source: xplra/src/client/c/hu/varadiistvan/xplra/XPlane.h@ 18:c957b01ca44c

// Copyright (c) 2013 by István Váradi

// This file is part of XPLRA, a remote-access plugin for X-Plane

// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:

// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// The views and conclusions contained in the software and documentation are those
// of the authors and should not be interpreted as representing official policies,
// either expressed or implied, of the FreeBSD Project.

#ifndef HU_VARADIISTVAN_XPLRA_XPLANE_H
#define HU_VARADIISTVAN_XPLRA_XPLANE_H
//-----------------------------------------------------------------------------

#include "Exception.h"

#include <hu/varadiistvan/scpl/io/Waiter.h>

#include <inttypes.h>

//-----------------------------------------------------------------------------

namespace hu { namespace varadiistvan { namespace scpl { namespace io {

class LocalClientSocket;
class DataStream;

} /* namespace hu::varadiistvan::scpl::io */ } /* namespace hu::varadiistvan::scpl */ } /* namespace hu::varadiistvan */ } /* namespace hu */

//------------------------------------------------------------------------------

namespace hu { namespace varadiistvan { namespace xplra {

//------------------------------------------------------------------------------

/**
 * The main class to access X-Plane.
 *
 * The calls are synchronous and not thread-safe.
 */
class XPlane
{
private:
    /**
     * The waiter to use.
     */
    scpl::io::Waiter waiter;

    /**
     * The local client socket over which we are communicating with X-Plane.
     */
    scpl::io::LocalClientSocket* socket;

    /**
     * The data stream to handle the data conversions.
     */
    scpl::io::DataStream* stream;

public:
    /**
     * Construct the object. It will not be connected to the simulator
     * yet.
     */
    XPlane() throw();

    /**
     * Destroy the object. If connected, the connection will be
     * closed.
     */
    ~XPlane() throw();

    /**
     * Connect to the simulator.
     */
    void connect() throw(IOException);

    /**
     * Check if we are connected to the simulator.
     */
    bool isConnected() const throw();

    /**
     * Disconnect from the simulator.
     */
    void disconnect() throw();

    /**
     * Get the integer value of the dataref with the given name.
     */
    int getInt(const char* name) throw(Exception);

    /**
     * Get a float value.
     */
    float getFloat(const char* name) throw(Exception);

    /**
     * Get a double value.
     */
    double getDouble(const char* name) throw(Exception);

    /**
     * Get a possibly partial array of floats.
     *
     * @param length the length of the destination buffer
     * @param offset the offset from which to get the array
     *
     * @return the number of values acquired actually
     */
    size_t getFloatArray(const char* name, float* dest,
                         size_t length, size_t offset = 0) throw(Exception);

    /**
     * Get a possibly partial array of floats. The result array will
     * be created with a length needed to hold the returned value.
     *
     * @param offset the offset from which to get the array
     */
    float* getFloatArray(const char* name, size_t& length,
                         size_t offset = 0) throw(Exception);

    /**
     * Get a possibly partial array of integers.
     *
     * @param length the length of the destination buffer
     * @param offset the offset from which to get the array
     *
     * @return the number of values acquired actually
     */
    size_t getIntArray(const char* name, int32_t* dest,
                       size_t length, size_t offset = 0) throw(Exception);

    /**
     * Get a possibly partial array of integers. The result array will
     * be created with a length needed to hold the returned value.
     *
     * @param offset the offset from which to get the array
     */
    int32_t* getIntArray(const char* name, size_t& length,
                         size_t offset = 0) throw(Exception);

    /**
     * Get a possibly partial array of bytes.
     *
     * @param length the length of the destination buffer
     * @param offset the offset from which to get the array
     *
     * @return the number of values acquired actually
     */
    size_t getByteArray(const char* name, uint8_t* dest,
                        size_t length, size_t offset = 0) throw(Exception);

    /**
     * Get a possibly partial array of bytes. The result array will
     * be created with a length needed to hold the returned value.
     *
     * @param offset the offset from which to get the array
     */
    uint8_t* getByteArray(const char* name, size_t& lengyh,
                          size_t offset = 0) throw(Exception);

    /**
     * Get a string. A string is a byte array.
     */
    std::string getString(const char* name, size_t offset = 0) throw(Exception);

    /**
     * Set the given dataref to the given integer value.
     */
    void setInt(const char* name, int value) throw(Exception);

    /**
     * Set the given dataref to the given float value.
     */
    void setFloat(const char* name, float value) throw(Exception);

    /**
     * Set the given dataref to the given double value.
     */
    void setDouble(const char* name, double value) throw(Exception);

    /**
     * Set the given float array to values in the given buffer.
     */
    void setFloatArray(const char* name, const float* values, size_t length,
                       size_t offset = 0) throw(Exception);

    /**
     * Set the given integer array to values in the given buffer.
     */
    void setIntArray(const char* name, const int32_t* values, size_t length,
                     size_t offset = 0) throw(Exception);

    /**
     * Set the given byte array to values in the given buffer.
     */
    void setByteArray(const char* name, const uint8_t* values, size_t length,
                      size_t offset = 0) throw(Exception);

    /**
     * Set the given string to the given value. Since strings are byte
     * arrays, and the bytes after the string should be zeroed, the
     * length must be given. The string will be converted to a byte
     * array of the given length, padded with 0s.
     */
    void setString(const char* name, const char* value, size_t length,
                   size_t offset = 0) throw(Exception);

private:
    /**
     * Check if we have a stream and if it has not failed.
     */
    void checkStream() throw(NotConnectedException, IOException);

    /**
     * Check the given protocol result. If it signifies an error,
     * throw a ProtocolException with the correct error code.
     */
    void checkResult(uint8_t result) throw(ProtocolException);

    /**
     * Read and check the result.  If it signifies an error,
     * throw a ProtocolException with the correct error code.
     */
    void checkResult() throw(ProtocolException);

    /**
     * Issue the command to get a single, scalar value. The result is
     * also checked, but the value should be read by the caller.
     */
    void getScalar(const char* name, uint8_t type) throw(Exception);

    /**
     * Issue the command to get an array of values of the given
     * type. It checks the result and retrieves the number of value
     * items available.
     *
     * @return the number of value items available
     */
    size_t getArray(const char* name, uint8_t type,
                    ssize_t length, size_t offset) throw(Exception);


    /**
     * Issue the command to set a scalar value of the given type.
     */
    void setScalar(const char* name, uint8_t type) throw(Exception);

    /**
     * Issue the command to set an array value of the given type.
     */
    void setArray(const char* name, uint8_t type, size_t length,
                  size_t offset) throw(Exception);
};

//------------------------------------------------------------------------------
// Inline definitions
//------------------------------------------------------------------------------

inline XPlane::XPlane() throw() :
    socket(0),
    stream(0)
{
}

//------------------------------------------------------------------------------

inline bool XPlane::isConnected() const throw()
{
    return socket!=0;
}

//------------------------------------------------------------------------------

} /* namespace hu::varadiistvan::xplra */ } /* namespace hu::varadiistvan */ } /* namespace hu */

//------------------------------------------------------------------------------
#endif // HU_VARADIISTVAN_XPLRA_XPLANE_H

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