2 #------------------------------------------------------------------------------
3 # $File: msooxml,v 1.1 2011/01/25 18:36:19 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 # Since MSOOXML doesn't have anything like the uncompressed "mimetype"
10 # file of ePub or OpenDocument, we'll have to scan for a filename
11 # which can distinguish between the three types
13 # start by checking for ZIP local file header signature
15 # make sure the first file is correct
16 >0x1E string [Content_Types].xml
17 # skip to the second local file header
18 # since some documents include a 520-byte extra field following the file
19 # header, we need to scan for the next header
20 >>(18.l+49) search/2000 PK\003\004
21 # now skip to the *third* local file header; again, we need to scan due to a
22 # 520-byte extra field following the file header
23 >>>&26 search/1000 PK\003\004
24 # and check the subdirectory name to determine which type of OOXML
26 >>>>&26 string word/ Microsoft Word 2007+
27 !:mime application/msword
28 >>>>&26 string ppt/ Microsoft PowerPoint 2007+
29 !:mime application/vnd.ms-powerpoint
30 >>>>&26 string xl/ Microsoft Excel 2007+
31 !:mime application/vnd.ms-excel
32 >>>>&26 default x Microsoft OOXML