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- #------------------------------------------------------------------------------
- # $File: msooxml,v 1.12 2019/04/19 00:42:27 christos Exp $
- # msooxml: file(1) magic for Microsoft Office XML
- # From: Ralf Brown <ralf.brown@gmail.com>
- # .docx, .pptx, and .xlsx are XML plus other files inside a ZIP
- # archive. The first member file is normally "[Content_Types].xml".
- # but some libreoffice generated files put this later. Perhaps skip
- # the "[Content_Types].xml" test?
- # Since MSOOXML doesn't have anything like the uncompressed "mimetype"
- # file of ePub or OpenDocument, we'll have to scan for a filename
- # which can distinguish between the three types
- 0 name msooxml
- >0 string word/ Microsoft Word 2007+
- !:mime application/vnd.openxmlformats-officedocument.wordprocessingml.document
- >0 string ppt/ Microsoft PowerPoint 2007+
- !:mime application/vnd.openxmlformats-officedocument.presentationml.presentation
- >0 string xl/ Microsoft Excel 2007+
- !:mime application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
- # start by checking for ZIP local file header signature
- 0 string PK\003\004
- !:strength +10
- # make sure the first file is correct
- >0x1E use msooxml
- >0x1E regex \\[Content_Types\\]\\.xml|_rels/\\.rels|docProps
- # skip to the second local file header
- # since some documents include a 520-byte extra field following the file
- # header, we need to scan for the next header
- >>(18.l+49) search/6000 PK\003\004
- # now skip to the *third* local file header; again, we need to scan due to a
- # 520-byte extra field following the file header
- >>>&26 search/6000 PK\003\004
- # and check the subdirectory name to determine which type of OOXML
- # file we have. Correct the mimetype with the registered ones:
- # https://technet.microsoft.com/en-us/library/cc179224.aspx
- >>>>&26 use msooxml
- >>>>&26 default x
- # OpenOffice/Libreoffice orders ZIP entry differently, so check the 4th file
- >>>>>&26 search/6000 PK\003\004
- >>>>>>&26 use msooxml
- >>>>>>&26 default x Microsoft OOXML
- >>>>>&26 default x Microsoft OOXML
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