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https://issues.apache.org/jira/browse/TIKA-447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12894510#action_12894510
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Nick Burch commented on TIKA-447:
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Alex - have a look at the code, I think it already does what you're asking of
it :)
For OLE2, when we detect the ole2 signature, we load the file into POIFS. We
then ask the detector what it is based on this
For Zip, we look at each entry in the zip file in turn. If it's one we
recognise the name of, and that tells us all we need, we return. Otherwise, we
open up that entry, and grab the mime type from that, and return.
> Container aware mimetype detection
> ----------------------------------
>
> Key: TIKA-447
> URL: https://issues.apache.org/jira/browse/TIKA-447
> Project: Tika
> Issue Type: New Feature
> Components: mime
> Affects Versions: 0.7
> Reporter: Nick Burch
> Attachments: TikaContainerDetection.patch
>
>
> As discussed on the dev list, Tika should ideally have a configurable way to
> process container based formats (eg zip files and ole2 files) when trying to
> detect the correct mime type for a document.
> This needs to be configurable, because some people won't want Tika to have to
> do all the work of parsing the whole file when they're not interested in
> knowing exactly what's in it
> Once we have gone to the trouble of opening and parsing the container file,
> we should try to keep the open container around to speed up parsing of the
> contents
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