[File] magic file for CIS/COD images ("Lightning Strike")

[Robert Jäschke]

Dear all,

are obsolete bitmap graphics formats still relevant for file? I've been
researching the "CIS/COD" ("Lightning Strike") image file format¹ for a
while now² and have created the magic description below.³ I would be
pleased to see it included in file but you've got to decide how relevant
this is.


Best regards,
Robert


¹ http://justsolve.archiveteam.org/wiki/Lightning_Strike
² https://cod.igada.de/
³ also available here: https://cod.igada.de/resources.html



# Type: CIS/COD Bitmaps
# Documentation: https://cod.igada.de/ and http://justsolve.archiveteam.org/wiki/Lightning_Strike
# From: Robert Jäschke <robert.jaeschke at hu-berlin.de>
0       string    CIS       CIS/COD image data,
!:mime  image/cis-cod
!:ext   png
# versions 2.3 to 2.5 are different to version 3.0
>3      regex/4   2\.[345]  version %s,
>>16    leshort   x         %d x
>>18    leshort   x         %d
# so far we know more about version 3.0
>3      string/3  3.0       version %s,
# width and height
>>16    leshort   x         %d x
>>18    leshort   x         %d x
>>20    byte      x         %d
# gray vs. color
>>21    byte      0         (gray,
>>21    byte      1         (color,
# encoder type
>>24    byte      1         lossy arithmetic encoder,
>>24    byte      2         lossless arithmetic encoder,
# compression type
>>25    byte      1         bi-wavelet compression,
# quantizer type
>>26    byte      1         table quantization,
# scb
>>27    byte      1         SISD,
# color space
>>28    byte      1         YIQ RGB,
>>28    byte      2         YUV RGB,
>>28    byte      3         YCbCr RGB,
# wavelet levels
>>29    byte      x         %d wavelet levels)

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