,
		generic_file *	f,
		const label &	internal_name,
		const label &	data_name,
		bool	format_07_compatible,
		const std::string &	execute
	)

constructor to write a (single sliced) archive to a anonymous pipe

Parameters

dialog	user interaction
f	in case of exception the generic_file "f" is not released, this is the duty of the caller to do so, else (success), the object becomes owned by the trivial_sar and must not be released by the caller.
internal_name	internal name ti use
data_name	data name
format_07_compatible	whether we have to avoid creating a slice trailer
execute	command to execute after each slice

Member Function Documentation

◆ get_data_name()

virtual const label& libdar::trivial_sar::get_data_name ( ) const

inlineoverridevirtual

obtain the data_name of the archive (label associated with the archive's data)

Note: label are conserved with dar_xform and archive isolation, but are not with archive merging or archive creation (full or differential backup)

Implements libdar::contextual.

Definition at line 119 of file trivial_sar.hpp.

References of_data_name.

◆ inherited_flush_read()

virtual void libdar::trivial_sar::inherited_flush_read ( )

inlineoverrideprotectedvirtual

reset internal engine, flush caches in order to read the data at current position

Note: when the object relies on external object or system object to fetch the data from for reading, when a call to (inherited_)flush_read() occurs, the current object must not assume that any previously read data is still valid if it has internal buffers or the like and it should flush them asap. This call must not propagate the flush_read to any other gneric_file object it could rely on

Implements libdar::generic_file.

Definition at line 136 of file trivial_sar.hpp.

References libdar::generic_file::flush_read(), and reference.

◆ inherited_read()

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

overrideprotectedvirtual

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_read_ahead()

virtual void libdar::trivial_sar::inherited_read_ahead ( const infinint & amount )

inlineoverrideprotectedvirtual

tells the object that several calls to read() will follow to probably obtain at least the given amount of data

Parameters

[in] amount is the maximum expected amount of data that is known to be read

Note: this call may be implemented as a do-nothing call, its presence is only to allow optimization when possible, like in multi-threaded environment

Implements libdar::generic_file.

Definition at line 131 of file trivial_sar.hpp.

References libdar::generic_file::read_ahead(), and reference.

◆ inherited_sync_write()

virtual void libdar::trivial_sar::inherited_sync_write ( )

inlineoverrideprotectedvirtual

write down any pending data

Note: called after sanity checks from generic_file::sync_write() this method's role is to write down any data pending for writing in the current object it has not to be propagated to other gneric_file object this object could rely on

Implements libdar::generic_file.

Definition at line 135 of file trivial_sar.hpp.

References reference, and libdar::generic_file::sync_write().

◆ inherited_terminate()

virtual void libdar::trivial_sar::inherited_terminate ( )

overrideprotectedvirtual

destructor-like call, except that it is allowed to throw exceptions

Note: this method must never be called directly but using terminate() instead, generic_file class manages it to never be called more than once

Implements libdar::generic_file.

◆ inherited_truncate()

virtual void libdar::trivial_sar::inherited_truncate ( const infinint & pos )

inlineoverrideprotectedvirtual

truncate file at the give offset

Note: if pos is greater than the current file size, this call may do nothing (not even enlarging the file); this call should always fail on a read-only generic_file; implementation must throw exception if truncate is not possible for other reason than read/write access mode

Implements libdar::generic_file.

Definition at line 134 of file trivial_sar.hpp.

References cur_pos, offset, reference, and libdar::generic_file::truncate().

◆ inherited_write()

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

overrideprotectedvirtual

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.

◆ skip()

virtual bool libdar::trivial_sar::skip ( const infinint & pos )

overridevirtual

skip at the absolute position

Parameters

[in] pos the offset in byte where next read/write operation must start

Returns: true if operation was successfull and false if the requested position is not valid (after end of file)

Note: if requested position is not valid the reading/writing cursor must be set to the closest valid position

Implements libdar::generic_file.

◆ skippable()

virtual bool libdar::trivial_sar::skippable	(	skippability	direction,
		const infinint &	amount
	)

inlineoverridevirtual

whether the implementation is able to skip

Note: the capability to skip does not mean that skip_relative() or skip() will succeed, but rather that the inherited class implementation does not by construction forbid the requested skip (like inherited class providing a generic_file interface of an anonymous pipe for example)

Implements libdar::generic_file.

Definition at line 110 of file trivial_sar.hpp.

References reference, and libdar::generic_file::skippable().

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

trivial_sar.hpp

Public Member Functions

Protected Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ trivial_sar() [1/4]

◆ trivial_sar() [2/4]

◆ trivial_sar() [3/4]

◆ trivial_sar() [4/4]

Member Function Documentation

◆ get_data_name()

◆ inherited_flush_read()

◆ inherited_read()

◆ inherited_read_ahead()

◆ inherited_sync_write()

◆ inherited_terminate()

◆ inherited_truncate()

◆ inherited_write()

◆ skip()

◆ skippable()