Class EmscriptenFileSystem

src/backend/Emscripten.ts:194–390

 * Mounts an Emscripten file system into the BrowserFS file system.
 */
export default class EmscriptenFileSystem extends SynchronousFileSystem {
  public static readonly Name = "EmscriptenFileSystem";

  public static readonly Options: FileSystemOptions = {
    FS: {
      type: "object",
      description: "The Emscripten file system to use (the `FS` variable)"
    }
  };

  /**
   * Create an EmscriptenFileSystem instance with the given options.
   */
  public static Create(opts: EmscriptenFileSystemOptions, cb: BFSCallback<EmscriptenFileSystem>): void {
    cb(null, new EmscriptenFileSystem(opts.FS));
  }
  public static isAvailable(): boolean { return true; }

  private _FS: any;

  /**
   * Creates a BrowserFS file system for the given Emscripten file system.
   * @param _FS The Emscripten file system (`FS`).
   */
  constructor(_FS: any) {
    super();
    this._FS = _FS;
  }
  public getName(): string { return this._FS.DB_NAME(); }
  public isReadOnly(): boolean { return false; }
  public supportsLinks(): boolean { return true; }
  public supportsProps(): boolean { return true; }
  public supportsSynch(): boolean { return true; }

  public renameSync(oldPath: string, newPath: string): void {
    try {
      this._FS.rename(oldPath, newPath);
    } catch (e) {
      if (e.errno === ErrorCode.ENOENT) {
        throw convertError(e, this.existsSync(oldPath) ? newPath : oldPath);
      } else {
        throw convertError(e);
      }
    }
  }

  public statSync(p: string, isLstat: boolean): Stats {
    try {
      const stats = isLstat ? this._FS.lstat(p) : this._FS.stat(p);
      const itemType = this.modeToFileType(stats.mode);
      return new Stats(
        itemType,
        stats.size,
        stats.mode,
        stats.atime,
        stats.mtime,
        stats.ctime
      );