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https://issues.apache.org/jira/browse/MIME4J-118?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Markus Wiederkehr updated MIME4J-118:
-------------------------------------

    Attachment: mime4j-118-bytesequence-draft.patch

Oleg, here is a draft of a patch to show what I mean. It is partly based on 
your code.

Not all unit tests pass because with this approach the different writing modes 
no longer make sense.

Notice how ByteSequenceUtil checks if a ByteSequence is actually a 
ByteArrayBuffer for performance optimization like you suggested.

This patch does not include a lenient parsing mode. Please let me know if 
something like this is acceptable then I'll clean it up and add a few more 
details.

> MIME stream parser handles non-ASCII fields incorrectly
> -------------------------------------------------------
>
>                 Key: MIME4J-118
>                 URL: https://issues.apache.org/jira/browse/MIME4J-118
>             Project: JAMES Mime4j
>          Issue Type: Bug
>            Reporter: Oleg Kalnichevski
>            Assignee: Oleg Kalnichevski
>             Fix For: 0.6
>
>         Attachments: mime4j-118-bytesequence-draft.patch, 
> mime4j-118-field.patch, mimej4-118.patch
>
>
> Presently MIME stream parser handles non-ASCII fields incorrectly. Binary 
> field content gets converted to its textual representation too early in the 
> parsing process using simple byte to char cast. The decision about 
> appropriate char encoding should be left up to individual ContentHandler 
> implementations.
> Oleg

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