1 2#------------------------------------------------------------------------------ 3# $File: msooxml,v 1.16 2021/08/16 10:06:55 christos Exp $ 4# msooxml: file(1) magic for Microsoft Office XML 5# From: Ralf Brown <ralf.brown@gmail.com> 6 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 14 150 name msooxml 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 24>0 string AppManifest.xaml Microsoft Silverlight Application 25!:mime application/x-silverlight-app 26 27# start by checking for ZIP local file header signature 280 string PK\003\004 29!:strength +10 30# make sure the first file is correct 31>0x1E use msooxml 32>0x1E default x 33>>0x1E regex \\[Content_Types\\]\\.xml|_rels/\\.rels|docProps 34# skip to the second local file header 35# since some documents include a 520-byte extra field following the file 36# header, we need to scan for the next header 37>>>(18.l+49) search/6000 PK\003\004 38# now skip to the *third* local file header; again, we need to scan due to a 39# 520-byte extra field following the file header 40>>>>&26 search/6000 PK\003\004 41# and check the subdirectory name to determine which type of OOXML 42# file we have. Correct the mimetype with the registered ones: 43# https://technet.microsoft.com/en-us/library/cc179224.aspx 44>>>>>&26 use msooxml 45>>>>>&26 default x 46# OpenOffice/Libreoffice orders ZIP entry differently, so check the 4th file 47>>>>>>&26 search/6000 PK\003\004 48>>>>>>>&26 use msooxml 49>>>>>>>&26 default x Microsoft OOXML 50>>>>>&26 default x Microsoft OOXML 51