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Diffstat (limited to 'boost/asio/detail/buffer_sequence_adapter.hpp')
| -rw-r--r-- | boost/asio/detail/buffer_sequence_adapter.hpp | 365 |
1 files changed, 365 insertions, 0 deletions
diff --git a/boost/asio/detail/buffer_sequence_adapter.hpp b/boost/asio/detail/buffer_sequence_adapter.hpp new file mode 100644 index 0000000000..562aa55a41 --- /dev/null +++ b/boost/asio/detail/buffer_sequence_adapter.hpp @@ -0,0 +1,365 @@ +// +// detail/buffer_sequence_adapter.hpp +// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +// +// Copyright (c) 2003-2012 Christopher M. Kohlhoff (chris at kohlhoff dot com) +// +// 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) +// + +#ifndef BOOST_ASIO_DETAIL_BUFFER_SEQUENCE_ADAPTER_HPP +#define BOOST_ASIO_DETAIL_BUFFER_SEQUENCE_ADAPTER_HPP + +#if defined(_MSC_VER) && (_MSC_VER >= 1200) +# pragma once +#endif // defined(_MSC_VER) && (_MSC_VER >= 1200) + +#include <boost/asio/detail/config.hpp> +#include <boost/asio/buffer.hpp> +#include <boost/asio/detail/array_fwd.hpp> +#include <boost/asio/detail/socket_types.hpp> + +#include <boost/asio/detail/push_options.hpp> + +namespace boost { +namespace asio { +namespace detail { + +class buffer_sequence_adapter_base +{ +protected: +#if defined(BOOST_WINDOWS) || defined(__CYGWIN__) + typedef WSABUF native_buffer_type; + + static void init_native_buffer(WSABUF& buf, + const boost::asio::mutable_buffer& buffer) + { + buf.buf = boost::asio::buffer_cast<char*>(buffer); + buf.len = static_cast<ULONG>(boost::asio::buffer_size(buffer)); + } + + static void init_native_buffer(WSABUF& buf, + const boost::asio::const_buffer& buffer) + { + buf.buf = const_cast<char*>(boost::asio::buffer_cast<const char*>(buffer)); + buf.len = static_cast<ULONG>(boost::asio::buffer_size(buffer)); + } +#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__) + typedef iovec native_buffer_type; + + static void init_iov_base(void*& base, void* addr) + { + base = addr; + } + + template <typename T> + static void init_iov_base(T& base, void* addr) + { + base = static_cast<T>(addr); + } + + static void init_native_buffer(iovec& iov, + const boost::asio::mutable_buffer& buffer) + { + init_iov_base(iov.iov_base, boost::asio::buffer_cast<void*>(buffer)); + iov.iov_len = boost::asio::buffer_size(buffer); + } + + static void init_native_buffer(iovec& iov, + const boost::asio::const_buffer& buffer) + { + init_iov_base(iov.iov_base, const_cast<void*>( + boost::asio::buffer_cast<const void*>(buffer))); + iov.iov_len = boost::asio::buffer_size(buffer); + } +#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__) +}; + +// Helper class to translate buffers into the native buffer representation. +template <typename Buffer, typename Buffers> +class buffer_sequence_adapter + : buffer_sequence_adapter_base +{ +public: + explicit buffer_sequence_adapter(const Buffers& buffer_sequence) + : count_(0), total_buffer_size_(0) + { + typename Buffers::const_iterator iter = buffer_sequence.begin(); + typename Buffers::const_iterator end = buffer_sequence.end(); + for (; iter != end && count_ < max_buffers; ++iter, ++count_) + { + Buffer buffer(*iter); + init_native_buffer(buffers_[count_], buffer); + total_buffer_size_ += boost::asio::buffer_size(buffer); + } + } + + native_buffer_type* buffers() + { + return buffers_; + } + + std::size_t count() const + { + return count_; + } + + bool all_empty() const + { + return total_buffer_size_ == 0; + } + + static bool all_empty(const Buffers& buffer_sequence) + { + typename Buffers::const_iterator iter = buffer_sequence.begin(); + typename Buffers::const_iterator end = buffer_sequence.end(); + std::size_t i = 0; + for (; iter != end && i < max_buffers; ++iter, ++i) + if (boost::asio::buffer_size(Buffer(*iter)) > 0) + return false; + return true; + } + + static void validate(const Buffers& buffer_sequence) + { + typename Buffers::const_iterator iter = buffer_sequence.begin(); + typename Buffers::const_iterator end = buffer_sequence.end(); + for (; iter != end; ++iter) + { + Buffer buffer(*iter); + boost::asio::buffer_cast<const void*>(buffer); + } + } + + static Buffer first(const Buffers& buffer_sequence) + { + typename Buffers::const_iterator iter = buffer_sequence.begin(); + typename Buffers::const_iterator end = buffer_sequence.end(); + for (; iter != end; ++iter) + { + Buffer buffer(*iter); + if (boost::asio::buffer_size(buffer) != 0) + return buffer; + } + return Buffer(); + } + +private: + // The maximum number of buffers to support in a single operation. + enum { max_buffers = 64 < max_iov_len ? 64 : max_iov_len }; + + native_buffer_type buffers_[max_buffers]; + std::size_t count_; + std::size_t total_buffer_size_; +}; + +template <typename Buffer> +class buffer_sequence_adapter<Buffer, boost::asio::mutable_buffers_1> + : buffer_sequence_adapter_base +{ +public: + explicit buffer_sequence_adapter( + const boost::asio::mutable_buffers_1& buffer_sequence) + { + init_native_buffer(buffer_, Buffer(buffer_sequence)); + total_buffer_size_ = boost::asio::buffer_size(buffer_sequence); + } + + native_buffer_type* buffers() + { + return &buffer_; + } + + std::size_t count() const + { + return 1; + } + + bool all_empty() const + { + return total_buffer_size_ == 0; + } + + static bool all_empty(const boost::asio::mutable_buffers_1& buffer_sequence) + { + return boost::asio::buffer_size(buffer_sequence) == 0; + } + + static void validate(const boost::asio::mutable_buffers_1& buffer_sequence) + { + boost::asio::buffer_cast<const void*>(buffer_sequence); + } + + static Buffer first(const boost::asio::mutable_buffers_1& buffer_sequence) + { + return Buffer(buffer_sequence); + } + +private: + native_buffer_type buffer_; + std::size_t total_buffer_size_; +}; + +template <typename Buffer> +class buffer_sequence_adapter<Buffer, boost::asio::const_buffers_1> + : buffer_sequence_adapter_base +{ +public: + explicit buffer_sequence_adapter( + const boost::asio::const_buffers_1& buffer_sequence) + { + init_native_buffer(buffer_, Buffer(buffer_sequence)); + total_buffer_size_ = boost::asio::buffer_size(buffer_sequence); + } + + native_buffer_type* buffers() + { + return &buffer_; + } + + std::size_t count() const + { + return 1; + } + + bool all_empty() const + { + return total_buffer_size_ == 0; + } + + static bool all_empty(const boost::asio::const_buffers_1& buffer_sequence) + { + return boost::asio::buffer_size(buffer_sequence) == 0; + } + + static void validate(const boost::asio::const_buffers_1& buffer_sequence) + { + boost::asio::buffer_cast<const void*>(buffer_sequence); + } + + static Buffer first(const boost::asio::const_buffers_1& buffer_sequence) + { + return Buffer(buffer_sequence); + } + +private: + native_buffer_type buffer_; + std::size_t total_buffer_size_; +}; + +template <typename Buffer, typename Elem> +class buffer_sequence_adapter<Buffer, boost::array<Elem, 2> > + : buffer_sequence_adapter_base +{ +public: + explicit buffer_sequence_adapter( + const boost::array<Elem, 2>& buffer_sequence) + { + init_native_buffer(buffers_[0], Buffer(buffer_sequence[0])); + init_native_buffer(buffers_[1], Buffer(buffer_sequence[1])); + total_buffer_size_ = boost::asio::buffer_size(buffer_sequence[0]) + + boost::asio::buffer_size(buffer_sequence[1]); + } + + native_buffer_type* buffers() + { + return buffers_; + } + + std::size_t count() const + { + return 2; + } + + bool all_empty() const + { + return total_buffer_size_ == 0; + } + + static bool all_empty(const boost::array<Elem, 2>& buffer_sequence) + { + return boost::asio::buffer_size(buffer_sequence[0]) == 0 + && boost::asio::buffer_size(buffer_sequence[1]) == 0; + } + + static void validate(const boost::array<Elem, 2>& buffer_sequence) + { + boost::asio::buffer_cast<const void*>(buffer_sequence[0]); + boost::asio::buffer_cast<const void*>(buffer_sequence[1]); + } + + static Buffer first(const boost::array<Elem, 2>& buffer_sequence) + { + return Buffer(boost::asio::buffer_size(buffer_sequence[0]) != 0 + ? buffer_sequence[0] : buffer_sequence[1]); + } + +private: + native_buffer_type buffers_[2]; + std::size_t total_buffer_size_; +}; + +#if defined(BOOST_ASIO_HAS_STD_ARRAY) + +template <typename Buffer, typename Elem> +class buffer_sequence_adapter<Buffer, std::array<Elem, 2> > + : buffer_sequence_adapter_base +{ +public: + explicit buffer_sequence_adapter( + const std::array<Elem, 2>& buffer_sequence) + { + init_native_buffer(buffers_[0], Buffer(buffer_sequence[0])); + init_native_buffer(buffers_[1], Buffer(buffer_sequence[1])); + total_buffer_size_ = boost::asio::buffer_size(buffer_sequence[0]) + + boost::asio::buffer_size(buffer_sequence[1]); + } + + native_buffer_type* buffers() + { + return buffers_; + } + + std::size_t count() const + { + return 2; + } + + bool all_empty() const + { + return total_buffer_size_ == 0; + } + + static bool all_empty(const std::array<Elem, 2>& buffer_sequence) + { + return boost::asio::buffer_size(buffer_sequence[0]) == 0 + && boost::asio::buffer_size(buffer_sequence[1]) == 0; + } + + static void validate(const std::array<Elem, 2>& buffer_sequence) + { + boost::asio::buffer_cast<const void*>(buffer_sequence[0]); + boost::asio::buffer_cast<const void*>(buffer_sequence[1]); + } + + static Buffer first(const std::array<Elem, 2>& buffer_sequence) + { + return Buffer(boost::asio::buffer_size(buffer_sequence[0]) != 0 + ? buffer_sequence[0] : buffer_sequence[1]); + } + +private: + native_buffer_type buffers_[2]; + std::size_t total_buffer_size_; +}; + +#endif // defined(BOOST_ASIO_HAS_STD_ARRAY) + +} // namespace detail +} // namespace asio +} // namespace boost + +#include <boost/asio/detail/pop_options.hpp> + +#endif // BOOST_ASIO_DETAIL_BUFFER_SEQUENCE_ADAPTER_HPP |