source: xplra/src/client/c/hu/varadiistvan/xplra/xplra.cc@ 40:ec5dde8a6ff6

// 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.

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

#include "xplra.h"

#include "XPlane.h"
#include "MultiGetter.h"
#include "MultiSetter.h"
#include "Exception.h"

#include <vector>
#include <memory>

#include <cstdio>
#include <cassert>

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

using hu::varadiistvan::xplra::XPlane;
using hu::varadiistvan::xplra::MultiBuffer;
using hu::varadiistvan::xplra::MultiGetter;
using hu::varadiistvan::xplra::MultiSetter;
using hu::varadiistvan::xplra::Exception;
using hu::varadiistvan::xplra::IOException;
using hu::varadiistvan::xplra::ProtocolException;
using hu::varadiistvan::xplra::NotConnectedException;
using hu::varadiistvan::xplra::TypeMismatchException;
using hu::varadiistvan::xplra::InvalidIDException;

using std::exception;
using std::string;
using std::vector;
using std::set;
using std::auto_ptr;

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

namespace {

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

/**
 * Template for handling slots.
 */
template <class Value>
struct Slot
{
private:
    /**
     * The slots.
     */
    static std::vector< Slot<Value> > slots;

    /**
     * The index of the first free slot.
     */
    static int firstFree;

public:
    /**
     * Add a new value.
     *
     * @return the ID of the new value
     */
    static int addValue(Value value) throw();

    /**
     * Get the value with the given ID.
     */
    static Value getValue(int valueID) throw();

    /**
     * Clear the value with the given ID.
     */
    static void clearValue(int valueID) throw();

private:
    /**
     * Indicate if the slot contains a valid value or not.
     */
    bool valid;

    union {
        // The value, if the slot contains a value
        Value value;

        // The index of the next free slot
        int nextFreeIndex;
    };

    /**
     * Construct a slot with the given value
     */
    Slot(Value value) throw();

    /**
     * Set the value and return the former next free index. It
     * should be called for a slot with no value.
     */
    int setValue(Value value) throw();

    /**
     * Get the value if this slot contains a value. Otherwise 0 is
     * returned (converted to value).
     */
    Value getValue() const throw();

    /**
     * Clear the value and set the given next free index.
     */
    void clear(int nextFreeIndex) throw();
};

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

template <class Value> vector< Slot<Value> > Slot<Value>::slots;

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

template <class Value> int Slot<Value>::firstFree = -1;

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

template <class Value>
inline Slot<Value>::Slot(Value value) throw() :
    valid(true)
{
    this->value = value;
}

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

template <class Value>
inline int Slot<Value>::setValue(Value value) throw()
{
    assert(!valid);
    int nextFreeIndex = this->nextFreeIndex;
    this->value = value;
    valid = true;
    return nextFreeIndex;
}

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

template <class Value>
inline Value Slot<Value>::getValue() const throw()
{
    return valid ? value : static_cast<Value>(0);
}

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

template <class Value>
inline void Slot<Value>::clear(int nextFreeIndex) throw()
{
    assert(valid);
    valid = false;
    this->nextFreeIndex = nextFreeIndex;
}

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

template <class Value>
int Slot<Value>::addValue(Value value) throw()
{
    int id = firstFree;
    if (id<0) {
        id = slots.size();
        slots.push_back(Slot<Value>(value));
    } else {
        Slot& slot = slots[id];
        firstFree = slot.setValue(value);
    }

    return id;
}

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

template <class Value>
Value Slot<Value>::getValue(int valueID) throw()
{
    size_t index = static_cast<size_t>(valueID);
    return (index<slots.size()) ?
        slots[index].getValue() : static_cast<Value>(0);
}

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

template <class Value>
void Slot<Value>::clearValue(int valueID) throw()
{
    size_t index = static_cast<size_t>(valueID);
    if (index<slots.size()) {
        slots[index].clear(firstFree);
        firstFree = index;
    }
}

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

typedef Slot<MultiBuffer*> MultiBufferSlot;

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

/**
 * Information about a connection.
 */
class Connection : public XPlane
{
private:
    /**
     * Type for the set of multi-dataref buffers belonging to this connection.
     */
    typedef std::set<int> multiBufferIDs_t;

public:
    /**
     * Get the connection for the given multi-dataref buffer.
     */
    static Connection& get(const MultiBuffer& buffer) throw();

private:
    /**
     * The last error code.
     */
    int lastErrorCode;

    /**
     * The last error subcode.
     */
    unsigned long lastErrorSubCode;

    /**
     * The string of the last error
     */
    std::string lastErrorString;

    /**
     * The set of multi-dataref buffers belonging to this connection.
     */
    multiBufferIDs_t multiBufferIDs;

public:
    /**
     * Construct the connection
     */
    Connection() throw();

    /**
     * Destroy the connection.
     */
    ~Connection() throw();

    /**
     * Handle the currently pending exception.
     */
    void handleException() throw();

    /**
     * Get the last error code.
     */
    int getLastError(unsigned long* lastErrorSubCode) const throw();

    /**
     * Get the string representation of the last error code.
     */
    const char* getLastErrorString() const throw();

    /**
     * Clear the last error code.
     */
    void clearLastError() throw();

    /**
     * Create a multi-dataref getter object and register it in a slot.
     *
     * @return the ID of the new getter.
     */
    int createMultiGetter() throw();

    /**
     * Create a multi-dataref setter object and register it in a slot.
     *
     * @return the ID of the new setter.
     */
    int createMultiSetter() throw();

    /**
     * Destroy the multi-dataref buffer with the given ID.
     *
     * @param bufferID the ID of the buffer. It should be a valid ID,
     * that belongs to this connection.
     *
     * @return whether the buffer was found and could be destroyed.
     */
    bool destroyMultiBuffer(int bufferID) throw(Exception);
};

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

inline Connection& Connection::get(const MultiBuffer& buffer) throw()
{
    return static_cast<Connection&>(buffer.getXPlane());
}

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

inline Connection::Connection() throw() :
    lastErrorCode(0),
    lastErrorSubCode(0)
{
}

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

Connection::~Connection() throw()
{
    for(multiBufferIDs_t::iterator i = multiBufferIDs.begin();
        i!=multiBufferIDs.end(); ++i)
    {
        MultiBufferSlot::clearValue(*i);
    }
}

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

void Connection::handleException() throw()
{
    try {
        throw;
    } catch(const IOException& e) {
        lastErrorCode = ERROR_IO;
        lastErrorSubCode = e.getErrorCode();
        lastErrorString = e.what();
    } catch(const ProtocolException& e) {
        lastErrorCode = ERROR_PROTOCOL;
        lastErrorSubCode = static_cast<unsigned long>(e.getErrorCode());
        lastErrorString = e.what();
    } catch(const NotConnectedException& e) {
        lastErrorCode = ERROR_NOT_CONNECTED;
        lastErrorSubCode = 0;
        lastErrorString = e.what();
    } catch(const TypeMismatchException& e) {
        lastErrorCode = ERROR_TYPE_MISMATCH;
        lastErrorSubCode = 0;
        lastErrorString = e.what();
    } catch(const InvalidIDException& e) {
        lastErrorCode = ERROR_INVALID_ID;
        lastErrorSubCode = 0;
        lastErrorString = e.what();
    } catch(const exception& e) {
        lastErrorCode = ERROR_OTHER;
        lastErrorSubCode = 0;
        lastErrorString = e.what();
    } catch(...) {
        lastErrorCode = ERROR_OTHER;
        lastErrorSubCode = 0;
        lastErrorString = "<Exception of an unknown type>";
    }
}

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

inline int Connection::getLastError(unsigned long* lastErrorSubCode)
    const throw()
{
    if (lastErrorSubCode!=0) *lastErrorSubCode = this->lastErrorSubCode;
    return lastErrorCode;
}

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

inline const char* Connection::getLastErrorString() const throw()
{
    return (lastErrorCode==ERROR_NONE) ? 0 : lastErrorString.c_str();
}

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

inline void Connection::clearLastError() throw()
{
    lastErrorCode = ERROR_NONE;
    lastErrorSubCode = 0;
    lastErrorString.clear();
}

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

inline int Connection::createMultiGetter() throw()
{
    MultiGetter& getter = XPlane::createMultiGetter();
    return MultiBufferSlot::addValue(&getter);
}

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

inline int Connection::createMultiSetter() throw()
{
    MultiSetter& setter = XPlane::createMultiSetter();
    return MultiBufferSlot::addValue(&setter);
}

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

bool Connection::destroyMultiBuffer(int bufferID) throw(Exception)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return false;

    if (XPlane::destroyMultiBuffer(*buffer)) {
        multiBufferIDs.erase(bufferID);
        MultiBufferSlot::clearValue(bufferID);
        return true;
    } else {
        return false;
    }
}

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

/**
 * Slot for connections.
 */
typedef Slot<Connection*> ConnectionSlot;

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

} /* anonymous namespace */

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

extern "C" int xplra_get_last_error(int connectionID, unsigned long* subCode)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    return (connection==0) ? -1 : connection->getLastError(subCode);
}

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

extern "C" const char* xplra_get_last_error_string(int connectionID)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    return (connection==0) ? 0 : connection->getLastErrorString();
}

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

extern "C" void xplra_clear_last_error(int connectionID)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection!=0) connection->clearLastError();
}

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

extern "C" int xplra_connect()
{
    try {
        auto_ptr<Connection> connection(new Connection());
        connection->connect();
        return ConnectionSlot::addValue(connection.release());
    } catch(...) {
        return -1;
    }
}

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

extern "C"int xplra_get_versions(int connectionID,
                                 int* xplaneVersion, int* xplmVersion,
                                 int* xplraVersion)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return -1;
    try {
        connection->getVersions(*xplaneVersion, *xplmVersion, *xplraVersion);
        return 0;
    } catch (...) {
        connection->handleException();
        return -1;
    }
}

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

extern "C" int xplra_reload_plugins(int connectionID)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return -1;
    try {
        connection->reloadPlugins();
        return 0;
    } catch (...) {
        connection->handleException();
        return -1;
    }
}

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

extern "C" int xplra_get_int(int* value, int connectionID, const char* name)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return -1;
    try {
        *value = connection->getInt(name);
        return 0;
    } catch (...) {
        connection->handleException();
        return -1;
    }
}

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

extern "C" int xplra_get_float(float* value, int connectionID, const char* name)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return -1;
    try {
        *value = connection->getFloat(name);
        return 0;
    } catch (...) {
        connection->handleException();
        return -1;
    }
}

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

extern "C" int xplra_get_double(double* value,
                                int connectionID, const char* name)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return -1;
    try {
        *value = connection->getDouble(name);
        return 0;
    } catch (...) {
        connection->handleException();
        return -1;
    }
}

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

extern "C" ssize_t xplra_get_float_array(float* dest, size_t length, size_t offset,
                                         int connectionID, const char* name)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return -1;
    try {
        return connection->getFloatArray(name, dest, length, offset);
    } catch (...) {
        connection->handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C" float* xplra_get_float_array_new(size_t* length, size_t offset,
                                            int connectionID, const char* name)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return 0;
    try {
        return connection->getFloatArray(name, *length, offset);
    } catch (...) {
        connection->handleException();
        return 0;
    }
}

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

extern "C" ssize_t xplra_get_int_array(int32_t* dest, size_t length, size_t offset,
                                       int connectionID, const char* name)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return -1;
    try {
        return connection->getIntArray(name, dest, length, offset);
    } catch (...) {
        connection->handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C" int32_t* xplra_get_int_array_new(size_t* length, size_t offset,
                                            int connectionID, const char* name)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return 0;
    try {
        return connection->getIntArray(name, *length, offset);
    } catch (...) {
        connection->handleException();
        return 0;
    }
}

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

extern "C" ssize_t xplra_get_byte_array(void* dest, size_t length, size_t offset,
                                        int connectionID, const char* name)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return -1;
    try {
        return connection->getByteArray(name, reinterpret_cast<uint8_t*>(dest),
                                        length, offset);
    } catch (...) {
        connection->handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C" uint8_t* xplra_get_byte_array_new(size_t* length, size_t offset,
                                             int connectionID, const char* name)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return 0;
    try {
        return connection->getByteArray(name, *length, offset);
    } catch (...) {
        connection->handleException();
        return 0;
    }
}

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

extern "C" int xplra_set_int(int connectionID, const char* name, int value)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return 0;
    try {
        connection->setInt(name, value);
        return 0;
    } catch (...) {
        connection->handleException();
        return -1;
    }
}

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

extern "C" int xplra_set_float(int connectionID, const char* name, float value)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return 0;
    try {
        connection->setFloat(name, value);
        return 0;
    } catch (...) {
        connection->handleException();
        return -1;
    }
}

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

extern "C" int xplra_set_double(int connectionID, const char* name,
                                double value)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return 0;
    try {
        connection->setDouble(name, value);
        return 0;
    } catch (...) {
        connection->handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C" int xplra_set_float_array(int connectionID, const char* name,
                                     const float* values,
                                     size_t length, size_t offset)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return 0;
    try {
        connection->setFloatArray(name, values, length, offset);
        return 0;
    } catch (...) {
        connection->handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C" int xplra_set_int_array(int connectionID, const char* name,
                                   const int32_t* values,
                                   size_t length, size_t offset)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return 0;
    try {
        connection->setIntArray(name, values, length, offset);
        return 0;
    } catch (...) {
        connection->handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C" int xplra_set_byte_array(int connectionID, const char* name,
                                    const void* values,
                                    size_t length, size_t offset)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return 0;
    try {
        connection->setByteArray(name, reinterpret_cast<const uint8_t*>(values),
                                 length, offset);
        return 0;
    } catch (...) {
        connection->handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C" int xplra_set_string(int connectionID, const char* name,
                                const char* value,
                                size_t length, size_t offset)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return 0;
    try {
        connection->setString(name, value, length, offset);
        return 0;
    } catch (...) {
        connection->handleException();
        return -1;
    }
}

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

extern "C" int xplra_multi_create_getter(int connectionID)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    return (connection==0) ? -1 : connection->createMultiGetter();
}

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

extern "C" int xplra_multi_create_setter(int connectionID)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    return (connection==0) ? -1 : connection->createMultiSetter();
}

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

extern "C" size_t xplra_multi_add_int(int bufferID, const char* name)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    return (buffer==0) ? INVALID_DATAREF_ID : buffer->addInt(name);
}

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

extern "C" size_t xplra_multi_add_float(int bufferID, const char* name)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    return (buffer==0) ? INVALID_DATAREF_ID : buffer->addFloat(name);
}

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

extern "C" size_t xplra_multi_add_double(int bufferID, const char* name)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    return (buffer==0) ? INVALID_DATAREF_ID : buffer->addDouble(name);
}

/*----------------------------------------------------------------------------*/

extern "C" size_t xplra_multi_add_float_array(int bufferID, const char* name,
                                              size_t length, size_t offset)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    return (buffer==0) ?
        INVALID_DATAREF_ID : buffer->addFloatArray(name, length, offset);
}

/*----------------------------------------------------------------------------*/

extern "C" size_t xplra_multi_add_int_array(int bufferID, const char* name,
                                            size_t length, size_t offset)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    return (buffer==0) ?
        INVALID_DATAREF_ID : buffer->addIntArray(name, length, offset);
}

/*----------------------------------------------------------------------------*/

extern "C" size_t xplra_multi_add_byte_array(int bufferID, const char* name,
                                             size_t length, size_t offset)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    return (buffer==0) ?
        INVALID_DATAREF_ID : buffer->addByteArray(name, length, offset);
}

/*----------------------------------------------------------------------------*/

extern "C" int xplra_multi_finalize(int bufferID)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    return (buffer==0) ? -1 : (buffer->finalize() ? 1 : 0);
}

/*----------------------------------------------------------------------------*/

extern "C" int xplra_multi_register(int bufferID)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return -1;
    try {
        buffer->registerInXPlane();
        return 0;
    } catch (...) {
        Connection::get(*buffer).handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C" int xplra_multi_unregister(int bufferID)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return -1;
    try {
        buffer->unregisterFromXPlane();
        return 0;
    } catch (...) {
        Connection::get(*buffer).handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C" int xplra_multi_execute(int bufferID)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return -1;
    try {
        buffer->execute();
        return 0;
    } catch (...) {
        Connection::get(*buffer).handleException();
        return -1;
    }
}

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

extern "C" int xplra_multi_set_int(int bufferID, size_t datarefID, int value)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return -1;
    try {
        buffer->setInt(datarefID, value);
        return 0;
    } catch (...) {
        Connection::get(*buffer).handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C" int xplra_multi_get_int(int* dest, int bufferID, size_t datarefID)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return -1;
    try {
        *dest = buffer->getInt(datarefID);
        return 0;
    } catch (...) {
        Connection::get(*buffer).handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C"
const int32_t* xplra_multi_get_int_const_ptr(int bufferID, size_t datarefID)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return 0;
    try {
        return &(buffer->getIntRef(datarefID));
    } catch (...) {
        Connection::get(*buffer).handleException();
        return 0;
    }
}

/*----------------------------------------------------------------------------*/

extern "C"
int32_t* xplra_multi_get_int_ptr(int bufferID, size_t datarefID)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return 0;
    try {
        return &(buffer->getIntRef(datarefID));
    } catch (...) {
        Connection::get(*buffer).handleException();
        return 0;
    }
}

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

extern "C"
int xplra_multi_set_float(int bufferID, size_t datarefID, float value)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return -1;
    try {
        buffer->setFloat(datarefID, value);
        return 0;
    } catch (...) {
        Connection::get(*buffer).handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C"
int xplra_multi_get_float(float* dest, int bufferID, size_t datarefID)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return -1;
    try {
        *dest = buffer->getFloat(datarefID);
        return 0;
    } catch (...) {
        Connection::get(*buffer).handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C"
const float* xplra_multi_get_float_const_ptr(int bufferID, size_t datarefID)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return 0;
    try {
        return &(buffer->getFloatRef(datarefID));
    } catch (...) {
        Connection::get(*buffer).handleException();
        return 0;
    }
}

/*----------------------------------------------------------------------------*/

extern "C"
float* xplra_multi_get_float_ptr(int bufferID, size_t datarefID)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return 0;
    try {
        return &(buffer->getFloatRef(datarefID));
    } catch (...) {
        Connection::get(*buffer).handleException();
        return 0;
    }
}

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

extern "C"
int xplra_multi_set_double(int bufferID, size_t datarefID, double value)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return -1;
    try {
        buffer->setDouble(datarefID, value);
        return 0;
    } catch (...) {
        Connection::get(*buffer).handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C"
int xplra_multi_get_double(double* dest, int bufferID, size_t datarefID)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return -1;
    try {
        *dest = buffer->getDouble(datarefID);
        return 0;
    } catch (...) {
        Connection::get(*buffer).handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C"
const double* xplra_multi_get_double_const_ptr(int bufferID, size_t datarefID)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return 0;
    try {
        return &(buffer->getDoubleRef(datarefID));
    } catch (...) {
        Connection::get(*buffer).handleException();
        return 0;
    }
}

/*----------------------------------------------------------------------------*/

extern "C"
double* xplra_multi_get_double_ptr(int bufferID, size_t datarefID)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return 0;
    try {
        return &(buffer->getDoubleRef(datarefID));
    } catch (...) {
        Connection::get(*buffer).handleException();
        return 0;
    }
}

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

extern "C"
ssize_t xplra_multi_set_float_array(int bufferID, size_t datarefID,
                                    const float* value, size_t length,
                                    size_t offset)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return -1;
    try {
        return buffer->setFloatArray(datarefID, value, length, offset);
    } catch (...) {
        Connection::get(*buffer).handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C"
ssize_t xplra_multi_get_float_array(float* value,
                                    size_t length, size_t offset,
                                    int bufferID, size_t datarefID)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return -1;
    try {
        return buffer->getFloatArray(datarefID, value, length, offset);
    } catch (...) {
        Connection::get(*buffer).handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C"
const float* xplra_multi_get_float_array_ptr(int bufferID, size_t datarefID,
                                             size_t offset)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return 0;
    try {
        return buffer->getFloatArray(datarefID, offset);
    } catch (...) {
        Connection::get(*buffer).handleException();
        return 0;
    }
}

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

extern "C"
ssize_t xplra_multi_set_int_array(int bufferID, size_t datarefID,
                                  const int32_t* value, size_t length,
                                  size_t offset)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return -1;
    try {
        return buffer->setIntArray(datarefID, value, length, offset);
    } catch (...) {
        Connection::get(*buffer).handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C"
ssize_t xplra_multi_get_int_array(int32_t* value,
                                  size_t length, size_t offset,
                                  int bufferID, size_t datarefID)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return -1;
    try {
        return buffer->getIntArray(datarefID, value, length, offset);
    } catch (...) {
        Connection::get(*buffer).handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C"
const int32_t* xplra_multi_get_int_array_ptr(int bufferID, size_t datarefID,
                                             size_t offset)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return 0;
    try {
        return buffer->getIntArray(datarefID, offset);
    } catch (...) {
        Connection::get(*buffer).handleException();
        return 0;
    }
}

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

extern "C"
ssize_t xplra_multi_set_byte_array(int bufferID, size_t datarefID,
                                   const void* value, size_t length,
                                   size_t offset)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return -1;
    try {
        return buffer->setByteArray(datarefID,
                                    reinterpret_cast<const uint8_t*>(value),
                                    length, offset);
    } catch (...) {
        Connection::get(*buffer).handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C"
ssize_t xplra_multi_get_byte_array(void* value,
                                   size_t length, size_t offset,
                                   int bufferID, size_t datarefID)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return -1;
    try {
        return buffer->getByteArray(datarefID,
                                    reinterpret_cast<uint8_t*>(value),
                                    length, offset);
    } catch (...) {
        Connection::get(*buffer).handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C"
const uint8_t* xplra_multi_get_byte_array_ptr(int bufferID, size_t datarefID,
                                              size_t offset)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return 0;
    try {
        return buffer->getByteArray(datarefID, offset);
    } catch (...) {
        Connection::get(*buffer).handleException();
        return 0;
    }
}

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

extern "C" ssize_t xplra_multi_set_string(int bufferID, size_t datarefID,
                                          const char* value, size_t offset)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return -1;
    try {
        return buffer->setString(datarefID, value, offset);
    } catch (...) {
        Connection::get(*buffer).handleException();
        return -1;
    }
}

/*----------------------------------------------------------------------------*/

extern "C"
const char* xplra_multi_get_string_ptr(int bufferID, size_t datarefID,
                                       size_t offset)
{
    MultiBuffer* buffer = MultiBufferSlot::getValue(bufferID);
    if (buffer==0) return 0;
    try {
        return buffer->getStringPtr(datarefID, offset);
    } catch (...) {
        Connection::get(*buffer).handleException();
        return 0;
    }
}

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

extern "C" int xplra_multi_destroy_buffer(int connectionID, int bufferID)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return -1;

    try {
        return connection->destroyMultiBuffer(bufferID) ? 0 : -1;
    } catch(...) {
        connection->handleException();
        return -1;
    }
}

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

extern "C" int xplra_show_message(int connectionID,
                                  const char* message, float duration)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return -1;

    try {
        connection->showMessage(message, duration);
        return 0;
    } catch(...) {
        connection->handleException();
        return -1;
    }
}

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

extern "C" int xplra_disconnect(int connectionID)
{
    Connection* connection = ConnectionSlot::getValue(connectionID);
    if (connection==0) return -1;

    ConnectionSlot::clearValue(connectionID);
    connection->disconnect();
    delete connection;

    return 0;
}

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

// Local Variables:
// mode: C++
// c-basic-offset: 4
// indent-tabs-mode: nil
// End: