syncthing/vendor/github.com/chmduquesne/rollinghash/rollinghash.go
Audrius Butkevicius 29d010ec0e lib/model, lib/weakhash: Hash using adler32, add heuristic in puller
Adler32 is much faster, and the heuristic avoid the obvious cases where it
will not help.

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3872
2017-01-04 21:04:13 +00:00

41 lines
1.0 KiB
Go

/*
Package rollinghash implements rolling versions of some hashes
*/
package rollinghash
import "hash"
type Roller interface {
// Roll updates the hash of a rolling window from the entering byte.
// A copy of the window is internally kept from the last Write().
// This copy is updated along with the internal state of the checksum
// in order to determine the new hash very quickly.
Roll(b byte)
}
// rollinghash.Hash extends hash.Hash by adding the method Roll. A
// rollinghash.Hash can be updated byte by byte, by specifying which byte
// enters the window.
type Hash interface {
hash.Hash
Roller
}
// rollinghash.Hash32 extends hash.Hash by adding the method Roll. A
// rollinghash.Hash32 can be updated byte by byte, by specifying which
// byte enters the window.
type Hash32 interface {
hash.Hash32
Roller
}
// rollinghash.Hash64 extends hash.Hash by adding the method Roll. A
// rollinghash.Hash64 can be updated byte by byte, by specifying which
// byte enters the window.
type Hash64 interface {
hash.Hash64
Roller
}