[Boost-users] Decompression Problem

From: Robert Vinluan (rvinluan_at_[hidden])
Date: 2006-02-03 09:42:36

Hi All,

I'm trying to decompress only a fragment of an input stream.  I tried 
using boost::iostreams::copy() by passing in a value for the buffer_size 
parameter.

Here's a code example of what I was trying to do:

    filtering_stream<input> in;
    in.push(gzip_decompressor());

    // 'istr' is an istrstream holding the compressed data.
    in.push(istr);

    // I was hoping this would copy only the first 4 decompressed bytes!!
    boost::iostreams::copy(in, cout, 4);

However, when I execute this, the copy() algorithm copies all 
decompressed data, ignoring my 'value' of 4.  Perhaps I've misread the 
documentation?

Anyway, I'm not sure if this is the correct approach to solve the 
problem, or even if there is a solution using boost.

Any suggestions would be helpful.

Thanks in advance,

Rob

P.S. I'm a newbie, so please let me know if this isn't the correct place 
to post this message.