Added boost header

test/external/boost/asio/buffered_read_stream.hpp

@@ -0,0 +1,377 @@
+//
+// buffered_read_stream.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2011 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_BUFFERED_READ_STREAM_HPP
+#define BOOST_ASIO_BUFFERED_READ_STREAM_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <cstddef>
+#include <boost/type_traits/remove_reference.hpp>
+#include <boost/asio/buffered_read_stream_fwd.hpp>
+#include <boost/asio/buffer.hpp>
+#include <boost/asio/detail/bind_handler.hpp>
+#include <boost/asio/detail/buffer_resize_guard.hpp>
+#include <boost/asio/detail/buffered_stream_storage.hpp>
+#include <boost/asio/detail/noncopyable.hpp>
+#include <boost/asio/error.hpp>
+#include <boost/asio/io_service.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+/// Adds buffering to the read-related operations of a stream.
+/**
+ * The buffered_read_stream class template can be used to add buffering to the
+ * synchronous and asynchronous read operations of a stream.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ *
+ * @par Concepts:
+ * AsyncReadStream, AsyncWriteStream, Stream, Sync_Read_Stream, SyncWriteStream.
+ */
+template <typename Stream>
+class buffered_read_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_read_stream(Arg& a)
+    : next_layer_(a),
+      storage_(default_buffer_size)
+  {
+  }
+
+  /// Construct, passing the specified argument to initialise the next layer.
+  template <typename Arg>
+  buffered_read_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();
+  }
+
+  /// Get the io_service associated with the object.
+  boost::asio::io_service& get_io_service()
+  {
+    return next_layer_.get_io_service();
+  }
+
+  /// Close the stream.
+  void close()
+  {
+    next_layer_.close();
+  }
+
+  /// Close the stream.
+  boost::system::error_code close(boost::system::error_code& ec)
+  {
+    return next_layer_.close(ec);
+  }
+
+  /// 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)
+  {
+    return next_layer_.write_some(buffers);
+  }
+
+  /// Write the given data to the stream. Returns the number of bytes written,
+  /// or 0 if an error occurred.
+  template <typename ConstBufferSequence>
+  std::size_t write_some(const ConstBufferSequence& buffers,
+      boost::system::error_code& ec)
+  {
+    return next_layer_.write_some(buffers, ec);
+  }
+
+  /// 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)
+  {
+    next_layer_.async_write_some(buffers, handler);
+  }
+
+  /// Fill the buffer with some data. Returns the number of bytes placed in the
+  /// buffer as a result of the operation. Throws an exception on failure.
+  std::size_t 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;
+  }
+
+  /// Fill the buffer with some data. Returns the number of bytes placed in the
+  /// buffer as a result of the operation, or 0 if an error occurred.
+  std::size_t fill(boost::system::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;
+  }
+
+  template <typename ReadHandler>
+  class fill_handler
+  {
+  public:
+    fill_handler(boost::asio::io_service& io_service,
+        detail::buffered_stream_storage& storage,
+        std::size_t previous_size, ReadHandler handler)
+      : io_service_(io_service),
+        storage_(storage),
+        previous_size_(previous_size),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const boost::system::error_code& ec,
+        std::size_t bytes_transferred)
+    {
+      storage_.resize(previous_size_ + bytes_transferred);
+      io_service_.dispatch(detail::bind_handler(
+            handler_, ec, bytes_transferred));
+    }
+
+  private:
+    boost::asio::io_service& io_service_;
+    detail::buffered_stream_storage& storage_;
+    std::size_t previous_size_;
+    ReadHandler handler_;
+  };
+
+  /// Start an asynchronous fill.
+  template <typename ReadHandler>
+  void async_fill(ReadHandler 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),
+        fill_handler<ReadHandler>(get_io_service(),
+          storage_, previous_size, handler));
+  }
+
+  /// 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)
+  {
+    if (boost::asio::buffer_size(buffers) == 0)
+      return 0;
+
+    if (storage_.empty())
+      fill();
+
+    return copy(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,
+      boost::system::error_code& ec)
+  {
+    ec = boost::system::error_code();
+
+    if (boost::asio::buffer_size(buffers) == 0)
+      return 0;
+
+    if (storage_.empty() && !fill(ec))
+      return 0;
+
+    return copy(buffers);
+  }
+
+  template <typename MutableBufferSequence, typename ReadHandler>
+  class read_some_handler
+  {
+  public:
+    read_some_handler(boost::asio::io_service& io_service,
+        detail::buffered_stream_storage& storage,
+        const MutableBufferSequence& buffers, ReadHandler handler)
+      : io_service_(io_service),
+        storage_(storage),
+        buffers_(buffers),
+        handler_(handler)
+    {
+    }
+
+    void operator()(const boost::system::error_code& ec, std::size_t)
+    {
+      if (ec || storage_.empty())
+      {
+        std::size_t length = 0;
+        io_service_.dispatch(detail::bind_handler(handler_, ec, length));
+      }
+      else
+      {
+        std::size_t bytes_copied = boost::asio::buffer_copy(
+            buffers_, storage_.data(), storage_.size());
+        storage_.consume(bytes_copied);
+        io_service_.dispatch(detail::bind_handler(handler_, ec, bytes_copied));
+      }
+    }
+
+  private:
+    boost::asio::io_service& io_service_;
+    detail::buffered_stream_storage& storage_;
+    MutableBufferSequence buffers_;
+    ReadHandler handler_;
+  };
+
+  /// 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)
+  {
+    if (boost::asio::buffer_size(buffers) == 0)
+    {
+      get_io_service().post(detail::bind_handler(
+            handler, boost::system::error_code(), 0));
+    }
+    else if (storage_.empty())
+    {
+      async_fill(read_some_handler<MutableBufferSequence, ReadHandler>(
+            get_io_service(), storage_, buffers, handler));
+    }
+    else
+    {
+      std::size_t length = copy(buffers);
+      get_io_service().post(detail::bind_handler(
+            handler, boost::system::error_code(), length));
+    }
+  }
+
+  /// 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)
+  {
+    if (storage_.empty())
+      fill();
+    return peek_copy(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,
+      boost::system::error_code& ec)
+  {
+    ec = boost::system::error_code();
+    if (storage_.empty() && !fill(ec))
+      return 0;
+    return peek_copy(buffers);
+  }
+
+  /// Determine the amount of data that may be read without blocking.
+  std::size_t in_avail()
+  {
+    return storage_.size();
+  }
+
+  /// Determine the amount of data that may be read without blocking.
+  std::size_t in_avail(boost::system::error_code& ec)
+  {
+    ec = boost::system::error_code();
+    return storage_.size();
+  }
+
+private:
+  /// Copy data out of the internal buffer to the specified target buffer.
+  /// Returns the number of bytes copied.
+  template <typename MutableBufferSequence>
+  std::size_t copy(const MutableBufferSequence& buffers)
+  {
+    std::size_t bytes_copied = boost::asio::buffer_copy(
+        buffers, storage_.data(), storage_.size());
+    storage_.consume(bytes_copied);
+    return bytes_copied;
+  }
+
+  /// Copy data from the internal buffer to the specified target buffer, without
+  /// removing the data from the internal buffer. Returns the number of bytes
+  /// copied.
+  template <typename MutableBufferSequence>
+  std::size_t peek_copy(const MutableBufferSequence& buffers)
+  {
+    return boost::asio::buffer_copy(buffers, storage_.data(), storage_.size());
+  }
+
+  /// The next layer.
+  Stream next_layer_;
+
+  // The data in the buffer.
+  detail::buffered_stream_storage storage_;
+};
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_BUFFERED_READ_STREAM_HPP