// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
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// (C) Copyright 2005-2007 Jonathan Turkanis
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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// See http://www.boost.org/libs/iostreams for documentation.
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#ifndef BOOST_IOSTREAMS_DETAIL_COUNTED_ARRAY_HPP_INCLUDED
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#define BOOST_IOSTREAMS_DETAIL_COUNTED_ARRAY_HPP_INCLUDED
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#include <algorithm> // min.
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#include <cstddef> // size_t
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#include <string> // char_traits
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#include <boost/iostreams/categories.hpp>
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#include <boost/iostreams/detail/char_traits.hpp>
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#include <boost/iostreams/detail/ios.hpp> // streamsize.
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namespace boost { namespace iostreams { namespace detail {
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template<typename Ch>
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class counted_array_source {
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public:
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typedef Ch char_type;
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typedef source_tag category;
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counted_array_source(const Ch* buf, std::streamsize size)
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: buf_(buf), ptr_(0), end_(size)
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{ }
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std::streamsize read(Ch* s, std::streamsize n)
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{
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using namespace std;
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streamsize result = (std::min)(n, end_ - ptr_);
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char_traits<char_type>::copy(
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s,
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buf_ + ptr_,
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static_cast<size_t>(result)
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);
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ptr_ += result;
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return result;
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}
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std::streamsize count() const { return ptr_; }
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private:
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const Ch* buf_;
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std::streamsize ptr_, end_;
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};
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template<typename Ch>
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struct counted_array_sink {
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public:
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typedef Ch char_type;
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typedef sink_tag category;
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counted_array_sink(Ch* buf, std::streamsize size)
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: buf_(buf), ptr_(0), end_(size)
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{ }
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std::streamsize write(const Ch* s, std::streamsize n)
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{
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using namespace std;
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std::streamsize result = (std::min)(n, end_ - ptr_);
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char_traits<char_type>::copy(
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buf_ + ptr_,
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s,
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static_cast<size_t>(result)
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);
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ptr_ += result;
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return result;
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}
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std::streamsize count() const { return ptr_; }
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private:
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Ch* buf_;
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std::streamsize ptr_, end_;
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};
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} } } // End namespaces iostreams, boost.
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#endif // #ifndef BOOST_IOSTREAMS_DETAIL_COUNTED_ARRAY_HPP_INCLUDED
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