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/* 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.
*
* $URL$
* $Id$
*
*/
#if defined(DYNAMIC_MODULES) && defined(_WIN32)
#include "backends/plugins/win32/win32-provider.h"
#include "backends/plugins/dynamic-plugin.h"
#include "common/fs.h"
#include <windows.h>
#define PLUGIN_DIRECTORY ""
#define PLUGIN_PREFIX ""
#define PLUGIN_SUFFIX ".dll"
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;
Common::String _filename;
virtual VoidFunc findSymbol(const char *symbol) {
#ifndef _WIN32_WCE
void *func = (void *)GetProcAddress((HMODULE)_dlHandle, symbol);
#else
void *func = (void *)GetProcAddress((HMODULE)_dlHandle, toUnicode(symbol));
#endif
if (!func)
debug("Failed loading symbol '%s' from plugin '%s'", symbol, _filename.c_str());
// FIXME HACK: This is a HACK to circumvent a clash between the ISO C++
// standard and POSIX: ISO C++ disallows casting between function pointers
// and data pointers, but dlsym always returns a void pointer. For details,
// see e.g. <http://www.trilithium.com/johan/2004/12/problem-with-dlsym/>.
assert(sizeof(VoidFunc) == sizeof(func));
VoidFunc tmp;
memcpy(&tmp, &func, sizeof(VoidFunc));
return tmp;
}
public:
Win32Plugin(const Common::String &filename)
: _dlHandle(0), _filename(filename) {}
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() {
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;
}
}
};
PluginList Win32PluginProvider::getPlugins() {
PluginList pl;
// Load dynamic plugins
// TODO... this is right now just a nasty hack.
// This should search one or multiple directories for all plugins it can
// find (to this end, we maybe should use a special prefix/suffix; e.g.
// instead of libscumm.so, use scumm.engine or scumm.plugin etc.).
//
// The list of directories to search could be e.g.:
// User specified (via config file), ".", "./plugins", "$(prefix)/lib".
//
// We also need to add code which ensures what we are looking at is
// a) a ScummVM engine and b) matches the version of the executable.
// Hence one more symbol should be exported by plugins which returns
// the "ABI" version the plugin was built for, and we can compare that
// to the ABI version of the executable.
// Load all plugins.
// Scan for all plugins in this directory
FilesystemNode dir(PLUGIN_DIRECTORY);
FSList files;
if (!dir.getChildren(files, FilesystemNode::kListFilesOnly)) {
error("Couldn't open plugin directory '%s'", PLUGIN_DIRECTORY);
}
for (FSList::const_iterator i = files.begin(); i != files.end(); ++i) {
Common::String name(i->getName());
if (name.hasPrefix(PLUGIN_PREFIX) && name.hasSuffix(PLUGIN_SUFFIX)) {
pl.push_back(new Win32Plugin(i->getPath()));
}
}
return pl;
}
#endif // defined(DYNAMIC_MODULES) && defined(_WIN32)
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