| // |
| // impl/buffered_read_stream.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2021 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_BUFFERED_READ_STREAM_HPP |
| #define BOOST_ASIO_IMPL_BUFFERED_READ_STREAM_HPP |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
| # pragma once |
| #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
| |
| #include <boost/asio/associated_allocator.hpp> |
| #include <boost/asio/associated_executor.hpp> |
| #include <boost/asio/detail/handler_alloc_helpers.hpp> |
| #include <boost/asio/detail/handler_cont_helpers.hpp> |
| #include <boost/asio/detail/handler_invoke_helpers.hpp> |
| #include <boost/asio/detail/handler_type_requirements.hpp> |
| #include <boost/asio/detail/non_const_lvalue.hpp> |
| #include <boost/asio/detail/type_traits.hpp> |
| |
| #include <boost/asio/detail/push_options.hpp> |
| |
| namespace boost { |
| namespace asio { |
| |
| template <typename Stream> |
| std::size_t buffered_read_stream<Stream>::fill() |
| { |
| detail::buffer_resize_guard<detail::buffered_stream_storage> |
| resize_guard(storage_); |
| std::size_t previous_size = storage_.size(); |
| storage_.resize(storage_.capacity()); |
| storage_.resize(previous_size + next_layer_.read_some(buffer( |
| storage_.data() + previous_size, |
| storage_.size() - previous_size))); |
| resize_guard.commit(); |
| return storage_.size() - previous_size; |
| } |
| |
| template <typename Stream> |
| std::size_t buffered_read_stream<Stream>::fill(boost::system::error_code& ec) |
| { |
| detail::buffer_resize_guard<detail::buffered_stream_storage> |
| resize_guard(storage_); |
| std::size_t previous_size = storage_.size(); |
| storage_.resize(storage_.capacity()); |
| storage_.resize(previous_size + next_layer_.read_some(buffer( |
| storage_.data() + previous_size, |
| storage_.size() - previous_size), |
| ec)); |
| resize_guard.commit(); |
| return storage_.size() - previous_size; |
| } |
| |
| namespace detail |
| { |
| template <typename ReadHandler> |
| class buffered_fill_handler |
| { |
| public: |
| buffered_fill_handler(detail::buffered_stream_storage& storage, |
| std::size_t previous_size, ReadHandler& handler) |
| : storage_(storage), |
| previous_size_(previous_size), |
| handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(handler)) |
| { |
| } |
| |
| #if defined(BOOST_ASIO_HAS_MOVE) |
| buffered_fill_handler(const buffered_fill_handler& other) |
| : storage_(other.storage_), |
| previous_size_(other.previous_size_), |
| handler_(other.handler_) |
| { |
| } |
| |
| buffered_fill_handler(buffered_fill_handler&& other) |
| : storage_(other.storage_), |
| previous_size_(other.previous_size_), |
| handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(other.handler_)) |
| { |
| } |
| #endif // defined(BOOST_ASIO_HAS_MOVE) |
| |
| void operator()(const boost::system::error_code& ec, |
| const std::size_t bytes_transferred) |
| { |
| storage_.resize(previous_size_ + bytes_transferred); |
| handler_(ec, bytes_transferred); |
| } |
| |
| //private: |
| detail::buffered_stream_storage& storage_; |
| std::size_t previous_size_; |
| ReadHandler handler_; |
| }; |
| |
| template <typename ReadHandler> |
| inline asio_handler_allocate_is_deprecated |
| asio_handler_allocate(std::size_t size, |
| buffered_fill_handler<ReadHandler>* this_handler) |
| { |
| #if defined(BOOST_ASIO_NO_DEPRECATED) |
| boost_asio_handler_alloc_helpers::allocate(size, this_handler->handler_); |
| return asio_handler_allocate_is_no_longer_used(); |
| #else // defined(BOOST_ASIO_NO_DEPRECATED) |
| return boost_asio_handler_alloc_helpers::allocate( |
| size, this_handler->handler_); |
| #endif // defined(BOOST_ASIO_NO_DEPRECATED) |
| } |
| |
| template <typename ReadHandler> |
| inline asio_handler_deallocate_is_deprecated |
| asio_handler_deallocate(void* pointer, std::size_t size, |
| buffered_fill_handler<ReadHandler>* this_handler) |
| { |
| boost_asio_handler_alloc_helpers::deallocate( |
| pointer, size, this_handler->handler_); |
| #if defined(BOOST_ASIO_NO_DEPRECATED) |
| return asio_handler_deallocate_is_no_longer_used(); |
| #endif // defined(BOOST_ASIO_NO_DEPRECATED) |
| } |
| |
| template <typename ReadHandler> |
| inline bool asio_handler_is_continuation( |
| buffered_fill_handler<ReadHandler>* this_handler) |
| { |
| return boost_asio_handler_cont_helpers::is_continuation( |
| this_handler->handler_); |
| } |
| |
| template <typename Function, typename ReadHandler> |
| inline asio_handler_invoke_is_deprecated |
| asio_handler_invoke(Function& function, |
| buffered_fill_handler<ReadHandler>* this_handler) |
| { |
| boost_asio_handler_invoke_helpers::invoke( |
| function, this_handler->handler_); |
| #if defined(BOOST_ASIO_NO_DEPRECATED) |
| return asio_handler_invoke_is_no_longer_used(); |
| #endif // defined(BOOST_ASIO_NO_DEPRECATED) |
| } |
| |
| template <typename Function, typename ReadHandler> |
| inline asio_handler_invoke_is_deprecated |
| asio_handler_invoke(const Function& function, |
| buffered_fill_handler<ReadHandler>* this_handler) |
| { |
| boost_asio_handler_invoke_helpers::invoke( |
| function, this_handler->handler_); |
| #if defined(BOOST_ASIO_NO_DEPRECATED) |
| return asio_handler_invoke_is_no_longer_used(); |
| #endif // defined(BOOST_ASIO_NO_DEPRECATED) |
| } |
| |
| template <typename Stream> |
| class initiate_async_buffered_fill |
| { |
| public: |
| typedef typename remove_reference< |
| Stream>::type::lowest_layer_type::executor_type executor_type; |
| |
| explicit initiate_async_buffered_fill( |
| typename remove_reference<Stream>::type& next_layer) |
| : next_layer_(next_layer) |
| { |
| } |
| |
| executor_type get_executor() const BOOST_ASIO_NOEXCEPT |
| { |
| return next_layer_.lowest_layer().get_executor(); |
| } |
| |
| template <typename ReadHandler> |
| void operator()(BOOST_ASIO_MOVE_ARG(ReadHandler) handler, |
| buffered_stream_storage* storage) const |
| { |
| // If you get an error on the following line it means that your handler |
| // does not meet the documented type requirements for a ReadHandler. |
| BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check; |
| |
| non_const_lvalue<ReadHandler> handler2(handler); |
| std::size_t previous_size = storage->size(); |
| storage->resize(storage->capacity()); |
| next_layer_.async_read_some( |
| buffer( |
| storage->data() + previous_size, |
| storage->size() - previous_size), |
| buffered_fill_handler<typename decay<ReadHandler>::type>( |
| *storage, previous_size, handler2.value)); |
| } |
| |
| private: |
| typename remove_reference<Stream>::type& next_layer_; |
| }; |
| } // namespace detail |
| |
| #if !defined(GENERATING_DOCUMENTATION) |
| |
| template <typename ReadHandler, typename Allocator> |
| struct associated_allocator< |
| detail::buffered_fill_handler<ReadHandler>, Allocator> |
| { |
| typedef typename associated_allocator<ReadHandler, Allocator>::type type; |
| |
| static type get(const detail::buffered_fill_handler<ReadHandler>& h, |
| const Allocator& a = Allocator()) BOOST_ASIO_NOEXCEPT |
| { |
| return associated_allocator<ReadHandler, Allocator>::get(h.handler_, a); |
| } |
| }; |
| |
| template <typename ReadHandler, typename Executor> |
| struct associated_executor< |
| detail::buffered_fill_handler<ReadHandler>, Executor> |
| : detail::associated_executor_forwarding_base<ReadHandler, Executor> |
| { |
| typedef typename associated_executor<ReadHandler, Executor>::type type; |
| |
| static type get(const detail::buffered_fill_handler<ReadHandler>& h, |
| const Executor& ex = Executor()) BOOST_ASIO_NOEXCEPT |
| { |
| return associated_executor<ReadHandler, Executor>::get(h.handler_, ex); |
| } |
| }; |
| |
| #endif // !defined(GENERATING_DOCUMENTATION) |
| |
| template <typename Stream> |
| template < |
| BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code, |
| std::size_t)) ReadHandler> |
| BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(ReadHandler, |
| void (boost::system::error_code, std::size_t)) |
| buffered_read_stream<Stream>::async_fill( |
| BOOST_ASIO_MOVE_ARG(ReadHandler) handler) |
| { |
| return async_initiate<ReadHandler, |
| void (boost::system::error_code, std::size_t)>( |
| detail::initiate_async_buffered_fill<Stream>(next_layer_), |
| handler, &storage_); |
| } |
| |
| template <typename Stream> |
| template <typename MutableBufferSequence> |
| std::size_t buffered_read_stream<Stream>::read_some( |
| const MutableBufferSequence& buffers) |
| { |
| using boost::asio::buffer_size; |
| if (buffer_size(buffers) == 0) |
| return 0; |
| |
| if (storage_.empty()) |
| this->fill(); |
| |
| return this->copy(buffers); |
| } |
| |
| template <typename Stream> |
| template <typename MutableBufferSequence> |
| std::size_t buffered_read_stream<Stream>::read_some( |
| const MutableBufferSequence& buffers, boost::system::error_code& ec) |
| { |
| ec = boost::system::error_code(); |
| |
| using boost::asio::buffer_size; |
| if (buffer_size(buffers) == 0) |
| return 0; |
| |
| if (storage_.empty() && !this->fill(ec)) |
| return 0; |
| |
| return this->copy(buffers); |
| } |
| |
| namespace detail |
| { |
| template <typename MutableBufferSequence, typename ReadHandler> |
| class buffered_read_some_handler |
| { |
| public: |
| buffered_read_some_handler(detail::buffered_stream_storage& storage, |
| const MutableBufferSequence& buffers, ReadHandler& handler) |
| : storage_(storage), |
| buffers_(buffers), |
| handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(handler)) |
| { |
| } |
| |
| #if defined(BOOST_ASIO_HAS_MOVE) |
| buffered_read_some_handler(const buffered_read_some_handler& other) |
| : storage_(other.storage_), |
| buffers_(other.buffers_), |
| handler_(other.handler_) |
| { |
| } |
| |
| buffered_read_some_handler(buffered_read_some_handler&& other) |
| : storage_(other.storage_), |
| buffers_(other.buffers_), |
| handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(other.handler_)) |
| { |
| } |
| #endif // defined(BOOST_ASIO_HAS_MOVE) |
| |
| void operator()(const boost::system::error_code& ec, std::size_t) |
| { |
| if (ec || storage_.empty()) |
| { |
| const std::size_t length = 0; |
| handler_(ec, length); |
| } |
| else |
| { |
| const std::size_t bytes_copied = boost::asio::buffer_copy( |
| buffers_, storage_.data(), storage_.size()); |
| storage_.consume(bytes_copied); |
| handler_(ec, bytes_copied); |
| } |
| } |
| |
| //private: |
| detail::buffered_stream_storage& storage_; |
| MutableBufferSequence buffers_; |
| ReadHandler handler_; |
| }; |
| |
| template <typename MutableBufferSequence, typename ReadHandler> |
| inline asio_handler_allocate_is_deprecated |
| asio_handler_allocate(std::size_t size, |
| buffered_read_some_handler< |
| MutableBufferSequence, ReadHandler>* this_handler) |
| { |
| #if defined(BOOST_ASIO_NO_DEPRECATED) |
| boost_asio_handler_alloc_helpers::allocate(size, this_handler->handler_); |
| return asio_handler_allocate_is_no_longer_used(); |
| #else // defined(BOOST_ASIO_NO_DEPRECATED) |
| return boost_asio_handler_alloc_helpers::allocate( |
| size, this_handler->handler_); |
| #endif // defined(BOOST_ASIO_NO_DEPRECATED) |
| } |
| |
| template <typename MutableBufferSequence, typename ReadHandler> |
| inline asio_handler_deallocate_is_deprecated |
| asio_handler_deallocate(void* pointer, std::size_t size, |
| buffered_read_some_handler< |
| MutableBufferSequence, ReadHandler>* this_handler) |
| { |
| boost_asio_handler_alloc_helpers::deallocate( |
| pointer, size, this_handler->handler_); |
| #if defined(BOOST_ASIO_NO_DEPRECATED) |
| return asio_handler_deallocate_is_no_longer_used(); |
| #endif // defined(BOOST_ASIO_NO_DEPRECATED) |
| } |
| |
| template <typename MutableBufferSequence, typename ReadHandler> |
| inline bool asio_handler_is_continuation( |
| buffered_read_some_handler< |
| MutableBufferSequence, ReadHandler>* this_handler) |
| { |
| return boost_asio_handler_cont_helpers::is_continuation( |
| this_handler->handler_); |
| } |
| |
| template <typename Function, typename MutableBufferSequence, |
| typename ReadHandler> |
| inline asio_handler_invoke_is_deprecated |
| asio_handler_invoke(Function& function, |
| buffered_read_some_handler< |
| MutableBufferSequence, ReadHandler>* this_handler) |
| { |
| boost_asio_handler_invoke_helpers::invoke( |
| function, this_handler->handler_); |
| #if defined(BOOST_ASIO_NO_DEPRECATED) |
| return asio_handler_invoke_is_no_longer_used(); |
| #endif // defined(BOOST_ASIO_NO_DEPRECATED) |
| } |
| |
| template <typename Function, typename MutableBufferSequence, |
| typename ReadHandler> |
| inline asio_handler_invoke_is_deprecated |
| asio_handler_invoke(const Function& function, |
| buffered_read_some_handler< |
| MutableBufferSequence, ReadHandler>* this_handler) |
| { |
| boost_asio_handler_invoke_helpers::invoke( |
| function, this_handler->handler_); |
| #if defined(BOOST_ASIO_NO_DEPRECATED) |
| return asio_handler_invoke_is_no_longer_used(); |
| #endif // defined(BOOST_ASIO_NO_DEPRECATED) |
| } |
| |
| template <typename Stream> |
| class initiate_async_buffered_read_some |
| { |
| public: |
| typedef typename remove_reference< |
| Stream>::type::lowest_layer_type::executor_type executor_type; |
| |
| explicit initiate_async_buffered_read_some( |
| typename remove_reference<Stream>::type& next_layer) |
| : next_layer_(next_layer) |
| { |
| } |
| |
| executor_type get_executor() const BOOST_ASIO_NOEXCEPT |
| { |
| return next_layer_.lowest_layer().get_executor(); |
| } |
| |
| template <typename ReadHandler, typename MutableBufferSequence> |
| void operator()(BOOST_ASIO_MOVE_ARG(ReadHandler) handler, |
| buffered_stream_storage* storage, |
| const MutableBufferSequence& buffers) const |
| { |
| // If you get an error on the following line it means that your handler |
| // does not meet the documented type requirements for a ReadHandler. |
| BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check; |
| |
| using boost::asio::buffer_size; |
| non_const_lvalue<ReadHandler> handler2(handler); |
| if (buffer_size(buffers) == 0 || !storage->empty()) |
| { |
| next_layer_.async_read_some(BOOST_ASIO_MUTABLE_BUFFER(0, 0), |
| buffered_read_some_handler<MutableBufferSequence, |
| typename decay<ReadHandler>::type>( |
| *storage, buffers, handler2.value)); |
| } |
| else |
| { |
| initiate_async_buffered_fill<Stream>(this->next_layer_)( |
| buffered_read_some_handler<MutableBufferSequence, |
| typename decay<ReadHandler>::type>( |
| *storage, buffers, handler2.value), |
| storage); |
| } |
| } |
| |
| private: |
| typename remove_reference<Stream>::type& next_layer_; |
| }; |
| } // namespace detail |
| |
| #if !defined(GENERATING_DOCUMENTATION) |
| |
| template <typename MutableBufferSequence, |
| typename ReadHandler, typename Allocator> |
| struct associated_allocator< |
| detail::buffered_read_some_handler<MutableBufferSequence, ReadHandler>, |
| Allocator> |
| { |
| typedef typename associated_allocator<ReadHandler, Allocator>::type type; |
| |
| static type get( |
| const detail::buffered_read_some_handler< |
| MutableBufferSequence, ReadHandler>& h, |
| const Allocator& a = Allocator()) BOOST_ASIO_NOEXCEPT |
| { |
| return associated_allocator<ReadHandler, Allocator>::get(h.handler_, a); |
| } |
| }; |
| |
| template <typename MutableBufferSequence, |
| typename ReadHandler, typename Executor> |
| struct associated_executor< |
| detail::buffered_read_some_handler<MutableBufferSequence, ReadHandler>, |
| Executor> |
| : detail::associated_executor_forwarding_base<ReadHandler, Executor> |
| { |
| typedef typename associated_executor<ReadHandler, Executor>::type type; |
| |
| static type get( |
| const detail::buffered_read_some_handler< |
| MutableBufferSequence, ReadHandler>& h, |
| const Executor& ex = Executor()) BOOST_ASIO_NOEXCEPT |
| { |
| return associated_executor<ReadHandler, Executor>::get(h.handler_, ex); |
| } |
| }; |
| |
| #endif // !defined(GENERATING_DOCUMENTATION) |
| |
| template <typename Stream> |
| template <typename MutableBufferSequence, |
| BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code, |
| std::size_t)) ReadHandler> |
| BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(ReadHandler, |
| void (boost::system::error_code, std::size_t)) |
| buffered_read_stream<Stream>::async_read_some( |
| const MutableBufferSequence& buffers, |
| BOOST_ASIO_MOVE_ARG(ReadHandler) handler) |
| { |
| return async_initiate<ReadHandler, |
| void (boost::system::error_code, std::size_t)>( |
| detail::initiate_async_buffered_read_some<Stream>(next_layer_), |
| handler, &storage_, buffers); |
| } |
| |
| template <typename Stream> |
| template <typename MutableBufferSequence> |
| std::size_t buffered_read_stream<Stream>::peek( |
| const MutableBufferSequence& buffers) |
| { |
| if (storage_.empty()) |
| this->fill(); |
| return this->peek_copy(buffers); |
| } |
| |
| template <typename Stream> |
| template <typename MutableBufferSequence> |
| std::size_t buffered_read_stream<Stream>::peek( |
| const MutableBufferSequence& buffers, boost::system::error_code& ec) |
| { |
| ec = boost::system::error_code(); |
| if (storage_.empty() && !this->fill(ec)) |
| return 0; |
| return this->peek_copy(buffers); |
| } |
| |
| } // namespace asio |
| } // namespace boost |
| |
| #include <boost/asio/detail/pop_options.hpp> |
| |
| #endif // BOOST_ASIO_IMPL_BUFFERED_READ_STREAM_HPP |