boost/asio/impl/read.ipp
//
// read.ipp
// ~~~~~~~~
//
// Copyright (c) 2003-2008 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 BOOST_ASIO_READ_IPP
#define BOOST_ASIO_READ_IPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/push_options.hpp>
#include <boost/asio/detail/push_options.hpp>
#include <algorithm>
#include <boost/asio/detail/pop_options.hpp>
#include <boost/asio/buffer.hpp>
#include <boost/asio/completion_condition.hpp>
#include <boost/asio/error.hpp>
#include <boost/asio/detail/bind_handler.hpp>
#include <boost/asio/detail/consuming_buffers.hpp>
#include <boost/asio/detail/handler_alloc_helpers.hpp>
#include <boost/asio/detail/handler_invoke_helpers.hpp>
#include <boost/asio/detail/throw_error.hpp>
namespace boost {
namespace asio {
template <typename SyncReadStream, typename MutableBufferSequence,
typename CompletionCondition>
std::size_t read(SyncReadStream& s, const MutableBufferSequence& buffers,
CompletionCondition completion_condition, boost::system::error_code& ec)
{
ec = boost::system::error_code();
boost::asio::detail::consuming_buffers<
mutable_buffer, MutableBufferSequence> tmp(buffers);
std::size_t total_transferred = 0;
tmp.set_max_size(detail::adapt_completion_condition_result(
completion_condition(ec, total_transferred)));
while (tmp.begin() != tmp.end())
{
std::size_t bytes_transferred = s.read_some(tmp, ec);
tmp.consume(bytes_transferred);
total_transferred += bytes_transferred;
tmp.set_max_size(detail::adapt_completion_condition_result(
completion_condition(ec, total_transferred)));
}
return total_transferred;
}
template <typename SyncReadStream, typename MutableBufferSequence>
inline std::size_t read(SyncReadStream& s, const MutableBufferSequence& buffers)
{
boost::system::error_code ec;
std::size_t bytes_transferred = read(s, buffers, transfer_all(), ec);
boost::asio::detail::throw_error(ec);
return bytes_transferred;
}
template <typename SyncReadStream, typename MutableBufferSequence,
typename CompletionCondition>
inline std::size_t read(SyncReadStream& s, const MutableBufferSequence& buffers,
CompletionCondition completion_condition)
{
boost::system::error_code ec;
std::size_t bytes_transferred = read(s, buffers, completion_condition, ec);
boost::asio::detail::throw_error(ec);
return bytes_transferred;
}
template <typename SyncReadStream, typename Allocator,
typename CompletionCondition>
std::size_t read(SyncReadStream& s,
boost::asio::basic_streambuf<Allocator>& b,
CompletionCondition completion_condition, boost::system::error_code& ec)
{
ec = boost::system::error_code();
std::size_t total_transferred = 0;
std::size_t max_size = detail::adapt_completion_condition_result(
completion_condition(ec, total_transferred));
std::size_t bytes_available = std::min<std::size_t>(512,
std::min<std::size_t>(max_size, b.max_size() - b.size()));
while (bytes_available > 0)
{
std::size_t bytes_transferred = s.read_some(b.prepare(bytes_available), ec);
b.commit(bytes_transferred);
total_transferred += bytes_transferred;
max_size = detail::adapt_completion_condition_result(
completion_condition(ec, total_transferred));
bytes_available = std::min<std::size_t>(512,
std::min<std::size_t>(max_size, b.max_size() - b.size()));
}
return total_transferred;
}
template <typename SyncReadStream, typename Allocator>
inline std::size_t read(SyncReadStream& s,
boost::asio::basic_streambuf<Allocator>& b)
{
boost::system::error_code ec;
std::size_t bytes_transferred = read(s, b, transfer_all(), ec);
boost::asio::detail::throw_error(ec);
return bytes_transferred;
}
template <typename SyncReadStream, typename Allocator,
typename CompletionCondition>
inline std::size_t read(SyncReadStream& s,
boost::asio::basic_streambuf<Allocator>& b,
CompletionCondition completion_condition)
{
boost::system::error_code ec;
std::size_t bytes_transferred = read(s, b, completion_condition, ec);
boost::asio::detail::throw_error(ec);
return bytes_transferred;
}
namespace detail
{
template <typename AsyncReadStream, typename MutableBufferSequence,
typename CompletionCondition, typename ReadHandler>
class read_handler
{
public:
typedef boost::asio::detail::consuming_buffers<
mutable_buffer, MutableBufferSequence> buffers_type;
read_handler(AsyncReadStream& stream, const buffers_type& buffers,
CompletionCondition completion_condition, ReadHandler handler)
: stream_(stream),
buffers_(buffers),
total_transferred_(0),
completion_condition_(completion_condition),
handler_(handler)
{
}
void operator()(const boost::system::error_code& ec,
std::size_t bytes_transferred)
{
total_transferred_ += bytes_transferred;
buffers_.consume(bytes_transferred);
buffers_.set_max_size(detail::adapt_completion_condition_result(
completion_condition_(ec, total_transferred_)));
if (buffers_.begin() == buffers_.end())
{
handler_(ec, total_transferred_);
}
else
{
stream_.async_read_some(buffers_, *this);
}
}
//private:
AsyncReadStream& stream_;
buffers_type buffers_;
std::size_t total_transferred_;
CompletionCondition completion_condition_;
ReadHandler handler_;
};
template <typename AsyncReadStream, typename MutableBufferSequence,
typename CompletionCondition, typename ReadHandler>
inline void* asio_handler_allocate(std::size_t size,
read_handler<AsyncReadStream, MutableBufferSequence,
CompletionCondition, ReadHandler>* this_handler)
{
return boost_asio_handler_alloc_helpers::allocate(
size, &this_handler->handler_);
}
template <typename AsyncReadStream, typename MutableBufferSequence,
typename CompletionCondition, typename ReadHandler>
inline void asio_handler_deallocate(void* pointer, std::size_t size,
read_handler<AsyncReadStream, MutableBufferSequence,
CompletionCondition, ReadHandler>* this_handler)
{
boost_asio_handler_alloc_helpers::deallocate(
pointer, size, &this_handler->handler_);
}
template <typename Function, typename AsyncReadStream,
typename MutableBufferSequence, typename CompletionCondition,
typename ReadHandler>
inline void asio_handler_invoke(const Function& function,
read_handler<AsyncReadStream, MutableBufferSequence,
CompletionCondition, ReadHandler>* this_handler)
{
boost_asio_handler_invoke_helpers::invoke(
function, &this_handler->handler_);
}
} // namespace detail
template <typename AsyncReadStream, typename MutableBufferSequence,
typename CompletionCondition, typename ReadHandler>
inline void async_read(AsyncReadStream& s, const MutableBufferSequence& buffers,
CompletionCondition completion_condition, ReadHandler handler)
{
boost::asio::detail::consuming_buffers<
mutable_buffer, MutableBufferSequence> tmp(buffers);
boost::system::error_code ec;
std::size_t total_transferred = 0;
tmp.set_max_size(detail::adapt_completion_condition_result(
completion_condition(ec, total_transferred)));
if (tmp.begin() == tmp.end())
{
s.get_io_service().post(detail::bind_handler(
handler, ec, total_transferred));
return;
}
s.async_read_some(tmp,
detail::read_handler<AsyncReadStream, MutableBufferSequence,
CompletionCondition, ReadHandler>(
s, tmp, completion_condition, handler));
}
template <typename AsyncReadStream, typename MutableBufferSequence,
typename ReadHandler>
inline void async_read(AsyncReadStream& s, const MutableBufferSequence& buffers,
ReadHandler handler)
{
async_read(s, buffers, transfer_all(), handler);
}
namespace detail
{
template <typename AsyncReadStream, typename Allocator,
typename CompletionCondition, typename ReadHandler>
class read_streambuf_handler
{
public:
read_streambuf_handler(AsyncReadStream& stream,
basic_streambuf<Allocator>& streambuf,
CompletionCondition completion_condition, ReadHandler handler)
: stream_(stream),
streambuf_(streambuf),
total_transferred_(0),
completion_condition_(completion_condition),
handler_(handler)
{
}
void operator()(const boost::system::error_code& ec,
std::size_t bytes_transferred)
{
total_transferred_ += bytes_transferred;
streambuf_.commit(bytes_transferred);
std::size_t max_size = detail::adapt_completion_condition_result(
completion_condition_(ec, total_transferred_));
std::size_t bytes_available = std::min<std::size_t>(512,
std::min<std::size_t>(max_size,
streambuf_.max_size() - streambuf_.size()));
if (bytes_available == 0)
{
handler_(ec, total_transferred_);
}
else
{
stream_.async_read_some(streambuf_.prepare(bytes_available), *this);
}
}
//private:
AsyncReadStream& stream_;
boost::asio::basic_streambuf<Allocator>& streambuf_;
std::size_t total_transferred_;
CompletionCondition completion_condition_;
ReadHandler handler_;
};
template <typename AsyncReadStream, typename Allocator,
typename CompletionCondition, typename ReadHandler>
inline void* asio_handler_allocate(std::size_t size,
read_streambuf_handler<AsyncReadStream, Allocator,
CompletionCondition, ReadHandler>* this_handler)
{
return boost_asio_handler_alloc_helpers::allocate(
size, &this_handler->handler_);
}
template <typename AsyncReadStream, typename Allocator,
typename CompletionCondition, typename ReadHandler>
inline void asio_handler_deallocate(void* pointer, std::size_t size,
read_streambuf_handler<AsyncReadStream, Allocator,
CompletionCondition, ReadHandler>* this_handler)
{
boost_asio_handler_alloc_helpers::deallocate(
pointer, size, &this_handler->handler_);
}
template <typename Function, typename AsyncReadStream,
typename Allocator, typename CompletionCondition, typename ReadHandler>
inline void asio_handler_invoke(const Function& function,
read_streambuf_handler<AsyncReadStream, Allocator,
CompletionCondition, ReadHandler>* this_handler)
{
boost_asio_handler_invoke_helpers::invoke(
function, &this_handler->handler_);
}
} // namespace detail
template <typename AsyncReadStream, typename Allocator,
typename CompletionCondition, typename ReadHandler>
inline void async_read(AsyncReadStream& s,
boost::asio::basic_streambuf<Allocator>& b,
CompletionCondition completion_condition, ReadHandler handler)
{
boost::system::error_code ec;
std::size_t total_transferred = 0;
std::size_t max_size = detail::adapt_completion_condition_result(
completion_condition(ec, total_transferred));
std::size_t bytes_available = std::min<std::size_t>(512,
std::min<std::size_t>(max_size, b.max_size() - b.size()));
if (bytes_available == 0)
{
s.get_io_service().post(detail::bind_handler(
handler, ec, total_transferred));
return;
}
s.async_read_some(b.prepare(bytes_available),
detail::read_streambuf_handler<AsyncReadStream, Allocator,
CompletionCondition, ReadHandler>(
s, b, completion_condition, handler));
}
template <typename AsyncReadStream, typename Allocator, typename ReadHandler>
inline void async_read(AsyncReadStream& s,
boost::asio::basic_streambuf<Allocator>& b, ReadHandler handler)
{
async_read(s, b, transfer_all(), handler);
}
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_READ_IPP