NAS
From Just Solve the File Format Problem
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=== NB chunk === | === NB chunk === | ||
| − | The | + | The '''NB''' chunk contains image data and has the following format: |
* Signature (<code>ND</code>) | * Signature (<code>ND</code>) | ||
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=== AD chunk === | === AD chunk === | ||
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The format of this chunk is unknown: | The format of this chunk is unknown: | ||
* Signature (<code>AD</code>) | * Signature (<code>AD</code>) | ||
* Data (362 bytes) | * Data (362 bytes) | ||
Revision as of 22:25, 26 November 2022
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
ADorNB. Most images only have a singleNBchunk.
NB chunk
The NB chunk contains image data and has the following format:
- Signature (
ND) - 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)
