74 lines
2.8 KiB
OCaml
74 lines
2.8 KiB
OCaml
(*****************************************************************************)
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(* *)
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(* Open Source License *)
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(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com> *)
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(* *)
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(* Permission is hereby granted, free of charge, to any person obtaining a *)
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(* copy of this software and associated documentation files (the "Software"),*)
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(* to deal in the Software without restriction, including without limitation *)
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(* the rights to use, copy, modify, merge, publish, distribute, sublicense, *)
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(* and/or sell copies of the Software, and to permit persons to whom the *)
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(* Software is furnished to do so, subject to the following conditions: *)
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(* *)
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(* The above copyright notice and this permission notice shall be included *)
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(* in all copies or substantial portions of the Software. *)
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(* *)
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(* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR*)
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(* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *)
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(* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *)
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(* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER*)
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(* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *)
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(* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *)
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(* DEALINGS IN THE SOFTWARE. *)
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(* *)
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(*****************************************************************************)
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(* let re_trailing_null =
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Re_pcre.regexp "^(.*?)\000*$"
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let remove_trailing_null s =
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Re.get (Re.exec re_trailing_null s) 1 *)
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let remove_trailing_null s =
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let n = String.length s in
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let i = ref (n-1) in
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while (!i >= 0) && (String.get s !i = '\000') do
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i := !i - 1
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done; String.sub s 0 (!i+1)
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let serialize z =
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let n =
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if Z.(lt z zero) then
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Z.(neg (add (add z z) one))
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else
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Z.(add z z)
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in
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n |> Z.to_bits |> remove_trailing_null
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let deserialize z =
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let n = Z.of_bits z in
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let z = Z.shift_right_trunc n 1 in
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if Z.(n land one = zero) then z else Z.neg z
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let leq a b = (Z.compare a b) <= 0
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let geq a b = (Z.compare a b) >= 0
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let lt a b = (Z.compare a b) < 0
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let gt a b = (Z.compare a b) > 0
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let (<) = lt
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let (>) = gt
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let (<=) = leq
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let (>=) = geq
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let zero = Z.zero
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let one = Z.one
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let invert a n =
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try
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Some (Z.invert a n)
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with
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Division_by_zero -> None
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