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win32-provider.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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.

 * This program 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.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

#include "common/scummsys.h"

#if defined(DYNAMIC_MODULES) && defined(_WIN32)

#include "backends/plugins/win32/win32-provider.h"
#include "backends/plugins/dynamic-plugin.h"
#include "common/debug.h"
#include "common/fs.h"

#define WIN32_LEAN_AND_MEAN
#include <windows.h>


class Win32Plugin : public DynamicPlugin {
private:
      static const TCHAR* toUnicode(const char *x) {
      #ifndef _WIN32_WCE
            return (const TCHAR *)x;
      #else
            static TCHAR unicodeString[MAX_PATH];
            MultiByteToWideChar(CP_ACP, 0, x, strlen(x) + 1, unicodeString, sizeof(unicodeString) / sizeof(TCHAR));
            return unicodeString;
      #endif
      }


protected:
      void *_dlHandle;

      virtual VoidFunc findSymbol(const char *symbol) {
            #ifndef _WIN32_WCE
            FARPROC func = GetProcAddress((HMODULE)_dlHandle, symbol);
            #else
            FARPROC func = GetProcAddress((HMODULE)_dlHandle, toUnicode(symbol));
            #endif
            if (!func)
                  debug("Failed loading symbol '%s' from plugin '%s'", symbol, _filename.c_str());

            return (void (*)())func;
      }

public:
      Win32Plugin(const Common::String &filename)
            : DynamicPlugin(filename), _dlHandle(0) {}

      bool loadPlugin() {
            assert(!_dlHandle);
            #ifndef _WIN32_WCE
            _dlHandle = LoadLibrary(_filename.c_str());
            #else
            if (!_filename.hasSuffix("scummvm.dll"))  // skip loading the core scummvm module
                  _dlHandle = LoadLibrary(toUnicode(_filename.c_str()));
            #endif

            if (!_dlHandle) {
                  debug("Failed loading plugin '%s' (error code %d)", _filename.c_str(), (int32) GetLastError());
                  return false;
            } else {
                  debug(1, "Success loading plugin '%s', handle %08X", _filename.c_str(), (uint32) _dlHandle);
            }

            return DynamicPlugin::loadPlugin();
      }

      void unloadPlugin() {
            DynamicPlugin::unloadPlugin();
            if (_dlHandle) {
                  if (!FreeLibrary((HMODULE)_dlHandle))
                        debug("Failed unloading plugin '%s'", _filename.c_str());
                  else
                        debug(1, "Success unloading plugin '%s'", _filename.c_str());
                  _dlHandle = 0;
            }
      }
};


Plugin* Win32PluginProvider::createPlugin(const Common::FSNode &node) const {
      return new Win32Plugin(node.getPath());
}

bool Win32PluginProvider::isPluginFilename(const Common::FSNode &node) const {
      // Check the plugin suffix
      Common::String filename = node.getName();
      if (!filename.hasSuffix(".dll"))
            return false;

      return true;
}


#endif // defined(DYNAMIC_MODULES) && defined(_WIN32)

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