--- /dev/null
+The MIT License (MIT)
+
+Copyright (c) 2018 base-x contributors
+Copyright (c) 2014-2018 The Bitcoin Core developers
+
+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.
--- /dev/null
+// base-x encoding / decoding
+// Copyright (c) 2018 base-x contributors
+// Copyright (c) 2014-2018 The Bitcoin Core developers (base58.cpp)
+// Distributed under the MIT software license, see the accompanying
+// file LICENSE or http://www.opensource.org/licenses/mit-license.php.
+
+// @ts-ignore
+const _Buffer = require('safe-buffer').Buffer;
+
+function base (ALPHABET: string): base.BaseConverter {
+ if (ALPHABET.length >= 255) throw new TypeError('Alphabet too long')
+
+ const BASE_MAP = new Uint8Array(256)
+ BASE_MAP.fill(255)
+
+ for (let i = 0; i < ALPHABET.length; i++) {
+ const x = ALPHABET.charAt(i)
+ const xc = x.charCodeAt(0)
+
+ if (BASE_MAP[xc] !== 255) throw new TypeError(x + ' is ambiguous')
+ BASE_MAP[xc] = i
+ }
+
+ const BASE = ALPHABET.length
+ const LEADER = ALPHABET.charAt(0)
+ const FACTOR = Math.log(BASE) / Math.log(256) // log(BASE) / log(256), rounded up
+ const iFACTOR = Math.log(256) / Math.log(BASE) // log(256) / log(BASE), rounded up
+
+ function encode (source: Buffer): string {
+ if (!_Buffer.isBuffer(source)) throw new TypeError('Expected Buffer')
+ if (source.length === 0) return ''
+
+ // Skip & count leading zeroes.
+ let zeroes = 0
+ let length = 0
+ let pbegin = 0
+ const pend = source.length
+
+ while (pbegin !== pend && source[pbegin] === 0) {
+ pbegin++
+ zeroes++
+ }
+
+ // Allocate enough space in big-endian base58 representation.
+ const size = ((pend - pbegin) * iFACTOR + 1) >>> 0
+ const b58 = new Uint8Array(size)
+
+ // Process the bytes.
+ while (pbegin !== pend) {
+ let carry = source[pbegin]
+
+ // Apply "b58 = b58 * 256 + ch".
+ let i = 0
+ for (let it1 = size - 1; (carry !== 0 || i < length) && (it1 !== -1); it1--, i++) {
+ carry += (256 * b58[it1]) >>> 0
+ b58[it1] = (carry % BASE) >>> 0
+ carry = (carry / BASE) >>> 0
+ }
+
+ if (carry !== 0) throw new Error('Non-zero carry')
+ length = i
+ pbegin++
+ }
+
+ // Skip leading zeroes in base58 result.
+ let it2 = size - length
+ while (it2 !== size && b58[it2] === 0) {
+ it2++
+ }
+
+ // Translate the result into a string.
+ let str = LEADER.repeat(zeroes)
+ for (; it2 < size; ++it2) str += ALPHABET.charAt(b58[it2])
+
+ return str
+ }
+
+ function decodeUnsafe (source: string): Buffer | undefined {
+ if (typeof source !== 'string') throw new TypeError('Expected String')
+ if (source.length === 0) return _Buffer.alloc(0)
+
+ let psz = 0
+
+ // Skip leading spaces.
+ if (source[psz] === ' ') return
+
+ // Skip and count leading '1's.
+ let zeroes = 0
+ let length = 0
+ while (source[psz] === LEADER) {
+ zeroes++
+ psz++
+ }
+
+ // Allocate enough space in big-endian base256 representation.
+ const size = (((source.length - psz) * FACTOR) + 1) >>> 0 // log(58) / log(256), rounded up.
+ const b256 = new Uint8Array(size)
+
+ // Process the characters.
+ while (source[psz]) {
+ // Decode character
+ let carry = BASE_MAP[source.charCodeAt(psz)]
+
+ // Invalid character
+ if (carry === 255) return
+
+ let i = 0
+ for (let it3 = size - 1; (carry !== 0 || i < length) && (it3 !== -1); it3--, i++) {
+ carry += (BASE * b256[it3]) >>> 0
+ b256[it3] = (carry % 256) >>> 0
+ carry = (carry / 256) >>> 0
+ }
+
+ if (carry !== 0) throw new Error('Non-zero carry')
+ length = i
+ psz++
+ }
+
+ // Skip trailing spaces.
+ if (source[psz] === ' ') return
+
+ // Skip leading zeroes in b256.
+ let it4 = size - length
+ while (it4 !== size && b256[it4] === 0) {
+ it4++
+ }
+
+ const vch = _Buffer.allocUnsafe(zeroes + (size - it4))
+ vch.fill(0x00, 0, zeroes)
+
+ let j = zeroes
+ while (it4 !== size) {
+ vch[j++] = b256[it4++]
+ }
+
+ return vch
+ }
+
+ function decode (string: string): Buffer {
+ const buffer = decodeUnsafe(string)
+ if (buffer) return buffer
+
+ throw new Error('Non-base' + BASE + ' character')
+ }
+
+ return {
+ encode: encode,
+ decodeUnsafe: decodeUnsafe,
+ decode: decode
+ }
+}
+
+export = base;
+
+declare namespace base {
+ interface BaseConverter {
+ encode(buffer: Buffer): string;
+ decodeUnsafe(string: string): Buffer | undefined;
+ decode(string: string): Buffer;
+ }
+}
projects / perso / Immae / Projets / Cryptomonnaies / BIP39.git / commitdiff
