1 2#------------------------------------------------------------------------------ 3# $File: msooxml,v 1.18 2022/08/16 11:16:39 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!:ext docx 19>0 string ppt/ Microsoft PowerPoint 2007+ 20!:mime application/vnd.openxmlformats-officedocument.presentationml.presentation 21!:ext pptx 22>0 string xl/ Microsoft Excel 2007+ 23!:mime application/vnd.openxmlformats-officedocument.spreadsheetml.sheet 24!:ext xlsx 25>0 string visio/ Microsoft Visio 2013+ 26!:mime application/vnd.ms-visio.drawing.main+xml 27>0 string AppManifest.xaml Microsoft Silverlight Application 28!:mime application/x-silverlight-app 29 30# start by checking for ZIP local file header signature 310 string PK\003\004 32!:strength +10 33# make sure the first file is correct 34>0x1E use msooxml 35>0x1E default x 36>>0x1E regex \\[Content_Types\\]\\.xml|_rels/\\.rels|docProps|customXml 37# skip to the second local file header 38# since some documents include a 520-byte extra field following the file 39# header, we need to scan for the next header 40>>>(18.l+49) search/6000 PK\003\004 41# now skip to the *third* local file header; again, we need to scan due to a 42# 520-byte extra field following the file header 43>>>>&26 search/6000 PK\003\004 44# and check the subdirectory name to determine which type of OOXML 45# file we have. Correct the mimetype with the registered ones: 46# https://technet.microsoft.com/en-us/library/cc179224.aspx 47>>>>>&26 use msooxml 48>>>>>&26 default x 49# OpenOffice/Libreoffice orders ZIP entry differently, so check the 4th file 50>>>>>>&26 search/6000 PK\003\004 51>>>>>>>&26 use msooxml 52# Some OOXML generators add an extra customXml directory. Check another file. 53>>>>>>>&26 default x 54>>>>>>>>&26 search/6000 PK\003\004 55>>>>>>>>>&26 use msooxml 56>>>>>>>>>&26 default x Microsoft OOXML 57>>>>>>>&26 default x Microsoft OOXML 58>>>>>&26 default x Microsoft OOXML 59