mirror of
https://github.com/octoleo/syncthing.git
synced 2024-11-10 15:20:56 +00:00
29d010ec0e
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
41 lines
1.0 KiB
Go
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
|
|
}
|