91 lines
3.0 KiB
TypeScript
91 lines
3.0 KiB
TypeScript
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// Copyright (c) 2017, 2021 Pieter Wuille
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// 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 in
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// 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 THE
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// 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 FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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import bech32 from "./bech32.js"
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export default {
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encode: encode,
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decode: decode
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};
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function convertbits(data: any, frombits: number, tobits: number, pad: boolean): any[] {
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var acc = 0;
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var bits = 0;
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var ret = [];
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var maxv = (1 << tobits) - 1;
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for (var p = 0; p < data.length; ++p) {
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var value = data[p];
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if (value < 0 || (value >> frombits) !== 0) {
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return []; //check this, was returning null
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}
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acc = (acc << frombits) | value;
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bits += frombits;
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while (bits >= tobits) {
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bits -= tobits;
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ret.push((acc >> bits) & maxv);
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}
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}
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if (pad) {
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if (bits > 0) {
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ret.push((acc << (tobits - bits)) & maxv);
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}
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} else if (bits >= frombits || ((acc << (tobits - bits)) & maxv)) {
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return []; //check this, was returning null
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}
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return ret;
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}
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function decode(hrp: any, addr: string) {
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var bech32m = false;
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var dec = bech32.decode(addr, bech32.encodings.BECH32);
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if (dec === null) {
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dec = bech32.decode(addr, bech32.encodings.BECH32M);
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bech32m = true;
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}
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if (dec === null || dec.hrp !== hrp || dec.data.length < 1 || dec.data[0] > 16) {
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return null;
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}
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var res = convertbits(dec.data.slice(1), 5, 8, false);
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if (res === null || res.length < 2 || res.length > 40) {
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return null;
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}
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if (dec.data[0] === 0 && res.length !== 20 && res.length !== 32) {
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return null;
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}
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if (dec.data[0] === 0 && bech32m) {
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return null;
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}
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if (dec.data[0] !== 0 && !bech32m) {
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return null;
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}
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return { version: dec.data[0], program: res };
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}
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function encode(hrp: any, version: number, program: any): string {
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var enc = bech32.encodings.BECH32;
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if (version > 0) {
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enc = bech32.encodings.BECH32M;
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}
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var ret = bech32.encode(hrp, [version].concat(convertbits(program, 8, 5, true)), enc);
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if (decode(hrp, ret/*, enc*/) === null) {
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return ""; //check this was returning null
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}
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return ret;
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}
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