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From "Vladimir Strigun (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-410) method decode(ByteBuffer, CharBuffer, boolean) should set correct position in ByteBuffer
Date Wed, 26 Apr 2006 08:25:03 GMT
    [ http://issues.apache.org/jira/browse/HARMONY-410?page=comments#action_12376425 ] 

Vladimir Strigun commented on HARMONY-410:
------------------------------------------

Hi Richard,

Thanks for the clarification, I agree that streaming decode is good thing, but I'd like to
explain my understanding of specification :)
According to specification of CharsetDecoder decoding operation should process by the following
steps:
"
2. Invoke the decode method zero or more times, as long as additional input may be available,
passing false for the endOfInput argument and filling the input buffer and flushing the output
buffer between invocations; 

3. Invoke the decode method one final time, passing true for the endOfInput argument; and
then 
" 
spec also says:
"The buffers' positions will be advanced to reflect the bytes read and the characters written,
but their marks and limits will not be modified"

I understand these sentences in the next way:
invoke decode with endOfInput = false if you have additional input, then fill the buffer (i.e.
add to buffer some additional input), invoke decode again and pass correct endOfInput parameter
dependent of availability of input. 

Example you provided is very useful and, of course, 1st option looks better, but what I'm
suggest here is to reflect actual processed bytes in input. After first invocation of decode,
not all bytes processed actually, i.e. almost all bytes processed, but some stored in decoder
to further operation. Is it possible to store bytes in decoder, support streaming decoding,
and, at the same time sets correct position in input buffer after each operation?

Thanks.
Vladimir.

> method decode(ByteBuffer, CharBuffer, boolean) should set correct position in ByteBuffer
> ----------------------------------------------------------------------------------------
>
>          Key: HARMONY-410
>          URL: http://issues.apache.org/jira/browse/HARMONY-410
>      Project: Harmony
>         Type: Bug

>   Components: Classlib
>     Reporter: Vladimir Strigun
>     Assignee: Mikhail Loenko
>     Priority: Minor
>  Attachments: Harmony-410_patch.txt, harmony-410_test.txt
>
> When ByteBuffer contain incomplete sequence of bytes for successful decoding, position
in ByteBuffer should be set to latest successful byte. I will attach testcase and patch soon.

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