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libdar::hash_fichier Class Reference
Private

manages the generation of a hash More...

`#include <hash_fichier.hpp>`

Inherits libdar::fichier_global.

## Public Member Functions

| hash_fichier (const std::shared_ptr< user_interaction > &dialog, fichier_global *under, const std::string &under_filename, fichier_global *hash_file, hash_algo algo)
| hash_fichier (const hash_fichier &ref)=delete
| copy constructor
| hash_fichier (hash_fichier &&ref) noexcept=delete
| move constructor
hash_fichier & | operator= (const hash_fichier &ref)=delete
| assignment operator
hash_fichier & | operator= (hash_fichier &&ref) noexcept=delete
| move operator
| ~hash_fichier ()
| destructor
virtual void | change_ownership (const std::string &user, const std::string &group) override
| set the ownership of the file
virtual void | change_permission (U_I perm) override
| change the permission of the file
virtual infinint | get_size () const override
| return the size of the file
virtual void | fadvise (advise adv) const override
| set posix_fadvise for the whole file
virtual bool | skippable (skippability direction, const infinint &amount) override
| whether the implementation is able to skip
virtual bool | skip (const infinint &pos) override
| skip at the absolute position
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
void | set_only_hash ()
| for debugging purposes only
Public Member Functions inherited from libdar::fichier_global
| fichier_global (const std::shared_ptr< user_interaction > &dialog, gf_mode mode)
| constructor
| 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
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,
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
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
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
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
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
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
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
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.
void | block_delayed_cancellation (bool mode)
Public Member Functions inherited from libdar::mem_ui
| mem_ui (const std::shared_ptr< user_interaction > &dialog)
| constructor
| mem_ui (const mem_ui &ref)=default
| the copy constructor
| mem_ui (mem_ui &&ref) noexcept=default
| the move constructor
mem_ui & | operator= (const mem_ui &ref)=default
| assignement operator
mem_ui & | operator= (mem_ui &&ref) noexcept=default
| move operator
virtual | ~mem_ui () noexcept(false)
| destructor

## 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
virtual U_I | fichier_global_inherited_write (const char *a, U_I size) override
| replaces generic_file::inherited_write() method, to allow the return of partial writings
virtual bool | fichier_global_inherited_read (char *a, U_I size, U_I &read, std::string &message) override
| replaces generic_file::inherited_read() method, to allow the return of partial reading
virtual void | inherited_truncate (const infinint &pos) override
| truncate file at the give offset
virtual void | inherited_sync_write () override
| write down any pending data
virtual void | inherited_flush_read () override
| reset internal engine, flush caches in order to read the data at current position
virtual void | inherited_terminate () override
| destructor-like call, except that it is allowed to throw exceptions
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
std::shared_ptr< user_interaction > | get_pointer () const
| get access to the shared_ptr pointing to the user_interaction

## Private Attributes

fichier_global * | ref
fichier_global * | hash_ref
bool | only_hash
| if set, avoids copying data to file, only compute hash (debugging purpose)
std::string | ref_filename
U_I | hash_gcrypt
bool | eof
bool | hash_dumped

## Additional Inherited Members

Public Types inherited from libdar::fichier_global
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 }
Static Public Member Functions inherited from libdar::thread_cancellation
static U_I | count ()
| method for debugging/control purposes

## Detailed Description

manages the generation of a hash

Definition at line 59 of file hash_fichier.hpp.

## Constructor & Destructor Documentation

## hash_fichier()

libdar::hash_fichier::hash_fichier | ( | const std::shared_ptr< user_interaction > & | dialog,
|  | fichier_global * | under,
|  | const std::string & | under_filename,
|  | fichier_global * | hash_file,
|  | hash_algo | algo
| ) |  |

hash_file constructor

Parameters

  [in] | dialog | for user interaction
  [in] | under | points to an object where to write data to
  [in] | under_filename | name of the plain file we write to, this argument is required to build the hash file
  [in] | hash_file | points to an object where to drop the hash file once writings are finished
  [in] | algo | hash algorithm to use. hash_none is not an acceptable value

Note
  if the constructor succeed, the objects pointed to by under and hash_file are owned and deleted by this hash_file object

## Member Function Documentation

## change_ownership()

virtual void libdar::hash_fichier::change_ownership | ( | const std::string & | user,
|  | const std::string & | group
| ) |  |

inline override virtual

set the ownership of the file

Implements libdar::fichier_global.

Definition at line 94 of file hash_fichier.hpp.

References libdar::fichier_global::change_ownership().

## change_permission()

virtual void libdar::hash_fichier::change_permission | ( | U_I | perm | ) |

inline override virtual

change the permission of the file

Implements libdar::fichier_global.

Definition at line 95 of file hash_fichier.hpp.

References libdar::fichier_global::change_permission().

## fadvise()

virtual void libdar::hash_fichier::fadvise | ( | advise | adv | ) | const

inline override virtual

set posix_fadvise for the whole file

Implements libdar::fichier_global.

Definition at line 97 of file hash_fichier.hpp.

References libdar::fichier_global::fadvise().

## fichier_global_inherited_read()

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

override protected 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.

Implements libdar::fichier_global.

## fichier_global_inherited_write()

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

override protected 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

Implements libdar::fichier_global.

## get_position()

virtual infinint libdar::hash_fichier::get_position | ( |  | ) | const

inline override virtual

get the current read/write position

Implements libdar::generic_file.

Definition at line 105 of file hash_fichier.hpp.

References libdar::generic_file::get_position().

## get_size()

virtual infinint libdar::hash_fichier::get_size | ( |  | ) | const

inline override virtual

return the size of the file

Implements libdar::fichier_global.

Definition at line 96 of file hash_fichier.hpp.

References libdar::fichier_global::get_size().

## inherited_flush_read()

virtual void libdar::hash_fichier::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 119 of file hash_fichier.hpp.

## inherited_read_ahead()

virtual void libdar::hash_fichier::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 112 of file hash_fichier.hpp.

References libdar::generic_file::read_ahead().

## inherited_sync_write()

virtual void libdar::hash_fichier::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 118 of file hash_fichier.hpp.

## inherited_terminate()

virtual void libdar::hash_fichier::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_truncate()

virtual void libdar::hash_fichier::inherited_truncate | ( | const infinint & | pos | ) |

inline override protected virtual

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 117 of file hash_fichier.hpp.

## set_only_hash()

void libdar::hash_fichier::set_only_hash | ( |  | ) |

inline

for debugging purposes only

Definition at line 108 of file hash_fichier.hpp.

References only_hash.

## skip()

virtual bool libdar::hash_fichier::skip | ( | const infinint & | pos | ) |

inline 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.

Definition at line 101 of file hash_fichier.hpp.

References libdar::generic_file::get_position().

## skip_relative()

virtual bool libdar::hash_fichier::skip_relative | ( | S_I | x | ) |

inline override virtual

skip relatively to the current position

Implements libdar::generic_file.

Definition at line 103 of file hash_fichier.hpp.

## skip_to_eof()

virtual bool libdar::hash_fichier::skip_to_eof | ( |  | ) |

inline override virtual

skip to the end of file

Implements libdar::generic_file.

Definition at line 102 of file hash_fichier.hpp.

References libdar::generic_file::get_mode(), and libdar::gf_write_only.

## skippable()

virtual bool libdar::hash_fichier::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 100 of file hash_fichier.hpp.

## truncatable()

virtual bool libdar::hash_fichier::truncatable | ( | const infinint & | pos | ) | const

inline override virtual

whether the implementation is able to truncate to the given position

Implements libdar::generic_file.

Definition at line 104 of file hash_fichier.hpp.

## Member Data Documentation

## eof

bool libdar::hash_fichier::eof

private

Definition at line 131 of file hash_fichier.hpp.

## hash_dumped

bool libdar::hash_fichier::hash_dumped

private

Definition at line 132 of file hash_fichier.hpp.

## hash_gcrypt

U_I libdar::hash_fichier::hash_gcrypt

private

Definition at line 130 of file hash_fichier.hpp.

## hash_ref

fichier_global* libdar::hash_fichier::hash_ref

private

Definition at line 124 of file hash_fichier.hpp.

## only_hash

bool libdar::hash_fichier::only_hash

private

if set, avoids copying data to file, only compute hash (debugging purpose)

Definition at line 125 of file hash_fichier.hpp.

Referenced by set_only_hash().

## ref

fichier_global* libdar::hash_fichier::ref

private

Definition at line 123 of file hash_fichier.hpp.

## ref_filename

std::string libdar::hash_fichier::ref_filename

private

Definition at line 129 of file hash_fichier.hpp.

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

- hash_fichier.hpp