NAS

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The '''NB''' chunk contains image data and has the following format:
 
The '''NB''' chunk contains image data and has the following format:
  
* Signature (<code>ND</code>)
+
* Signature (<code>NB</code>)
 
* Image width (''short'')
 
* Image width (''short'')
 
* Image height (''short'')
 
* Image height (''short'')

Revision as of 22:26, 26 November 2022

File Format
Name NAS
Ontology
Extension(s) .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.

Specification

  • This format has the signature 4E 41 00 00
  • 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 AD or NB. Most images only have a single NB chunk.

NB chunk

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

  • Signature (NB)
  • 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 (AD)
  • Data (362 bytes)
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