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 1 //  // read_at.hpp  // ~~~~~~~~~~~  //  // Copyright (c) 2003-2015 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_AT_HPP  #define BOOST_ASIO_READ_AT_HPP  #if defined(_MSC_VER) && (_MSC_VER >= 1200)  # pragma once  #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)  #include  #include  #include  #include  #include  #include  #include  namespace boost {  namespace asio {  /**   * @defgroup read_at boost::asio::read_at   *   * @brief Attempt to read a certain amount of data at the specified offset   * before returning.   */  /*@{*/  /// Attempt to read a certain amount of data at the specified offset before  /// returning.  /**   * This function is used to read a certain number of bytes of data from a   * random access device at the specified offset. The call will block until one   * of the following conditions is true:   *   * @li The supplied buffers are full. That is, the bytes transferred is equal to   * the sum of the buffer sizes.   *   * @li An error occurred.   *   * This operation is implemented in terms of zero or more calls to the device's   * read_some_at function.   *   * @param d The device from which the data is to be read. The type must support   * the SyncRandomAccessReadDevice concept.   *   * @param offset The offset at which the data will be read.   *   * @param buffers One or more buffers into which the data will be read. The sum   * of the buffer sizes indicates the maximum number of bytes to read from the   * device.   *   * @returns The number of bytes transferred.   *   * @throws boost::system::system_error Thrown on failure.   *   * @par Example   * To read into a single data buffer use the @ref buffer function as follows:   * @code boost::asio::read_at(d, 42, boost::asio::buffer(data, size)); @endcode   * See the @ref buffer documentation for information on reading into multiple   * buffers in one go, and how to use it with arrays, boost::array or   * std::vector.   *   * @note This overload is equivalent to calling:   * @code boost::asio::read_at(   * d, 42, buffers,   * boost::asio::transfer_all()); @endcode   */  template  std::size_t read_at(SyncRandomAccessReadDevice& d,   uint64_t offset, const MutableBufferSequence& buffers);  /// Attempt to read a certain amount of data at the specified offset before  /// returning.  /**   * This function is used to read a certain number of bytes of data from a   * random access device at the specified offset. The call will block until one   * of the following conditions is true:   *   * @li The supplied buffers are full. That is, the bytes transferred is equal to   * the sum of the buffer sizes.   *   * @li An error occurred.   *   * This operation is implemented in terms of zero or more calls to the device's   * read_some_at function.   *   * @param d The device from which the data is to be read. The type must support   * the SyncRandomAccessReadDevice concept.   *   * @param offset The offset at which the data will be read.   *   * @param buffers One or more buffers into which the data will be read. The sum   * of the buffer sizes indicates the maximum number of bytes to read from the   * device.   *   * @param ec Set to indicate what error occurred, if any.   *   * @returns The number of bytes transferred.   *   * @par Example   * To read into a single data buffer use the @ref buffer function as follows:   * @code boost::asio::read_at(d, 42,   * boost::asio::buffer(data, size), ec); @endcode   * See the @ref buffer documentation for information on reading into multiple   * buffers in one go, and how to use it with arrays, boost::array or   * std::vector.   *   * @note This overload is equivalent to calling:   * @code boost::asio::read_at(   * d, 42, buffers,   * boost::asio::transfer_all(), ec); @endcode   */  template  std::size_t read_at(SyncRandomAccessReadDevice& d,   uint64_t offset, const MutableBufferSequence& buffers,   boost::system::error_code& ec);  /// Attempt to read a certain amount of data at the specified offset before  /// returning.  /**   * This function is used to read a certain number of bytes of data from a   * random access device at the specified offset. The call will block until one   * of the following conditions is true:   *   * @li The supplied buffers are full. That is, the bytes transferred is equal to   * the sum of the buffer sizes.   *   * @li The completion_condition function object returns 0.   *   * This operation is implemented in terms of zero or more calls to the device's   * read_some_at function.   *   * @param d The device from which the data is to be read. The type must support   * the SyncRandomAccessReadDevice concept.   *   * @param offset The offset at which the data will be read.   *   * @param buffers One or more buffers into which the data will be read. The sum   * of the buffer sizes indicates the maximum number of bytes to read from the   * device.   *   * @param completion_condition The function object to be called to determine   * whether the read operation is complete. The signature of the function object   * must be:   * @code std::size_t completion_condition(   * // Result of latest read_some_at operation.   * const boost::system::error_code& error,   *   * // Number of bytes transferred so far.   * std::size_t bytes_transferred   * ); @endcode   * A return value of 0 indicates that the read operation is complete. A non-zero   * return value indicates the maximum number of bytes to be read on the next   * call to the device's read_some_at function.   *   * @returns The number of bytes transferred.   *   * @throws boost::system::system_error Thrown on failure.   *   * @par Example   * To read into a single data buffer use the @ref buffer function as follows:   * @code boost::asio::read_at(d, 42, boost::asio::buffer(data, size),   * boost::asio::transfer_at_least(32)); @endcode   * See the @ref buffer documentation for information on reading into multiple   * buffers in one go, and how to use it with arrays, boost::array or   * std::vector.   */  template  std::size_t read_at(SyncRandomAccessReadDevice& d,   uint64_t offset, const MutableBufferSequence& buffers,   CompletionCondition completion_condition);  /// Attempt to read a certain amount of data at the specified offset before  /// returning.  /**   * This function is used to read a certain number of bytes of data from a   * random access device at the specified offset. The call will block until one   * of the following conditions is true:   *   * @li The supplied buffers are full. That is, the bytes transferred is equal to   * the sum of the buffer sizes.   *   * @li The completion_condition function object returns 0.   *   * This operation is implemented in terms of zero or more calls to the device's   * read_some_at function.   *   * @param d The device from which the data is to be read. The type must support   * the SyncRandomAccessReadDevice concept.   *   * @param offset The offset at which the data will be read.   *   * @param buffers One or more buffers into which the data will be read. The sum   * of the buffer sizes indicates the maximum number of bytes to read from the   * device.   *   * @param completion_condition The function object to be called to determine   * whether the read operation is complete. The signature of the function object   * must be:   * @code std::size_t completion_condition(   * // Result of latest read_some_at operation.   * const boost::system::error_code& error,   *   * // Number of bytes transferred so far.   * std::size_t bytes_transferred   * ); @endcode   * A return value of 0 indicates that the read operation is complete. A non-zero   * return value indicates the maximum number of bytes to be read on the next   * call to the device's read_some_at function.   *   * @param ec Set to indicate what error occurred, if any.   *   * @returns The number of bytes read. If an error occurs, returns the total   * number of bytes successfully transferred prior to the error.   */  template  std::size_t read_at(SyncRandomAccessReadDevice& d,   uint64_t offset, const MutableBufferSequence& buffers,   CompletionCondition completion_condition, boost::system::error_code& ec);  #if !defined(BOOST_ASIO_NO_IOSTREAM)  /// Attempt to read a certain amount of data at the specified offset before  /// returning.  /**   * This function is used to read a certain number of bytes of data from a   * random access device at the specified offset. The call will block until one   * of the following conditions is true:   *   * @li An error occurred.   *   * This operation is implemented in terms of zero or more calls to the device's   * read_some_at function.   *   * @param d The device from which the data is to be read. The type must support   * the SyncRandomAccessReadDevice concept.   *   * @param offset The offset at which the data will be read.   *   * @param b The basic_streambuf object into which the data will be read.   *   * @returns The number of bytes transferred.   *   * @throws boost::system::system_error Thrown on failure.   *   * @note This overload is equivalent to calling:   * @code boost::asio::read_at(   * d, 42, b,   * boost::asio::transfer_all()); @endcode   */  template  std::size_t read_at(SyncRandomAccessReadDevice& d,   uint64_t offset, basic_streambuf& b);  /// Attempt to read a certain amount of data at the specified offset before  /// returning.  /**   * This function is used to read a certain number of bytes of data from a   * random access device at the specified offset. The call will block until one   * of the following conditions is true:   *   * @li An error occurred.   *   * This operation is implemented in terms of zero or more calls to the device's   * read_some_at function.   *   * @param d The device from which the data is to be read. The type must support   * the SyncRandomAccessReadDevice concept.   *   * @param offset The offset at which the data will be read.   *   * @param b The basic_streambuf object into which the data will be read.   *   * @param ec Set to indicate what error occurred, if any.   *   * @returns The number of bytes transferred.   *   * @note This overload is equivalent to calling:   * @code boost::asio::read_at(   * d, 42, b,   * boost::asio::transfer_all(), ec); @endcode   */  template  std::size_t read_at(SyncRandomAccessReadDevice& d,   uint64_t offset, basic_streambuf& b,   boost::system::error_code& ec);  /// Attempt to read a certain amount of data at the specified offset before  /// returning.  /**   * This function is used to read a certain number of bytes of data from a   * random access device at the specified offset. The call will block until one   * of the following conditions is true:   *   * @li The completion_condition function object returns 0.   *   * This operation is implemented in terms of zero or more calls to the device's   * read_some_at function.   *   * @param d The device from which the data is to be read. The type must support   * the SyncRandomAccessReadDevice concept.   *   * @param offset The offset at which the data will be read.   *   * @param b The basic_streambuf object into which the data will be read.   *   * @param completion_condition The function object to be called to determine   * whether the read operation is complete. The signature of the function object   * must be:   * @code std::size_t completion_condition(   * // Result of latest read_some_at operation.   * const boost::system::error_code& error,   *   * // Number of bytes transferred so far.   * std::size_t bytes_transferred   * ); @endcode   * A return value of 0 indicates that the read operation is complete. A non-zero   * return value indicates the maximum number of bytes to be read on the next   * call to the device's read_some_at function.   *   * @returns The number of bytes transferred.   *   * @throws boost::system::system_error Thrown on failure.   */  template  std::size_t read_at(SyncRandomAccessReadDevice& d,   uint64_t offset, basic_streambuf& b,   CompletionCondition completion_condition);  /// Attempt to read a certain amount of data at the specified offset before  /// returning.  /**   * This function is used to read a certain number of bytes of data from a   * random access device at the specified offset. The call will block until one   * of the following conditions is true:   *   * @li The completion_condition function object returns 0.   *   * This operation is implemented in terms of zero or more calls to the device's   * read_some_at function.   *   * @param d The device from which the data is to be read. The type must support   * the SyncRandomAccessReadDevice concept.   *   * @param offset The offset at which the data will be read.   *   * @param b The basic_streambuf object into which the data will be read.   *   * @param completion_condition The function object to be called to determine   * whether the read operation is complete. The signature of the function object   * must be:   * @code std::size_t completion_condition(   * // Result of latest read_some_at operation.   * const boost::system::error_code& error,   *   * // Number of bytes transferred so far.   * std::size_t bytes_transferred   * ); @endcode   * A return value of 0 indicates that the read operation is complete. A non-zero   * return value indicates the maximum number of bytes to be read on the next   * call to the device's read_some_at function.   *   * @param ec Set to indicate what error occurred, if any.   *   * @returns The number of bytes read. If an error occurs, returns the total   * number of bytes successfully transferred prior to the error.   */  template  std::size_t read_at(SyncRandomAccessReadDevice& d,   uint64_t offset, basic_streambuf& b,   CompletionCondition completion_condition, boost::system::error_code& ec);  #endif // !defined(BOOST_ASIO_NO_IOSTREAM)  /*@}*/  /**   * @defgroup async_read_at boost::asio::async_read_at   *   * @brief Start an asynchronous operation to read a certain amount of data at   * the specified offset.   */  /*@{*/  /// Start an asynchronous operation to read a certain amount of data at the  /// specified offset.  /**   * This function is used to asynchronously read a certain number of bytes of   * data from a random access device at the specified offset. The function call   * always returns immediately. The asynchronous operation will continue until   * one of the following conditions is true:   *   * @li The supplied buffers are full. That is, the bytes transferred is equal to   * the sum of the buffer sizes.   *   * @li An error occurred.   *   * This operation is implemented in terms of zero or more calls to the device's   * async_read_some_at function.   *   * @param d The device from which the data is to be read. The type must support   * the AsyncRandomAccessReadDevice concept.   *   * @param offset The offset at which the data will be read.   *   * @param buffers One or more buffers into which the data will be read. The sum   * of the buffer sizes indicates the maximum number of bytes to read from the   * device. Although the buffers object may be copied as necessary, ownership of   * the underlying memory blocks is retained by the caller, which must guarantee   * that they remain valid until the handler is called.   *   * @param handler The handler to be called when the read operation completes.   * Copies will be made of the handler as required. The function signature of the   * handler must be:   * @code void handler(   * // Result of operation.   * const boost::system::error_code& error,   *   * // Number of bytes copied into the buffers. If an error   * // occurred, this will be the number of bytes successfully   * // transferred prior to the error.   * std::size_t bytes_transferred   * ); @endcode   * Regardless of whether the asynchronous operation completes immediately or   * not, the handler will not be invoked from within this function. Invocation of   * the handler will be performed in a manner equivalent to using   * boost::asio::io_service::post().   *   * @par Example   * To read into a single data buffer use the @ref buffer function as follows:   * @code   * boost::asio::async_read_at(d, 42, boost::asio::buffer(data, size), handler);   * @endcode   * See the @ref buffer documentation for information on reading into multiple   * buffers in one go, and how to use it with arrays, boost::array or   * std::vector.   *   * @note This overload is equivalent to calling:   * @code boost::asio::async_read_at(   * d, 42, buffers,   * boost::asio::transfer_all(),   * handler); @endcode   */  template  BOOST_ASIO_INITFN_RESULT_TYPE(ReadHandler,   void (boost::system::error_code, std::size_t))  async_read_at(AsyncRandomAccessReadDevice& d, uint64_t offset,   const MutableBufferSequence& buffers,   BOOST_ASIO_MOVE_ARG(ReadHandler) handler);  /// Start an asynchronous operation to read a certain amount of data at the  /// specified offset.  /**   * This function is used to asynchronously read a certain number of bytes of   * data from a random access device at the specified offset. The function call   * always returns immediately. The asynchronous operation will continue until   * one of the following conditions is true:   *   * @li The supplied buffers are full. That is, the bytes transferred is equal to   * the sum of the buffer sizes.   *   * @li The completion_condition function object returns 0.   *   * @param d The device from which the data is to be read. The type must support   * the AsyncRandomAccessReadDevice concept.   *   * @param offset The offset at which the data will be read.   *   * @param buffers One or more buffers into which the data will be read. The sum   * of the buffer sizes indicates the maximum number of bytes to read from the   * device. Although the buffers object may be copied as necessary, ownership of   * the underlying memory blocks is retained by the caller, which must guarantee   * that they remain valid until the handler is called.   *   * @param completion_condition The function object to be called to determine   * whether the read operation is complete. The signature of the function object   * must be:   * @code std::size_t completion_condition(   * // Result of latest async_read_some_at operation.   * const boost::system::error_code& error,   *   * // Number of bytes transferred so far.   * std::size_t bytes_transferred   * ); @endcode   * A return value of 0 indicates that the read operation is complete. A non-zero   * return value indicates the maximum number of bytes to be read on the next   * call to the device's async_read_some_at function.   *   * @param handler The handler to be called when the read operation completes.   * Copies will be made of the handler as required. The function signature of the   * handler must be:   * @code void handler(   * // Result of operation.   * const boost::system::error_code& error,   *   * // Number of bytes copied into the buffers. If an error   * // occurred, this will be the number of bytes successfully   * // transferred prior to the error.   * std::size_t bytes_transferred   * ); @endcode   * Regardless of whether the asynchronous operation completes immediately or   * not, the handler will not be invoked from within this function. Invocation of   * the handler will be performed in a manner equivalent to using   * boost::asio::io_service::post().   *   * @par Example   * To read into a single data buffer use the @ref buffer function as follows:   * @code boost::asio::async_read_at(d, 42,   * boost::asio::buffer(data, size),   * boost::asio::transfer_at_least(32),   * handler); @endcode   * See the @ref buffer documentation for information on reading into multiple   * buffers in one go, and how to use it with arrays, boost::array or   * std::vector.   */  template  BOOST_ASIO_INITFN_RESULT_TYPE(ReadHandler,   void (boost::system::error_code, std::size_t))  async_read_at(AsyncRandomAccessReadDevice& d,   uint64_t offset, const MutableBufferSequence& buffers,   CompletionCondition completion_condition,   BOOST_ASIO_MOVE_ARG(ReadHandler) handler);  #if !defined(BOOST_ASIO_NO_IOSTREAM)  /// Start an asynchronous operation to read a certain amount of data at the  /// specified offset.  /**   * This function is used to asynchronously read a certain number of bytes of   * data from a random access device at the specified offset. The function call   * always returns immediately. The asynchronous operation will continue until   * one of the following conditions is true:   *   * @li An error occurred.   *   * This operation is implemented in terms of zero or more calls to the device's   * async_read_some_at function.   *   * @param d The device from which the data is to be read. The type must support   * the AsyncRandomAccessReadDevice concept.   *   * @param offset The offset at which the data will be read.   *   * @param b A basic_streambuf object into which the data will be read. Ownership   * of the streambuf is retained by the caller, which must guarantee that it   * remains valid until the handler is called.   *   * @param handler The handler to be called when the read operation completes.   * Copies will be made of the handler as required. The function signature of the   * handler must be:   * @code void handler(   * // Result of operation.   * const boost::system::error_code& error,   *   * // Number of bytes copied into the buffers. If an error   * // occurred, this will be the number of bytes successfully   * // transferred prior to the error.   * std::size_t bytes_transferred   * ); @endcode   * Regardless of whether the asynchronous operation completes immediately or   * not, the handler will not be invoked from within this function. Invocation of   * the handler will be performed in a manner equivalent to using   * boost::asio::io_service::post().   *   * @note This overload is equivalent to calling:   * @code boost::asio::async_read_at(   * d, 42, b,   * boost::asio::transfer_all(),   * handler); @endcode   */  template  BOOST_ASIO_INITFN_RESULT_TYPE(ReadHandler,   void (boost::system::error_code, std::size_t))  async_read_at(AsyncRandomAccessReadDevice& d, uint64_t offset,   basic_streambuf& b, BOOST_ASIO_MOVE_ARG(ReadHandler) handler);  /// Start an asynchronous operation to read a certain amount of data at the  /// specified offset.  /**   * This function is used to asynchronously read a certain number of bytes of   * data from a random access device at the specified offset. The function call   * always returns immediately. The asynchronous operation will continue until   * one of the following conditions is true:   *   * @li The completion_condition function object returns 0.   *   * This operation is implemented in terms of zero or more calls to the device's   * async_read_some_at function.   *   * @param d The device from which the data is to be read. The type must support   * the AsyncRandomAccessReadDevice concept.   *   * @param offset The offset at which the data will be read.   *   * @param b A basic_streambuf object into which the data will be read. Ownership   * of the streambuf is retained by the caller, which must guarantee that it   * remains valid until the handler is called.   *   * @param completion_condition The function object to be called to determine   * whether the read operation is complete. The signature of the function object   * must be:   * @code std::size_t completion_condition(   * // Result of latest async_read_some_at operation.   * const boost::system::error_code& error,   *   * // Number of bytes transferred so far.   * std::size_t bytes_transferred   * ); @endcode   * A return value of 0 indicates that the read operation is complete. A non-zero   * return value indicates the maximum number of bytes to be read on the next   * call to the device's async_read_some_at function.   *   * @param handler The handler to be called when the read operation completes.   * Copies will be made of the handler as required. The function signature of the   * handler must be:   * @code void handler(   * // Result of operation.   * const boost::system::error_code& error,   *   * // Number of bytes copied into the buffers. If an error   * // occurred, this will be the number of bytes successfully   * // transferred prior to the error.   * std::size_t bytes_transferred   * ); @endcode   * Regardless of whether the asynchronous operation completes immediately or   * not, the handler will not be invoked from within this function. Invocation of   * the handler will be performed in a manner equivalent to using   * boost::asio::io_service::post().   */  template  BOOST_ASIO_INITFN_RESULT_TYPE(ReadHandler,   void (boost::system::error_code, std::size_t))  async_read_at(AsyncRandomAccessReadDevice& d,   uint64_t offset, basic_streambuf& b,   CompletionCondition completion_condition,   BOOST_ASIO_MOVE_ARG(ReadHandler) handler);  #endif // !defined(BOOST_ASIO_NO_IOSTREAM)  /*@}*/  } // namespace asio  } // namespace boost  #include  #include  #endif // BOOST_ASIO_READ_AT_HPP