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Public Member Functions | Protected Member Functions | Private Member Functions | Private Attributes | List of all members
libdar::trivial_sar Class Reference
Private

`#include <trivial_sar.hpp>`

Inherits libdar::generic_file, libdar::contextual, and libdar::mem_ui.

## 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 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 | 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_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 is 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
| inline override virtual

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 118 of file trivial_sar.hpp.

References of_data_name.

## ◆ inherited_flush_read()

virtual void libdar::trivial_sar::inherited_flush_read | ( |  | ) |
| inline override protected virtual

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 134 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
| ) |  |
| override protected virtual

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 | ) |
| inline override protected virtual

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 130 of file trivial_sar.hpp.

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

## ◆ inherited_sync_write()

virtual void libdar::trivial_sar::inherited_sync_write | ( |  | ) |
| inline override protected virtual

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 133 of file trivial_sar.hpp.

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

## ◆ inherited_terminate()

virtual void libdar::trivial_sar::inherited_terminate | ( |  | ) |
| override protected virtual

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_write()

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

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 | ) |
| override virtual

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
| ) |  |
| inline override virtual

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