[Boost-bugs] [Boost C++ Libraries] #5133: Iostreams code_converter buffer

Subject: [Boost-bugs] [Boost C++ Libraries] #5133: Iostreams code_converter buffer
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-01-27 19:29:13

#5133: Iostreams code_converter buffer
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 Reporter:  eddie@…                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |       Owner:  turkanis 
     Type:  Bugs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |      Status:  new      
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  Version:  Boost 1.45.0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |    Severity:  Problem  
 Keywords:  I've been working on converting a the fastcgi++ library over to using  boost::iostreams from std::iostreams and I've noticed some peculiarities  that I can't seem to work passed.  For one, how do you change the buffer size of the code_converter adaptor?  The built in facilities don't seem to actually do anything. I am adding  to a filtering_stream and have noticed that for the following  statements...  stream.push(code_converter<MyDevice>(myDevice), 8192); stream.push(code_converter<MyDevice>(myDevice, 8192)); stream.push(code_converter<MyDevice>(myDevice, 8192), 8192);  All result in a buffer of 128 bytes. I can't figure out a way to actually  change it. I've been monitoring what is going in the myDevice and it is  always 128 byte chunks (or less). If I remove the code_converter from the  stream and go directly in myDevice as per  stream.push(myDevice, 8192);  the buffer is sized as I want it to be and myDevice receives chunks of  data maxing at 8192 bytes.  Secondly, when using the statement  stream.push(code_converter<MyDevice>(myDevice, 8192));  code_converter calls not MyDevice(const MyDevice&) for copying  constructing the object but for some reason MyDevice(const MyDevice&,  const long int&). What is that? Why is code_converter looking for such a  constructor when I specify a buffer size for the code converter?  Thirdly, I can not for the life of me make the code converter flush it's  data. If I call a stream.strict_sync() should the code_converter not get  flushed as well? It doesn't. Everything else in the chain does but the  code_converter won't fully flush until destruction.  |  
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 I've been working on converting a the fastcgi++ library over to using
 boost::iostreams from std::iostreams and I've noticed some peculiarities
 that I can't seem to work passed.

 For one, how do you change the buffer size of the code_converter adaptor?
 The built in facilities don't seem to actually do anything. I am adding
 to a filtering_stream and have noticed that for the following
 statements...

 stream.push(code_converter<MyDevice>(myDevice), 8192);
 stream.push(code_converter<MyDevice>(myDevice, 8192));
 stream.push(code_converter<MyDevice>(myDevice, 8192), 8192);

 All result in a buffer of 128 bytes. I can't figure out a way to actually
 change it. I've been monitoring what is going in the myDevice and it is
 always 128 byte chunks (or less). If I remove the code_converter from the
 stream and go directly in myDevice as per

 stream.push(myDevice, 8192);

 the buffer is sized as I want it to be and myDevice receives chunks of
 data maxing at 8192 bytes.

 Secondly, when using the statement

 stream.push(code_converter<MyDevice>(myDevice, 8192));

 code_converter calls not MyDevice(const MyDevice&) for copying
 constructing the object but for some reason MyDevice(const MyDevice&,
 const long int&). What is that? Why is code_converter looking for such a
 constructor when I specify a buffer size for the code converter?

 Thirdly, I can not for the life of me make the code converter flush it's
 data. If I call a stream.strict_sync() should the code_converter not get
 flushed as well? It doesn't. Everything else in the chain does but the
 code_converter won't fully flush until destruction.

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Ticket URL: <https://svn.boost.org/trac/boost/ticket/5133>
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