/usr/include/asio/buffered_write_stream.hpp is in libasio-dev 1.4.1-3ubuntu2.
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// buffered_write_stream.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~
//
// 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 ASIO_BUFFERED_WRITE_STREAM_HPP
#define ASIO_BUFFERED_WRITE_STREAM_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/push_options.hpp"
#include "asio/detail/push_options.hpp"
#include <cstddef>
#include <cstring>
#include <boost/config.hpp>
#include <boost/type_traits.hpp>
#include "asio/detail/pop_options.hpp"
#include "asio/buffered_write_stream_fwd.hpp"
#include "asio/buffer.hpp"
#include "asio/completion_condition.hpp"
#include "asio/error.hpp"
#include "asio/io_service.hpp"
#include "asio/write.hpp"
#include "asio/detail/bind_handler.hpp"
#include "asio/detail/buffered_stream_storage.hpp"
#include "asio/detail/noncopyable.hpp"
namespace asio {
/// Adds buffering to the write-related operations of a stream.
/**
* The buffered_write_stream class template can be used to add buffering to the
* synchronous and asynchronous write operations of a stream.
*
* @par Thread Safety
* @e Distinct @e objects: Safe.@n
* @e Shared @e objects: Unsafe.
*
* @par Concepts:
* AsyncReadStream, AsyncWriteStream, Stream, SyncReadStream, SyncWriteStream.
*/
template <typename Stream>
class buffered_write_stream
: private noncopyable
{
public:
/// The type of the next layer.
typedef typename boost::remove_reference<Stream>::type next_layer_type;
/// The type of the lowest layer.
typedef typename next_layer_type::lowest_layer_type lowest_layer_type;
#if defined(GENERATING_DOCUMENTATION)
/// The default buffer size.
static const std::size_t default_buffer_size = implementation_defined;
#else
BOOST_STATIC_CONSTANT(std::size_t, default_buffer_size = 1024);
#endif
/// Construct, passing the specified argument to initialise the next layer.
template <typename Arg>
explicit buffered_write_stream(Arg& a)
: next_layer_(a),
storage_(default_buffer_size)
{
}
/// Construct, passing the specified argument to initialise the next layer.
template <typename Arg>
buffered_write_stream(Arg& a, std::size_t buffer_size)
: next_layer_(a),
storage_(buffer_size)
{
}
/// Get a reference to the next layer.
next_layer_type& next_layer()
{
return next_layer_;
}
/// Get a reference to the lowest layer.
lowest_layer_type& lowest_layer()
{
return next_layer_.lowest_layer();
}
/// Get a const reference to the lowest layer.
const lowest_layer_type& lowest_layer() const
{
return next_layer_.lowest_layer();
}
/// (Deprecated: use get_io_service().) Get the io_service associated with
/// the object.
asio::io_service& io_service()
{
return next_layer_.get_io_service();
}
/// Get the io_service associated with the object.
asio::io_service& get_io_service()
{
return next_layer_.get_io_service();
}
/// Close the stream.
void close()
{
next_layer_.close();
}
/// Close the stream.
asio::error_code close(asio::error_code& ec)
{
return next_layer_.close(ec);
}
/// Flush all data from the buffer to the next layer. Returns the number of
/// bytes written to the next layer on the last write operation. Throws an
/// exception on failure.
std::size_t flush()
{
std::size_t bytes_written = write(next_layer_,
buffer(storage_.data(), storage_.size()));
storage_.consume(bytes_written);
return bytes_written;
}
/// Flush all data from the buffer to the next layer. Returns the number of
/// bytes written to the next layer on the last write operation, or 0 if an
/// error occurred.
std::size_t flush(asio::error_code& ec)
{
std::size_t bytes_written = write(next_layer_,
buffer(storage_.data(), storage_.size()),
transfer_all(), ec);
storage_.consume(bytes_written);
return bytes_written;
}
template <typename WriteHandler>
class flush_handler
{
public:
flush_handler(asio::io_service& io_service,
detail::buffered_stream_storage& storage, WriteHandler handler)
: io_service_(io_service),
storage_(storage),
handler_(handler)
{
}
void operator()(const asio::error_code& ec,
std::size_t bytes_written)
{
storage_.consume(bytes_written);
io_service_.dispatch(detail::bind_handler(handler_, ec, bytes_written));
}
private:
asio::io_service& io_service_;
detail::buffered_stream_storage& storage_;
WriteHandler handler_;
};
/// Start an asynchronous flush.
template <typename WriteHandler>
void async_flush(WriteHandler handler)
{
async_write(next_layer_, buffer(storage_.data(), storage_.size()),
flush_handler<WriteHandler>(get_io_service(), storage_, handler));
}
/// Write the given data to the stream. Returns the number of bytes written.
/// Throws an exception on failure.
template <typename ConstBufferSequence>
std::size_t write_some(const ConstBufferSequence& buffers)
{
if (storage_.size() == storage_.capacity())
flush();
return copy(buffers);
}
/// Write the given data to the stream. Returns the number of bytes written,
/// or 0 if an error occurred and the error handler did not throw.
template <typename ConstBufferSequence>
std::size_t write_some(const ConstBufferSequence& buffers,
asio::error_code& ec)
{
ec = asio::error_code();
if (storage_.size() == storage_.capacity() && !flush(ec))
return 0;
return copy(buffers);
}
template <typename ConstBufferSequence, typename WriteHandler>
class write_some_handler
{
public:
write_some_handler(asio::io_service& io_service,
detail::buffered_stream_storage& storage,
const ConstBufferSequence& buffers, WriteHandler handler)
: io_service_(io_service),
storage_(storage),
buffers_(buffers),
handler_(handler)
{
}
void operator()(const asio::error_code& ec, std::size_t)
{
if (ec)
{
std::size_t length = 0;
io_service_.dispatch(detail::bind_handler(handler_, ec, length));
}
else
{
using namespace std; // For memcpy.
std::size_t orig_size = storage_.size();
std::size_t space_avail = storage_.capacity() - orig_size;
std::size_t bytes_copied = 0;
typename ConstBufferSequence::const_iterator iter = buffers_.begin();
typename ConstBufferSequence::const_iterator end = buffers_.end();
for (; iter != end && space_avail > 0; ++iter)
{
std::size_t bytes_avail = buffer_size(*iter);
std::size_t length = (bytes_avail < space_avail)
? bytes_avail : space_avail;
storage_.resize(orig_size + bytes_copied + length);
memcpy(storage_.data() + orig_size + bytes_copied,
buffer_cast<const void*>(*iter), length);
bytes_copied += length;
space_avail -= length;
}
io_service_.dispatch(detail::bind_handler(handler_, ec, bytes_copied));
}
}
private:
asio::io_service& io_service_;
detail::buffered_stream_storage& storage_;
ConstBufferSequence buffers_;
WriteHandler handler_;
};
/// Start an asynchronous write. The data being written must be valid for the
/// lifetime of the asynchronous operation.
template <typename ConstBufferSequence, typename WriteHandler>
void async_write_some(const ConstBufferSequence& buffers,
WriteHandler handler)
{
if (storage_.size() == storage_.capacity())
{
async_flush(write_some_handler<ConstBufferSequence, WriteHandler>(
get_io_service(), storage_, buffers, handler));
}
else
{
std::size_t bytes_copied = copy(buffers);
get_io_service().post(detail::bind_handler(
handler, asio::error_code(), bytes_copied));
}
}
/// Read some data from the stream. Returns the number of bytes read. Throws
/// an exception on failure.
template <typename MutableBufferSequence>
std::size_t read_some(const MutableBufferSequence& buffers)
{
return next_layer_.read_some(buffers);
}
/// Read some data from the stream. Returns the number of bytes read or 0 if
/// an error occurred.
template <typename MutableBufferSequence>
std::size_t read_some(const MutableBufferSequence& buffers,
asio::error_code& ec)
{
return next_layer_.read_some(buffers, ec);
}
/// Start an asynchronous read. The buffer into which the data will be read
/// must be valid for the lifetime of the asynchronous operation.
template <typename MutableBufferSequence, typename ReadHandler>
void async_read_some(const MutableBufferSequence& buffers,
ReadHandler handler)
{
next_layer_.async_read_some(buffers, handler);
}
/// Peek at the incoming data on the stream. Returns the number of bytes read.
/// Throws an exception on failure.
template <typename MutableBufferSequence>
std::size_t peek(const MutableBufferSequence& buffers)
{
return next_layer_.peek(buffers);
}
/// Peek at the incoming data on the stream. Returns the number of bytes read,
/// or 0 if an error occurred.
template <typename MutableBufferSequence>
std::size_t peek(const MutableBufferSequence& buffers,
asio::error_code& ec)
{
return next_layer_.peek(buffers, ec);
}
/// Determine the amount of data that may be read without blocking.
std::size_t in_avail()
{
return next_layer_.in_avail();
}
/// Determine the amount of data that may be read without blocking.
std::size_t in_avail(asio::error_code& ec)
{
return next_layer_.in_avail(ec);
}
private:
/// Copy data into the internal buffer from the specified source buffer.
/// Returns the number of bytes copied.
template <typename ConstBufferSequence>
std::size_t copy(const ConstBufferSequence& buffers)
{
using namespace std; // For memcpy.
std::size_t orig_size = storage_.size();
std::size_t space_avail = storage_.capacity() - orig_size;
std::size_t bytes_copied = 0;
typename ConstBufferSequence::const_iterator iter = buffers.begin();
typename ConstBufferSequence::const_iterator end = buffers.end();
for (; iter != end && space_avail > 0; ++iter)
{
std::size_t bytes_avail = buffer_size(*iter);
std::size_t length = (bytes_avail < space_avail)
? bytes_avail : space_avail;
storage_.resize(orig_size + bytes_copied + length);
memcpy(storage_.data() + orig_size + bytes_copied,
buffer_cast<const void*>(*iter), length);
bytes_copied += length;
space_avail -= length;
}
return bytes_copied;
}
/// The next layer.
Stream next_layer_;
// The data in the buffer.
detail::buffered_stream_storage storage_;
};
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_BUFFERED_WRITE_STREAM_HPP
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