Oldswf Blob Downloader

Download cached oldswf game blobs from the current game page.

Download cached oldswf game blobs from the current game page. I hate the fact that oldswf goes to such lengths to prevent you from downloading their old swf, so I made this. # OldSWF Blob Downloader OldSWF Blob Downloader is a Chrome extension that lets you download the original SWF file from games hosted on oldswf.com. The extension works on: `https://oldswf.com/game/*` Features * Captures standard SWF files created with `URL.createObjectURL()` * Detects valid SWF headers (`FWS`, `CWS`, or `ZWS`) * Downloads the largest captured SWF with a single click * Ignores site-specific cached blobs that are not valid SWF files If no valid SWF is detected, the download button will prompt you to refresh the page and wait for the game to reload. Usage 1. Install OldSWF Blob Downloader from the Chrome Web Store. 2. Open any game on oldswf.com. 3. Refresh the page so the extension can begin monitoring before the game's scripts execute. 4. Wait for the game to finish loading. 5. Click the Download Captured SWF button in the bottom-right corner of the page. How It Works The extension runs at `document_start` and overrides the page's native `URL.createObjectURL()` function. Whenever the page creates a Blob URL, the extension reads the first eight bytes of the Blob. If it begins with a valid SWF signature (`FWS`, `CWS`, or `ZWS`), the Blob is saved as a download candidate. When you click the download button, the extension downloads the largest valid SWF Blob captured during the page load. Notes OldSWF also stores resources in IndexedDB: * Database:`swf_db` * Object Store:`cacheFiles` These cached blobs may use a site-specific wrapper format instead of containing a standard SWF, so the extension intentionally ignores them. For example, on the game "A Wish of the Temple (神庙的祈愿)", the IndexedDB cache may contain a key such as: `/data/game/32805.swf` The actual playable SWF is the standard Blob generated by the page at runtime. The IndexedDB cache may contain a wrapped version, and requesting the server path directly may only return a 404 HTML page instead of the SWF.