devcap-get-feature

[zorko]

Does anyone how devcap-get-feature works?

I have found it used in the configuration file these ways:


devcap-get-feature -i screen dpi

Returns 212 in my PW


devcap-get-feature -s adtcp available

Returns true

devcap-get-feature -a frontlight

Returns 1

Anything else to try?

[NiLuJe]

That's on my 'TO INVESTIGATE' list. From what I gathered, it seems to be using an encrypted (?!) model-specific database, but I didn't get further than that.

[knc1]

?? http://sqlcipher.net/ ??
Encrypted SQLite3 - - not the only such critter in the world of embedded systems.

Note: There should be one in recent versions of Build Root.

Lots of fun breaking 256 AES - CBC, if that is what you are looking at.
(but the key must be lying around somewhere)

[NiLuJe]

@knc1: Not actually sure it's SQLite at all. Read that as 'binary blob' until further investigations .

[eureka]

On Kindle Touch 5.3.2

devcap-encrypt -i /etc/deviceConfig.conf /tmp/deviceConfig.decrypted.conf

will create INI-like file:

Spoiler:

# Groups are started by a header line containing the group name enclosed in '[' and ']',
# and ended implicitly by the start of the next group or the end of the file. 
# The group common contains features common to all devices, the remaining groups are devices associated with the platform.
# If feature.available=value does not exist its value will be assumed as false by default.
# For example audio.available key not existing means that there is no audio available.
# Please make sure the entries added here are not part of values calculated at runtime. Those value will be overwritten.
# For example varlocal.size will be overwritten by the value obtained from the ioctl call.
[common]
screen.available=true
screen.dpi=167
screen.resolution.width=600
screen.resolution.height=800
framebuffer.stride=608
wifi.available=true
touch.available=true
touch.proc=/proc/touch
button.home.available=true
usb.available=true
audio.available=true
accessory.available=true
adtcp.available=false
menu.wireless.available=true
archivepurchasedate.update=true
verticalswipe.available=true
[whitney]
wan.available=true
[whitney_wfo]

Obviously, it's the source for devcap-get-feature tool:

# devcap-get-feature -a audio
1
# devcap-get-feature -s audio available
true
# devcap-get-feature -i screen dpi
167

[NiLuJe]

@eureka: Awesome, thanks! :}.