2 #------------------------------------------------------------------------------
3 # $File: dif,v 1.1 2020/04/09 19:14:01 christos Exp $
4 # dif: file(1) magic for DIF text files
6 #------------------------------------------------------------------------------
8 # URL: http://en.wikipedia.org/wiki/Data_Interchange_Format
9 # http://fileformats.archiveteam.org/wiki/Data_Interchange_Format
10 # Note: called by TrID "Data Interchange Format",
11 # by DROID x-fmt/368 "VisiCalc Database"
13 # skip text starting with TABLE by looking for numeric version on 2nd line
15 # skip DROID x-fmt-41-signature-id-380.dif by looking for key word TUPLES at the beginning
16 >>27 search/128 TUPLES Data Interchange Format
17 # https://www.pcmatic.com/company/libraries/fileextension/detail.asp?ext=dif.html
18 #!:mime application/x-dif-spreadsheet Gnumeric
19 # https://github.com/LibreOffice/online/blob/master/discovery.xml
20 #!:mime application/x-dif-document LibreOffice
21 # https://www.wikidata.org/wiki/Wikidata:WikiProject_Informatics/File_formats/Lists/File_formats
22 !:mime application/x-dif
23 # https://extension.nirsoft.net/dif
24 #!:mime application/vnd.ms-excel
27 # look for double quote 0x22 on 3rd line
29 # skip if next character also double quote
30 >>>>&0 ubyte !0x22 \b, generator or table name
31 # comment like EXCEL, pwm enclosed in double quotes