parse raw image to read block group desc table!

[Lakshmipathi.G]

As Andreas mentioned, using libext2fs (http://giis.co.in/libext2fs.pdf) is
100 times easier than writing your own code
and I learned this hard way :p First two links are insane, I highly
recommend not to open them ;)  third link uses libext2fs.

https://github.com/Lakshmipathi/giis/blob/master/src/init.c#L195
http://giis.co.in/Kick_start.html

https://github.com/Lakshmipathi/giis-ext4/blob/master/src/giis-ext4.c



----
Cheers,
Lakshmipathi.G
FOSS Programmer.
www.giis.co.in
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