dungeoncraft/www/dc_plugin.js

// DungeonCraft browser plugin for miniquad: localStorage access for the Rust code.
(function () {
    "use strict";
    var pending = null;

    function bytes(ptr, len) {
        return new Uint8Array(wasm_memory.buffer, ptr, len);
    }
    function str(ptr, len) {
        return new TextDecoder().decode(bytes(ptr, len));
    }

    function register(importObject) {
        importObject.env.dc_storage_get = function (kp, kl) {
            var v = null;
            try { v = window.localStorage.getItem(str(kp, kl)); } catch (e) { }
            if (v === null) { pending = null; return -1; }
            pending = new TextEncoder().encode(v);
            return pending.length;
        };
        importObject.env.dc_storage_take = function (ptr) {
            if (pending === null) return;
            bytes(ptr, pending.length).set(pending);
            pending = null;
        };
        importObject.env.dc_storage_set = function (kp, kl, vp, vl) {
            try { window.localStorage.setItem(str(kp, kl), str(vp, vl)); } catch (e) { }
        };
    }

    miniquad_add_plugin({ register_plugin: register, version: 1, name: "dungeoncraft" });
})();