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POWhy is boost::asio::read buffer data size lesser than read size?
 

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  1. POWhy is boost::asio::read buffer data size lesser than read size?
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    <p>I have a simple file transfer application, which transfers 4096 bytes per write from the client. In the server end, I am using the following call read</p> <p>tempLen = boost::asio::read(l_Socket, boost::asio::buffer(buf, bufSize), boost::asio::transfer_all(), error);</p> <p>The templen is 1440 bytes, but when I read the buf, it is only 11 bytes. Copy pasting the server code below. I have tried both socket.read_some and asio::read - both end in same result. Can someone explain what am I doing wrong here?</p> <pre><code>//boost::array&lt;char, 4096&gt; buf; char* buf = new char[4096]; char* bigBuffer = new char[2097152]; std::string strBuffer; strBuffer.clear(); for (;;) // Loop for the whole file length { boost::asio::read_until(l_Socket, request_buf, "\n\n"); std::istream request_stream(&amp;request_buf); request_stream &gt;&gt; bufSize; std::cout&lt;&lt; "Size of the Compressed data transfer:" &lt;&lt; bufSize &lt;&lt; "\n"; // Clear the stream request_stream.clear(); memset(bigBuffer, 0, 2097152); memset(buf, 0, 4096); if(bufSize == 0) break; size_t len = 0, prevLen = 0, tempLen = 0; try{ //tempLen = l_Socket.read_some(boost::asio::buffer(buf, bufSize), error); tempLen = boost::asio::read(l_Socket, boost::asio::buffer(buf, bufSize), boost::asio::transfer_all(), error); std::cout &lt;&lt; "Length from read: " &lt;&lt; tempLen &lt;&lt; " Buffer Size: " &lt;&lt; bufSize &lt;&lt; std::endl; prevLen = len; len += tempLen; } catch (boost::exception&amp; e) { std::cerr &lt;&lt; diagnostic_information(e); }.....} </code></pre> <p>Edit: </p> <p>Just checked this problem is happening only when I send the data compressed with the following function at the client.</p> <pre><code> std::string CClient::Compress(const char* data, unsigned int* dataLen) { std::stringstream compressed; std::stringstream decompressed; std::cout &lt;&lt; "From Compress Function: " &lt;&lt; " Size of Decompressed Data: " &lt;&lt; strlen(data) &lt;&lt; std::endl; decompressed &lt;&lt; data; boost::iostreams::filtering_streambuf&lt;boost::iostreams::input&gt; out; out.push(boost::iostreams::zlib_compressor()); out.push(decompressed); boost::iostreams::copy(out, compressed); *dataLen = compressed.str().size(); return compressed.str(); } std::string CClient::DeCompress(const std::string&amp; data) { std::stringstream compressed; std::stringstream decompressed; compressed &lt;&lt; data; boost::iostreams::filtering_streambuf&lt;boost::iostreams::input&gt; in; in.push(boost::iostreams::zlib_decompressor()); in.push(compressed); boost::iostreams::copy(in, decompressed); std::cout &lt;&lt; "Decompressed Data: " &lt;&lt; decompressed.str().c_str() &lt;&lt; std::endl; return decompressed.str(); } </code></pre> <p>When I decompress the data at "the client" itself after compression(before sending), the data is getting printed properly. But when I read the data after receiving at the server, I am facing this problem.</p>
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    1. USSivaram Kannan
    1. USSivaram Kannan
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    1. COYou'll get more attention by tagging your questions with the language you are using.
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    2. COJ.N - Thanks for the advice. Will keep that in mind.
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