@geckos.io/typed-array-buffer-schema/lib/lib.js

A Schema based Object to Buffer converter

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Lib = void 0;
const deep_sort_object_1 = require("./deep-sort-object");
const schema_1 = require("./schema");
class Lib {
    static newHash(name, _struct) {
        // https://stackoverflow.com/a/7616484/12656855
        const strToHash = (s) => {
            let hash = 0;
            for (let i = 0; i < s.length; i++) {
                const chr = s.charCodeAt(i);
                hash = (hash << 5) - hash + chr;
                hash |= 0; // Convert to 32bit integer
            }
            hash *= 254785; // times a random number
            return Math.abs(hash).toString(32).slice(2, 6);
        };
        let hash = strToHash(JSON.stringify(_struct) + name);
        if (hash.length !== 4)
            throw new Error('Hash has not length of 4');
        return `#${hash}`;
    }
    static schema(name, _struct) {
        _struct = (0, deep_sort_object_1.deepSortObject)(_struct);
        const id = Lib.newHash(name, _struct);
        const s = new schema_1.Schema(id, name, _struct);
        this._schemas.set(id, s);
        return s;
    }
}
exports.Lib = Lib;
Lib._schemas = new Map();
Lib.getIdFromBuffer = (buffer) => {
    const dataView = new DataView(buffer);
    let id = '';
    for (let i = 0; i < 5; i++) {
        const uInt8 = dataView.getUint8(i);
        id += String.fromCharCode(uInt8);
    }
    return id;
};
Lib.getIdFromSchema = (schema) => schema.id;
Lib.getIdFromModel = (model) => model.schema.id;
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