base256-archive/dist/unpacker.js

Simple archive format that produces a base256-encoded string.

/* IMPORT */
import Base256 from 'base256-encoding';
import { IDENTITY, TYPE_ARRAY, TYPE_OBJECT } from './constants.js';
/* HELPERS */
const Helpers = {
    /* API */
    getDivider: (packed) => {
        if (packed === TYPE_ARRAY || packed === TYPE_OBJECT)
            return;
        const match = /\n-+\n/.exec(packed);
        const divider = match?.[0];
        if (!divider)
            throw new Error('Malformed archive, divider not found');
        return divider;
    },
    getObject: (packed, divider, decode = true) => {
        const decoder = decode ? (value) => Base256.decodeStr(value) : IDENTITY;
        const sections = divider ? packed.split(divider) : [packed];
        const type = sections[0];
        const values = sections.slice(1);
        if (type === TYPE_ARRAY) {
            return values.map(decoder);
        }
        else {
            const object = {};
            for (let i = 0, l = values.length; i < l; i += 2) {
                const key = Base256.decodeStr(values[i]);
                const value = decoder(values[i + 1]);
                object[key] = value;
            }
            return object;
        }
    }
};
/* MAIN */
const Unpacker = {
    /* API */
    unpack: (packed, options) => {
        const divider = Helpers.getDivider(packed);
        const object = Helpers.getObject(packed, divider, options?.decode);
        return object;
    }
};
/* EXPORT */
export default Unpacker;