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#include "tpluginmanager.h"
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#include "tsystem.h"
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#include "tconvert.h"
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#include "tlogger.h"
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#ifdef _WIN32
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#include <windows.h></windows.h>
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#else
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// QUALE DI QUESTI SERVE VERAMENTE??
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#include <grp.h></grp.h>
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#include <utime.h></utime.h>
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#include <sys param.h=""></sys>
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#include <unistd.h></unistd.h>
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#include <sys types.h=""></sys>
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#include <sys timeb.h="">  // for ftime</sys>
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#include <stdio.h></stdio.h>
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#include <unistd.h></unistd.h>
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#include <dirent.h></dirent.h>
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#include <sys dir.h=""></sys>
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#include <sys param.h="">  // for getfsstat</sys>
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#ifdef MACOSX
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#include <sys ucred.h=""></sys>
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#endif
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#include <sys mount.h=""></sys>
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#include <pwd.h></pwd.h>
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#include <dlfcn.h></dlfcn.h>
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#endif
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//-----------------------------------------------------------------------------
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class TPluginManager::Plugin {
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public:
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#ifdef _WIN32
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  typedef HINSTANCE Handle;
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#else
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  typedef void *Handle;
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#endif
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private:
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  Handle m_handle;
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  TPluginInfo m_info;
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public:
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  Plugin(Handle handle) : m_handle(handle) {}
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  Handle getHandle() const { return m_handle; }
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  const TPluginInfo &getInfo() const { return m_info; }
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  void setInfo(const TPluginInfo &info) { m_info = info; }
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  std::string getName() const { return m_info.getName(); }
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};
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//-----------------------------------------------------------------------------
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typedef const TPluginInfo *TnzLibMainProcType();
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//--------------------------------------------------------------
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namespace {
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const char *TnzLibMainProcName = "TLibMain";
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#if !defined(_WIN32)
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const char *TnzLibMainProcName2 = "_TLibMain";
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#endif
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}
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//=============================================================================
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TPluginManager::TPluginManager() { m_ignoreList.insert("tnzimagevector"); }
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//-----------------------------------------------------------------------------
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TPluginManager::~TPluginManager() {
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  //   try { unloadPlugins(); } catch(...) {}
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}
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//-----------------------------------------------------------------------------
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TPluginManager *TPluginManager::instance() {
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  static TPluginManager _instance;
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  return &_instance;
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}
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//-----------------------------------------------------------------------------
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bool TPluginManager::isIgnored(std::string name) const {
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  return m_ignoreList.count(toLower(name)) > 0;
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}
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//-----------------------------------------------------------------------------
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void TPluginManager::unloadPlugins() {
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  for (PluginTable::iterator it = m_pluginTable.begin();
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       it != m_pluginTable.end(); ++it) {
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    Plugin::Handle handle = (*it)->getHandle();
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#ifndef LINUX
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#ifdef _WIN32
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    FreeLibrary(handle);
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#else
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    dlclose(handle);
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#endif
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#endif
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    delete (*it);
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  }
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  m_pluginTable.clear();
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}
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//--------------------------------------------------------------
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void TPluginManager::loadPlugin(const TFilePath &fp) {
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  if ((int)m_loadedPlugins.count(fp) > 0) {
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    TLogger::debug() << "Already loaded " << fp;
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    return;
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  }
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  std::string name = fp.getName();
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  if (isIgnored(name)) {
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    TLogger::debug() << "Ignored " << fp;
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    return;
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  }
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  TLogger::debug() << "Loading " << fp;
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#ifdef _WIN32
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  Plugin::Handle handle = LoadLibraryW(fp.getWideString().c_str());
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#else
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  Plugin::Handle handle =
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      dlopen(::to_string(fp).c_str(), RTLD_NOW);  // RTLD_LAZY
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#endif
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  if (!handle) {
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    // non riesce a caricare la libreria;
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    TLogger::warning() << "Unable to load " << fp;
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#ifdef _WIN32
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    std::wstring getFormattedMessage(DWORD lastError);
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    TLogger::warning() << ::to_string(getFormattedMessage(GetLastError()));
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#else
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    TLogger::warning() << dlerror();
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#endif
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  } else {
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    m_loadedPlugins.insert(fp);
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    Plugin *plugin = new Plugin(handle);
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    m_pluginTable.push_back(plugin);
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    // cout << "loaded" << endl;
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    TnzLibMainProcType *tnzLibMain = 0;
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#ifdef _WIN32
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    tnzLibMain =
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        (TnzLibMainProcType *)GetProcAddress(handle, TnzLibMainProcName);
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#else
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    tnzLibMain = (TnzLibMainProcType *)dlsym(handle, TnzLibMainProcName);
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    if (!tnzLibMain)  // provo _ come prefisso
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      tnzLibMain = (TnzLibMainProcType *)dlsym(handle, TnzLibMainProcName2);
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#endif
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    if (!tnzLibMain) {
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      // La libreria non esporta TLibMain;
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      TLogger::warning() << "Corrupted " << fp;
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#ifdef _WIN32
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      FreeLibrary(handle);
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#else
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      dlclose(handle);
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#endif
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    } else {
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      const TPluginInfo *info = tnzLibMain();
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      if (info) plugin->setInfo(*info);
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    }
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  }
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}
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//--------------------------------------------------------------
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void TPluginManager::loadPlugins(const TFilePath &dir) {
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#if defined(_WIN32)
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  const std::string extension = "dll";
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#elif defined(LINUX) || defined(__sgi)
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  const std::string extension = "so";
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#elif defined(MACOSX)
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  const std::string extension = "dylib";
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#endif
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  TFilePathSet dirContent = TSystem::readDirectory(dir, false);
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  if (dirContent.empty()) return;
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  for (TFilePathSet::iterator it = dirContent.begin(); it != dirContent.end();
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       it++) {
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    TFilePath fp = *it;
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    if (fp.getType() != extension) continue;
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    std::wstring fullpath = fp.getWideString();
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#ifdef _WIN32
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    bool isDebugLibrary =
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        (fullpath.find(L".d.") == fullpath.size() - (extension.size() + 3));
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#ifdef _DEBUG
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    if (!isDebugLibrary)
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#else
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    if (isDebugLibrary)
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#endif
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      continue;
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#endif
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    try {
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      loadPlugin(fp);
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    } catch (...) {
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      TLogger::warning() << "unexpected error loading " << fp;
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    }
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  }
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}
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//--------------------------------------------------------------
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void TPluginManager::loadStandardPlugins() {
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  TFilePath pluginsDir = TSystem::getDllDir() + "plugins";
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  // loadPlugins(pluginsDir + "io");
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  loadPlugins(pluginsDir + "fx");
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}
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//--------------------------------------------------------------
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void TPluginManager::setIgnoredList(const std::set<std::string> &names) {</std::string>
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  m_ignoreList.clear();
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  for (std::set<std::string>::const_iterator it = names.begin();</std::string>
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       it != names.end(); ++it)
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    m_ignoreList.insert(toLower(*it));
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}