boost/asio/impl/write_at.hpp
// // impl/write_at.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_IMPL_WRITE_AT_HPP #define BOOST_ASIO_IMPL_WRITE_AT_HPP #if defined(_MSC_VER) && (_MSC_VER >= 1200) # pragma once #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) #include <boost/asio/buffer.hpp> #include <boost/asio/completion_condition.hpp> #include <boost/asio/detail/base_from_completion_cond.hpp> #include <boost/asio/detail/bind_handler.hpp> #include <boost/asio/detail/consuming_buffers.hpp> #include <boost/asio/detail/handler_alloc_helpers.hpp> #include <boost/asio/detail/handler_invoke_helpers.hpp> #include <boost/asio/detail/throw_error.hpp> #include <boost/asio/detail/push_options.hpp> namespace boost { namespace asio { template <typename SyncRandomAccessWriteDevice, typename ConstBufferSequence, typename CompletionCondition> std::size_t write_at(SyncRandomAccessWriteDevice& d, boost::uint64_t offset, const ConstBufferSequence& buffers, CompletionCondition completion_condition, boost::system::error_code& ec) { ec = boost::system::error_code(); boost::asio::detail::consuming_buffers< const_buffer, ConstBufferSequence> tmp(buffers); std::size_t total_transferred = 0; tmp.prepare(detail::adapt_completion_condition_result( completion_condition(ec, total_transferred))); while (tmp.begin() != tmp.end()) { std::size_t bytes_transferred = d.write_some_at( offset + total_transferred, tmp, ec); tmp.consume(bytes_transferred); total_transferred += bytes_transferred; tmp.prepare(detail::adapt_completion_condition_result( completion_condition(ec, total_transferred))); } return total_transferred; } template <typename SyncRandomAccessWriteDevice, typename ConstBufferSequence> inline std::size_t write_at(SyncRandomAccessWriteDevice& d, boost::uint64_t offset, const ConstBufferSequence& buffers) { boost::system::error_code ec; std::size_t bytes_transferred = write_at( d, offset, buffers, transfer_all(), ec); boost::asio::detail::throw_error(ec); return bytes_transferred; } template <typename SyncRandomAccessWriteDevice, typename ConstBufferSequence, typename CompletionCondition> inline std::size_t write_at(SyncRandomAccessWriteDevice& d, boost::uint64_t offset, const ConstBufferSequence& buffers, CompletionCondition completion_condition) { boost::system::error_code ec; std::size_t bytes_transferred = write_at( d, offset, buffers, completion_condition, ec); boost::asio::detail::throw_error(ec); return bytes_transferred; } #if !defined(BOOST_NO_IOSTREAM) template <typename SyncRandomAccessWriteDevice, typename Allocator, typename CompletionCondition> std::size_t write_at(SyncRandomAccessWriteDevice& d, boost::uint64_t offset, boost::asio::basic_streambuf<Allocator>& b, CompletionCondition completion_condition, boost::system::error_code& ec) { std::size_t bytes_transferred = write_at( d, offset, b.data(), completion_condition, ec); b.consume(bytes_transferred); return bytes_transferred; } template <typename SyncRandomAccessWriteDevice, typename Allocator> inline std::size_t write_at(SyncRandomAccessWriteDevice& d, boost::uint64_t offset, boost::asio::basic_streambuf<Allocator>& b) { boost::system::error_code ec; std::size_t bytes_transferred = write_at(d, offset, b, transfer_all(), ec); boost::asio::detail::throw_error(ec); return bytes_transferred; } template <typename SyncRandomAccessWriteDevice, typename Allocator, typename CompletionCondition> inline std::size_t write_at(SyncRandomAccessWriteDevice& d, boost::uint64_t offset, boost::asio::basic_streambuf<Allocator>& b, CompletionCondition completion_condition) { boost::system::error_code ec; std::size_t bytes_transferred = write_at( d, offset, b, completion_condition, ec); boost::asio::detail::throw_error(ec); return bytes_transferred; } #endif // !defined(BOOST_NO_IOSTREAM) namespace detail { template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence, typename CompletionCondition, typename WriteHandler> class write_at_op : detail::base_from_completion_cond<CompletionCondition> { public: write_at_op(AsyncRandomAccessWriteDevice& device, boost::uint64_t offset, const ConstBufferSequence& buffers, CompletionCondition completion_condition, WriteHandler handler) : detail::base_from_completion_cond< CompletionCondition>(completion_condition), device_(device), offset_(offset), buffers_(buffers), total_transferred_(0), handler_(handler) { } void operator()(const boost::system::error_code& ec, std::size_t bytes_transferred, int start = 0) { switch (start) { case 1: buffers_.prepare(this->check_for_completion(ec, total_transferred_)); for (;;) { device_.async_write_some_at( offset_ + total_transferred_, buffers_, *this); return; default: total_transferred_ += bytes_transferred; buffers_.consume(bytes_transferred); buffers_.prepare(this->check_for_completion(ec, total_transferred_)); if ((!ec && bytes_transferred == 0) || buffers_.begin() == buffers_.end()) break; } handler_(ec, static_cast<const std::size_t&>(total_transferred_)); } } //private: AsyncRandomAccessWriteDevice& device_; boost::uint64_t offset_; boost::asio::detail::consuming_buffers< const_buffer, ConstBufferSequence> buffers_; std::size_t total_transferred_; WriteHandler handler_; }; template <typename AsyncRandomAccessWriteDevice, typename CompletionCondition, typename WriteHandler> class write_at_op<AsyncRandomAccessWriteDevice, boost::asio::mutable_buffers_1, CompletionCondition, WriteHandler> : detail::base_from_completion_cond<CompletionCondition> { public: write_at_op(AsyncRandomAccessWriteDevice& device, boost::uint64_t offset, const boost::asio::mutable_buffers_1& buffers, CompletionCondition completion_condition, WriteHandler handler) : detail::base_from_completion_cond< CompletionCondition>(completion_condition), device_(device), offset_(offset), buffer_(buffers), total_transferred_(0), handler_(handler) { } void operator()(const boost::system::error_code& ec, std::size_t bytes_transferred, int start = 0) { std::size_t n = 0; switch (start) { case 1: n = this->check_for_completion(ec, total_transferred_); for (;;) { device_.async_write_some_at(offset_ + total_transferred_, boost::asio::buffer(buffer_ + total_transferred_, n), *this); return; default: total_transferred_ += bytes_transferred; if ((!ec && bytes_transferred == 0) || (n = this->check_for_completion(ec, total_transferred_)) == 0 || total_transferred_ == boost::asio::buffer_size(buffer_)) break; } handler_(ec, static_cast<const std::size_t&>(total_transferred_)); } } //private: AsyncRandomAccessWriteDevice& device_; boost::uint64_t offset_; boost::asio::mutable_buffer buffer_; std::size_t total_transferred_; WriteHandler handler_; }; template <typename AsyncRandomAccessWriteDevice, typename CompletionCondition, typename WriteHandler> class write_at_op<AsyncRandomAccessWriteDevice, boost::asio::const_buffers_1, CompletionCondition, WriteHandler> : detail::base_from_completion_cond<CompletionCondition> { public: write_at_op(AsyncRandomAccessWriteDevice& device, boost::uint64_t offset, const boost::asio::const_buffers_1& buffers, CompletionCondition completion_condition, WriteHandler handler) : detail::base_from_completion_cond< CompletionCondition>(completion_condition), device_(device), offset_(offset), buffer_(buffers), total_transferred_(0), handler_(handler) { } void operator()(const boost::system::error_code& ec, std::size_t bytes_transferred, int start = 0) { std::size_t n = 0; switch (start) { case 1: n = this->check_for_completion(ec, total_transferred_); for (;;) { device_.async_write_some_at(offset_ + total_transferred_, boost::asio::buffer(buffer_ + total_transferred_, n), *this); return; default: total_transferred_ += bytes_transferred; if ((!ec && bytes_transferred == 0) || (n = this->check_for_completion(ec, total_transferred_)) == 0 || total_transferred_ == boost::asio::buffer_size(buffer_)) break; } handler_(ec, static_cast<const std::size_t&>(total_transferred_)); } } //private: AsyncRandomAccessWriteDevice& device_; boost::uint64_t offset_; boost::asio::const_buffer buffer_; std::size_t total_transferred_; WriteHandler handler_; }; template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence, typename CompletionCondition, typename WriteHandler> inline void* asio_handler_allocate(std::size_t size, write_at_op<AsyncRandomAccessWriteDevice, ConstBufferSequence, CompletionCondition, WriteHandler>* this_handler) { return boost_asio_handler_alloc_helpers::allocate( size, this_handler->handler_); } template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence, typename CompletionCondition, typename WriteHandler> inline void asio_handler_deallocate(void* pointer, std::size_t size, write_at_op<AsyncRandomAccessWriteDevice, ConstBufferSequence, CompletionCondition, WriteHandler>* this_handler) { boost_asio_handler_alloc_helpers::deallocate( pointer, size, this_handler->handler_); } template <typename Function, typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence, typename CompletionCondition, typename WriteHandler> inline void asio_handler_invoke(const Function& function, write_at_op<AsyncRandomAccessWriteDevice, ConstBufferSequence, CompletionCondition, WriteHandler>* this_handler) { boost_asio_handler_invoke_helpers::invoke( function, this_handler->handler_); } } // namespace detail template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence, typename CompletionCondition, typename WriteHandler> inline void async_write_at(AsyncRandomAccessWriteDevice& d, boost::uint64_t offset, const ConstBufferSequence& buffers, CompletionCondition completion_condition, WriteHandler handler) { detail::write_at_op<AsyncRandomAccessWriteDevice, ConstBufferSequence, CompletionCondition, WriteHandler>( d, offset, buffers, completion_condition, handler)( boost::system::error_code(), 0, 1); } template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence, typename WriteHandler> inline void async_write_at(AsyncRandomAccessWriteDevice& d, boost::uint64_t offset, const ConstBufferSequence& buffers, WriteHandler handler) { async_write_at(d, offset, buffers, transfer_all(), handler); } #if !defined(BOOST_NO_IOSTREAM) namespace detail { template <typename AsyncRandomAccessWriteDevice, typename Allocator, typename WriteHandler> class write_at_streambuf_op { public: write_at_streambuf_op( boost::asio::basic_streambuf<Allocator>& streambuf, WriteHandler handler) : streambuf_(streambuf), handler_(handler) { } void operator()(const boost::system::error_code& ec, const std::size_t bytes_transferred) { streambuf_.consume(bytes_transferred); handler_(ec, bytes_transferred); } //private: boost::asio::basic_streambuf<Allocator>& streambuf_; WriteHandler handler_; }; template <typename AsyncRandomAccessWriteDevice, typename Allocator, typename WriteHandler> inline void* asio_handler_allocate(std::size_t size, write_at_streambuf_op<AsyncRandomAccessWriteDevice, Allocator, WriteHandler>* this_handler) { return boost_asio_handler_alloc_helpers::allocate( size, this_handler->handler_); } template <typename AsyncRandomAccessWriteDevice, typename Allocator, typename WriteHandler> inline void asio_handler_deallocate(void* pointer, std::size_t size, write_at_streambuf_op<AsyncRandomAccessWriteDevice, Allocator, WriteHandler>* this_handler) { boost_asio_handler_alloc_helpers::deallocate( pointer, size, this_handler->handler_); } template <typename Function, typename AsyncRandomAccessWriteDevice, typename Allocator, typename WriteHandler> inline void asio_handler_invoke(const Function& function, write_at_streambuf_op<AsyncRandomAccessWriteDevice, Allocator, WriteHandler>* this_handler) { boost_asio_handler_invoke_helpers::invoke( function, this_handler->handler_); } } // namespace detail template <typename AsyncRandomAccessWriteDevice, typename Allocator, typename CompletionCondition, typename WriteHandler> inline void async_write_at(AsyncRandomAccessWriteDevice& d, boost::uint64_t offset, boost::asio::basic_streambuf<Allocator>& b, CompletionCondition completion_condition, WriteHandler handler) { async_write_at(d, offset, b.data(), completion_condition, detail::write_at_streambuf_op< AsyncRandomAccessWriteDevice, Allocator, WriteHandler>(b, handler)); } template <typename AsyncRandomAccessWriteDevice, typename Allocator, typename WriteHandler> inline void async_write_at(AsyncRandomAccessWriteDevice& d, boost::uint64_t offset, boost::asio::basic_streambuf<Allocator>& b, WriteHandler handler) { async_write_at(d, offset, b, transfer_all(), handler); } #endif // !defined(BOOST_NO_IOSTREAM) } // namespace asio } // namespace boost #include <boost/asio/detail/pop_options.hpp> #endif // BOOST_ASIO_IMPL_WRITE_AT_HPP