NAS

A .NAS file is a compressed paletted image archive format. The format appears to be proprietary and specific to the ''Bunny Pro. Das2'' visual novel software for Windows.

See also DPK.

Specification

 * This format has the signature
 * Payload-size (int)
 * A fixed-size palette of 256 entries totalling 768 bytes. Each entry is a 3-byte tuple for the red, blue and green component. (Most images do not use all 256 entries but the palette is always 768 bytes)
 * A series of chunks, either starting with the bytes  or  . Most images only have a single   chunk.

NB chunk
The NB chunk contains image data and has the following format:


 * Signature
 * Image width (short)
 * Image height (short)
 * Unknown 1 (short) — usually 0 or 1
 * Unknown 2 (short) — always 0
 * Unknown 3 (short) — always 1
 * Length of data (int)
 * Image data

The image data is compressed and the method is unknown.

AD chunk
The format of this chunk is unknown:


 * Signature
 * Data (362 bytes)

Sample files

 * Corsage → ...Disc 1.iso → NAS.DPK (DPK format) → *.NAS