2 #------------------------------------------------------------------------------
3 # $File: msooxml,v 1.13 2019/11/27 13:12:55 christos Exp $
4 # msooxml: file(1) magic for Microsoft Office XML
5 # From: Ralf Brown <ralf.brown@gmail.com>
7 # .docx, .pptx, and .xlsx are XML plus other files inside a ZIP
8 # archive. The first member file is normally "[Content_Types].xml".
9 # but some libreoffice generated files put this later. Perhaps skip
10 # the "[Content_Types].xml" test?
11 # Since MSOOXML doesn't have anything like the uncompressed "mimetype"
12 # file of ePub or OpenDocument, we'll have to scan for a filename
13 # which can distinguish between the three types
16 >0 string word/ Microsoft Word 2007+
17 !:mime application/vnd.openxmlformats-officedocument.wordprocessingml.document
18 >0 string ppt/ Microsoft PowerPoint 2007+
19 !:mime application/vnd.openxmlformats-officedocument.presentationml.presentation
20 >0 string xl/ Microsoft Excel 2007+
21 !:mime application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
22 0 string visio/ Microsoft Visio 2013+
23 !:mime application/vnd.ms-visio.drawing.main+xml
25 # start by checking for ZIP local file header signature
28 # make sure the first file is correct
30 >0x1E regex \\[Content_Types\\]\\.xml|_rels/\\.rels|docProps
31 # skip to the second local file header
32 # since some documents include a 520-byte extra field following the file
33 # header, we need to scan for the next header
34 >>(18.l+49) search/6000 PK\003\004
35 # now skip to the *third* local file header; again, we need to scan due to a
36 # 520-byte extra field following the file header
37 >>>&26 search/6000 PK\003\004
38 # and check the subdirectory name to determine which type of OOXML
39 # file we have. Correct the mimetype with the registered ones:
40 # https://technet.microsoft.com/en-us/library/cc179224.aspx
43 # OpenOffice/Libreoffice orders ZIP entry differently, so check the 4th file
44 >>>>>&26 search/6000 PK\003\004
46 >>>>>>&26 default x Microsoft OOXML
47 >>>>>&26 default x Microsoft OOXML