ZPAQ: many configuration options missing from Squash plugin

[pothos]

Not only "1" and "5" are valid parameters, but also e.g. "x6.0ci1.1.1.1.2aw2mm16tst" for text (see libzpaq.h), so only an integer from 1 to 5 is not enough.
Lateron even c.startBlock(const char* config, …) could also be used instead of compress() to allow usage of own algorithms through their ZPAQL config file .

[nemequ]

You're right, we don't expose a lot of ZPAQ's flexibility, and we should. I don't know when I'll get to this, so in case you would like to take a stab at it:

The relevant code is at plugins/zpaq/squash-zpaq.cpp:49 and :151 (C++ makes this harder, sorry. With C you wouldn't need the second bit). Basically, there should be one option for each thing you're trying to set; LZHAM has lots of options so it should be a good example, and the options API is in squash-options.h. If you need any help, just ask here or drop by #squash on FreeNode.

If you decide to wait, I should warn you that it might be a while. There is a lot of stuff I want to do in Squash first, and ZPAQ isn't very interesting to me since it's not safe for decompression (an attacker can create an archive which causes an infinite loop).