528 lines
16 KiB
C++
528 lines
16 KiB
C++
//
|
|
// impl/buffered_read_stream.hpp
|
|
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
//
|
|
// Copyright (c) 2003-2023 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/associator.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/non_const_lvalue.hpp"
|
|
#include "asio/detail/type_traits.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);
|
|
ASIO_MOVE_OR_LVALUE(ReadHandler)(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(ASIO_NO_DEPRECATED)
|
|
asio_handler_alloc_helpers::allocate(size, this_handler->handler_);
|
|
return asio_handler_allocate_is_no_longer_used();
|
|
#else // defined(ASIO_NO_DEPRECATED)
|
|
return asio_handler_alloc_helpers::allocate(
|
|
size, this_handler->handler_);
|
|
#endif // defined(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)
|
|
{
|
|
asio_handler_alloc_helpers::deallocate(
|
|
pointer, size, this_handler->handler_);
|
|
#if defined(ASIO_NO_DEPRECATED)
|
|
return asio_handler_deallocate_is_no_longer_used();
|
|
#endif // defined(ASIO_NO_DEPRECATED)
|
|
}
|
|
|
|
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 asio_handler_invoke_is_deprecated
|
|
asio_handler_invoke(Function& function,
|
|
buffered_fill_handler<ReadHandler>* this_handler)
|
|
{
|
|
asio_handler_invoke_helpers::invoke(
|
|
function, this_handler->handler_);
|
|
#if defined(ASIO_NO_DEPRECATED)
|
|
return asio_handler_invoke_is_no_longer_used();
|
|
#endif // defined(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)
|
|
{
|
|
asio_handler_invoke_helpers::invoke(
|
|
function, this_handler->handler_);
|
|
#if defined(ASIO_NO_DEPRECATED)
|
|
return asio_handler_invoke_is_no_longer_used();
|
|
#endif // defined(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 ASIO_NOEXCEPT
|
|
{
|
|
return next_layer_.lowest_layer().get_executor();
|
|
}
|
|
|
|
template <typename ReadHandler>
|
|
void operator()(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.
|
|
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 <template <typename, typename> class Associator,
|
|
typename ReadHandler, typename DefaultCandidate>
|
|
struct associator<Associator,
|
|
detail::buffered_fill_handler<ReadHandler>,
|
|
DefaultCandidate>
|
|
: Associator<ReadHandler, DefaultCandidate>
|
|
{
|
|
static typename Associator<ReadHandler, DefaultCandidate>::type
|
|
get(const detail::buffered_fill_handler<ReadHandler>& h) ASIO_NOEXCEPT
|
|
{
|
|
return Associator<ReadHandler, DefaultCandidate>::get(h.handler_);
|
|
}
|
|
|
|
static ASIO_AUTO_RETURN_TYPE_PREFIX2(
|
|
typename Associator<ReadHandler, DefaultCandidate>::type)
|
|
get(const detail::buffered_fill_handler<ReadHandler>& h,
|
|
const DefaultCandidate& c) ASIO_NOEXCEPT
|
|
ASIO_AUTO_RETURN_TYPE_SUFFIX((
|
|
Associator<ReadHandler, DefaultCandidate>::get(h.handler_, c)))
|
|
{
|
|
return Associator<ReadHandler, DefaultCandidate>::get(h.handler_, c);
|
|
}
|
|
};
|
|
|
|
#endif // !defined(GENERATING_DOCUMENTATION)
|
|
|
|
template <typename Stream>
|
|
template <
|
|
ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
|
|
std::size_t)) ReadHandler>
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(ReadHandler,
|
|
void (asio::error_code, std::size_t))
|
|
buffered_read_stream<Stream>::async_fill(
|
|
ASIO_MOVE_ARG(ReadHandler) handler)
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
|
|
async_initiate<ReadHandler,
|
|
void (asio::error_code, std::size_t)>(
|
|
declval<detail::initiate_async_buffered_fill<Stream> >(),
|
|
handler, declval<detail::buffered_stream_storage*>())))
|
|
{
|
|
return async_initiate<ReadHandler,
|
|
void (asio::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 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, asio::error_code& ec)
|
|
{
|
|
ec = asio::error_code();
|
|
|
|
using 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_(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;
|
|
ASIO_MOVE_OR_LVALUE(ReadHandler)(handler_)(ec, length);
|
|
}
|
|
else
|
|
{
|
|
const std::size_t bytes_copied = asio::buffer_copy(
|
|
buffers_, storage_.data(), storage_.size());
|
|
storage_.consume(bytes_copied);
|
|
ASIO_MOVE_OR_LVALUE(ReadHandler)(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(ASIO_NO_DEPRECATED)
|
|
asio_handler_alloc_helpers::allocate(size, this_handler->handler_);
|
|
return asio_handler_allocate_is_no_longer_used();
|
|
#else // defined(ASIO_NO_DEPRECATED)
|
|
return asio_handler_alloc_helpers::allocate(
|
|
size, this_handler->handler_);
|
|
#endif // defined(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)
|
|
{
|
|
asio_handler_alloc_helpers::deallocate(
|
|
pointer, size, this_handler->handler_);
|
|
#if defined(ASIO_NO_DEPRECATED)
|
|
return asio_handler_deallocate_is_no_longer_used();
|
|
#endif // defined(ASIO_NO_DEPRECATED)
|
|
}
|
|
|
|
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 asio_handler_invoke_is_deprecated
|
|
asio_handler_invoke(Function& function,
|
|
buffered_read_some_handler<
|
|
MutableBufferSequence, ReadHandler>* this_handler)
|
|
{
|
|
asio_handler_invoke_helpers::invoke(
|
|
function, this_handler->handler_);
|
|
#if defined(ASIO_NO_DEPRECATED)
|
|
return asio_handler_invoke_is_no_longer_used();
|
|
#endif // defined(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)
|
|
{
|
|
asio_handler_invoke_helpers::invoke(
|
|
function, this_handler->handler_);
|
|
#if defined(ASIO_NO_DEPRECATED)
|
|
return asio_handler_invoke_is_no_longer_used();
|
|
#endif // defined(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 ASIO_NOEXCEPT
|
|
{
|
|
return next_layer_.lowest_layer().get_executor();
|
|
}
|
|
|
|
template <typename ReadHandler, typename MutableBufferSequence>
|
|
void operator()(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.
|
|
ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
|
|
|
|
using asio::buffer_size;
|
|
non_const_lvalue<ReadHandler> handler2(handler);
|
|
if (buffer_size(buffers) == 0 || !storage->empty())
|
|
{
|
|
next_layer_.async_read_some(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 <template <typename, typename> class Associator,
|
|
typename MutableBufferSequence, typename ReadHandler,
|
|
typename DefaultCandidate>
|
|
struct associator<Associator,
|
|
detail::buffered_read_some_handler<MutableBufferSequence, ReadHandler>,
|
|
DefaultCandidate>
|
|
: Associator<ReadHandler, DefaultCandidate>
|
|
{
|
|
static typename Associator<ReadHandler, DefaultCandidate>::type
|
|
get(const detail::buffered_read_some_handler<
|
|
MutableBufferSequence, ReadHandler>& h) ASIO_NOEXCEPT
|
|
{
|
|
return Associator<ReadHandler, DefaultCandidate>::get(h.handler_);
|
|
}
|
|
|
|
static ASIO_AUTO_RETURN_TYPE_PREFIX2(
|
|
typename Associator<ReadHandler, DefaultCandidate>::type)
|
|
get(const detail::buffered_read_some_handler<
|
|
MutableBufferSequence, ReadHandler>& h,
|
|
const DefaultCandidate& c) ASIO_NOEXCEPT
|
|
ASIO_AUTO_RETURN_TYPE_SUFFIX((
|
|
Associator<ReadHandler, DefaultCandidate>::get(h.handler_, c)))
|
|
{
|
|
return Associator<ReadHandler, DefaultCandidate>::get(h.handler_, c);
|
|
}
|
|
};
|
|
|
|
#endif // !defined(GENERATING_DOCUMENTATION)
|
|
|
|
template <typename Stream>
|
|
template <typename MutableBufferSequence,
|
|
ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
|
|
std::size_t)) ReadHandler>
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(ReadHandler,
|
|
void (asio::error_code, std::size_t))
|
|
buffered_read_stream<Stream>::async_read_some(
|
|
const MutableBufferSequence& buffers,
|
|
ASIO_MOVE_ARG(ReadHandler) handler)
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
|
|
async_initiate<ReadHandler,
|
|
void (asio::error_code, std::size_t)>(
|
|
declval<detail::initiate_async_buffered_read_some<Stream> >(),
|
|
handler, declval<detail::buffered_stream_storage*>(), buffers)))
|
|
{
|
|
return async_initiate<ReadHandler,
|
|
void (asio::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, 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
|