fingerprint

Documentation

Index

• Constants
• type Fingerprint
  • func New(file *os.File, size int) (*Fingerprint, error)
  • func (f Fingerprint) Copy() *Fingerprint
  • func (f Fingerprint) Equal(other *Fingerprint) bool
  • func (f Fingerprint) StartsWith(old *Fingerprint) bool

Constants

const DefaultSize = 1000 // bytes

const MinSize = 16 // bytes

Types

type Fingerprint

type Fingerprint struct {
	FirstBytes []byte
}

Fingerprint is used to identify a file A file's fingerprint is the first N bytes of the file

func New

func New(file *os.File, size int) (*Fingerprint, error)

New creates a new fingerprint from an open file

func (Fingerprint) Copy

func (f Fingerprint) Copy() *Fingerprint

Copy creates a new copy of the fingerprint

func (Fingerprint) Equal

func (f Fingerprint) Equal(other *Fingerprint) bool

Equal returns true if the fingerprints have the same FirstBytes, false otherwise. This does not compare other aspects of the fingerprints because the primary purpose of a fingerprint is to convey a unique identity, and only the FirstBytes field contributes to this goal.

func (Fingerprint) StartsWith

func (f Fingerprint) StartsWith(old *Fingerprint) bool

StartsWith returns true if the fingerprints are the same or if the new fingerprint starts with the old one This is important functionality for tracking new files, since their initial size is typically less than that of a fingerprint. As the file grows, its fingerprint is updated until it reaches a maximum size, as configured on the operator