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#------------------------------------------------------------------------------
# $File: msooxml,v 1.18 2022/08/16 11:16:39 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
!:ext docx
>0 string ppt/ Microsoft PowerPoint 2007+
!:mime application/vnd.openxmlformats-officedocument.presentationml.presentation
!:ext pptx
>0 string xl/ Microsoft Excel 2007+
!:mime application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
!:ext xlsx
>0 string visio/ Microsoft Visio 2013+
!:mime application/vnd.ms-visio.drawing.main+xml
>0 string AppManifest.xaml Microsoft Silverlight Application
!:mime application/x-silverlight-app
# 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 default x
>>0x1E regex \\[Content_Types\\]\\.xml|_rels/\\.rels|docProps|customXml
# 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
# Some OOXML generators add an extra customXml directory. Check another file.
>>>>>>>&26 default x
>>>>>>>>&26 search/6000 PK\003\004
>>>>>>>>>&26 use msooxml
>>>>>>>>>&26 default x Microsoft OOXML
>>>>>>>&26 default x Microsoft OOXML
>>>>>&26 default x Microsoft OOXML
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