| // |
| // impl/buffered_read_stream.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2015 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 ASIO_IMPL_BUFFERED_READ_STREAM_HPP |
| #define ASIO_IMPL_BUFFERED_READ_STREAM_HPP |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
| # pragma once |
| #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
| |
| #include "asio/associated_allocator.hpp" |
| #include "asio/associated_executor.hpp" |
| #include "asio/detail/handler_alloc_helpers.hpp" |
| #include "asio/detail/handler_cont_helpers.hpp" |
| #include "asio/detail/handler_invoke_helpers.hpp" |
| #include "asio/detail/handler_type_requirements.hpp" |
| |
| #include "asio/detail/push_options.hpp" |
| |
| 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(asio::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_(ASIO_MOVE_CAST(ReadHandler)(handler)) |
| { |
| } |
| |
| #if defined(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_(ASIO_MOVE_CAST(ReadHandler)(other.handler_)) |
| { |
| } |
| #endif // defined(ASIO_HAS_MOVE) |
| |
| void operator()(const asio::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 void* asio_handler_allocate(std::size_t size, |
| buffered_fill_handler<ReadHandler>* this_handler) |
| { |
| return asio_handler_alloc_helpers::allocate( |
| size, this_handler->handler_); |
| } |
| |
| template <typename ReadHandler> |
| inline void asio_handler_deallocate(void* pointer, std::size_t size, |
| buffered_fill_handler<ReadHandler>* this_handler) |
| { |
| asio_handler_alloc_helpers::deallocate( |
| pointer, size, this_handler->handler_); |
| } |
| |
| template <typename ReadHandler> |
| inline bool asio_handler_is_continuation( |
| buffered_fill_handler<ReadHandler>* this_handler) |
| { |
| return asio_handler_cont_helpers::is_continuation( |
| this_handler->handler_); |
| } |
| |
| template <typename Function, typename ReadHandler> |
| inline void asio_handler_invoke(Function& function, |
| buffered_fill_handler<ReadHandler>* this_handler) |
| { |
| asio_handler_invoke_helpers::invoke( |
| function, this_handler->handler_); |
| } |
| |
| template <typename Function, typename ReadHandler> |
| inline void asio_handler_invoke(const Function& function, |
| buffered_fill_handler<ReadHandler>* this_handler) |
| { |
| asio_handler_invoke_helpers::invoke( |
| function, this_handler->handler_); |
| } |
| } // 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()) 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> |
| { |
| typedef typename associated_executor<ReadHandler, Executor>::type type; |
| |
| static type get(const detail::buffered_fill_handler<ReadHandler>& h, |
| const Executor& ex = Executor()) ASIO_NOEXCEPT |
| { |
| return associated_executor<ReadHandler, Executor>::get(h.handler_, ex); |
| } |
| }; |
| |
| #endif // !defined(GENERATING_DOCUMENTATION) |
| |
| template <typename Stream> |
| template <typename ReadHandler> |
| ASIO_INITFN_RESULT_TYPE(ReadHandler, |
| void (asio::error_code, std::size_t)) |
| buffered_read_stream<Stream>::async_fill( |
| ASIO_MOVE_ARG(ReadHandler) handler) |
| { |
| // If you get an error on the following line it means that your handler does |
| // not meet the documented type requirements for a ReadHandler. |
| ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check; |
| |
| async_completion<ReadHandler, |
| void (asio::error_code, std::size_t)> init(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), |
| detail::buffered_fill_handler<ASIO_HANDLER_TYPE( |
| ReadHandler, void (asio::error_code, std::size_t))>( |
| storage_, previous_size, init.completion_handler)); |
| |
| return init.result.get(); |
| } |
| |
| template <typename Stream> |
| template <typename MutableBufferSequence> |
| std::size_t buffered_read_stream<Stream>::read_some( |
| const MutableBufferSequence& buffers) |
| { |
| if (asio::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, asio::error_code& ec) |
| { |
| ec = asio::error_code(); |
| |
| if (asio::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_(ASIO_MOVE_CAST(ReadHandler)(handler)) |
| { |
| } |
| |
| #if defined(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_(ASIO_MOVE_CAST(ReadHandler)(other.handler_)) |
| { |
| } |
| #endif // defined(ASIO_HAS_MOVE) |
| |
| void operator()(const asio::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 = 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 void* asio_handler_allocate(std::size_t size, |
| buffered_read_some_handler< |
| MutableBufferSequence, ReadHandler>* this_handler) |
| { |
| return asio_handler_alloc_helpers::allocate( |
| size, this_handler->handler_); |
| } |
| |
| template <typename MutableBufferSequence, typename ReadHandler> |
| inline void asio_handler_deallocate(void* pointer, std::size_t size, |
| buffered_read_some_handler< |
| MutableBufferSequence, ReadHandler>* this_handler) |
| { |
| asio_handler_alloc_helpers::deallocate( |
| pointer, size, this_handler->handler_); |
| } |
| |
| template <typename MutableBufferSequence, typename ReadHandler> |
| inline bool asio_handler_is_continuation( |
| buffered_read_some_handler< |
| MutableBufferSequence, ReadHandler>* this_handler) |
| { |
| return asio_handler_cont_helpers::is_continuation( |
| this_handler->handler_); |
| } |
| |
| template <typename Function, typename MutableBufferSequence, |
| typename ReadHandler> |
| inline void asio_handler_invoke(Function& function, |
| buffered_read_some_handler< |
| MutableBufferSequence, ReadHandler>* this_handler) |
| { |
| asio_handler_invoke_helpers::invoke( |
| function, this_handler->handler_); |
| } |
| |
| template <typename Function, typename MutableBufferSequence, |
| typename ReadHandler> |
| inline void asio_handler_invoke(const Function& function, |
| buffered_read_some_handler< |
| MutableBufferSequence, ReadHandler>* this_handler) |
| { |
| asio_handler_invoke_helpers::invoke( |
| function, this_handler->handler_); |
| } |
| } // 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()) 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> |
| { |
| typedef typename associated_executor<ReadHandler, Executor>::type type; |
| |
| static type get( |
| const detail::buffered_read_some_handler< |
| MutableBufferSequence, ReadHandler>& h, |
| const Executor& ex = Executor()) ASIO_NOEXCEPT |
| { |
| return associated_executor<ReadHandler, Executor>::get(h.handler_, ex); |
| } |
| }; |
| |
| #endif // !defined(GENERATING_DOCUMENTATION) |
| |
| template <typename Stream> |
| template <typename MutableBufferSequence, typename ReadHandler> |
| ASIO_INITFN_RESULT_TYPE(ReadHandler, |
| void (asio::error_code, std::size_t)) |
| buffered_read_stream<Stream>::async_read_some( |
| const MutableBufferSequence& buffers, |
| ASIO_MOVE_ARG(ReadHandler) handler) |
| { |
| // If you get an error on the following line it means that your handler does |
| // not meet the documented type requirements for a ReadHandler. |
| ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check; |
| |
| async_completion<ReadHandler, |
| void (asio::error_code, std::size_t)> init(handler); |
| |
| if (asio::buffer_size(buffers) == 0 || !storage_.empty()) |
| { |
| next_layer_.async_read_some(asio::mutable_buffers_1(0, 0), |
| detail::buffered_read_some_handler< |
| MutableBufferSequence, ASIO_HANDLER_TYPE( |
| ReadHandler, void (asio::error_code, std::size_t))>( |
| storage_, buffers, init.completion_handler)); |
| } |
| else |
| { |
| this->async_fill(detail::buffered_read_some_handler< |
| MutableBufferSequence, ASIO_HANDLER_TYPE( |
| ReadHandler, void (asio::error_code, std::size_t))>( |
| storage_, buffers, init.completion_handler)); |
| } |
| |
| return init.result.get(); |
| } |
| |
| 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, asio::error_code& ec) |
| { |
| ec = asio::error_code(); |
| if (storage_.empty() && !this->fill(ec)) |
| return 0; |
| return this->peek_copy(buffers); |
| } |
| |
| } // namespace asio |
| |
| #include "asio/detail/pop_options.hpp" |
| |
| #endif // ASIO_IMPL_BUFFERED_READ_STREAM_HPP |