[TIKA-913] MagicMime detection of msdos executables does not work

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.1
• Fix Version/s: 1.2
• Component/s: mime
• Labels: detection magic mime

Environment

Linux, JDK 1.6

• Assignee: Unassigned
• Reporter: Torsten Krah
• Created: 07/May/12 13:23
• Updated: 10/May/12 11:52
• Resolved: 10/May/12 11:52

Description

Mime detection does not work as expected (at least from me) in contrast e.g. to sourceforge mime-util detection or "file" utility.
For example using putty ms-dos executable does result in wrong detections:

krah@sf050:~$ java -jar /tmp/tika-app-1.1.jar --detect /tmp/putty
application/octet-stream
krah@sf050:~$ java -jar /tmp/tika-app-1.1.jar --detect /tmp/putty.jpg
image/jpeg
krah@sf050:~$ java -jar /tmp/tika-app-1.1.jar --detect /tmp/putty.exe
application/x-msdownload

Its everytime the same binary resource only with different names.
In contrast using "file" does output:

krah@sf050:~$ file /tmp/putty
/tmp/putty: PE32 executable for MS Windows (GUI) Intel 80386 32-bit
krah@sf050:~$ file /tmp/putty.jpg
/tmp/putty.jpg: PE32 executable for MS Windows (GUI) Intel 80386 32-bit
krah@sf050:~$ file /tmp/putty.exe
/tmp/putty.exe: PE32 executable for MS Windows (GUI) Intel 80386 32-bit

So magic mime detection should be able to detect that this is actually an executable.

E.g. for a PDF it does work:

krah@sf050:~$ java -jar /tmp/tika-app-1.1.jar --detect /tmp/print.pdf
application/pdf
krah@sf050:~$ java -jar /tmp/tika-app-1.1.jar --detect /tmp/print
application/pdf
krah@sf050:~$ java -jar /tmp/tika-app-1.1.jar --detect /tmp/print.jpg
application/pdf

Here Tika detects what is expected.