Hi Sven,

On 15 March 2018 at 12:47, Sven Van Caekenberghe <s...@stfx.eu> wrote:
>
>
>> On 15 Mar 2018, at 12:28, Alistair Grant <akgrant0...@gmail.com> wrote:
>>
>> Hi Guille & Pavel,
>>
>> On 6 Feb Guille changed Base64MimeConverter class>>mimeDecodeToBytes:
>> so that it doesn't reset the dataStream position back to the start of
>> the stream.  This breaks Pavel's PlayingCard, part of FreeCell (you
>> can see that I only load important stuff :-)).
>>
>> PlayingCard class>>initialize
>> "PlayingCard initialize"
>> | forms f |
>> "Read the stored forms from mime-encoded data in imageData."
>> f := Base64MimeConverter mimeDecodeToBytes: (ReadStream on: self imageData).
>> forms := OrderedCollection new.
>> f next = 2 ifFalse: [self error: 'corrupted imageData'].
>> [f atEnd] whileFalse: [forms add: (Form new readFrom: f)].
>> ...
>>
>>
>> Previously, f would be at the start of the stream (which makes sense
>> given this usage), but now it is at the end of the stream, so returns
>> nil and "f next = 2" fails.
>>
>> Guille, can you explain the change.  The commit log just says "make tests 
>> run".
>>
>> Note that a lot of users of this won't fail as they just call
>> #contents of the stream after #mimeDecodeToBytes:, which works
>> regardless of the current position.
>
> So doing
>
>   f reset
>
> at the caller site would fix it then ?

Yes, but I was thinking more about whether it was intended to put this
responsibility on the caller (changing behaviour).


> Note that there is the newer ZnBase64Encoder that can be used as follows:
>
>   f := (ZnBase64Encoder new decode: self imageData) readStream.

That works too.

Thanks,
Alistair

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