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CDC File Transfer

https://github.com/google/cdc-file-transfer
23•GalaxySnail•1h ago

Comments

rekttrader•37m ago
Nice to see Stadia had some long term benefit. It’s a shame they don’t make a self hosted version but if you did that it’s just piracy in today’s drm world.
jMyles•28m ago
> it’s just piracy in today’s drm world

...which is more important / needed than ever. I encourage every who asks to get my music from bit torrent instead of spotify.

MyOutfitIsVague•10m ago
Why not something like Bandcamp, or other DRM-free purchase options?

I'm not above piracy if there's no DRM free option (or if the music is very old or the artist is long dead), but I still believe in supporting artists who actively support freedom.

oofbey•20m ago
What do you mean piracy in the a DRM world. Like being able to share your own PC games through the cloud?
kanemcgrath•18m ago
for self-hosted game streaming you can use moonlight + sunshine, they work really well in my experience.
theamk•32m ago
This CDC is "Content Defined Chunking" - fast incremental file transfer.

Use case is to copy file over slow net, but the previous version is already there, so one can save time by only sending changed parts of the file.

Not to be confused with USB CDC ("communications device class"), an USB device protocol used to present serial ports and network cards. It can also be used to transfer files, the old PC-to-PC cables used it by implementing two network cards connected to each other.

oofbey•14m ago
The clever trick is how it recognizes insertions. The standard trick of computing hashes on fixed sized blocks works efficiently for substitutions but is totally defeated by an insertion or deletion.

Instead with CDC the block boundaries are define by the content, so an insertion doesn’t change the block boundary, so it can tell the subsequent blocks are unchanged. I haven’t read the CDC paper but I’m guessing they just use some probabilistic hash function to define certain strings as block boundaries.

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