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libdar::header Class Reference
Private

this class manages the header of each slice More...

`#include <header.hpp>`

## Public Member Functions

| header (const header &ref)
| header (header &&ref) noexcept
header & | operator= (const header &ref)
header & | operator= (header &&ref) noexcept
void | read (user_interaction &ui, generic_file &f, bool lax=false)
void | write (user_interaction &, generic_file &f) const
magic_number & | get_set_magic ()
label & | get_set_internal_name ()
char & | get_set_flag ()
label & | get_set_data_name ()
bool | get_first_slice_size (infinint &size) const
void | set_first_slice_size (const infinint &size)
void | unset_first_slice_size ()
bool | get_slice_size (infinint &size) const
void | set_slice_size (const infinint &size)
void | unset_slice_size ()
bool | is_old_header () const
void | set_format_07_compatibility ()

## Static Public Member Functions

static U_I | min_size ()
| minimal size of a header in an archive

## Private Member Functions

void | nullifyptr () noexcept
void | copy_from (const header &ref)
void | move_from (header &&ref) noexcept
void | free_pointers ()
void | fill_from (user_interaction &ui, const tlv_list &list)
tlv_list | build_tlv_list (user_interaction &ui) const

## Private Attributes

magic_number | magic
| constant string for all Dar archives
label | internal_name
| constant string for all slices of a given archive (computed based on date and pid)
label | data_name
| constant string for a set of data (constant with dar_xform, used to link isolated catalogue to its original data)
char | flag
| whether slice is the last of the archive or not
infinint * | first_size
| size of the first slice
infinint * | slice_size
| size of slices (except first slice if specified else and last if not fulfilled)
bool | old_header
| true if the header has been read from an old archive (before release 2.4.0, format 07 and below) and if true when writing, create an old slice header (compatible with format 07).

## Detailed Description

this class manages the header of each slice

this class was a struct before release 2.4.0, now promoted to a class it hides the fields and uses TLV to store the fields in the archive. This makes the header easier to extend by adding new fields, while letting a chance for the old implementation to be able to use more recent archives the main use of TLV is to handle optional fields easily.

Definition at line 65 of file header.hpp.

## Constructor & Destructor Documentation

## header() [1/2]

libdar::header::header | ( | const header & | ref | ) |

inline

Definition at line 71 of file header.hpp.

## header() [2/2]

libdar::header::header | ( | header && | ref | ) |

inline noexcept

Definition at line 72 of file header.hpp.

## ~header()

libdar::header::~header | ( |  | ) |

inline

Definition at line 75 of file header.hpp.

## Member Function Documentation

## get_set_data_name()

label & libdar::header::get_set_data_name | ( |  | ) |

inline

Definition at line 99 of file header.hpp.

## get_set_flag()

char & libdar::header::get_set_flag | ( |  | ) |

inline

Definition at line 98 of file header.hpp.

## get_set_internal_name()

label & libdar::header::get_set_internal_name | ( |  | ) |

inline

Definition at line 97 of file header.hpp.

## get_set_magic()

magic_number & libdar::header::get_set_magic | ( |  | ) |

inline

Definition at line 96 of file header.hpp.

## is_old_header()

bool libdar::header::is_old_header | ( |  | ) | const

inline

Definition at line 109 of file header.hpp.

## min_size()

U_I libdar::header::min_size | ( |  | ) |

inline static

minimal size of a header in an archive

Returns
  min size of a header once stored in an archive

Note
  since release 2.4.0 the header used for each slice is exactly the same. before this release the header of the first slice might be bigger, it was known that the size of the other header was "min_size" this let dar be able to find the proper slice for a given position. For compatibility with older DAR format, it is thus important to not change the value returned by this class method. This call is only used when reading archive generated by old versions of dar < 2.4.0. (aka archive format <= 7)

Definition at line 91 of file header.hpp.

## nullifyptr()

void libdar::header::nullifyptr | ( |  | ) |

inline private noexcept

Definition at line 121 of file header.hpp.

## operator=() [1/2]

header & libdar::header::operator= | ( | const header & | ref | ) |

inline

Definition at line 73 of file header.hpp.

## operator=() [2/2]

header & libdar::header::operator= | ( | header && | ref | ) |

inline noexcept

Definition at line 74 of file header.hpp.

## set_format_07_compatibility()

void libdar::header::set_format_07_compatibility | ( |  | ) |

inline

Definition at line 110 of file header.hpp.

## unset_first_slice_size()

void libdar::header::unset_first_slice_size | ( |  | ) |

inline

Definition at line 103 of file header.hpp.

## unset_slice_size()

void libdar::header::unset_slice_size | ( |  | ) |

inline

Definition at line 107 of file header.hpp.

## Member Data Documentation

## data_name

label libdar::header::data_name

private

constant string for a set of data (constant with dar_xform, used to link isolated catalogue to its original data)

Definition at line 115 of file header.hpp.

## first_size

infinint* libdar::header::first_size

private

size of the first slice

Definition at line 117 of file header.hpp.

## flag

char libdar::header::flag

private

whether slice is the last of the archive or not

Definition at line 116 of file header.hpp.

## internal_name

label libdar::header::internal_name

private

constant string for all slices of a given archive (computed based on date and pid)

Definition at line 114 of file header.hpp.

## magic

magic_number libdar::header::magic

private

constant string for all Dar archives

Definition at line 113 of file header.hpp.

## old_header

bool libdar::header::old_header

private

true if the header has been read from an old archive (before release 2.4.0, format 07 and below) and if true when writing, create an old slice header (compatible with format 07).

Definition at line 119 of file header.hpp.

## slice_size

infinint* libdar::header::slice_size

private

size of slices (except first slice if specified else and last if not fulfilled)

Definition at line 118 of file header.hpp.

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

- header.hpp