New backend: IsoFS.

README.md

@@ -21,6 +21,8 @@ BrowserFS is highly extensible, and ships with many filesystem backends:
 * `ZipFS`: Read-only zip file-backed FS. Lazily decompresses files as you access them.
   * Supports DEFLATE out-of-the-box.
   * Have super old zip files? [The `browserfs-zipfs-extras` package](https://github.com/jvilk/browserfs-zipfs-extras) adds support for EXPLODE, UNREDUCE, and UNSHRINK.
+* `IsoFS`: Mount an .iso file into the file system.
+  * Supports Microsoft Joliet and Rock Ridge extensions to the ISO9660 standard.
 * `WorkerFS`: Lets you mount the BrowserFS file system configured in the main thread in a WebWorker, or the other way around!
 * `MountableFileSystem`: Lets you mount multiple file systems into a single directory hierarchy, as in *nix-based OSes.
 * `OverlayFS`: Mount a read-only file system as read-write by overlaying a writable file system on top of it. Like Docker's overlayfs, it will only write changed files to the writable file system.

scripts/make_iso_fixtures.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+# Creates ISO files for testing the ISOFS.
+# Not auto-generated during the testing process to avoid a hard
+# dependency on ISO-building tools.
+
+# package.json is included in both so the proper directory structure
+# is generated.
+
+# NOTE: -graft-points doesn't work on newer versions of Mac OSX.
+# So we have a gigantic exclusion list.
+
+# Usage: make_iso flags filename
+make_iso () {
+  mkisofs $1 -o $2 -m 'node_modules' -m '.git' -m '.tscache' -m '.vscode' -m 'build' -m 'dist' -m 'scripts' -m 'src' -m 'tests' -m 'harness' -m '*.pem' -m '*.json' -m '*.zip' -m '*.iso' .
+}
+
+# -J: Joliet
+# -D: Ignore 7 directory limit.
+make_iso -JD test/fixtures/isofs/test_joliet.iso
+
+
+# -hide-rr-moved:
+# -R: Enable Rock Ridge
+make_iso "-R -hide-rr-moved" test/fixtures/isofs/test_rock_ridge.iso