libdar::delta_sig_block_size Struct Reference

defines how to calculate delta signature block size based of file size to delta sign More...

#include <delta_sig_block_size.hpp>

Collaboration diagram for libdar::delta_sig_block_size:

Public Types
enum	fs_function_t {   fixed , linear , log2 , square2 ,   square3 }
	defines the function to use to derivate block size from file size More...

Public Member Functions
	delta_sig_block_size (const delta_sig_block_size &ref)=default
	set the structure to defaults value
	delta_sig_block_size (delta_sig_block_size &&ref) noexcept=default
delta_sig_block_size &	operator= (const delta_sig_block_size &ref)=default
delta_sig_block_size &	operator= (delta_sig_block_size &&ref) noexcept=default
bool	operator== (const delta_sig_block_size &ref) const
void	reset ()
	reset to default value
bool	equals_default ()
	whether structure has default values
void	check () const
	check the sanity of the provided values
U_I	calculate (const infinint &filesize) const
	calculate the value of the block size given the file size More...

Public Attributes
fs_function_t	fs_function
infinint	multiplier
	function dependently used multiplier
infinint	divisor
	function dependently used divisor
U_I	min_block_len
	calculated block len will never be lower than that
U_I	max_block_len
	calculated block len will never be higer than that except if this field is set to zero (disabling this ceiling check)

Detailed Description

defines how to calculate delta signature block size based of file size to delta sign

Note

the global formula is block_size = multiplicator/divisor*fs_function(filesize)

of course, divisor cannot be null

Definition at line 46 of file delta_sig_block_size.hpp.

Member Enumeration Documentation

fs_function_t

enum libdar::delta_sig_block_size::fs_function_t

defines the function to use to derivate block size from file size

Enumerator
fixed	block size is independant from file size
linear	block size if proportionnal to file size
log2	block size is proportional to log2(file size)
square2	block size is proportional to filesize^2
square3	block size if proportional to filesize^3

Definition at line 49 of file delta_sig_block_size.hpp.

Member Function Documentation

calculate()

U_I libdar::delta_sig_block_size::calculate

(

const infinint &

filesize

)

const

calculate the value of the block size given the file size

Parameters

[in]

filesize

is the size of the file which delta signature to be calculated

Returns

the block len to use for delta signature

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

• delta_sig_block_size.hpp