Some additional data points for detection of JBIG1/JBIG2 in libmagic: The ITU specifications for both formats are now freely downloadable.
JBIG2 has a header containing an 8-byte signature: 97 4A 42 32 0D 0A 1A 0A http://fileformats.archiveteam.org/wiki/JBIG2 There is a sample JBIG2 file in the jbig2dec source package: jbig2dec-0.13/annex-h.jbig2 For JBIG1, you could import the detection code from jbigkit, which seems to reject files based on heuristics of the header parameters. -- bye, pabs https://wiki.debian.org/PaulWise
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