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https://issues.apache.org/jira/browse/TIKA-1446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14178889#comment-14178889
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Bin Hawking commented on TIKA-1446:
-----------------------------------

The above attached is my fix, which is the old or new code in 
tika-1.6\tika-parsers\src\main\java\org\apache\tika\parser\chm\

Please use diff to see my changes. 

This fix addresses TIKA- 1430, 1446, 1447, 1448.

NOTE: My fix is not well tested and may be incomplete. And, because I am adding 
new features to the chm parser for my own application,including parsing HHK and 
HHC files for more metadata; there are some distractions in my revisions which 
are not applicable to the original tika project. Sorry for the inconvenience.


> CHM parser : wrong decompression of aligned blocks
> --------------------------------------------------
>
>                 Key: TIKA-1446
>                 URL: https://issues.apache.org/jira/browse/TIKA-1446
>             Project: Tika
>          Issue Type: Bug
>    Affects Versions: 1.7
>            Reporter: Bin Hawking
>            Priority: Critical
>         Attachments: chm.zip
>
>
> If an embedded file contains aligned blocks, the parser outputs chaotic text 
> or empty text as to this file.
> I have fixed it myself, corrected decompressAlignedBlock() and its 
> preparation methods. Mostly this bug is due to misusing main tree/align 
> tree/length tree. And some tree is built wrong.



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