When a ZIP contains both a DOS version (FALLOUT.EXE) and a Windows
version (FALLOUTW.EXE), the sort now prefers DOS executables.
This reads the EXE header during candidate collection and ranks:
non-installer → DOS platform → depth → size
Fixes Fallout being mis-detected as a Windows game.
The sort was: depth → non-installer → size.
This meant a root-level SETUP.EXE (depth 1, installer) beat a
subdirectory FALLOUT.EXE (depth 2, non-installer).
New sort: non-installer → depth → size.
Now any non-installer game EXE wins over installers regardless of depth.
DOS4GW.EXE is a 32-bit DOS extender that ships with many DOS games
(DOOM, Fallout, Duke Nukem 3D, etc.). The findMainExe algorithm was
picking it as the main executable because it's typically large and at
the ZIP root, causing the autoexec to run 'DOS4GW' with no arguments
→ 'DOS/4GW fatal error (1004): syntax is DOS/4GW <executable.xxx>'
Added SKIP_EXE_NAMES set with known DOS extenders, DPMI hosts,
debuggers, memory managers, and uninstallers.
- Removed toolbar (Library title, search, upload button) from library
- Moved search box into the sidebar alongside Year/Genre filters
- Removed 'Filters' heading from sidebar
- Replaced 'Library' nav button in header with '+ Upload' button
- Genre filters now sorted by count (desc) instead of alphabetically
- Cleaned up unused CSS
- GameCard: removed 'Ready' badge from covers (keep '🪟 Win' for
Windows games only — it's informative since they can't be played)
- Library: sidebar with Year + Genre checkbox filter groups
- Each shows up to 5 items with game counts, 'Show all' button
- Active filters shown as removable chips above the grid
- Reset button clears all filters
- Filters reflected in URL hash (#/?genre=FPS&year=1996)
- GameDetail: year and genre tags are now clickable links to
#/?year=1996 or #/?genre=FPS, which opens the Library with that
filter pre-applied
- App.svelte: parses query params from hash and passes to Library
Two features:
1. Progress indicator: when upload starts, the dialog switches from
IGDB results to a centered spinner with 'Uploading and processing'
text + filename. The Cancel button stays visible but disabled.
2. Duplicate game blocking: before upload, checks if a game with the
same title (case-insensitive) already exists in the library.
Frontend checks against the loaded games list; backend also
checks as a second line of defense. Shows ⚠️ message in dialog.
Existing unique-ID suffix logic (foo-2, foo-3) is still in place
but now only reached when titles actually differ.
- Wrap flattenSingleDir in try-catch — if it fails, the upload continues
and the cd <subdir> fix in dosbox.conf handles subdirectory executables
- Add global catch to upload method returning the actual exception
message instead of a generic 500
- This will help diagnose why the user's King's Quest VI zip fails:
flattening can throw on special filenames, Mac resource forks,
symlinks, or other unusual ZIP contents
Two issues fixed:
1. Frontend closure bug: IGDB result buttons used Svelte {#each} closure
with onclick={() => doUpload(result.name)}. When clicking the 3rd
result, the 1st result's handler sometimes fired. Fixed by reading
data-name from e.currentTarget.dataset instead of JS closure.
2. Backend scrape mismatch: when user selected 'Blood' from IGDB
results, backend's autoScrape searched for 'Blood' and could match
'Captain Blood' first (alphabetical), overwriting metadata.
Now passes igdb_id along with title so backend uses the EXACT
IGDB entry the user selected via applyIgdbId() instead of
auto-searching.
For pure DOS executables, the e_lfanew field at MZ header offset 0x3C
is uninitialized garbage. Duke Nukem 2's EXE had bytes that form a
negative int32 (-1878619136), which was used as an array index causing
ArrayIndexOutOfBoundsException.
Now checks peOffset < 0 and returns 'dos' (no Windows signature found).
Many classic DOS games (Blood, DOOM, Duke Nukem 3D, Quake) use
DOS/4GW or DOS/32A — 32-bit DOS extenders with Linear Executable
(LE) format. My code was detecting LE as 'windows', causing these
games to be incorrectly flagged as unplayable.
Only PE (Portable Executable / Win32) and NE (New Executable /
Windows 3.x) are actually Windows.
Previously when no IGDB matches were found, the button next to the
search box changed from 'Search' to 'Upload' after the first search.
Since the text is editable and users may want to refine their query,
this button should always trigger a search.
Upload is still available via:
- The 'Upload anyway as "..."' button (shown after failed search)
- The 'Use filename: ...' button at the bottom
- Move platform detection before setup bundle creation
- Only create setup bundle when platform != 'windows'
- Also hide the Setup button in GameDetail for Windows games
- Windows setup executables (INSTALL.EXE) can't run in DOSBox anyway
js-dos v8's C extraction code (jsdos-libzip.c) iterates ZIP entries
linearly and calls mkdir() on each directory entry. If a child
directory appears before its parent, mkdir() fails with perror()
and exit(1) — fatal crash with 'No such file or directory'.
Previous approach wrote directory entries interleaved with files,
deepest-first (from the file path right-to-left). Now:
Phase 1: Walk entire file tree to discover ALL directories
Phase 2: Write ALL dir entries sorted (shallowest first via TreeSet
natural ordering — '/' sorts before any letter)
Phase 3: Write .jsdos/ config files
Phase 4: Write game files (parents already exist from Phase 2)
This guarantees that mkdir("NAS50TH/TRACKS/") runs before
mkdir("NAS50TH/TRACKS/WILKES/"), which runs before open().
Many DOS game ZIPs include CloneCD backups (.ccd/.img/.sub) or
other disk images that are not needed for gameplay — the game data
is already extracted in the working directory. These can be 300MB+
and cause WASM memory exhaustion in js-dos.
Added a SKIP_EXT set that filters out known disk image extensions
during game file pass. The .jsdos config pass is unaffected.
js-dos reads ZIP entries sequentially and needs .jsdos/dosbox.conf and
.jsdos/jsdos.json first to configure DOSBox. Java's Files.walk() uses
filesystem readdir order which put them at the very end of the ZIP
(after the 328MB CloneCD image), causing extraction failures.
Now:
1. First pass: walk .jsdos/ directory and write config files first
2. Second pass: walk everything else (excluding .jsdos/) in sorted order
3. All directory ancestors are still added as explicit entries
4. .sorted() ensures deterministic, alphabetical entry order
Previously only the immediate parent directory was added as a ZIP
entry. For deeply nested paths like NAS50TH/TRACKS/WILKES/WILKES.DAT,
only NAS50TH/TRACKS/WILKES/ was created — but NAS50TH/TRACKS/ and
NAS50TH/ were skipped (they're only parents of other directories,
never the immediate parent of a file).
Emscripten's FS.createDirectory() fails if parent doesn't exist,
so intermediate directories must be in the ZIP too.
Now walks up the full ancestor chain with a while loop.
js-dos uses Emscripten's virtual filesystem which requires explicit
ZIP directory entries (names ending with '/') to create directories.
Java's ZipOutputStream only writes file entries, so subdirectories
like NAS50TH/TRACKS/WILKES/ were never created — causing Emscripten
'No such file or directory' errors for any path inside them.
- createBundle: before writing each file entry, add its parent
directory as an explicit ZIP entry if not already added
- Affects all games with subdirectory structures (NASCAR Racing 2,
Gus Goes to Cyberopolis, etc.)
- Use a HashSet to track already-added directories (no duplicates)
- Game.java: add 'platform' field ('dos'/'windows') + 'isPlayable' helper
- UploadResource.java: detect EXE type by reading PE/NE header during upload
- GameResource.java: allow PATCH to update platform
- GameCard.svelte: show 🪟 Win badge for Windows games (blue style)
- GameDetail.svelte: show platform badge, disable Play for Windows with
'Unplayable' button; add platform dropdown to edit form
- Play.svelte: show blocking overlay for Windows games with 'Try anyway'
option for users who want to attempt it
- Fix flattenSingleDir: flatten when exactly 1 root directory exists,
even if other metadata files (file_id.diz, *.nfo) are present at root
- Fix buildDosboxConf/buildJsdosJson: add 'cd <dir>' before executable
when it lives in a subdirectory, since DOS treats '/' as switch char
(previously 'mastori2/ORION2.EXE' was parsed as command 'mastori2'
with switch '/ORION2.EXE')
- Remove SockdriveResource.java entirely
- Remove bundleType field from Game.java (was 'standard'/'sockdrive')
- Simplify GameResource.java download endpoint
- Clean up upload resource
Hermes Agent