Vromfs
What is Vromfs?
Vromfs is a type of virtual file system used by Dagor games.
Files and directories are compressed into a single file with the extension
.vromfs.bin. This file can be both compressed and cryptographically signed
during creation.
Files are created and managed using vromfsPacker-dev.exe, which can also
unpack them. To use it, run the command:
vromfsPacker-dev.exe some_config.blk
The configuration file in .blk format, contains rules for compression,
specifying what to compress, the source and destination paths of directories,
compression settings, signing, etc.
See also
For more information, see .blk File Format.
You can open a .vromfs.bin file to inspect which directories and files are
compressed within each vrom file and identify their source paths. It is also
possible to decompress a vrom file manually.
Using vromfs protects data from modification and significantly reduces load times.
Important Tips and Hints
Potential Issues: using the flag has drawbacks. For example, the disappearance of a file might go unnoticed because it would still be found in the vromf.
daNetGame Approach: daNetGame-based games use a different concept. All add-ons and vromfs are mounted to the game via a list in
settings.blk, which also provides the source of the vromf. The flagdebug{useAddonVromSrc:b=yes}tells the game to ignore vromfs and instead mount the provided directories.See also
For more information, see settings.blk.
Advantages of Vromfs: vromfs are small and can hold vital information, such as scripts and game data, which allows updates or patches without a full patch (particularly important for consoles or phones where quick updates are not feasible). Consequently, vromfs are updated in all games. In War Thunder, this is done via a special service that also synchronizes vromfs between dedicated servers and clients. In daNetGame-based games, the game downloads these files at startup (only on consoles). Future updates may include downloading vromfs before joining queues or in other scenarios.