virtual file system in pascal/delphi

[noeska]

Thanks to a question of Brainer on the pgd forum ( http://www.pascalgamedevelopment.com...er=asc&start=0 ) i started writing a virtual file system in pascal. Things now become useable.

Now it is alpha 7 time already. Now it is also possible to delete files. Deleted blocks are reused again.
This only works for tvirtualfilestream bases access to the tvirtualfilesystem. So writedata (and readdata) need to be rewritten to use a tvirtualfilestream. Besides making reusing deleted blocks work with those it save some double code.
With reusing deleted block the tvirtualfilesystem may end up to be defragmented. Hmm how to write such an thing?

Who are willing to give this alpha version a test run? It comes with an basic example i use for testing.
I still have to give the virtualfilesystem a proper name and i am out of ideas so suggestions are welcome.

Download: http://www.noeska.net/downloads/Virt...stemAlpha7.zip

[Brainer]

Nice you're progressing with your code, I'm too busy right now to do anything, that's why I didn't respond earlier. As soon as I get some time (as soon as some motivation as well) I'll post my code, too.

Anyway, congrats noeaska for your constant development, thanks for that.

[noeska]

A short tutorial:

Opening a virtual file system.

  TestDataFile := TVirtualFileSystem.Create();
  TestDataFile.FileName := 'myfilesystem.dat';
  TestDataFile.Open;

Writing a tmemo (mTest) inside the virtual file system:

  MyStream:= TvfsFileStream.Create('test.txt', TestDataFile);
  mTest.Lines.SaveToStream(MyStream);
  MyStream.Free;

Reading a tmemo (mTest) from inside the virtual file system:

  MyStream:= TvfsFileStream.Create('test.txt', TestDataFile);
  mTest.Lines.LoadFromStream(MyStream);
  MyStream.Free;

Also you can download alpha8 here: http://www.noeska.net/downloads/Virt...stemAlpha8.zip
ReadData and WriteData now use TVirtualFileStream and are only 4 lines long now :-)

[chronozphere]

wow... awesome stuff. Looks really easy to use.

Are you going to implement directories?

Keep up the good work!

[noeska]

for now there is only one main directory. But you can cheat by using / in the filename. Just make sure it fits within 255 chars total length. I am not sure if giving each directory its own file within the vfs is an advantage or just complicates things.

Also i discovered an bug that does not allow a file withing the vfs to become smaller. So i need to add code for that first.

[Brainer]

For those who thought my project is dead - it's back on tracks. I have nothing to show yet, but there is going to be a directories support and many more like compression and encryption per file (means you don't have to encrypt/compress all files, you can choose which files you want to affect).

Stay tuned.

[noeska]

2008-12-21: Alpha9 is released. When a (virtual)file becomes smaller additional blocks are marked as deleted. Should work, but needs additional testing. If this goes ok it is almost time for an real beta version.

Download: http://www.noeska.net/downloads/Virt...stemAlpha9.zip

My plan on encryption is make it pluggeable. I do not want to implement encryption support in the virtualfilesystem code. So the vfs class gets a method called SetEncryptionMethod(AEncryptMethod: Object);
For now i am puzzled on should i make AEncryptMethod an Object Pointer or TEncryptProcedure?

[JSoftware]

I would make the argument a class type, so the VFS can instantiate the encrypter class at will

[noeska]

The vfs has a name. Not the most original, but it has a name now and it is: nvfs . Or in full: Noeska's Virtual File System .
The project site is being setup now. (ps it almost took me more time to setup wordpress mu then to write nvfs )

Project Site: http://www.noeska.net/projects/nvfs/
Download version 1.0b: http://www.noeska.net/projects/files/2008/12/nvfs.zip

The basics are working now so i took it out of alpha and into beta.

I need beta testers now. So test it if you dare...

[chronozphere]

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I always get to see this, no matter on which link i click.