Chris@16: //
Chris@16: // impl/buffered_read_stream.hpp
Chris@16: // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Chris@16: //
Chris@101: // Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com)
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: 
Chris@16: #ifndef BOOST_ASIO_IMPL_BUFFERED_READ_STREAM_HPP
Chris@16: #define BOOST_ASIO_IMPL_BUFFERED_READ_STREAM_HPP
Chris@16: 
Chris@16: #if defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16: # pragma once
Chris@16: #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16: 
Chris@16: #include <boost/asio/detail/handler_alloc_helpers.hpp>
Chris@16: #include <boost/asio/detail/handler_cont_helpers.hpp>
Chris@16: #include <boost/asio/detail/handler_invoke_helpers.hpp>
Chris@16: #include <boost/asio/detail/handler_type_requirements.hpp>
Chris@16: 
Chris@16: #include <boost/asio/detail/push_options.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace asio {
Chris@16: 
Chris@16: template <typename Stream>
Chris@16: std::size_t buffered_read_stream<Stream>::fill()
Chris@16: {
Chris@16:   detail::buffer_resize_guard<detail::buffered_stream_storage>
Chris@16:     resize_guard(storage_);
Chris@16:   std::size_t previous_size = storage_.size();
Chris@16:   storage_.resize(storage_.capacity());
Chris@16:   storage_.resize(previous_size + next_layer_.read_some(buffer(
Chris@16:           storage_.data() + previous_size,
Chris@16:           storage_.size() - previous_size)));
Chris@16:   resize_guard.commit();
Chris@16:   return storage_.size() - previous_size;
Chris@16: }
Chris@16: 
Chris@16: template <typename Stream>
Chris@16: std::size_t buffered_read_stream<Stream>::fill(boost::system::error_code& ec)
Chris@16: {
Chris@16:   detail::buffer_resize_guard<detail::buffered_stream_storage>
Chris@16:     resize_guard(storage_);
Chris@16:   std::size_t previous_size = storage_.size();
Chris@16:   storage_.resize(storage_.capacity());
Chris@16:   storage_.resize(previous_size + next_layer_.read_some(buffer(
Chris@16:           storage_.data() + previous_size,
Chris@16:           storage_.size() - previous_size),
Chris@16:         ec));
Chris@16:   resize_guard.commit();
Chris@16:   return storage_.size() - previous_size;
Chris@16: }
Chris@16: 
Chris@16: namespace detail
Chris@16: {
Chris@16:   template <typename ReadHandler>
Chris@16:   class buffered_fill_handler
Chris@16:   {
Chris@16:   public:
Chris@16:     buffered_fill_handler(detail::buffered_stream_storage& storage,
Chris@16:         std::size_t previous_size, ReadHandler& handler)
Chris@16:       : storage_(storage),
Chris@16:         previous_size_(previous_size),
Chris@16:         handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(handler))
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16: #if defined(BOOST_ASIO_HAS_MOVE)
Chris@16:     buffered_fill_handler(const buffered_fill_handler& other)
Chris@16:       : storage_(other.storage_),
Chris@16:         previous_size_(other.previous_size_),
Chris@16:         handler_(other.handler_)
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16:     buffered_fill_handler(buffered_fill_handler&& other)
Chris@16:       : storage_(other.storage_),
Chris@16:         previous_size_(other.previous_size_),
Chris@16:         handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(other.handler_))
Chris@16:     {
Chris@16:     }
Chris@16: #endif // defined(BOOST_ASIO_HAS_MOVE)
Chris@16: 
Chris@16:     void operator()(const boost::system::error_code& ec,
Chris@16:         const std::size_t bytes_transferred)
Chris@16:     {
Chris@16:       storage_.resize(previous_size_ + bytes_transferred);
Chris@16:       handler_(ec, bytes_transferred);
Chris@16:     }
Chris@16: 
Chris@16:   //private:
Chris@16:     detail::buffered_stream_storage& storage_;
Chris@16:     std::size_t previous_size_;
Chris@16:     ReadHandler handler_;
Chris@16:   };
Chris@16: 
Chris@16:   template <typename ReadHandler>
Chris@16:   inline void* asio_handler_allocate(std::size_t size,
Chris@16:       buffered_fill_handler<ReadHandler>* this_handler)
Chris@16:   {
Chris@16:     return boost_asio_handler_alloc_helpers::allocate(
Chris@16:         size, this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename ReadHandler>
Chris@16:   inline void asio_handler_deallocate(void* pointer, std::size_t size,
Chris@16:       buffered_fill_handler<ReadHandler>* this_handler)
Chris@16:   {
Chris@16:     boost_asio_handler_alloc_helpers::deallocate(
Chris@16:         pointer, size, this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename ReadHandler>
Chris@16:   inline bool asio_handler_is_continuation(
Chris@16:       buffered_fill_handler<ReadHandler>* this_handler)
Chris@16:   {
Chris@16:     return boost_asio_handler_cont_helpers::is_continuation(
Chris@16:           this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename Function, typename ReadHandler>
Chris@16:   inline void asio_handler_invoke(Function& function,
Chris@16:       buffered_fill_handler<ReadHandler>* this_handler)
Chris@16:   {
Chris@16:     boost_asio_handler_invoke_helpers::invoke(
Chris@16:         function, this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename Function, typename ReadHandler>
Chris@16:   inline void asio_handler_invoke(const Function& function,
Chris@16:       buffered_fill_handler<ReadHandler>* this_handler)
Chris@16:   {
Chris@16:     boost_asio_handler_invoke_helpers::invoke(
Chris@16:         function, this_handler->handler_);
Chris@16:   }
Chris@16: } // namespace detail
Chris@16: 
Chris@16: template <typename Stream>
Chris@16: template <typename ReadHandler>
Chris@16: BOOST_ASIO_INITFN_RESULT_TYPE(ReadHandler,
Chris@16:     void (boost::system::error_code, std::size_t))
Chris@16: buffered_read_stream<Stream>::async_fill(
Chris@16:     BOOST_ASIO_MOVE_ARG(ReadHandler) handler)
Chris@16: {
Chris@16:   // If you get an error on the following line it means that your handler does
Chris@16:   // not meet the documented type requirements for a ReadHandler.
Chris@16:   BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
Chris@16: 
Chris@16:   detail::async_result_init<
Chris@16:     ReadHandler, void (boost::system::error_code, std::size_t)> init(
Chris@16:       BOOST_ASIO_MOVE_CAST(ReadHandler)(handler));
Chris@16: 
Chris@16:   std::size_t previous_size = storage_.size();
Chris@16:   storage_.resize(storage_.capacity());
Chris@16:   next_layer_.async_read_some(
Chris@16:       buffer(
Chris@16:         storage_.data() + previous_size,
Chris@16:         storage_.size() - previous_size),
Chris@16:       detail::buffered_fill_handler<BOOST_ASIO_HANDLER_TYPE(
Chris@16:         ReadHandler, void (boost::system::error_code, std::size_t))>(
Chris@16:         storage_, previous_size, init.handler));
Chris@16: 
Chris@16:   return init.result.get();
Chris@16: }
Chris@16: 
Chris@16: template <typename Stream>
Chris@16: template <typename MutableBufferSequence>
Chris@16: std::size_t buffered_read_stream<Stream>::read_some(
Chris@16:     const MutableBufferSequence& buffers)
Chris@16: {
Chris@16:   if (boost::asio::buffer_size(buffers) == 0)
Chris@16:     return 0;
Chris@16: 
Chris@16:   if (storage_.empty())
Chris@16:     this->fill();
Chris@16: 
Chris@16:   return this->copy(buffers);
Chris@16: }
Chris@16: 
Chris@16: template <typename Stream>
Chris@16: template <typename MutableBufferSequence>
Chris@16: std::size_t buffered_read_stream<Stream>::read_some(
Chris@16:     const MutableBufferSequence& buffers, boost::system::error_code& ec)
Chris@16: {
Chris@16:   ec = boost::system::error_code();
Chris@16: 
Chris@16:   if (boost::asio::buffer_size(buffers) == 0)
Chris@16:     return 0;
Chris@16: 
Chris@16:   if (storage_.empty() && !this->fill(ec))
Chris@16:     return 0;
Chris@16: 
Chris@16:   return this->copy(buffers);
Chris@16: }
Chris@16: 
Chris@16: namespace detail
Chris@16: {
Chris@16:   template <typename MutableBufferSequence, typename ReadHandler>
Chris@16:   class buffered_read_some_handler
Chris@16:   {
Chris@16:   public:
Chris@16:     buffered_read_some_handler(detail::buffered_stream_storage& storage,
Chris@16:         const MutableBufferSequence& buffers, ReadHandler& handler)
Chris@16:       : storage_(storage),
Chris@16:         buffers_(buffers),
Chris@16:         handler_(handler)
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16: #if defined(BOOST_ASIO_HAS_MOVE)
Chris@16:       buffered_read_some_handler(const buffered_read_some_handler& other)
Chris@16:         : storage_(other.storage_),
Chris@16:           buffers_(other.buffers_),
Chris@16:           handler_(other.handler_)
Chris@16:       {
Chris@16:       }
Chris@16: 
Chris@16:       buffered_read_some_handler(buffered_read_some_handler&& other)
Chris@16:         : storage_(other.storage_),
Chris@16:           buffers_(other.buffers_),
Chris@16:           handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(other.handler_))
Chris@16:       {
Chris@16:       }
Chris@16: #endif // defined(BOOST_ASIO_HAS_MOVE)
Chris@16: 
Chris@16:     void operator()(const boost::system::error_code& ec, std::size_t)
Chris@16:     {
Chris@16:       if (ec || storage_.empty())
Chris@16:       {
Chris@16:         const std::size_t length = 0;
Chris@16:         handler_(ec, length);
Chris@16:       }
Chris@16:       else
Chris@16:       {
Chris@16:         const std::size_t bytes_copied = boost::asio::buffer_copy(
Chris@16:             buffers_, storage_.data(), storage_.size());
Chris@16:         storage_.consume(bytes_copied);
Chris@16:         handler_(ec, bytes_copied);
Chris@16:       }
Chris@16:     }
Chris@16: 
Chris@16:   //private:
Chris@16:     detail::buffered_stream_storage& storage_;
Chris@16:     MutableBufferSequence buffers_;
Chris@16:     ReadHandler handler_;
Chris@16:   };
Chris@16: 
Chris@16:   template <typename MutableBufferSequence, typename ReadHandler>
Chris@16:   inline void* asio_handler_allocate(std::size_t size,
Chris@16:       buffered_read_some_handler<
Chris@16:         MutableBufferSequence, ReadHandler>* this_handler)
Chris@16:   {
Chris@16:     return boost_asio_handler_alloc_helpers::allocate(
Chris@16:         size, this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename MutableBufferSequence, typename ReadHandler>
Chris@16:   inline void asio_handler_deallocate(void* pointer, std::size_t size,
Chris@16:       buffered_read_some_handler<
Chris@16:         MutableBufferSequence, ReadHandler>* this_handler)
Chris@16:   {
Chris@16:     boost_asio_handler_alloc_helpers::deallocate(
Chris@16:         pointer, size, this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename MutableBufferSequence, typename ReadHandler>
Chris@16:   inline bool asio_handler_is_continuation(
Chris@16:       buffered_read_some_handler<
Chris@16:         MutableBufferSequence, ReadHandler>* this_handler)
Chris@16:   {
Chris@16:     return boost_asio_handler_cont_helpers::is_continuation(
Chris@16:           this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename Function, typename MutableBufferSequence,
Chris@16:       typename ReadHandler>
Chris@16:   inline void asio_handler_invoke(Function& function,
Chris@16:       buffered_read_some_handler<
Chris@16:         MutableBufferSequence, ReadHandler>* this_handler)
Chris@16:   {
Chris@16:     boost_asio_handler_invoke_helpers::invoke(
Chris@16:         function, this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename Function, typename MutableBufferSequence,
Chris@16:       typename ReadHandler>
Chris@16:   inline void asio_handler_invoke(const Function& function,
Chris@16:       buffered_read_some_handler<
Chris@16:         MutableBufferSequence, ReadHandler>* this_handler)
Chris@16:   {
Chris@16:     boost_asio_handler_invoke_helpers::invoke(
Chris@16:         function, this_handler->handler_);
Chris@16:   }
Chris@16: } // namespace detail
Chris@16: 
Chris@16: template <typename Stream>
Chris@16: template <typename MutableBufferSequence, typename ReadHandler>
Chris@16: BOOST_ASIO_INITFN_RESULT_TYPE(ReadHandler,
Chris@16:     void (boost::system::error_code, std::size_t))
Chris@16: buffered_read_stream<Stream>::async_read_some(
Chris@16:     const MutableBufferSequence& buffers,
Chris@16:     BOOST_ASIO_MOVE_ARG(ReadHandler) handler)
Chris@16: {
Chris@16:   // If you get an error on the following line it means that your handler does
Chris@16:   // not meet the documented type requirements for a ReadHandler.
Chris@16:   BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
Chris@16: 
Chris@16:   detail::async_result_init<
Chris@16:     ReadHandler, void (boost::system::error_code, std::size_t)> init(
Chris@16:       BOOST_ASIO_MOVE_CAST(ReadHandler)(handler));
Chris@16: 
Chris@16:   if (boost::asio::buffer_size(buffers) == 0 || !storage_.empty())
Chris@16:   {
Chris@16:     next_layer_.async_read_some(boost::asio::mutable_buffers_1(0, 0),
Chris@16:         detail::buffered_read_some_handler<
Chris@16:           MutableBufferSequence, BOOST_ASIO_HANDLER_TYPE(
Chris@16:             ReadHandler, void (boost::system::error_code, std::size_t))>(
Chris@16:             storage_, buffers, init.handler));
Chris@16:   }
Chris@16:   else
Chris@16:   {
Chris@16:     this->async_fill(detail::buffered_read_some_handler<
Chris@16:           MutableBufferSequence, BOOST_ASIO_HANDLER_TYPE(
Chris@16:             ReadHandler, void (boost::system::error_code, std::size_t))>(
Chris@16:             storage_, buffers, init.handler));
Chris@16:   }
Chris@16: 
Chris@16:   return init.result.get();
Chris@16: }
Chris@16: 
Chris@16: template <typename Stream>
Chris@16: template <typename MutableBufferSequence>
Chris@16: std::size_t buffered_read_stream<Stream>::peek(
Chris@16:     const MutableBufferSequence& buffers)
Chris@16: {
Chris@16:   if (storage_.empty())
Chris@16:     this->fill();
Chris@16:   return this->peek_copy(buffers);
Chris@16: }
Chris@16: 
Chris@16: template <typename Stream>
Chris@16: template <typename MutableBufferSequence>
Chris@16: std::size_t buffered_read_stream<Stream>::peek(
Chris@16:     const MutableBufferSequence& buffers, boost::system::error_code& ec)
Chris@16: {
Chris@16:   ec = boost::system::error_code();
Chris@16:   if (storage_.empty() && !this->fill(ec))
Chris@16:     return 0;
Chris@16:   return this->peek_copy(buffers);
Chris@16: }
Chris@16: 
Chris@16: } // namespace asio
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #include <boost/asio/detail/pop_options.hpp>
Chris@16: 
Chris@16: #endif // BOOST_ASIO_IMPL_BUFFERED_READ_STREAM_HPP