swh:1:snp:61dcfc0dd5674a0e65803e88039c122d9532074e
Tip revision: b51dcc2018d5ef05049ecd0c1e661cce0b950660 authored by Raphaƫl Proust on 21 November 2019, 00:26:07 UTC
Port commit 7f0319d2 from down-stream repository
Port commit 7f0319d2 from down-stream repository
Tip revision: b51dcc2
binary_length.ml
(*****************************************************************************)
(* *)
(* Open Source License *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com> *)
(* *)
(* Permission is hereby granted, free of charge, to any person obtaining a *)
(* copy of this software and associated documentation files (the "Software"),*)
(* to deal in the Software without restriction, including without limitation *)
(* the rights to use, copy, modify, merge, publish, distribute, sublicense, *)
(* and/or sell copies of the Software, and to permit persons to whom the *)
(* Software is furnished to do so, subject to the following conditions: *)
(* *)
(* The above copyright notice and this permission notice shall be included *)
(* in all copies or substantial portions of the Software. *)
(* *)
(* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR*)
(* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *)
(* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *)
(* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER*)
(* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *)
(* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *)
(* DEALINGS IN THE SOFTWARE. *)
(* *)
(*****************************************************************************)
open Binary_error
let n_length value =
let bits = Z.numbits value in
if bits = 0 then 1 else (bits + 6) / 7
let z_length value = (Z.numbits value + 1 + 6) / 7
let rec length : type x. x Encoding.t -> x -> int =
fun e value ->
let open Encoding in
match e.encoding with
(* Fixed *)
| Null ->
0
| Empty ->
0
| Constant _ ->
0
| Bool ->
Binary_size.bool
| Int8 ->
Binary_size.int8
| Uint8 ->
Binary_size.uint8
| Int16 ->
Binary_size.int16
| Uint16 ->
Binary_size.uint16
| Int31 ->
Binary_size.int31
| Int32 ->
Binary_size.int32
| Int64 ->
Binary_size.int64
| N ->
n_length value
| Z ->
z_length value
| RangedInt {minimum; maximum} ->
Binary_size.integer_to_size
@@ Binary_size.range_to_size ~minimum ~maximum
| Float ->
Binary_size.float
| RangedFloat _ ->
Binary_size.float
| Bytes (`Fixed n) ->
n
| String (`Fixed n) ->
n
| Padded (e, n) ->
length e value + n
| String_enum (_, arr) ->
Binary_size.integer_to_size @@ Binary_size.enum_size arr
| Objs {kind = `Fixed n; _} ->
n
| Tups {kind = `Fixed n; _} ->
n
| Union {kind = `Fixed n; _} ->
n
(* Dynamic *)
| Objs {kind = `Dynamic; left; right} ->
let (v1, v2) = value in
length left v1 + length right v2
| Tups {kind = `Dynamic; left; right} ->
let (v1, v2) = value in
length left v1 + length right v2
| Union {kind = `Dynamic; tag_size; cases} ->
let rec length_case = function
| [] ->
raise (Write_error No_case_matched)
| Case {tag = Json_only; _} :: tl ->
length_case tl
| Case {encoding = e; proj; _} :: tl -> (
match proj value with
| None ->
length_case tl
| Some value ->
Binary_size.tag_size tag_size + length e value )
in
length_case cases
| Mu {kind = `Dynamic; fix; _} ->
length (fix e) value
| Obj (Opt {kind = `Dynamic; encoding = e; _}) -> (
match value with None -> 1 | Some value -> 1 + length e value )
(* Variable *)
| Ignore ->
0
| Bytes `Variable ->
Bytes.length value
| String `Variable ->
String.length value
| Array (Some max_length, _e) when Array.length value > max_length ->
raise (Write_error Array_too_long)
| Array (_, e) ->
Array.fold_left (fun acc v -> length e v + acc) 0 value
| List (Some max_length, _e) when List.length value > max_length ->
raise (Write_error List_too_long)
| List (_, e) ->
List.fold_left (fun acc v -> length e v + acc) 0 value
| Objs {kind = `Variable; left; right} ->
let (v1, v2) = value in
length left v1 + length right v2
| Tups {kind = `Variable; left; right} ->
let (v1, v2) = value in
length left v1 + length right v2
| Obj (Opt {kind = `Variable; encoding = e; _}) -> (
match value with None -> 0 | Some value -> length e value )
| Union {kind = `Variable; tag_size; cases} ->
let rec length_case = function
| [] ->
raise (Write_error No_case_matched)
| Case {tag = Json_only; _} :: tl ->
length_case tl
| Case {encoding = e; proj; _} :: tl -> (
match proj value with
| None ->
length_case tl
| Some value ->
Binary_size.tag_size tag_size + length e value )
in
length_case cases
| Mu {kind = `Variable; fix; _} ->
length (fix e) value
(* Recursive*)
| Obj (Req {encoding = e; _}) ->
length e value
| Obj (Dft {encoding = e; _}) ->
length e value
| Tup e ->
length e value
| Conv {encoding = e; proj; _} ->
length e (proj value)
| Describe {encoding = e; _} ->
length e value
| Splitted {encoding = e; _} ->
length e value
| Dynamic_size {kind; encoding = e} ->
let length = length e value in
Binary_size.integer_to_size kind + length
| Check_size {limit; encoding = e} ->
let length = length e value in
if length > limit then raise (Write_error Size_limit_exceeded) ;
length
| Delayed f ->
length (f ()) value
let fixed_length e =
match Encoding.classify e with
| `Fixed n ->
Some n
| `Dynamic | `Variable ->
None
let fixed_length_exn e =
match fixed_length e with
| Some n ->
n
| None ->
invalid_arg "Data_encoding.Binary.fixed_length_exn"