aboutsummaryrefslogtreecommitdiffstats
path: root/lib/asio/ssl/detail/io.hpp
diff options
context:
space:
mode:
Diffstat (limited to 'lib/asio/ssl/detail/io.hpp')
-rw-r--r--lib/asio/ssl/detail/io.hpp372
1 files changed, 372 insertions, 0 deletions
diff --git a/lib/asio/ssl/detail/io.hpp b/lib/asio/ssl/detail/io.hpp
new file mode 100644
index 0000000..0b0e51a
--- /dev/null
+++ b/lib/asio/ssl/detail/io.hpp
@@ -0,0 +1,372 @@
+//
+// 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