@mediapipe/tasks-vision/wasm/vision_wasm_internal.js

MediaPipe Vision Tasks

// This code implements the `-sMODULARIZE` settings by taking the generated
// JS program code (INNER_JS_CODE) and wrapping it in a factory function.

// Single threaded MINIMAL_RUNTIME programs do not need access to
// document.currentScript, so a simple export declaration is enough.
var ModuleFactory = (() => {
  // When MODULARIZE this JS may be executed later,
  // after document.currentScript is gone, so we save it.
  // In EXPORT_ES6 mode we can just use 'import.meta.url'.
  var _scriptName = globalThis.document?.currentScript?.src;
  return async function(moduleArg = {}) {
    var moduleRtn;

// include: shell.js
// include: minimum_runtime_check.js
// end include: minimum_runtime_check.js
// The Module object: Our interface to the outside world. We import
// and export values on it. There are various ways Module can be used:
// 1. Not defined. We create it here
// 2. A function parameter, function(moduleArg) => Promise<Module>
// 3. pre-run appended it, var Module = {}; ..generated code..
// 4. External script tag defines var Module.
// We need to check if Module already exists (e.g. case 3 above).
// Substitution will be replaced with actual code on later stage of the build,
// this way Closure Compiler will not mangle it (e.g. case 4. above).
// Note that if you want to run closure, and also to use Module
// after the generated code, you will need to define   var Module = {};
// before the code. Then that object will be used in the code, and you
// can continue to use Module afterwards as well.
var Module = moduleArg;

// Determine the runtime environment we are in. You can customize this by
// setting the ENVIRONMENT setting at compile time (see settings.js).
// Attempt to auto-detect the environment
var ENVIRONMENT_IS_WEB = !!globalThis.window;

var ENVIRONMENT_IS_WORKER = !!globalThis.WorkerGlobalScope;

// N.b. Electron.js environment is simultaneously a NODE-environment, but
// also a web environment.
var ENVIRONMENT_IS_NODE = globalThis.process?.versions?.node && globalThis.process?.type != "renderer";

// --pre-jses are emitted after the Module integration code, so that they can
// refer to Module (if they choose; they can also define Module)
var arguments_ = [];

var thisProgram = "./this.program";

var quit_ = (status, toThrow) => {
  throw toThrow;
};

if (typeof __filename != "undefined") {
  // Node
  _scriptName = __filename;
} else if (ENVIRONMENT_IS_WORKER) {
  _scriptName = self.location.href;
}

// `/` should be present at the end if `scriptDirectory` is not empty
var scriptDirectory = "";

function locateFile(path) {
  if (Module["locateFile"]) {
    return Module["locateFile"](path, scriptDirectory);
  }
  return scriptDirectory + path;
}

// Hooks that are implemented differently in different runtime environments.
var readAsync, readBinary;

if (ENVIRONMENT_IS_NODE) {
  // These modules will usually be used on Node.js. Load them eagerly to avoid
  // the complexity of lazy-loading.
  var fs = require("node:fs");
  scriptDirectory = __dirname + "/";
  // include: node_shell_read.js
  readBinary = filename => {
    // We need to re-wrap `file://` strings to URLs.
    filename = isFileURI(filename) ? new URL(filename) : filename;
    var ret = fs.readFileSync(filename);
    return ret;
  };
  readAsync = async (filename, binary = true) => {
    // See the comment in the `readBinary` function.
    filename = isFileURI(filename) ? new URL(filename) : filename;
    var ret = fs.readFileSync(filename, binary ? undefined : "utf8");
    return ret;
  };
  // end include: node_shell_read.js
  if (process.argv.length > 1) {
    thisProgram = process.argv[1].replace(/\\/g, "/");
  }
  arguments_ = process.argv.slice(2);
  quit_ = (status, toThrow) => {
    process.exitCode = status;
    throw toThrow;
  };
} else // Note that this includes Node.js workers when relevant (pthreads is enabled).
// Node.js workers are detected as a combination of ENVIRONMENT_IS_WORKER and
// ENVIRONMENT_IS_NODE.
if (ENVIRONMENT_IS_WEB || ENVIRONMENT_IS_WORKER) {
  try {
    scriptDirectory = new URL(".", _scriptName).href;
  } catch {}
  {
    // include: web_or_worker_shell_read.js
    if (ENVIRONMENT_IS_WORKER) {
      readBinary = url => {
        var xhr = new XMLHttpRequest;
        xhr.open("GET", url, false);
        xhr.responseType = "arraybuffer";
        xhr.send(null);
        return new Uint8Array(/** @type{!ArrayBuffer} */ (xhr.response));
      };
    }
    readAsync = async url => {
      // Fetch has some additional restrictions over XHR, like it can't be used on a file:// url.
      // See https://github.com/github/fetch/pull/92#issuecomment-140665932
      // Cordova or Electron apps are typically loaded from a file:// url.
      // So use XHR on webview if URL is a file URL.
      if (isFileURI(url)) {
        return new Promise((resolve, reject) => {
          var xhr = new XMLHttpRequest;
          xhr.open("GET", url, true);
          xhr.responseType = "arraybuffer";
          xhr.onload = () => {
            if (xhr.status == 200 || (xhr.status == 0 && xhr.response)) {
              // file URLs can return 0
              resolve(xhr.response);
              return;
            }
            reject(xhr.status);
          };
          xhr.onerror = reject;
          xhr.send(null);
        });
      }
      var response = await fetch(url, {
        credentials: "same-origin"
      });
      if (response.ok) {
        return response.arrayBuffer();
      }
      throw new Error(response.status + " : " + response.url);
    };
  }
} else {}

var out = console.log.bind(console);

var err = console.error.bind(console);

// end include: shell.js
// include: preamble.js
// === Preamble library stuff ===
// Documentation for the public APIs defined in this file must be updated in:
//    site/source/docs/api_reference/preamble.js.rst
// A prebuilt local version of the documentation is available at:
//    site/build/text/docs/api_reference/preamble.js.txt
// You can also build docs locally as HTML or other formats in site/
// An online HTML version (which may be of a different version of Emscripten)
//    is up at http://kripken.github.io/emscripten-site/docs/api_reference/preamble.js.html
var wasmBinary;

// Wasm globals
//========================================
// Runtime essentials
//========================================
// whether we are quitting the application. no code should run after this.
// set in exit() and abort()
var ABORT = false;

// set by exit() and abort().  Passed to 'onExit' handler.
// NOTE: This is also used as the process return code in shell environments
// but only when noExitRuntime is false.
var EXITSTATUS;

// In STRICT mode, we only define assert() when ASSERTIONS is set.  i.e. we
// don't define it at all in release modes.  This matches the behaviour of
// MINIMAL_RUNTIME.
// TODO(sbc): Make this the default even without STRICT enabled.
/** @type {function(*, string=)} */ function assert(condition, text) {
  if (!condition) {
    // This build was created without ASSERTIONS defined.  `assert()` should not
    // ever be called in this configuration but in case there are callers in
    // the wild leave this simple abort() implementation here for now.
    abort(text);
  }
}

/**
 * Indicates whether filename is delivered via file protocol (as opposed to http/https)
 * @noinline
 */ var isFileURI = filename => filename.startsWith("file://");

// include: runtime_common.js
// include: runtime_stack_check.js
// end include: runtime_stack_check.js
// include: runtime_exceptions.js
// end include: runtime_exceptions.js
// include: runtime_debug.js
// end include: runtime_debug.js
var readyPromiseResolve, readyPromiseReject;

// Memory management
var /** @type {!Int8Array} */ HEAP8, /** @type {!Uint8Array} */ HEAPU8, /** @type {!Int16Array} */ HEAP16, /** @type {!Uint16Array} */ HEAPU16, /** @type {!Int32Array} */ HEAP32, /** @type {!Uint32Array} */ HEAPU32, /** @type {!Float32Array} */ HEAPF32, /** @type {!Float64Array} */ HEAPF64;

var runtimeInitialized = false;

function updateMemoryViews() {
  var b = wasmMemory.buffer;
  HEAP8 = new Int8Array(b);
  HEAP16 = new Int16Array(b);
  Module["HEAPU8"] = HEAPU8 = new Uint8Array(b);
  HEAPU16 = new Uint16Array(b);
  HEAP32 = new Int32Array(b);
  Module["HEAPU32"] = HEAPU32 = new Uint32Array(b);
  Module["HEAPF32"] = HEAPF32 = new Float32Array(b);
  Module["HEAPF64"] = HEAPF64 = new Float64Array(b);
}

// include: memoryprofiler.js
// end include: memoryprofiler.js
// end include: runtime_common.js
function preRun() {
  if (Module["preRun"]) {
    if (typeof Module["preRun"] == "function") Module["preRun"] = [ Module["preRun"] ];
    while (Module["preRun"].length) {
      addOnPreRun(Module["preRun"].shift());
    }
  }
  // Begin ATPRERUNS hooks
  callRuntimeCallbacks(onPreRuns);
}

function initRuntime() {
  runtimeInitialized = true;
  // Begin ATINITS hooks
  if (!Module["noFSInit"] && !FS.initialized) FS.init();
  TTY.init();
  // End ATINITS hooks
  wasmExports["jd"]();
  // Begin ATPOSTCTORS hooks
  FS.ignorePermissions = false;
}

function postRun() {
  // PThreads reuse the runtime from the main thread.
  if (Module["postRun"]) {
    if (typeof Module["postRun"] == "function") Module["postRun"] = [ Module["postRun"] ];
    while (Module["postRun"].length) {
      addOnPostRun(Module["postRun"].shift());
    }
  }
  // Begin ATPOSTRUNS hooks
  callRuntimeCallbacks(onPostRuns);
}

/** @param {string|number=} what */ function abort(what) {
  Module["onAbort"]?.(what);
  what = "Aborted(" + what + ")";
  // TODO(sbc): Should we remove printing and leave it up to whoever
  // catches the exception?
  err(what);
  ABORT = true;
  what += ". Build with -sASSERTIONS for more info.";
  // Use a wasm runtime error, because a JS error might be seen as a foreign
  // exception, which means we'd run destructors on it. We need the error to
  // simply make the program stop.
  // FIXME This approach does not work in Wasm EH because it currently does not assume
  // all RuntimeErrors are from traps; it decides whether a RuntimeError is from
  // a trap or not based on a hidden field within the object. So at the moment
  // we don't have a way of throwing a wasm trap from JS. TODO Make a JS API that
  // allows this in the wasm spec.
  // Suppress closure compiler warning here. Closure compiler's builtin extern
  // definition for WebAssembly.RuntimeError claims it takes no arguments even
  // though it can.
  // TODO(https://github.com/google/closure-compiler/pull/3913): Remove if/when upstream closure gets fixed.
  /** @suppress {checkTypes} */ var e = new WebAssembly.RuntimeError(what);
  readyPromiseReject?.(e);
  // Throw the error whether or not MODULARIZE is set because abort is used
  // in code paths apart from instantiation where an exception is expected
  // to be thrown when abort is called.
  throw e;
}

var wasmBinaryFile;

function findWasmBinary() {
  return locateFile("vision_wasm_internal.wasm");
}

function getBinarySync(file) {
  if (file == wasmBinaryFile && wasmBinary) {
    return new Uint8Array(wasmBinary);
  }
  if (readBinary) {
    return readBinary(file);
  }
  // Throwing a plain string here, even though it not normally advisable since
  // this gets turning into an `abort` in instantiateArrayBuffer.
  throw "both async and sync fetching of the wasm failed";
}

async function getWasmBinary(binaryFile) {
  // If we don't have the binary yet, load it asynchronously using readAsync.
  if (!wasmBinary) {
    // Fetch the binary using readAsync
    try {
      var response = await readAsync(binaryFile);
      return new Uint8Array(response);
    } catch {}
  }
  // Otherwise, getBinarySync should be able to get it synchronously
  return getBinarySync(binaryFile);
}

async function instantiateArrayBuffer(binaryFile, imports) {
  try {
    var binary = await getWasmBinary(binaryFile);
    var instance = await WebAssembly.instantiate(binary, imports);
    return instance;
  } catch (reason) {
    err(`failed to asynchronously prepare wasm: ${reason}`);
    abort(reason);
  }
}

async function instantiateAsync(binary, binaryFile, imports) {
  if (!binary && !isFileURI(binaryFile) && !ENVIRONMENT_IS_NODE) {
    try {
      var response = fetch(binaryFile, {
        credentials: "same-origin"
      });
      var instantiationResult = await WebAssembly.instantiateStreaming(response, imports);
      return instantiationResult;
    } catch (reason) {
      // We expect the most common failure cause to be a bad MIME type for the binary,
      // in which case falling back to ArrayBuffer instantiation should work.
      err(`wasm streaming compile failed: ${reason}`);
      err("falling back to ArrayBuffer instantiation");
    }
  }
  return instantiateArrayBuffer(binaryFile, imports);
}

function getWasmImports() {
  // prepare imports
  var imports = {
    "a": wasmImports
  };
  return imports;
}

// Create the wasm instance.
// Receives the wasm imports, returns the exports.
async function createWasm() {
  // Load the wasm module and create an instance of using native support in the JS engine.
  // handle a generated wasm instance, receiving its exports and
  // performing other necessary setup
  /** @param {WebAssembly.Module=} module*/ function receiveInstance(instance, module) {
    wasmExports = instance.exports;
    assignWasmExports(wasmExports);
    updateMemoryViews();
    return wasmExports;
  }
  // Prefer streaming instantiation if available.
  function receiveInstantiationResult(result) {
    // 'result' is a ResultObject object which has both the module and instance.
    // receiveInstance() will swap in the exports (to Module.asm) so they can be called
    // TODO: Due to Closure regression https://github.com/google/closure-compiler/issues/3193, the above line no longer optimizes out down to the following line.
    // When the regression is fixed, can restore the above PTHREADS-enabled path.
    return receiveInstance(result["instance"]);
  }
  var info = getWasmImports();
  // User shell pages can write their own Module.instantiateWasm = function(imports, successCallback) callback
  // to manually instantiate the Wasm module themselves. This allows pages to
  // run the instantiation parallel to any other async startup actions they are
  // performing.
  // Also pthreads and wasm workers initialize the wasm instance through this
  // path.
  if (Module["instantiateWasm"]) {
    return new Promise((resolve, reject) => {
      Module["instantiateWasm"](info, (inst, mod) => {
        resolve(receiveInstance(inst, mod));
      });
    });
  }
  wasmBinaryFile ??= findWasmBinary();
  var result = await instantiateAsync(wasmBinary, wasmBinaryFile, info);
  var exports = receiveInstantiationResult(result);
  return exports;
}

// Globals used by JS i64 conversions (see makeSetValue)
var tempDouble;

var tempI64;

// end include: preamble.js
// Begin JS library code
var handleException = e => {
  // Certain exception types we do not treat as errors since they are used for
  // internal control flow.
  // 1. ExitStatus, which is thrown by exit()
  // 2. "unwind", which is thrown by emscripten_unwind_to_js_event_loop() and others
  //    that wish to return to JS event loop.
  if (e instanceof ExitStatus || e == "unwind") {
    return EXITSTATUS;
  }
  quit_(1, e);
};

class ExitStatus {
  name="ExitStatus";
  constructor(status) {
    this.message = `Program terminated with exit(${status})`;
    this.status = status;
  }
}

var runtimeKeepaliveCounter = 0;

var keepRuntimeAlive = () => noExitRuntime || runtimeKeepaliveCounter > 0;

var _proc_exit = code => {
  EXITSTATUS = code;
  if (!keepRuntimeAlive()) {
    Module["onExit"]?.(code);
    ABORT = true;
  }
  quit_(code, new ExitStatus(code));
};

/** @param {boolean|number=} implicit */ var exitJS = (status, implicit) => {
  EXITSTATUS = status;
  _proc_exit(status);
};

var _exit = exitJS;

var maybeExit = () => {
  if (!keepRuntimeAlive()) {
    try {
      _exit(EXITSTATUS);
    } catch (e) {
      handleException(e);
    }
  }
};

var callUserCallback = func => {
  if (ABORT) {
    return;
  }
  try {
    return func();
  } catch (e) {
    handleException(e);
  } finally {
    maybeExit();
  }
};

function getFullscreenElement() {
  return document.fullscreenElement || document.mozFullScreenElement || document.webkitFullscreenElement || document.webkitCurrentFullScreenElement || document.msFullscreenElement;
}

/** @param {number=} timeout */ var safeSetTimeout = (func, timeout) => setTimeout(() => {
  callUserCallback(func);
}, timeout);

var warnOnce = text => {
  warnOnce.shown ||= {};
  if (!warnOnce.shown[text]) {
    warnOnce.shown[text] = 1;
    if (ENVIRONMENT_IS_NODE) text = "warning: " + text;
    err(text);
  }
};

var preloadPlugins = [];

var Browser = {
  useWebGL: false,
  isFullscreen: false,
  pointerLock: false,
  moduleContextCreatedCallbacks: [],
  workers: [],
  preloadedImages: {},
  preloadedAudios: {},
  getCanvas: () => Module["canvas"],
  init() {
    if (Browser.initted) return;
    Browser.initted = true;
    // Support for plugins that can process preloaded files. You can add more of these to
    // your app by creating and appending to preloadPlugins.
    // Each plugin is asked if it can handle a file based on the file's name. If it can,
    // it is given the file's raw data. When it is done, it calls a callback with the file's
    // (possibly modified) data. For example, a plugin might decompress a file, or it
    // might create some side data structure for use later (like an Image element, etc.).
    var imagePlugin = {};
    imagePlugin["canHandle"] = name => !Module["noImageDecoding"] && /\.(jpg|jpeg|png|bmp|webp)$/i.test(name);
    imagePlugin["handle"] = async (byteArray, name) => {
      var b = new Blob([ byteArray ], {
        type: Browser.getMimetype(name)
      });
      if (b.size !== byteArray.length) {
        // Safari bug #118630
        // Safari's Blob can only take an ArrayBuffer
        b = new Blob([ (new Uint8Array(byteArray)).buffer ], {
          type: Browser.getMimetype(name)
        });
      }
      var url = URL.createObjectURL(b);
      return new Promise((resolve, reject) => {
        var img = new Image;
        img.onload = () => {
          var canvas = /** @type {!HTMLCanvasElement} */ (document.createElement("canvas"));
          canvas.width = img.width;
          canvas.height = img.height;
          var ctx = canvas.getContext("2d");
          ctx.drawImage(img, 0, 0);
          Browser.preloadedImages[name] = canvas;
          URL.revokeObjectURL(url);
          resolve(byteArray);
        };
        img.onerror = event => {
          err(`Image ${url} could not be decoded`);
          reject();
        };
        img.src = url;
      });
    };
    preloadPlugins.push(imagePlugin);
    var audioPlugin = {};
    audioPlugin["canHandle"] = name => !Module["noAudioDecoding"] && name.slice(-4) in {
      ".ogg": 1,
      ".wav": 1,
      ".mp3": 1
    };
    audioPlugin["handle"] = async (byteArray, name) => new Promise((resolve, reject) => {
      var done = false;
      function finish(audio) {
        if (done) return;
        done = true;
        Browser.preloadedAudios[name] = audio;
        resolve(byteArray);
      }
      var b = new Blob([ byteArray ], {
        type: Browser.getMimetype(name)
      });
      var url = URL.createObjectURL(b);
      // XXX we never revoke this!
      var audio = new Audio;
      audio.addEventListener("canplaythrough", () => finish(audio), false);
      // use addEventListener due to chromium bug 124926
      audio.onerror = event => {
        if (done) return;
        err(`warning: browser could not fully decode audio ${name}, trying slower base64 approach`);
        function encode64(data) {
          var BASE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
          var PAD = "=";
          var ret = "";
          var leftchar = 0;
          var leftbits = 0;
          for (var i = 0; i < data.length; i++) {
            leftchar = (leftchar << 8) | data[i];
            leftbits += 8;
            while (leftbits >= 6) {
              var curr = (leftchar >> (leftbits - 6)) & 63;
              leftbits -= 6;
              ret += BASE[curr];
            }
          }
          if (leftbits == 2) {
            ret += BASE[(leftchar & 3) << 4];
            ret += PAD + PAD;
          } else if (leftbits == 4) {
            ret += BASE[(leftchar & 15) << 2];
            ret += PAD;
          }
          return ret;
        }
        audio.src = "data:audio/x-" + name.slice(-3) + ";base64," + encode64(byteArray);
        finish(audio);
      };
      audio.src = url;
      // workaround for chrome bug 124926 - we do not always get oncanplaythrough or onerror
      safeSetTimeout(() => {
        finish(audio);
      }, 1e4);
    });
    preloadPlugins.push(audioPlugin);
    // Canvas event setup
    function pointerLockChange() {
      var canvas = Browser.getCanvas();
      Browser.pointerLock = document.pointerLockElement === canvas;
    }
    var canvas = Browser.getCanvas();
    if (canvas) {
      // forced aspect ratio can be enabled by defining 'forcedAspectRatio' on Module
      // Module['forcedAspectRatio'] = 4 / 3;
      document.addEventListener("pointerlockchange", pointerLockChange, false);
      if (Module["elementPointerLock"]) {
        canvas.addEventListener("click", ev => {
          if (!Browser.pointerLock && Browser.getCanvas().requestPointerLock) {
            Browser.getCanvas().requestPointerLock();
            ev.preventDefault();
          }
        }, false);
      }
    }
  },
  createContext(/** @type {HTMLCanvasElement} */ canvas, useWebGL, setInModule, webGLContextAttributes) {
    if (useWebGL && Module["ctx"] && canvas == Browser.getCanvas()) return Module["ctx"];
    // no need to recreate GL context if it's already been created for this canvas.
    var ctx;
    var contextHandle;
    if (useWebGL) {
      // For GLES2/desktop GL compatibility, adjust a few defaults to be different to WebGL defaults, so that they align better with the desktop defaults.
      var contextAttributes = {
        antialias: false,
        alpha: false,
        majorVersion: (typeof WebGL2RenderingContext != "undefined") ? 2 : 1
      };
      if (webGLContextAttributes) {
        for (var attribute in webGLContextAttributes) {
          contextAttributes[attribute] = webGLContextAttributes[attribute];
        }
      }
      // This check of existence of GL is here to satisfy Closure compiler, which yells if variable GL is referenced below but GL object is not
      // actually compiled in because application is not doing any GL operations. TODO: Ideally if GL is not being used, this function
      // Browser.createContext() should not even be emitted.
      if (typeof GL != "undefined") {
        contextHandle = GL.createContext(canvas, contextAttributes);
        if (contextHandle) {
          ctx = GL.getContext(contextHandle).GLctx;
        }
      }
    } else {
      ctx = canvas.getContext("2d");
    }
    if (!ctx) return null;
    if (setInModule) {
      Module["ctx"] = ctx;
      if (useWebGL) GL.makeContextCurrent(contextHandle);
      Browser.useWebGL = useWebGL;
      Browser.moduleContextCreatedCallbacks.forEach(callback => callback());
      Browser.init();
    }
    return ctx;
  },
  fullscreenHandlersInstalled: false,
  lockPointer: undefined,
  resizeCanvas: undefined,
  requestFullscreen(lockPointer, resizeCanvas) {
    Browser.lockPointer = lockPointer;
    Browser.resizeCanvas = resizeCanvas;
    if (typeof Browser.lockPointer == "undefined") Browser.lockPointer = true;
    if (typeof Browser.resizeCanvas == "undefined") Browser.resizeCanvas = false;
    var canvas = Browser.getCanvas();
    function fullscreenChange() {
      Browser.isFullscreen = false;
      var canvasContainer = canvas.parentNode;
      if (getFullscreenElement() === canvasContainer) {
        canvas.exitFullscreen = Browser.exitFullscreen;
        if (Browser.lockPointer) canvas.requestPointerLock();
        Browser.isFullscreen = true;
        if (Browser.resizeCanvas) {
          Browser.setFullscreenCanvasSize();
        } else {
          Browser.updateCanvasDimensions(canvas);
        }
      } else {
        // remove the full screen specific parent of the canvas again to restore the HTML structure from before going full screen
        canvasContainer.parentNode.insertBefore(canvas, canvasContainer);
        canvasContainer.parentNode.removeChild(canvasContainer);
        if (Browser.resizeCanvas) {
          Browser.setWindowedCanvasSize();
        } else {
          Browser.updateCanvasDimensions(canvas);
        }
      }
      Module["onFullScreen"]?.(Browser.isFullscreen);
      Module["onFullscreen"]?.(Browser.isFullscreen);
    }
    if (!Browser.fullscreenHandlersInstalled) {
      Browser.fullscreenHandlersInstalled = true;
      document.addEventListener("fullscreenchange", fullscreenChange, false);
      document.addEventListener("mozfullscreenchange", fullscreenChange, false);
      document.addEventListener("webkitfullscreenchange", fullscreenChange, false);
      document.addEventListener("MSFullscreenChange", fullscreenChange, false);
    }
    // create a new parent to ensure the canvas has no siblings. this allows browsers to optimize full screen performance when its parent is the full screen root
    var canvasContainer = document.createElement("div");
    canvas.parentNode.insertBefore(canvasContainer, canvas);
    canvasContainer.appendChild(canvas);
    // use parent of canvas as full screen root to allow aspect ratio correction (Firefox stretches the root to screen size)
    canvasContainer.requestFullscreen = canvasContainer["requestFullscreen"] || canvasContainer["mozRequestFullScreen"] || canvasContainer["msRequestFullscreen"] || (canvasContainer["webkitRequestFullscreen"] ? () => canvasContainer["webkitRequestFullscreen"](Element["ALLOW_KEYBOARD_INPUT"]) : null) || (canvasContainer["webkitRequestFullScreen"] ? () => canvasContainer["webkitRequestFullScreen"](Element["ALLOW_KEYBOARD_INPUT"]) : null);
    canvasContainer.requestFullscreen();
  },
  exitFullscreen() {
    // This is workaround for chrome. Trying to exit from fullscreen
    // not in fullscreen state will cause "TypeError: Document not active"
    // in chrome. See https://github.com/emscripten-core/emscripten/pull/8236
    if (!Browser.isFullscreen) {
      return false;
    }
    var CFS = document["exitFullscreen"] || document["cancelFullScreen"] || document["mozCancelFullScreen"] || document["msExitFullscreen"] || document["webkitCancelFullScreen"] || (() => {});
    CFS.apply(document, []);
    return true;
  },
  safeSetTimeout(func, timeout) {
    // Legacy function, this is used by the SDL2 port so we need to keep it
    // around at least until that is updated.
    // See https://github.com/libsdl-org/SDL/pull/6304
    return safeSetTimeout(func, timeout);
  },
  getMimetype(name) {
    return {
      "jpg": "image/jpeg",
      "jpeg": "image/jpeg",
      "png": "image/png",
      "bmp": "image/bmp",
      "ogg": "audio/ogg",
      "wav": "audio/wav",
      "mp3": "audio/mpeg"
    }[name.slice(name.lastIndexOf(".") + 1)];
  },
  getUserMedia(func) {
    window.getUserMedia ||= navigator["getUserMedia"] || navigator["mozGetUserMedia"];
    window.getUserMedia(func);
  },
  getMovementX(event) {
    return event["movementX"] || event["mozMovementX"] || event["webkitMovementX"] || 0;
  },
  getMovementY(event) {
    return event["movementY"] || event["mozMovementY"] || event["webkitMovementY"] || 0;
  },
  getMouseWheelDelta(event) {
    var delta = 0;
    switch (event.type) {
     case "DOMMouseScroll":
      // 3 lines make up a step
      delta = event.detail / 3;
      break;

     case "mousewheel":
      // 120 units make up a step
      delta = event.wheelDelta / 120;
      break;

     case "wheel":
      delta = event.deltaY;
      switch (event.deltaMode) {
       case 0:
        // DOM_DELTA_PIXEL: 100 pixels make up a step
        delta /= 100;
        break;

       case 1:
        // DOM_DELTA_LINE: 3 lines make up a step
        delta /= 3;
        break;

       case 2:
        // DOM_DELTA_PAGE: A page makes up 80 steps
        delta *= 80;
        break;

       default:
        abort("unrecognized mouse wheel delta mode: " + event.deltaMode);
      }
      break;

     default:
      abort("unrecognized mouse wheel event: " + event.type);
    }
    return delta;
  },
  mouseX: 0,
  mouseY: 0,
  mouseMovementX: 0,
  mouseMovementY: 0,
  touches: {},
  lastTouches: {},
  calculateMouseCoords(pageX, pageY) {
    // Calculate the movement based on the changes
    // in the coordinates.
    var canvas = Browser.getCanvas();
    var rect = canvas.getBoundingClientRect();
    // Neither .scrollX or .pageXOffset are defined in a spec, but
    // we prefer .scrollX because it is currently in a spec draft.
    // (see: http://www.w3.org/TR/2013/WD-cssom-view-20131217/)
    var scrollX = ((typeof window.scrollX != "undefined") ? window.scrollX : window.pageXOffset);
    var scrollY = ((typeof window.scrollY != "undefined") ? window.scrollY : window.pageYOffset);
    var adjustedX = pageX - (scrollX + rect.left);
    var adjustedY = pageY - (scrollY + rect.top);
    // the canvas might be CSS-scaled compared to its backbuffer;
    // SDL-using content will want mouse coordinates in terms
    // of backbuffer units.
    adjustedX = adjustedX * (canvas.width / rect.width);
    adjustedY = adjustedY * (canvas.height / rect.height);
    return {
      x: adjustedX,
      y: adjustedY
    };
  },
  setMouseCoords(pageX, pageY) {
    const {x, y} = Browser.calculateMouseCoords(pageX, pageY);
    Browser.mouseMovementX = x - Browser.mouseX;
    Browser.mouseMovementY = y - Browser.mouseY;
    Browser.mouseX = x;
    Browser.mouseY = y;
  },
  calculateMouseEvent(event) {
    // event should be mousemove, mousedown or mouseup
    if (Browser.pointerLock) {
      // When the pointer is locked, calculate the coordinates
      // based on the movement of the mouse.
      // Workaround for Firefox bug 764498
      if (event.type != "mousemove" && ("mozMovementX" in event)) {
        Browser.mouseMovementX = Browser.mouseMovementY = 0;
      } else {
        Browser.mouseMovementX = Browser.getMovementX(event);
        Browser.mouseMovementY = Browser.getMovementY(event);
      }
      // add the mouse delta to the current absolute mouse position
      Browser.mouseX += Browser.mouseMovementX;
      Browser.mouseY += Browser.mouseMovementY;
    } else {
      if (event.type === "touchstart" || event.type === "touchend" || event.type === "touchmove") {
        var touch = event.touch;
        if (touch === undefined) {
          return;
        }
        var coords = Browser.calculateMouseCoords(touch.pageX, touch.pageY);
        if (event.type === "touchstart") {
          Browser.lastTouches[touch.identifier] = coords;
          Browser.touches[touch.identifier] = coords;
        } else if (event.type === "touchend" || event.type === "touchmove") {
          var last = Browser.touches[touch.identifier];
          last ||= coords;
          Browser.lastTouches[touch.identifier] = last;
          Browser.touches[touch.identifier] = coords;
        }
        return;
      }
      Browser.setMouseCoords(event.pageX, event.pageY);
    }
  },
  resizeListeners: [],
  updateResizeListeners() {
    var canvas = Browser.getCanvas();
    Browser.resizeListeners.forEach(listener => listener(canvas.width, canvas.height));
  },
  setCanvasSize(width, height, noUpdates) {
    var canvas = Browser.getCanvas();
    Browser.updateCanvasDimensions(canvas, width, height);
    if (!noUpdates) Browser.updateResizeListeners();
  },
  windowedWidth: 0,
  windowedHeight: 0,
  setFullscreenCanvasSize() {
    // check if SDL is available
    if (typeof SDL != "undefined") {
      var flags = HEAPU32[((SDL.screen) >> 2)];
      flags = flags | 8388608;
      // set SDL_FULLSCREEN flag
      HEAP32[((SDL.screen) >> 2)] = flags;
    }
    Browser.updateCanvasDimensions(Browser.getCanvas());
    Browser.updateResizeListeners();
  },
  setWindowedCanvasSize() {
    // check if SDL is available
    if (typeof SDL != "undefined") {
      var flags = HEAPU32[((SDL.screen) >> 2)];
      flags = flags & ~8388608;
      // clear SDL_FULLSCREEN flag
      HEAP32[((SDL.screen) >> 2)] = flags;
    }
    Browser.updateCanvasDimensions(Browser.getCanvas());
    Browser.updateResizeListeners();
  },
  updateCanvasDimensions(canvas, wNative, hNative) {
    if (wNative && hNative) {
      canvas.widthNative = wNative;
      canvas.heightNative = hNative;
    } else {
      wNative = canvas.widthNative;
      hNative = canvas.heightNative;
    }
    var w = wNative;
    var h = hNative;
    if (Module["forcedAspectRatio"] > 0) {
      if (w / h < Module["forcedAspectRatio"]) {
        w = Math.round(h * Module["forcedAspectRatio"]);
      } else {
        h = Math.round(w / Module["forcedAspectRatio"]);
      }
    }
    if ((getFullscreenElement() === canvas.parentNode) && (typeof screen != "undefined")) {
      var factor = Math.min(screen.width / w, screen.height / h);
      w = Math.round(w * factor);
      h = Math.round(h * factor);
    }
    if (Browser.resizeCanvas) {
      if (canvas.width != w) canvas.width = w;
      if (canvas.height != h) canvas.height = h;
      if (typeof canvas.style != "undefined") {
        canvas.style.removeProperty("width");
        canvas.style.removeProperty("height");
      }
    } else {
      if (canvas.width != wNative) canvas.width = wNative;
      if (canvas.height != hNative) canvas.height = hNative;
      if (typeof canvas.style != "undefined") {
        if (w != wNative || h != hNative) {
          canvas.style.setProperty("width", w + "px", "important");
          canvas.style.setProperty("height", h + "px", "important");
        } else {
          canvas.style.removeProperty("width");
          canvas.style.removeProperty("height");
        }
      }
    }
  }
};

var callRuntimeCallbacks = callbacks => {
  while (callbacks.length > 0) {
    // Pass the module as the first argument.
    callbacks.shift()(Module);
  }
};

var onPostRuns = [];

var addOnPostRun = cb => onPostRuns.push(cb);

var onPreRuns = [];

var addOnPreRun = cb => onPreRuns.push(cb);

var noExitRuntime = true;

var stackRestore = val => __emscripten_stack_restore(val);

var stackSave = () => _emscripten_stack_get_current();

class ExceptionInfo {
  // excPtr - Thrown object pointer to wrap. Metadata pointer is calculated from it.
  constructor(excPtr) {
    this.excPtr = excPtr;
    this.ptr = excPtr - 24;
  }
  set_type(type) {
    HEAPU32[(((this.ptr) + (4)) >> 2)] = type;
  }
  get_type() {
    return HEAPU32[(((this.ptr) + (4)) >> 2)];
  }
  set_destructor(destructor) {
    HEAPU32[(((this.ptr) + (8)) >> 2)] = destructor;
  }
  get_destructor() {
    return HEAPU32[(((this.ptr) + (8)) >> 2)];
  }
  set_caught(caught) {
    caught = caught ? 1 : 0;
    HEAP8[(this.ptr) + (12)] = caught;
  }
  get_caught() {
    return HEAP8[(this.ptr) + (12)] != 0;
  }
  set_rethrown(rethrown) {
    rethrown = rethrown ? 1 : 0;
    HEAP8[(this.ptr) + (13)] = rethrown;
  }
  get_rethrown() {
    return HEAP8[(this.ptr) + (13)] != 0;
  }
  // Initialize native structure fields. Should be called once after allocated.
  init(type, destructor) {
    this.set_adjusted_ptr(0);
    this.set_type(type);
    this.set_destructor(destructor);
  }
  set_adjusted_ptr(adjustedPtr) {
    HEAPU32[(((this.ptr) + (16)) >> 2)] = adjustedPtr;
  }
  get_adjusted_ptr() {
    return HEAPU32[(((this.ptr) + (16)) >> 2)];
  }
}

var exceptionLast = 0;

var uncaughtExceptionCount = 0;

var ___cxa_throw = (ptr, type, destructor) => {
  var info = new ExceptionInfo(ptr);
  // Initialize ExceptionInfo content after it was allocated in __cxa_allocate_exception.
  info.init(type, destructor);
  exceptionLast = ptr;
  uncaughtExceptionCount++;
  throw exceptionLast;
};

var PATH = {
  isAbs: path => path.charAt(0) === "/",
  splitPath: filename => {
    var splitPathRe = /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;
    return splitPathRe.exec(filename).slice(1);
  },
  normalizeArray: (parts, allowAboveRoot) => {
    // if the path tries to go above the root, `up` ends up > 0
    var up = 0;
    for (var i = parts.length - 1; i >= 0; i--) {
      var last = parts[i];
      if (last === ".") {
        parts.splice(i, 1);
      } else if (last === "..") {
        parts.splice(i, 1);
        up++;
      } else if (up) {
        parts.splice(i, 1);
        up--;
      }
    }
    // if the path is allowed to go above the root, restore leading ..s
    if (allowAboveRoot) {
      for (;up; up--) {
        parts.unshift("..");
      }
    }
    return parts;
  },
  normalize: path => {
    var isAbsolute = PATH.isAbs(path), trailingSlash = path.slice(-1) === "/";
    // Normalize the path
    path = PATH.normalizeArray(path.split("/").filter(p => !!p), !isAbsolute).join("/");
    if (!path && !isAbsolute) {
      path = ".";
    }
    if (path && trailingSlash) {
      path += "/";
    }
    return (isAbsolute ? "/" : "") + path;
  },
  dirname: path => {
    var result = PATH.splitPath(path), root = result[0], dir = result[1];
    if (!root && !dir) {
      // No dirname whatsoever
      return ".";
    }
    if (dir) {
      // It has a dirname, strip trailing slash
      dir = dir.slice(0, -1);
    }
    return root + dir;
  },
  basename: path => path && path.match(/([^\/]+|\/)\/*$/)[1],
  join: (...paths) => PATH.normalize(paths.join("/")),
  join2: (l, r) => PATH.normalize(l + "/" + r)
};

var initRandomFill = () => {
  // This block is not needed on v19+ since crypto.getRandomValues is builtin
  if (ENVIRONMENT_IS_NODE) {
    var nodeCrypto = require("node:crypto");
    return view => nodeCrypto.randomFillSync(view);
  }
  return view => crypto.getRandomValues(view);
};

var randomFill = view => {
  // Lazily init on the first invocation.
  (randomFill = initRandomFill())(view);
};

var PATH_FS = {
  resolve: (...args) => {
    var resolvedPath = "", resolvedAbsolute = false;
    for (var i = args.length - 1; i >= -1 && !resolvedAbsolute; i--) {
      var path = (i >= 0) ? args[i] : FS.cwd();
      // Skip empty and invalid entries
      if (typeof path != "string") {
        throw new TypeError("Arguments to path.resolve must be strings");
      } else if (!path) {
        return "";
      }
      resolvedPath = path + "/" + resolvedPath;
      resolvedAbsolute = PATH.isAbs(path);
    }
    // At this point the path should be resolved to a full absolute path, but
    // handle relative paths to be safe (might happen when process.cwd() fails)
    resolvedPath = PATH.normalizeArray(resolvedPath.split("/").filter(p => !!p), !resolvedAbsolute).join("/");
    return ((resolvedAbsolute ? "/" : "") + resolvedPath) || ".";
  },
  relative: (from, to) => {
    from = PATH_FS.resolve(from).slice(1);
    to = PATH_FS.resolve(to).slice(1);
    function trim(arr) {
      var start = 0;
      for (;start < arr.length; start++) {
        if (arr[start] !== "") break;
      }
      var end = arr.length - 1;
      for (;end >= 0; end--) {
        if (arr[end] !== "") break;
      }
      if (start > end) return [];
      return arr.slice(start, end - start + 1);
    }
    var fromParts = trim(from.split("/"));
    var toParts = trim(to.split("/"));
    var length = Math.min(fromParts.length, toParts.length);
    var samePartsLength = length;
    for (var i = 0; i < length; i++) {
      if (fromParts[i] !== toParts[i]) {
        samePartsLength = i;
        break;
      }
    }
    var outputParts = [];
    for (var i = samePartsLength; i < fromParts.length; i++) {
      outputParts.push("..");
    }
    outputParts = outputParts.concat(toParts.slice(samePartsLength));
    return outputParts.join("/");
  }
};

var UTF8Decoder = new TextDecoder;

var findStringEnd = (heapOrArray, idx, maxBytesToRead, ignoreNul) => {
  var maxIdx = idx + maxBytesToRead;
  if (ignoreNul) return maxIdx;
  // TextDecoder needs to know the byte length in advance, it doesn't stop on
  // null terminator by itself.
  // As a tiny code save trick, compare idx against maxIdx using a negation,
  // so that maxBytesToRead=undefined/NaN means Infinity.
  while (heapOrArray[idx] && !(idx >= maxIdx)) ++idx;
  return idx;
};

/**
   * Given a pointer 'idx' to a null-terminated UTF8-encoded string in the given
   * array that contains uint8 values, returns a copy of that string as a
   * Javascript String object.
   * heapOrArray is either a regular array, or a JavaScript typed array view.
   * @param {number=} idx
   * @param {number=} maxBytesToRead
   * @param {boolean=} ignoreNul - If true, the function will not stop on a NUL character.
   * @return {string}
   */ var UTF8ArrayToString = (heapOrArray, idx = 0, maxBytesToRead, ignoreNul) => {
  var endPtr = findStringEnd(heapOrArray, idx, maxBytesToRead, ignoreNul);
  return UTF8Decoder.decode(heapOrArray.buffer ? heapOrArray.subarray(idx, endPtr) : new Uint8Array(heapOrArray.slice(idx, endPtr)));
};

var FS_stdin_getChar_buffer = [];

var lengthBytesUTF8 = str => {
  var len = 0;
  for (var i = 0; i < str.length; ++i) {
    // Gotcha: charCodeAt returns a 16-bit word that is a UTF-16 encoded code
    // unit, not a Unicode code point of the character! So decode
    // UTF16->UTF32->UTF8.
    // See http://unicode.org/faq/utf_bom.html#utf16-3
    var c = str.charCodeAt(i);
    // possibly a lead surrogate
    if (c <= 127) {
      len++;
    } else if (c <= 2047) {
      len += 2;
    } else if (c >= 55296 && c <= 57343) {
      len += 4;
      ++i;
    } else {
      len += 3;
    }
  }
  return len;
};

var stringToUTF8Array = (str, heap, outIdx, maxBytesToWrite) => {
  // Parameter maxBytesToWrite is not optional. Negative values, 0, null,
  // undefined and false each don't write out any bytes.
  if (!(maxBytesToWrite > 0)) return 0;
  var startIdx = outIdx;
  var endIdx = outIdx + maxBytesToWrite - 1;
  // -1 for string null terminator.
  for (var i = 0; i < str.length; ++i) {
    // For UTF8 byte structure, see http://en.wikipedia.org/wiki/UTF-8#Description
    // and https://www.ietf.org/rfc/rfc2279.txt
    // and https://tools.ietf.org/html/rfc3629
    var u = str.codePointAt(i);
    if (u <= 127) {
      if (outIdx >= endIdx) break;
      heap[outIdx++] = u;
    } else if (u <= 2047) {
      if (outIdx + 1 >= endIdx) break;
      heap[outIdx++] = 192 | (u >> 6);
      heap[outIdx++] = 128 | (u & 63);
    } else if (u <= 65535) {
      if (outIdx + 2 >= endIdx) break;
      heap[outIdx++] = 224 | (u >> 12);
      heap[outIdx++] = 128 | ((u >> 6) & 63);
      heap[outIdx++] = 128 | (u & 63);
    } else {
      if (outIdx + 3 >= endIdx) break;
      heap[outIdx++] = 240 | (u >> 18);
      heap[outIdx++] = 128 | ((u >> 12) & 63);
      heap[outIdx++] = 128 | ((u >> 6) & 63);
      heap[outIdx++] = 128 | (u & 63);
      // Gotcha: if codePoint is over 0xFFFF, it is represented as a surrogate pair in UTF-16.
      // We need to manually skip over the second code unit for correct iteration.
      i++;
    }
  }
  // Null-terminate the pointer to the buffer.
  heap[outIdx] = 0;
  return outIdx - startIdx;
};

/** @type {function(string, boolean=, number=)} */ var intArrayFromString = (stringy, dontAddNull, length) => {
  var len = length > 0 ? length : lengthBytesUTF8(stringy) + 1;
  var u8array = new Array(len);
  var numBytesWritten = stringToUTF8Array(stringy, u8array, 0, u8array.length);
  if (dontAddNull) u8array.length = numBytesWritten;
  return u8array;
};

var FS_stdin_getChar = () => {
  if (!FS_stdin_getChar_buffer.length) {
    var result = null;
    if (ENVIRONMENT_IS_NODE) {
      // we will read data by chunks of BUFSIZE
      var BUFSIZE = 256;
      var buf = Buffer.alloc(BUFSIZE);
      var bytesRead = 0;
      // For some reason we must suppress a closure warning here, even though
      // fd definitely exists on process.stdin, and is even the proper way to
      // get the fd of stdin,
      // https://github.com/nodejs/help/issues/2136#issuecomment-523649904
      // This started to happen after moving this logic out of library_tty.js,
      // so it is related to the surrounding code in some unclear manner.
      /** @suppress {missingProperties} */ var fd = process.stdin.fd;
      try {
        bytesRead = fs.readSync(fd, buf, 0, BUFSIZE);
      } catch (e) {
        // Cross-platform differences: on Windows, reading EOF throws an
        // exception, but on other OSes, reading EOF returns 0. Uniformize
        // behavior by treating the EOF exception to return 0.
        if (e.toString().includes("EOF")) bytesRead = 0; else throw e;
      }
      if (bytesRead > 0) {
        result = buf.slice(0, bytesRead).toString("utf-8");
      }
    } else if (globalThis.window?.prompt) {
      // Browser.
      result = window.prompt("Input: ");
      // returns null on cancel
      if (result !== null) {
        result += "\n";
      }
    } else {}
    if (!result) {
      return null;
    }
    FS_stdin_getChar_buffer = intArrayFromString(result, true);
  }
  return FS_stdin_getChar_buffer.shift();
};

var TTY = {
  ttys: [],
  init() {},
  shutdown() {},
  register(dev, ops) {
    TTY.ttys[dev] = {
      input: [],
      output: [],
      ops
    };
    FS.registerDevice(dev, TTY.stream_ops);
  },
  stream_ops: {
    open(stream) {
      var tty = TTY.ttys[stream.node.rdev];
      if (!tty) {
        throw new FS.ErrnoError(43);
      }
      stream.tty = tty;
      stream.seekable = false;
    },
    close(stream) {
      // flush any pending line data
      stream.tty.ops.fsync(stream.tty);
    },
    fsync(stream) {
      stream.tty.ops.fsync(stream.tty);
    },
    read(stream, buffer, offset, length, pos) {
      if (!stream.tty || !stream.tty.ops.get_char) {
        throw new FS.ErrnoError(60);
      }
      var bytesRead = 0;
      for (var i = 0; i < length; i++) {
        var result;
        try {
          result = stream.tty.ops.get_char(stream.tty);
        } catch (e) {
          throw new FS.ErrnoError(29);
        }
        if (result === undefined && bytesRead === 0) {
          throw new FS.ErrnoError(6);
        }
        if (result === null || result === undefined) break;
        bytesRead++;
        buffer[offset + i] = result;
      }
      if (bytesRead) {
        stream.node.atime = Date.now();
      }
      return bytesRead;
    },
    write(stream, buffer, offset, length, pos) {
      if (!stream.tty || !stream.tty.ops.put_char) {
        throw new FS.ErrnoError(60);
      }
      try {
        for (var i = 0; i < length; i++) {
          stream.tty.ops.put_char(stream.tty, buffer[offset + i]);
        }
      } catch (e) {
        throw new FS.ErrnoError(29);
      }
      if (length) {
        stream.node.mtime = stream.node.ctime = Date.now();
      }
      return i;
    }
  },
  default_tty_ops: {
    get_char(tty) {
      return FS_stdin_getChar();
    },
    put_char(tty, val) {
      if (val === null || val === 10) {
        out(UTF8ArrayToString(tty.output));
        tty.output = [];
      } else {
        if (val != 0) tty.output.push(val);
      }
    },
    fsync(tty) {
      if (tty.output?.length > 0) {
        out(UTF8ArrayToString(tty.output));
        tty.output = [];
      }
    },
    ioctl_tcgets(tty) {
      // typical setting
      return {
        c_iflag: 25856,
        c_oflag: 5,
        c_cflag: 191,
        c_lflag: 35387,
        c_cc: [ 3, 28, 127, 21, 4, 0, 1, 0, 17, 19, 26, 0, 18, 15, 23, 22, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
      };
    },
    ioctl_tcsets(tty, optional_actions, data) {
      // currently just ignore
      return 0;
    },
    ioctl_tiocgwinsz(tty) {
      return [ 24, 80 ];
    }
  },
  default_tty1_ops: {
    put_char(tty, val) {
      if (val === null || val === 10) {
        err(UTF8ArrayToString(tty.output));
        tty.output = [];
      } else {
        if (val != 0) tty.output.push(val);
      }
    },
    fsync(tty) {
      if (tty.output?.length > 0) {
        err(UTF8ArrayToString(tty.output));
        tty.output = [];
      }
    }
  }
};

var zeroMemory = (ptr, size) => HEAPU8.fill(0, ptr, ptr + size);

var alignMemory = (size, alignment) => Math.ceil(size / alignment) * alignment;

var mmapAlloc = size => {
  size = alignMemory(size, 65536);
  var ptr = _emscripten_builtin_memalign(65536, size);
  if (ptr) zeroMemory(ptr, size);
  return ptr;
};

var MEMFS = {
  ops_table: null,
  mount(mount) {
    return MEMFS.createNode(null, "/", 16895, 0);
  },
  createNode(parent, name, mode, dev) {
    if (FS.isBlkdev(mode) || FS.isFIFO(mode)) {
      // not supported
      throw new FS.ErrnoError(63);
    }
    MEMFS.ops_table ||= {
      dir: {
        node: {
          getattr: MEMFS.node_ops.getattr,
          setattr: MEMFS.node_ops.setattr,
          lookup: MEMFS.node_ops.lookup,
          mknod: MEMFS.node_ops.mknod,
          rename: MEMFS.node_ops.rename,
          unlink: MEMFS.node_ops.unlink,
          rmdir: MEMFS.node_ops.rmdir,
          readdir: MEMFS.node_ops.readdir,
          symlink: MEMFS.node_ops.symlink
        },
        stream: {
          llseek: MEMFS.stream_ops.llseek
        }
      },
      file: {
        node: {
          getattr: MEMFS.node_ops.getattr,
          setattr: MEMFS.node_ops.setattr
        },
        stream: {
          llseek: MEMFS.stream_ops.llseek,
          read: MEMFS.stream_ops.read,
          write: MEMFS.stream_ops.write,
          mmap: MEMFS.stream_ops.mmap,
          msync: MEMFS.stream_ops.msync
        }
      },
      link: {
        node: {
          getattr: MEMFS.node_ops.getattr,
          setattr: MEMFS.node_