@kitmi/utils/cjs/n2b64.js

A JavaScript utility library for both server and browser

// this is not standard base64 encoding, it's a custom encoding that uses a url-friendly alphabet
// for standard base64 encoding, use base64Encode and base64Decode 
"use strict";
Object.defineProperty(exports, "__esModule", {
    value: true
});
function _export(target, all) {
    for(var name in all)Object.defineProperty(target, name, {
        enumerable: true,
        get: all[name]
    });
}
_export(exports, {
    b64ton: function() {
        return b64ton;
    },
    ntob64: function() {
        return ntob64;
    }
});
const alphabet = '-0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz';
// binary to string lookup table
const b2s = alphabet.split('');
// string to binary lookup table
// 123 == 'z'.charCodeAt(0) + 1
const s2b = new Array(123);
for(let i = 0; i < alphabet.length; i++){
    s2b[alphabet.charCodeAt(i)] = i;
}
const ntob64 = (number)=>{
    if (number < 0) return `-${ntob64(-number)}`;
    let lo = number >>> 0;
    let hi = number / 4294967296 >>> 0;
    let right = '';
    while(hi > 0){
        right = b2s[0x3f & lo] + right;
        lo >>>= 6;
        lo |= (0x3f & hi) << 26;
        hi >>>= 6;
    }
    let left = '';
    do {
        left = b2s[0x3f & lo] + left;
        lo >>>= 6;
    }while (lo > 0)
    return left + right;
};
const b64ton = (base64)=>{
    let number = 0;
    const sign = base64.charAt(0) === '-' ? 1 : 0;
    for(let i = sign; i < base64.length; i++){
        number = number * 64 + s2b[base64.charCodeAt(i)];
    }
    return sign ? -number : number;
};

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