[jira] [Commented] (COMPRESS-352) Add snappy decompressor that handles Apple .iwa files

["Stefan Bodewig (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/COMPRESS-352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15271884#comment-15271884 ] 

Stefan Bodewig commented on COMPRESS-352:
-----------------------------------------

This is ugly.

The missing stream identifier defeats autodetection, therefore Tika will need to detect it based on extension and then use {{FramedSnappyCompressorInputStream}} directly - likely using a different constructor that we'll need to add in order to skip the stream identifier and deal with the missing checksums. https://github.com/obriensp/iWorkFileFormat/blob/master/Docs/index.md#iwa says the checksum was only missing from the compressed chunks.

I'll give it a try starting with one of Tika's test files as test case for us as well, but can't promise any time frame.

> Add snappy decompressor that handles Apple .iwa files
> -----------------------------------------------------
>
>                 Key: COMPRESS-352
>                 URL: https://issues.apache.org/jira/browse/COMPRESS-352
>             Project: Commons Compress
>          Issue Type: New Feature
>            Reporter: Tim Allison
>
> On TIKA-1966, one of our users recently shared the newest iOS iWorks files.  They've gotten rid of internal .zip and now rely exclusively on .iwa files.  commons-compress doesn't currently appear to handle these (snappy-compressed?) files...probably because:
> bq. However, the variant of Snappy that is used does not comply with the spec for that format, omitting the stream identifier and checksum.
> from  http://fileformats.archiveteam.org/wiki/IWA
> Any chance you'd be able to modify the snappy decompression to handle Apple's variant?



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