Re: [Help-smalltalk] ZLib streams

[Paolo Bonzini]

> That worked for my small example. But I've tried to implement it in my program
> now and ran into some other problem:
>
>   [socket atEnd not] whileTrue: [self handleData: inputStream nextHunk]
>
> Seemed to block.

You cannot know if the stream is atEnd unless a) it closes, b) you have 
one more byte.  So yes, #atEnd blocks (by design).

I would do something like

   [
     socket atEnd ifTrue: [ ^self ]
     self handleData: inputStream nextHunk
   ] whileFalse.

with #handleData: returning true when it finishes reading a packet.

> You may also note that the call to ZlibReadStream>>#processInput:size: which
> will result in a call to RawInflateStream>>#processInput:size: will receive the
> wrong flag (0 Z_NO_FLUSH or 4 Z_FINISH, and not 2 Z_SYNC_FLUSH) when atEnd
> finally returns.

As far as I could see from the zlib source code, Z_SYNC_FLUSH only 
matters for deflating.  On inflation, it only looks for Z_NO_FLUSH, 
Z_FINISH, Z_BLOCK.

Paolo