On Sat, Dec 10, 2011 at 2:39 AM, John McIntosh <johnmci@smalltalkconsulting.com> wrote:

Mmm I recall a problem from long ago where the buffer passed into the
zip call was not big enough to store the results.
If you pass in a small chunk of data, why the buffer to hold the
results and the decode data is bigger than the buffer going in.
So the two sizes, input and output are?

Hi John. For writing we are using a particular buffered write stream which then delegates to the orignal stream. So at the end we should be doing the equivalent of:
GZipWriteStream on: (ByteArray new writeStream). That's the default for testing, then you could also do GZipWriteStream on a StandardStream...

Anyway, our write buffer has this method:

FLBufferedWriteStream >> flushBuffer
�� position = 0 ifTrue: [ ^ self ].
�� position = buffer size
�� ifTrue: [
�� stream nextPutAll: buffer ]
�� ifFalse: [
�� streamRespondsToNextPutAllStartingAt
�� ifTrue: [ stream next: position putAll: buffer startingAt: 1 ]
�� ifFalse: [ stream nextPutAll: (buffer copyFrom: 1 to: position) ] ].
�� position := 0

From what I can see in the stack, it is crasing here when it sends� "stream next: position putAll: buffer startingAt: 1"
I put some flags here and 'buffer' size is 4096� (we choose that value) and the position was for example 325.

Is this what you asked or did I misunderstand ?

Thanks in advance!

�

On Fri, Dec 2, 2011 at 4:41 PM, Mariano Martinez Peck
<marianopeck@gmail.com> wrote:

> Hi guys. We are doing some experiments with Fuel and GZip streams... Now I
> have a beatiful test like this:
>
> testMethodContextThisContext
>
> �� | materializedContext context |
> �� context := thisContext copy.
> �� materializedContext := self resultOfSerializeAndMaterialize: context.
>
> and it crashes like crazy. From the VM crash stack, I can see:
>
>
> Smalltalk stack dump:
> 0xbff66ba4 M GZipWriteStream(DeflateStream)>deflateBlock 447551436: a(n)
> GZipWriteStream
> 0xbff66bc8 M GZipWriteStream(DeflateStream)>nextPutAll: 447551436: a(n)
> GZipWriteStream
> 0xbff66be4 M GZipWriteStream(DeflateStream)>next:putAll:startingAt:
> 447551436: a(n) GZipWriteStream
> 0xbff66c08 M FLBufferedWriteStream>flushBuffer 448048664: a(n)
> FLBufferedWriteStream
> 0xbff66c20 M FLBufferedWriteStream>nextBytesPutAll: 448048664: a(n)
> FLBufferedWriteStream
> 0xbff66c40 M FLBufferedWriteStream>nextStringPut: 448048664: a(n)
> FLBufferedWriteStream
> 0xbff66c5c M FLByteStringCluster>serialize:on: 448054196: a(n)
> FLByteStringCluster
> 0xbff66c7c M FLByteStringCluster(FLPrimitiveCluster)>serializeInstance:with:
> 448054196: a(n) FLByteStringCluster
> 0xbff66ca0 M [] in
> FLByteStringCluster(FLIteratingCluster)>serializeInstances: 448054196: a(n)
> FLByteStringCluster
> 0xbff66cc8 M IdentitySet(Set)>do: 451711680: a(n) IdentitySet
> 0xbff66ce4 M FLByteStringCluster(FLIteratingCluster)>serializeInstances:
> 448054196: a(n) FLByteStringCluster
> 0xbff66d00 M
> FLByteStringCluster(FLIteratingCluster)>serializeInstancesStepWith:
> 448054196: a(n) FLByteStringCluster
> 0xbff66d1c M FLSerialization>clusterInstancesStepOf: 448053428: a(n)
> FLSerialization
> 0xbff66d38 M [] in FLSerialization>instancesStep 448053428: a(n)
> FLSerialization
> 0xbff66d58 M OrderedCollection>do: 449989736: a(n) OrderedCollection
> 0xbff66d74 M FLSerialization>instancesStep 448053428: a(n) FLSerialization
> 0xbff66d8c M FLSerialization>run 448053428: a(n) FLSerialization
> 0xbff66db0 I [] in FLSerializer>defaultSerialization 447550464: a(n)
> FLSerializer
> 0xbff66dd8 M [] in FLSerializer>serialize:on: 447550464: a(n) FLSerializer
> 0xbff66df8 M BlockClosure>ensure: 448052884: a(n) BlockClosure
> 0xbff66e18 M FLSerializer>serialize:on: 447550464: a(n) FLSerializer
> 0xbff66e3c M [] in
> FLMethodContextSerializationTest(FLSerializationTest)>serialize: 447235380:
> a(n) FLMethodContextSerializationTest
> 0xbff66e60 M [] in GZipWriteStream class(PositionableStream class)>on:do:
> 419845144: a(n) GZipWriteStream class
> 0xbff66e80 M BlockClosure>ensure: 448048616: a(n) BlockClosure
> 0xbff66ea0 M GZipWriteStream class(PositionableStream class)>on:do:
> 419845144: a(n) GZipWriteStream class
> 0xbff66ec4 M [] in FLGZipStrategy>writeStreamDo: 447550896: a(n)
> FLGZipStrategy
> 0xbff66ee0 M FLByteArrayStreamStrategy>writeStreamDo: 447550884: a(n)
> FLByteArrayStreamStrategy
> 0xbff66efc M FLGZipStrategy>writeStreamDo: 447550896: a(n) FLGZipStrategy
> 0xbff66f18 M
> FLMethodContextSerializationTest(FLSerializationTest)>serialize: 447235380:
> a(n) FLMethodContextSerializationTest
> 0xbff66f34 M
> FLMethodContextSerializationTest(FLSerializationTest)>resultOfSerializeAndMaterialize:
> 447235380: a(n) FLMethodContextSerializationTest
> 0xbff66f58 M FLMethodContextSerializationTest>testMethodContextThisContext
> 447235380: a(n) FLMethodContextSerializationTest
>
>
> any idea of where I should start to look at?
>
> Thanks
>
>
> --
> Mariano
> http://marianopeck.wordpress.com
>

--
===========================================================================
John M. McIntosh <johnmci@smalltalkconsulting.com>
Corporate Smalltalk Consulting Ltd.� http://www.smalltalkconsulting.com
===========================================================================