Details
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Sub-task
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Status: Open
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Minor
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Resolution: Unresolved
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Description
The GRAPPA Database RADX File format occurs 8,343 times in the second most recent Common Crawl dataset. No known mime type.
It's probably best to leave implementation of this for a day with nothing else to do. It's a very complex signature. Actually there are two versions of the signature due to vagaries of the PRONOM signature language.
Both are at offset 0:
80{14}(40|3F){7}(C0|40){2}(00|FF){1}(00|FF){1}(FF|00){8-9}(00|80){53-54}(40|3F)
and
00{14}(40|3F){7}(C0|40){2}(00|FF){1}(00|FF){1}(FF|00){8-9}(00|80){53-54}(40|3F)
Which can be simplified (if that's possible) to:
(80|14){14}(40|3F){7}(C0|40){2}(00|FF){1}(00|FF){1}(FF|00){8-9}(00|80){53-54}(40|3F)
The {8-9} notation indicates the subsequent values of either 00 or 80 can occur after either 8 or 9 bytes. See sample files.
See https://ftp.imcce.fr/pub/catalogs/GRAPPA/lisez%20moi.txt (in French) for more information.