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An embedded, single-file key-value store for OCaml, inspired by BoltDB and LMDB.
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849(** Core types for Lithos *)
type ro
type rw
type page_id = int64
type metadata = { version : int ; page_size : int ; root_bucket : page_id option }
type txn_state = | Active | Committed | Rolled_back
type key = bytes
type value = (char, Bigarray.int8_unsigned_elt, Bigarray.c_layout) Bigarray.Array1.t
let key_of_string s = Bytes.of_string s
let string_of_key k = Bytes.to_string k
let value_of_bytes b = let len = Bytes.length b in let arr = Bigarray.Array1.create Bigarray.char Bigarray.c_layout len in for i = 0 to len - 1 do Bigarray.Array1.set arr i (Bytes.get b i) done; arr;;
let bytes_of_value v = let len = Bigarray.Array1.dim v in let b = Bytes.create len in for i = 0 to len - 1 do Bytes.set b i (Bigarray.Array1.get v i) done; b;;
let value_of_string s = value_of_bytes (Bytes.of_string s)
let string_of_value v = Bytes.to_string (bytes_of_value v)