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Diffstat (limited to 'src/boost/libs/iostreams/example/container_device.hpp')
-rw-r--r-- | src/boost/libs/iostreams/example/container_device.hpp | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/src/boost/libs/iostreams/example/container_device.hpp b/src/boost/libs/iostreams/example/container_device.hpp new file mode 100644 index 000000000..cb9d537f2 --- /dev/null +++ b/src/boost/libs/iostreams/example/container_device.hpp @@ -0,0 +1,160 @@ +// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) +// (C) Copyright 2005-2007 Jonathan Turkanis +// Distributed under the Boost Software License, Version 1.0. (See accompanying +// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) + +// See http://www.boost.org/libs/iostreams for documentation. + +#ifndef BOOST_IOSTREAMS_EXAMPLE_CONTAINTER_DEVICE_HPP_INCLUDED +#define BOOST_IOSTREAMS_EXAMPLE_CONTAINTER_DEVICE_HPP_INCLUDED + +#include <algorithm> // copy, min. +#include <cassert> +#include <boost/config.hpp> // BOOST_NO_STDC_NAMESPACE. +#include <boost/iostreams/categories.hpp> +#include <boost/iostreams/detail/ios.hpp> // failure. + +// Must come last. +#include <boost/iostreams/detail/config/disable_warnings.hpp> + +namespace boost { namespace iostreams { namespace example { + +// +// Model of Source which reads from an STL-compatible sequence +// whose iterators are random-access iterators. +// +template<typename Container> +class container_source { +public: + typedef typename Container::value_type char_type; + typedef source_tag category; + container_source(Container& container) + : container_(container), pos_(0) + { } + std::streamsize read(char_type* s, std::streamsize n) + { + using namespace std; + std::streamsize amt = + static_cast<std::streamsize>(container_.size() - pos_); + std::streamsize result = (min)(n, amt); + if (result != 0) { + std::copy( container_.begin() + pos_, + container_.begin() + pos_ + result, + s ); + pos_ += result; + return result; + } else { + return -1; // EOF + } + } + Container& container() { return container_; } +private: + container_source operator=(const container_source&); + typedef typename Container::size_type size_type; + Container& container_; + size_type pos_; +}; + +// +// Model of Sink which appends to an STL-compatible sequence. +// +template<typename Container> +class container_sink { +public: + typedef typename Container::value_type char_type; + typedef sink_tag category; + container_sink(Container& container) : container_(container) { } + std::streamsize write(const char_type* s, std::streamsize n) + { + container_.insert(container_.end(), s, s + n); + return n; + } + Container& container() { return container_; } +private: + container_sink operator=(const container_sink&); + Container& container_; +}; + +// +// Model of SeekableDevice which accessS an TL-compatible sequence +// whose iterators are random-access iterators. +// +template<typename Container> +class container_device { +public: + typedef typename Container::value_type char_type; + typedef seekable_device_tag category; + container_device(Container& container) + : container_(container), pos_(0) + { } + + std::streamsize read(char_type* s, std::streamsize n) + { + using namespace std; + std::streamsize amt = + static_cast<std::streamsize>(container_.size() - pos_); + std::streamsize result = (min)(n, amt); + if (result != 0) { + std::copy( container_.begin() + pos_, + container_.begin() + pos_ + result, + s ); + pos_ += result; + return result; + } else { + return -1; // EOF + } + } + std::streamsize write(const char_type* s, std::streamsize n) + { + using namespace std; + std::streamsize result = 0; + if (pos_ != container_.size()) { + std::streamsize amt = + static_cast<std::streamsize>(container_.size() - pos_); + result = (min)(n, amt); + std::copy(s, s + result, container_.begin() + pos_); + pos_ += result; + } + if (result < n) { + container_.insert(container_.end(), s, s + n); + pos_ = container_.size(); + } + return n; + } + stream_offset seek(stream_offset off, BOOST_IOS::seekdir way) + { + using namespace std; + + // Determine new value of pos_ + stream_offset next; + if (way == BOOST_IOS::beg) { + next = off; + } else if (way == BOOST_IOS::cur) { + next = pos_ + off; + } else if (way == BOOST_IOS::end) { + next = container_.size() + off - 1; + } else { + throw BOOST_IOSTREAMS_FAILURE("bad seek direction"); + } + + // Check for errors + if (next < 0 || next > static_cast<stream_offset>(container_.size())) + throw BOOST_IOSTREAMS_FAILURE("bad seek offset"); + + pos_ = next; + return pos_; + } + + Container& container() { return container_; } +private: + container_device operator=(const container_device&); + typedef typename Container::size_type size_type; + Container& container_; + size_type pos_; +}; + +} } } // End namespaces example, iostreams, boost. + +#include <boost/iostreams/detail/config/enable_warnings.hpp> + +#endif // #ifndef BOOST_IOSTREAMS_EXAMPLE_CONTAINTER_DEVICE_HPP_INCLUDED |