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Public Member Functions | Static Public Member Functions | Private Member Functions | Private Attributes | List of all members
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 More...

## 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.

## Member Function Documentation

## ◆ min_size()

static 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.

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

- header.hpp