[kmike84]

Yes, that was the idea.

The whole process is divided into 3 stages: reading, decoding and providing "user-facing API":

- on "reading" stage PSD file is read and split into binary blobs (I think this part is done);

- on "decoding" stage "decoding modules" are called for each binary blob; decoding modules should produce Python data structures that closely resembles internal PSD format;

- on "user API" stage decoded data is converted to more convenient format that is easier to work with (e.g. this include building layers hierarchy, and the PSDImage/Layer/etc classes).

I hope that providing new decoders will be rather straightforward, and it seems to work this way so far: contributors haven't touched "reader" part, and I haven't touched it for a while as well. But software development is hard, so we can never be sure :)