moIODevicePlugin.cpp

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/*******************************************************************************

                              moIODevicePlugin.cpp

  ****************************************************************************
  *                                                                          *
  *   This source is free software; you can redistribute it and/or modify    *
  *   it under the terms of the GNU General Public License as published by   *
  *   the Free Software Foundation; either version 2 of the License, or      *
  *  (at your option) any later version.                                    *
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  *   This code is distributed in the hope that it will be useful, but       *
  *   WITHOUT ANY WARRANTY; without even the implied warranty of             *
  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU      *
  *   General Public License for more details.                               *
  *                                                                          *
  *   A copy of the GNU General Public License is available on the World     *
  *   Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also       *
  *   obtain it by writing to the Free Software Foundation,                  *
  *   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.         *
  *                                                                          *
  ****************************************************************************

  Copyright(C) 2006 Fabricio Costa

  Authors:
  Fabricio Costa


*******************************************************************************/

#include "moIODevicePlugin.h"

#include "moArray.h"
moDefineDynamicArray(moIODevicePluginsArray)

#include <iostream>
using namespace std;

moIODeviceFactory::~moIODeviceFactory() {
}


//===========================================
//
//                                   moIODevicePlugin
//
//===========================================

void moIODevicePlugin::Load(moText plugin_file)
{
    name = plugin_file;
    handle = moLoadPlugin(plugin_file);

    if(!handle) {
    #if !defined(WIN32)
        cerr << "Cannot open library: " << dlerror() << '\n';
    #else
        CHAR szBuf[80];
        DWORD dw = GetLastError();
        sprintf(szBuf, "%s failed: GetLastError returned %i\n",
            (char*)plugin_file, (int)dw);

    moDebugManager::Error( "moIODevicePlugin::Load > Cannot open library: " + moText(szBuf) );

    #endif
    }

    #if defined(_WIN32)
    FARPROC farp;
    farp = GetProcAddress(handle, "DestroyIODeviceFactory");
    CreateIODeviceFactory = CreateIODeviceFactoryFunction(GetProcAddress(handle, "CreateIODeviceFactory"));
    DestroyIODeviceFactory = DestroyIODeviceFactoryFunction(GetProcAddress(handle, "DestroyIODeviceFactory"));
    #else
    CreateIODeviceFactory = CreateIODeviceFactoryFunction(dlsym(handle, "CreateIODeviceFactory"));
    DestroyIODeviceFactory = DestroyIODeviceFactoryFunction(dlsym(handle, "DestroyIODeviceFactory"));
    #endif

    if(this->CreateIODeviceFactory!=NULL)
        m_factory = this->CreateIODeviceFactory();

}

void moIODevicePlugin::Unload()
{
    this->DestroyIODeviceFactory();

    CreateIODeviceFactory = NULL;
    DestroyIODeviceFactory = NULL;

    moUnloadPlugin(handle);
}


moIODevice* moIODevicePlugin::Create() {

    moIODevice **narray;

    if(m_factory!=NULL) {
        moIODevice *pfx = m_factory->Create();

        if(pfx==NULL) return NULL;

        if(n==0) {//primera vez
            array = new moIODevice* [1];
        } else if(n>0) {//array dinamico
            narray = new moIODevice* [n+1];//generamos el nuevo vacio
            for(int i=0;i<n;i++) narray[i] = array[i];//copiamos el array
            delete [] array;
            array = narray;
        }

        array[n] = pfx;
        n++;
        return pfx;
    }
    return NULL;
}

bool moIODevicePlugin::Destroy(moIODevice *iodevice) {

    moIODevice **narray;
    int i,j;

    if(m_factory!=NULL) {

        for(j=0;j<n;j++)
            if(array[j]==iodevice) {

                m_factory->Destroy(iodevice);

                if(n==1) {//muere
                    delete [] array;
                } else if(n>1) {//array dinamico
                    narray = new moIODevice* [n-1];//generamos el nuevo vacio
                    for(i=0;i<j;i++) narray[i] = array[i];//copiamos el array hasta el j(destruido)
                    for(i=j;i<(n-1);i++) narray[i] = array[i+1];//copiamos el array desde el j
                    delete [] array;
                    array = narray;
                }
                n--;
                return true;
            }
    }
    return false;
}


LIBMOLDEO_API moIODevice* moNewIODevice(moText effect_name, moIODevicePluginsArray &plugins)
{
    // Creando el nombre complete del plugin(incluyendo ruta por defecto)
    // a partir del name del efecto.
    moText complete_name;

    if(!stricmp(effect_name, "nil")) return NULL;

    #if defined(_WIN32)
    complete_name = moText(moDataManager::GetModulesDir()+ "/iodevices/") + (moText)effect_name;
        #ifdef _DEBUG
        complete_name+= moText("_d");
        #endif
    complete_name += moText(".dll");
    #else
    complete_name = moText(moDataManager::GetModulesDir()+ "/iodevices/libmoldeo_") + (moText)effect_name;
        #ifdef _DEBUG
        complete_name+= moText("d");
        #endif
    complete_name += moPluginExtension;
    #endif

    // Indice del plugin que se utilizara para crear a este efecto.
    int plg_index = -1;

    // First, revisa que el plugin ya no haya sido cargado antes.
    for(MOuint i = 0; i < plugins.Count(); i++)
        if(!stricmp(plugins[i]->GetName(), complete_name))
        {
            plg_index = i;
            break;
        }

    if(plg_index == -1)
    {
        // Es la primera vez que se intenta cargar este plugin. Se lo agrega al array.
        // Falta control de errores(que pasa si la libreria no carga, etc?) :-)
        plg_index = plugins.Count();
        moIODevicePlugin *pplugin = new moIODevicePlugin(complete_name);
        plugins.Add( pplugin );
    }

    // El plugin crea al efecto!
    if(plugins[plg_index]->m_factory!=NULL)
    return plugins[plg_index]->Create();
    else return NULL;
}


LIBMOLDEO_API bool moDeleteIODevice(moIODevice *IODevice, moIODevicePluginsArray &plugins)
{
    // Creando el nombre complete del plugin(incluyendo ruta por defecto)
    // a partir del nombre del efecto.
    moText complete_name;

    if( IODevice->GetName() == "") return false;

    #if defined(_WIN32)
    complete_name = moText("plugins/iodevices/") + moText(IODevice->GetName());
        #ifdef _DEBUG
        complete_name+= moText("d");
        #endif
    complete_name += moText(".dll");
    #else
    complete_name = moText("plugins/iodevices/libmoldeo_") + moText(IODevice->GetName());
        #ifdef _DEBUG
        complete_name+= moText("d");
        #endif
    complete_name += moPluginExtension;
    #endif

    // Indice del plugin que se utilizara para crear a este efecto.
    int plg_index = -1;

    // First, revisa que el plugin ya no haya sido cargado antes.
    for(MOuint i = 0; i < plugins.Count(); i++)
        if(!stricmp(plugins[i]->GetName(), complete_name))
        {
            plg_index = i;
            break;
        }

    if(plg_index == -1)
    {
        return false;
    }

    bool res = plugins[plg_index]->Destroy(IODevice);

    if (res && plugins[plg_index]->n == 0) {
        plugins[plg_index]->Unload();
        plugins.Remove(plg_index);

    }

    return res;
}