[Linuxsampler-devel] Kontakt NKI file format

[Christian Schoenebeck]

Hi!

Does anybody know something about the NKI file format? Apprently a NKI file
encapsulates a compressed XML file. The question is, how is it compressed?

Benno said it would be an ordinary ZIP file with some bytes prepended. I looked
now at some Kontakt 2 ... 4 files and cannot confirm that. I neither see
something that looks similar to a zip header (no matter which offset) and I
dont find a DEFLATE compression stream either (which is pretty much the
standard compression method for zip).

Any hints?

CU
Christian

[Grigor Iliev]

Here is how I successfully uncompressed nki file using zlib:
I look for the first occurrence of "78 9C" bytes and skip the bytes
before those magic bytes
dd if=a.nki of=a.z bs=10 skip=17

Then, I use http://www.zlib.net/zpipe.c
gcc zpipe.c -o zpipe -lz
./zpipe -d < a.z > a.xml


On Wed, Jul 28, 2010 at 11:33 AM, Christian Schoenebeck

Post by Christian Schoenebeck
Hi!
Does anybody know something about the NKI file format? Apprently a NKI file
encapsulates a compressed XML file. The question is, how is it compressed?
Benno said it would be an ordinary ZIP file with some bytes prepended. I looked
now at some Kontakt 2 ... 4 files and cannot confirm that. I neither see
something that looks similar to a zip header (no matter which offset) and I
dont find a DEFLATE compression stream either (which is pretty much the
standard compression method for zip).
Any hints?
CU
Christian
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[Christian Schoenebeck]

Post by Grigor Iliev
I look for the first occurrence of "78 9C" bytes and skip the bytes
before those magic bytes
dd if=a.nki of=a.z bs=10 skip=17
Then, I use http://www.zlib.net/zpipe.c
gcc zpipe.c -o zpipe -lz
./zpipe -d < a.z > a.xml

Oops, you're right. I actually did the same, but using cut instead of dd. I
guess there was some newline character issue. Anyway, it works that way for
Kontakt v2, v3 and even v4 files.

Thanks Grigor!

CU
Christian