b6449cae87
* `lib_stdlib`: basic extended OCaml stdlib and generic data structures
* `lib_data_encoding`: almost independant 'Data_encoding'
* `lib_error_monad`: almost independant 'Error_monad'
* `lib_stdlib_lwt`: extended Lwt library
* `lib_crypto`: all the crypto stuff (hashing, signing, cryptobox).
* `lib_base`:
- basic type definitions (Block_header, Operation, ...)
- a module `TzPervasives` to bind them all and to be the
single module opened everywhere.
In the process, I splitted `Tezos_data` and `Hash` in multiple
submodules, thus removing a lot of `-open`.
The following two modules may not have found their place yet:
- Base58 (currently in `lib_crypto`)
- Cli_entries (currently in `lib_stdlib_lwt`)
50 lines
1.9 KiB
OCaml
50 lines
1.9 KiB
OCaml
(**************************************************************************)
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(* *)
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(* Copyright (c) 2014 - 2017. *)
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(* Dynamic Ledger Solutions, Inc. <contact@tezos.com> *)
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(* *)
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(* All rights reserved. No warranty, explicit or implicit, provided. *)
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(* *)
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(**************************************************************************)
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(* Tezos Utility library - Hexadecimal encoding *)
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(* From OCaml's stdlib. See [Digest.to_hex], and [hex_of_bytes], [hex_encode]
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below for examples. *)
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let gen_encode length get s =
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let n = length s in
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let result = Bytes.create (n*2) in
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for i = 0 to n-1 do
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Bytes.blit_string (Printf.sprintf "%02x" (get s i)) 0 result (2*i) 2;
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done;
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Bytes.unsafe_to_string result
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let hex_of_bytes = gen_encode MBytes.length MBytes.get_uint8
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let hex_encode = gen_encode String.length (fun s i -> int_of_char s.[i])
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(* From OCaml's stdlib. See [Digest.from_hex], and [hex_decode], [bytes_of_hex]
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below for examples. *)
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let gen_decode create set h =
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let n = String.length h in
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if n mod 2 <> 0 then invalid_arg ("hex_decode: " ^ h);
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let digit c =
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match c with
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| '0'..'9' -> int_of_char c - int_of_char '0'
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| 'A'..'F' -> int_of_char c - int_of_char 'A' + 10
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| 'a'..'f' -> int_of_char c - int_of_char 'a' + 10
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| _c -> invalid_arg ("hex_decode: " ^ h)
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in
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let byte i = digit h.[i] lsl 4 + digit h.[i+1] in
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let result = create (n / 2) in
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for i = 0 to n/2 - 1 do
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set result i (byte (2 * i));
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done;
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result
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let hex_decode s =
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gen_decode Bytes.create (fun s i c -> Bytes.set s i (char_of_int c)) s |>
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Bytes.unsafe_to_string
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let bytes_of_hex s =
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gen_decode MBytes.create MBytes.set_int8 s
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