/src/contrib/boost/asio/detail/buffer_sequence_adapter.hpp
http://pythonocc.googlecode.com/ · C++ Header · 254 lines · 203 code · 40 blank · 11 comment · 20 complexity · 8aa1f39f6c6450c24075b6594c8d645e MD5 · raw file
- //
- // buffer_sequence_adapter.hpp
- // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2010 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/push_options.hpp>
- #include <boost/asio/buffer.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 = 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 = 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& buffers)
- : count_(0), total_buffer_size_(0)
- {
- typename Buffers::const_iterator iter = buffers.begin();
- typename Buffers::const_iterator end = buffers.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& buffers)
- {
- typename Buffers::const_iterator iter = buffers.begin();
- typename Buffers::const_iterator end = buffers.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& buffers)
- {
- typename Buffers::const_iterator iter = buffers.begin();
- typename Buffers::const_iterator end = buffers.end();
- for (; iter != end; ++iter)
- {
- Buffer buffer(*iter);
- boost::asio::buffer_cast<const void*>(buffer);
- }
- }
- static Buffer first(const Buffers& buffers)
- {
- typename Buffers::const_iterator iter = buffers.begin();
- typename Buffers::const_iterator end = buffers.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& buffers)
- {
- init_native_buffer(buffer_, buffers);
- total_buffer_size_ = boost::asio::buffer_size(buffers);
- }
- 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& buffers)
- {
- return boost::asio::buffer_size(buffers) == 0;
- }
- static void validate(const boost::asio::mutable_buffers_1& buffers)
- {
- boost::asio::buffer_cast<const void*>(buffers);
- }
- static Buffer first(const boost::asio::mutable_buffers_1& buffers)
- {
- return Buffer(buffers);
- }
- 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& buffers)
- {
- init_native_buffer(buffer_, buffers);
- total_buffer_size_ = boost::asio::buffer_size(buffers);
- }
- 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& buffers)
- {
- return boost::asio::buffer_size(buffers) == 0;
- }
- static void validate(const boost::asio::const_buffers_1& buffers)
- {
- boost::asio::buffer_cast<const void*>(buffers);
- }
- static Buffer first(const boost::asio::const_buffers_1& buffers)
- {
- return Buffer(buffers);
- }
- private:
- native_buffer_type buffer_;
- std::size_t total_buffer_size_;
- };
- } // namespace detail
- } // namespace asio
- } // namespace boost
- #include <boost/asio/detail/pop_options.hpp>
- #endif // BOOST_ASIO_DETAIL_BUFFER_SEQUENCE_ADAPTER_HPP