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POBoost Iostreams zlib_error with Custom Source
 

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  1. POBoost Iostreams zlib_error with Custom Source
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    <p>I am trying to use a <code>zlib_decompressor</code> to decompress data through an <code>istreambuf_iterator</code>. I couldn't find an in built way to use an input iterator as input to a stream (please point out a way if one exists already) so I wrote this source: </p> <pre><code>template &lt;class cha_type, class iterator_type&gt; class IteratorSource { public: typedef cha_type char_type; typedef boost::iostreams::source_tag category; iterator_type&amp; i; iterator_type eof; IteratorSource(iterator_type&amp; it, iterator_type end) : i(it), eof(end) { } std::streamsize read(char* s, std::streamsize n) { for(int j = 0; j &lt; n; j++) { if(i == eof) { std::cout &lt;&lt; "Reached eof after " &lt;&lt; j &lt;&lt; " bytes\n"; return -1; } char next = *i++; std::cout &lt;&lt; "Reading " &lt;&lt; next &lt;&lt; "\n"; *s++ = next; } return n; } }; </code></pre> <p>And used it like this:</p> <pre><code>int main() { std::vector&lt;char&gt; data_back = {'\x78', '\x9c', '\x73', '\x04', '\x00', '\x00', '\x42', '\x00', '\x42'}; auto start = data_back.begin(); IteratorSource&lt;char, decltype(data_back)::iterator&gt; data(start, data_back.end()); boost::iostreams::filtering_istreambuf def; def.push(boost::iostreams::zlib_decompressor()); def.push(data); boost::iostreams::copy(def, std::cout); return 0; } </code></pre> <p>To give this output:</p> <pre><code>Reading x Reading � Reading s Reading Reading Reading Reading B Reading Reading B Reached eof after 9 bytes terminate called after throwing an instance of 'boost::exception_detail::clone_impl&lt;boost::exception_detail::error_info_injector&lt;boost::iostreams::zlib_error&gt; &gt;' what(): zlib error Aborted (core dumped) </code></pre> <p>I am not sure why this is producing an error because loading from a file works fine.</p>
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