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Object hashes.
Signature for digest hashes, inspired by Digestif.
type t = hash
The type for digest hashes.
val hash : ((string -> unit) -> unit) -> t
Compute a deterministic store key from a sequence of strings.
val short_hash : t -> int
short_hash h
is a small hash of h
, to be used for instance as the `hash` function of an OCaml Hashtbl
.
val to_raw_string : t -> string
to_raw_string t
is the raw sequence of bytes in t
(of length hash_size
).
val unsafe_of_raw_string : string -> t
unsafe_of_raw_string b
is the hash consisting of the raw sequence of bytes b
.
Warning: this function cannot guarantee that the supplied byte string is a valid output of the hash process, so should only be used on strings that are known to have been built with to_raw_string
.
val short_hash_substring : Bigstringaf.t -> off:int -> int
short_hash_substring t off
computes the short-hash of the raw hash data contained in t
at offset off
. It has behaviour equivalent to:
Bigstringaf.substring t ~off ~len:hash_size
|> unsafe_of_raw_string
|> short_hash
but may be more efficient due to not needing to allocate an intermediate string
.
val t : t Irmin.Type.t
t
is the value type for t
.