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-rw-r--r--lib/asio/ssl/detail/io.hpp372
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diff --git a/lib/asio/ssl/detail/io.hpp b/lib/asio/ssl/detail/io.hpp
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-//
-// ssl/detail/io.hpp
-// ~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 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_SSL_DETAIL_IO_HPP
-#define ASIO_SSL_DETAIL_IO_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-
-#include "asio/ssl/detail/engine.hpp"
-#include "asio/ssl/detail/stream_core.hpp"
-#include "asio/write.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace ssl {
-namespace detail {
-
-template <typename Stream, typename Operation>
-std::size_t io(Stream& next_layer, stream_core& core,
- const Operation& op, asio::error_code& ec)
-{
- std::size_t bytes_transferred = 0;
- do switch (op(core.engine_, ec, bytes_transferred))
- {
- case engine::want_input_and_retry:
-
- // If the input buffer is empty then we need to read some more data from
- // the underlying transport.
- if (core.input_.size() == 0)
- core.input_ = asio::buffer(core.input_buffer_,
- next_layer.read_some(core.input_buffer_, ec));
-
- // Pass the new input data to the engine.
- core.input_ = core.engine_.put_input(core.input_);
-
- // Try the operation again.
- continue;
-
- case engine::want_output_and_retry:
-
- // Get output data from the engine and write it to the underlying
- // transport.
- asio::write(next_layer,
- core.engine_.get_output(core.output_buffer_), ec);
-
- // Try the operation again.
- continue;
-
- case engine::want_output:
-
- // Get output data from the engine and write it to the underlying
- // transport.
- asio::write(next_layer,
- core.engine_.get_output(core.output_buffer_), ec);
-
- // Operation is complete. Return result to caller.
- core.engine_.map_error_code(ec);
- return bytes_transferred;
-
- default:
-
- // Operation is complete. Return result to caller.
- core.engine_.map_error_code(ec);
- return bytes_transferred;
-
- } while (!ec);
-
- // Operation failed. Return result to caller.
- core.engine_.map_error_code(ec);
- return 0;
-}
-
-template <typename Stream, typename Operation, typename Handler>
-class io_op
-{
-public:
- io_op(Stream& next_layer, stream_core& core,
- const Operation& op, Handler& handler)
- : next_layer_(next_layer),
- core_(core),
- op_(op),
- start_(0),
- want_(engine::want_nothing),
- bytes_transferred_(0),
- handler_(ASIO_MOVE_CAST(Handler)(handler))
- {
- }
-
-#if defined(ASIO_HAS_MOVE)
- io_op(const io_op& other)
- : next_layer_(other.next_layer_),
- core_(other.core_),
- op_(other.op_),
- start_(other.start_),
- want_(other.want_),
- ec_(other.ec_),
- bytes_transferred_(other.bytes_transferred_),
- handler_(other.handler_)
- {
- }
-
- io_op(io_op&& other)
- : next_layer_(other.next_layer_),
- core_(other.core_),
- op_(ASIO_MOVE_CAST(Operation)(other.op_)),
- start_(other.start_),
- want_(other.want_),
- ec_(other.ec_),
- bytes_transferred_(other.bytes_transferred_),
- handler_(ASIO_MOVE_CAST(Handler)(other.handler_))
- {
- }
-#endif // defined(ASIO_HAS_MOVE)
-
- void operator()(asio::error_code ec,
- std::size_t bytes_transferred = ~std::size_t(0), int start = 0)
- {
- switch (start_ = start)
- {
- case 1: // Called after at least one async operation.
- do
- {
- switch (want_ = op_(core_.engine_, ec_, bytes_transferred_))
- {
- case engine::want_input_and_retry:
-
- // If the input buffer already has data in it we can pass it to the
- // engine and then retry the operation immediately.
- if (core_.input_.size() != 0)
- {
- core_.input_ = core_.engine_.put_input(core_.input_);
- continue;
- }
-
- // The engine wants more data to be read from input. However, we
- // cannot allow more than one read operation at a time on the
- // underlying transport. The pending_read_ timer's expiry is set to
- // pos_infin if a read is in progress, and neg_infin otherwise.
- if (core_.expiry(core_.pending_read_) == core_.neg_infin())
- {
- // Prevent other read operations from being started.
- core_.pending_read_.expires_at(core_.pos_infin());
-
- // Start reading some data from the underlying transport.
- next_layer_.async_read_some(
- asio::buffer(core_.input_buffer_),
- ASIO_MOVE_CAST(io_op)(*this));
- }
- else
- {
- // Wait until the current read operation completes.
- core_.pending_read_.async_wait(ASIO_MOVE_CAST(io_op)(*this));
- }
-
- // Yield control until asynchronous operation completes. Control
- // resumes at the "default:" label below.
- return;
-
- case engine::want_output_and_retry:
- case engine::want_output:
-
- // The engine wants some data to be written to the output. However, we
- // cannot allow more than one write operation at a time on the
- // underlying transport. The pending_write_ timer's expiry is set to
- // pos_infin if a write is in progress, and neg_infin otherwise.
- if (core_.expiry(core_.pending_write_) == core_.neg_infin())
- {
- // Prevent other write operations from being started.
- core_.pending_write_.expires_at(core_.pos_infin());
-
- // Start writing all the data to the underlying transport.
- asio::async_write(next_layer_,
- core_.engine_.get_output(core_.output_buffer_),
- ASIO_MOVE_CAST(io_op)(*this));
- }
- else
- {
- // Wait until the current write operation completes.
- core_.pending_write_.async_wait(ASIO_MOVE_CAST(io_op)(*this));
- }
-
- // Yield control until asynchronous operation completes. Control
- // resumes at the "default:" label below.
- return;
-
- default:
-
- // The SSL operation is done and we can invoke the handler, but we
- // have to keep in mind that this function might be being called from
- // the async operation's initiating function. In this case we're not
- // allowed to call the handler directly. Instead, issue a zero-sized
- // read so the handler runs "as-if" posted using io_context::post().
- if (start)
- {
- next_layer_.async_read_some(
- asio::buffer(core_.input_buffer_, 0),
- ASIO_MOVE_CAST(io_op)(*this));
-
- // Yield control until asynchronous operation completes. Control
- // resumes at the "default:" label below.
- return;
- }
- else
- {
- // Continue on to run handler directly.
- break;
- }
- }
-
- default:
- if (bytes_transferred == ~std::size_t(0))
- bytes_transferred = 0; // Timer cancellation, no data transferred.
- else if (!ec_)
- ec_ = ec;
-
- switch (want_)
- {
- case engine::want_input_and_retry:
-
- // Add received data to the engine's input.
- core_.input_ = asio::buffer(
- core_.input_buffer_, bytes_transferred);
- core_.input_ = core_.engine_.put_input(core_.input_);
-
- // Release any waiting read operations.
- core_.pending_read_.expires_at(core_.neg_infin());
-
- // Try the operation again.
- continue;
-
- case engine::want_output_and_retry:
-
- // Release any waiting write operations.
- core_.pending_write_.expires_at(core_.neg_infin());
-
- // Try the operation again.
- continue;
-
- case engine::want_output:
-
- // Release any waiting write operations.
- core_.pending_write_.expires_at(core_.neg_infin());
-
- // Fall through to call handler.
-
- default:
-
- // Pass the result to the handler.
- op_.call_handler(handler_,
- core_.engine_.map_error_code(ec_),
- ec_ ? 0 : bytes_transferred_);
-
- // Our work here is done.
- return;
- }
- } while (!ec_);
-
- // Operation failed. Pass the result to the handler.
- op_.call_handler(handler_, core_.engine_.map_error_code(ec_), 0);
- }
- }
-
-//private:
- Stream& next_layer_;
- stream_core& core_;
- Operation op_;
- int start_;
- engine::want want_;
- asio::error_code ec_;
- std::size_t bytes_transferred_;
- Handler handler_;
-};
-
-template <typename Stream, typename Operation, typename Handler>
-inline void* asio_handler_allocate(std::size_t size,
- io_op<Stream, Operation, Handler>* this_handler)
-{
- return asio_handler_alloc_helpers::allocate(
- size, this_handler->handler_);
-}
-
-template <typename Stream, typename Operation, typename Handler>
-inline void asio_handler_deallocate(void* pointer, std::size_t size,
- io_op<Stream, Operation, Handler>* this_handler)
-{
- asio_handler_alloc_helpers::deallocate(
- pointer, size, this_handler->handler_);
-}
-
-template <typename Stream, typename Operation, typename Handler>
-inline bool asio_handler_is_continuation(
- io_op<Stream, Operation, Handler>* this_handler)
-{
- return this_handler->start_ == 0 ? true
- : asio_handler_cont_helpers::is_continuation(this_handler->handler_);
-}
-
-template <typename Function, typename Stream,
- typename Operation, typename Handler>
-inline void asio_handler_invoke(Function& function,
- io_op<Stream, Operation, Handler>* this_handler)
-{
- asio_handler_invoke_helpers::invoke(
- function, this_handler->handler_);
-}
-
-template <typename Function, typename Stream,
- typename Operation, typename Handler>
-inline void asio_handler_invoke(const Function& function,
- io_op<Stream, Operation, Handler>* this_handler)
-{
- asio_handler_invoke_helpers::invoke(
- function, this_handler->handler_);
-}
-
-template <typename Stream, typename Operation, typename Handler>
-inline void async_io(Stream& next_layer, stream_core& core,
- const Operation& op, Handler& handler)
-{
- io_op<Stream, Operation, Handler>(
- next_layer, core, op, handler)(
- asio::error_code(), 0, 1);
-}
-
-} // namespace detail
-} // namespace ssl
-
-template <typename Stream, typename Operation,
- typename Handler, typename Allocator>
-struct associated_allocator<
- ssl::detail::io_op<Stream, Operation, Handler>, Allocator>
-{
- typedef typename associated_allocator<Handler, Allocator>::type type;
-
- static type get(const ssl::detail::io_op<Stream, Operation, Handler>& h,
- const Allocator& a = Allocator()) ASIO_NOEXCEPT
- {
- return associated_allocator<Handler, Allocator>::get(h.handler_, a);
- }
-};
-
-template <typename Stream, typename Operation,
- typename Handler, typename Executor>
-struct associated_executor<
- ssl::detail::io_op<Stream, Operation, Handler>, Executor>
-{
- typedef typename associated_executor<Handler, Executor>::type type;
-
- static type get(const ssl::detail::io_op<Stream, Operation, Handler>& h,
- const Executor& ex = Executor()) ASIO_NOEXCEPT
- {
- return associated_executor<Handler, Executor>::get(h.handler_, ex);
- }
-};
-
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // ASIO_SSL_DETAIL_IO_HPP