D-LAN

h1. Structures

h2. Files cache

This file contains all the shared files and theirs SHA-1 hashes. This file is saved in user space after an update of the file list, it is completely loaded at the start of Aybabtu. If some paths of some files doesn't match the shared directory they are discarded.

You can see the proto file here : source:/protos/files_cache.proto

h3. Size

Here is a size approximation for 50'000 files stored in 1 TB. The overhead of the file format is not taken in account.

<pre>

Nb of files : 50'0000

Total size : 1 TB

Chunk Size : 32 MB

Average file per directory : 50

Average filename and dirname length : 50 char

Size of a hash : 20B

</pre>

<pre>

AverageFileSize = 1*1024^4 / 50'000 = 21MB

Sha1Size = floor(AverageFileSize / 32MB) * 20 * 50'000 = 1 * 20 * 50'000 = 977kB

FilenameSize = 50'000 * 50 * 2 = 4.8MB (2 bytes per char)

DirnameSize = (50'000 / 50) * 50 * 2 = 97kB

TotalSize = 977kB + 4.8MB + 97kB = 5.9MB

</pre>

h2. Queued files and directories

TODO..

h2. Configuration file

TODO..