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72 lines
2.1 KiB
TypeScript
72 lines
2.1 KiB
TypeScript
// Loaded from https://raw.githubusercontent.com/nats-io/nkeys.js/v1.0.0-7/src/base32.ts
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/*
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* Copyright 2018-2020 The NATS Authors
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Fork of https://github.com/LinusU/base32-encode
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// and https://github.com/LinusU/base32-decode to support returning
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// buffers without padding.
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/**
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* @ignore
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*/
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export class base32 {
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static alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
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static encode(src: Uint8Array): Uint8Array {
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let bits = 0;
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let value = 0;
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let a = new Uint8Array(src);
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let buf = new Uint8Array(src.byteLength * 2);
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let j = 0;
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for (let i = 0; i < a.byteLength; i++) {
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value = (value << 8) | a[i];
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bits += 8;
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while (bits >= 5) {
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let index = (value >>> (bits - 5)) & 31;
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buf[j++] = base32.alphabet.charAt(index).charCodeAt(0);
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bits -= 5;
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}
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}
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if (bits > 0) {
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let index = (value << (5 - bits)) & 31;
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buf[j++] = base32.alphabet.charAt(index).charCodeAt(0);
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}
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return buf.slice(0, j);
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}
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static decode(src: Uint8Array): Uint8Array {
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let bits = 0;
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let byte = 0;
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let j = 0;
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let a = new Uint8Array(src);
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let out = new Uint8Array(a.byteLength * 5 / 8 | 0);
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for (let i = 0; i < a.byteLength; i++) {
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let v = String.fromCharCode(a[i]);
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let vv = base32.alphabet.indexOf(v);
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if (vv === -1) {
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throw new Error("Illegal Base32 character: " + a[i]);
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}
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byte = (byte << 5) | vv;
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bits += 5;
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if (bits >= 8) {
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out[j++] = (byte >>> (bits - 8)) & 255;
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bits -= 8;
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}
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}
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return out.slice(0, j);
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}
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}
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