@ton/core/dist/utils/base32.js

Core TypeScript library that implements low level primitives for TON blockchain.

"use strict";
/**
 * Copyright (c) Whales Corp.
 * All Rights Reserved.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.base32Decode = exports.base32Encode = void 0;
const alphabet = 'abcdefghijklmnopqrstuvwxyz234567';
function base32Encode(buffer) {
    const length = buffer.byteLength;
    let bits = 0;
    let value = 0;
    let output = '';
    for (let i = 0; i < length; i++) {
        value = (value << 8) | buffer[i];
        bits += 8;
        while (bits >= 5) {
            output += alphabet[(value >>> (bits - 5)) & 31];
            bits -= 5;
        }
    }
    if (bits > 0) {
        output += alphabet[(value << (5 - bits)) & 31];
    }
    return output;
}
exports.base32Encode = base32Encode;
function readChar(alphabet, char) {
    const idx = alphabet.indexOf(char);
    if (idx === -1) {
        throw new Error('Invalid character found: ' + char);
    }
    return idx;
}
function base32Decode(input) {
    let cleanedInput;
    cleanedInput = input.toLowerCase();
    const { length } = cleanedInput;
    let bits = 0;
    let value = 0;
    let index = 0;
    const output = Buffer.alloc(((length * 5) / 8) | 0);
    for (let i = 0; i < length; i++) {
        value = (value << 5) | readChar(alphabet, cleanedInput[i]);
        bits += 5;
        if (bits >= 8) {
            output[index++] = (value >>> (bits - 8)) & 255;
            bits -= 8;
        }
    }
    return output;
}
exports.base32Decode = base32Decode;