136 lines
3.8 KiB
C++
136 lines
3.8 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#if defined(DYNAMIC_MODULES) && defined(ELF_LOADER_TARGET)
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#include "backends/plugins/elf-provider.h"
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#include "backends/plugins/dynamic-plugin.h"
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#include "common/fs.h"
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#include "backends/plugins/elf-loader.h"
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class ELFPlugin : public DynamicPlugin {
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protected:
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DLObject *_dlHandle;
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Common::String _filename;
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virtual VoidFunc findSymbol(const char *symbol) {
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void *func;
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bool handleNull;
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if (_dlHandle == NULL) {
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func = NULL;
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handleNull = true;
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} else {
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func = _dlHandle->symbol(symbol);
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}
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if (!func) {
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if (handleNull) {
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warning("Failed loading symbol '%s' from plugin '%s' (Handle is NULL)", symbol, _filename.c_str());
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} else {
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warning("Failed loading symbol '%s' from plugin '%s'", symbol, _filename.c_str());
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}
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}
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// FIXME HACK: This is a HACK to circumvent a clash between the ISO C++
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// standard and POSIX: ISO C++ disallows casting between function pointers
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// and data pointers, but dlsym always returns a void pointer. For details,
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// see e.g. <http://www.trilithium.com/johan/2004/12/problem-with-dlsym/>.
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assert(sizeof(VoidFunc) == sizeof(func));
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VoidFunc tmp;
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memcpy(&tmp, &func, sizeof(VoidFunc));
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return tmp;
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}
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public:
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ELFPlugin(const Common::String &filename)
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: _dlHandle(0), _filename(filename) {}
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~ELFPlugin() {
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if (_dlHandle)
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unloadPlugin();
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}
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bool loadPlugin() {
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assert(!_dlHandle);
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DLObject *obj = new DLObject(NULL);
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if (obj->open(_filename.c_str())) {
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_dlHandle = obj;
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} else {
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delete obj;
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_dlHandle = NULL;
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}
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if (!_dlHandle) {
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warning("Failed loading plugin '%s'", _filename.c_str());
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return false;
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}
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bool ret = DynamicPlugin::loadPlugin();
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if (ret && _dlHandle) {
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_dlHandle->discard_symtab();
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}
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return ret;
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}
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void unloadPlugin() {
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DynamicPlugin::unloadPlugin();
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if (_dlHandle) {
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if (_dlHandle == NULL) {
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// FIXME: This check makes no sense, _dlHandle cannot be NULL at this point
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warning("Failed unloading plugin '%s' (Handle is NULL)", _filename.c_str());
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} else if (_dlHandle->close()) {
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delete _dlHandle;
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} else {
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warning("Failed unloading plugin '%s'", _filename.c_str());
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// FIXME: We are leaking _dlHandle here!
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// Any particular reasons why we would want to do that???
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}
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_dlHandle = 0;
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}
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}
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};
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Plugin* ELFPluginProvider::createPlugin(const Common::FSNode &node) const {
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return new ELFPlugin(node.getPath());
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}
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bool ELFPluginProvider::isPluginFilename(const Common::FSNode &node) const {
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// Check the plugin suffix
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// FIXME: Do we need these printfs? Should get rid of them eventually.
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Common::String filename = node.getName();
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printf("Testing name %s", filename.c_str());
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if (!filename.hasSuffix(".PLG") && !filename.hasSuffix(".plg") && !filename.hasSuffix(".PLUGIN") && !filename.hasSuffix(".plugin")) {
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printf(" fail.\n");
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return false;
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}
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printf(" success!\n");
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return true;
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}
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#endif // defined(DYNAMIC_MODULES) && defined(ELF_LOADER_TARGET)
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