small EDID library (possible start)

[Kai-Uwe Behrmann]

I found several issues with existing EDID parsing code for usage as 
library in Oyranos (a colour management system).
To move on with a EDID parsing API, I attach a Oyranos header file 
for the EDID parsing.
The EDID API is selfcontained and a bit tweaked toward Xorg integration.
But beside that code may look like Xorg to me, core developers might find 
several issues. I would like to adress issues as long I get aware of them.


Why a new attempt? There preexists several code since long time to parse 
EDIDs data blocks.

That is Adam Jackson's parse-edid.c with lots of global variables and no 
library interface at all (2009). That is fine for the intented usage as 
command line tool, but unfortunedly not a comfortable base for a library.

Soren Sandmann is mentioned as the author of edid-parse.c (2007). I took 
some pices from that. I like the returned structure at a first glace very 
much. Unfortunedly the returned structure is quite static. So I was 
unshure whether this will be extensible as library. I think this code is 
used internally of Xorg for EDID parsing. The API appears to be visible 
only to the server and is not exported. Please correct me if I am wrong.


The attached oyranos_edid_parse code is my try on a API. It provides a 
very simple interface. EDID is passed as a void* pointer. Results are 
returned in a flat structure array. The results are a kind of key value 
pairs. The core API consists of only three functions. The returned values 
are referenced by a key name.
Additionally a XEdid_s structure is declared only for further parsing 
convinience. The parsed items are merely colorimetric and identification 
parts. Missed is the timing and the resolution stuff, which can be added 
later.

Comments are welcome.


kind regards
Kai-Uwe Behrmann
-- 
developing for colour management 
www.behrmann.name + www.oyranos.org
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