source: orxonox.OLD/trunk/src/util/loading/resource_manager.cc @ 6428

/*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   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, or (at your option)
   any later version.

   ### File Specific:
   main-programmer: Benjamin Grauer
   co-programmer: Patrick Boenzli
*/

#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_LOAD

#include "resource_manager.h"

#include "debug.h"

#include <algorithm>

// different resource Types
#ifndef NO_MODEL
#include "objModel.h"
#include "primitive_model.h"
#include "md2Model.h"
#endif /* NO_MODEL */
#ifndef NO_TEXTURES
#include "texture.h"
#endif /* NO_TEXTURES */
#ifndef NO_TEXT
#include "font.h"
#endif /* NO_TEXT */
#ifndef NO_AUDIO
#include "sound_buffer.h"
#include "ogg_player.h"
#endif /* NO_AUDIO */
#ifndef NO_SHADERS
#include "shader.h"
#endif /* NO_SHADERS */

// File Handling Includes
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

using namespace std;

/**
 *  standard constructor
*/
ResourceManager::ResourceManager ()
{
  this->setClassID(CL_RESOURCE_MANAGER, "ResourceManager");
  this->setName("ResourceManager");

  this->dataDir = new char[3];
  strcpy(this->dataDir, "./");
  this->tryDataDir("./data");
}

//! Singleton Reference to the ResourceManager
ResourceManager* ResourceManager::singletonRef = NULL;

/**
 *  standard destructor
*/
ResourceManager::~ResourceManager ()
{
  // deleting the Resources-List
  this->unloadAllByPriority(RP_GAME);

  if (!this->resourceList.empty())
    PRINTF(1)("Not removed all Resources, since there are still %d resources registered\n", this->resourceList.size());

  // deleting the Directorie Lists
  while (!this->imageDirs.empty())
    {
      delete[] this->imageDirs.front();
      this->imageDirs.pop_front();
    }

  delete[] this->dataDir;

  ResourceManager::singletonRef = NULL;
}

/**
 *  sets the data main directory
 * @param dataDir the DataDirectory.
 */
bool ResourceManager::setDataDir(const char* dataDir)
{
  char* realDir = ResourceManager::homeDirCheck(dataDir);
  if (isDir(realDir))
  {
    delete[] this->dataDir;
    if (dataDir[strlen(dataDir)-1] == '/' || dataDir[strlen(dataDir)-1] == '\\')
    {
      this->dataDir = new char[strlen(realDir)+1];
      strcpy(this->dataDir, realDir);
    }
    else
    {
      this->dataDir = new char[strlen(realDir)+2];
      strcpy(this->dataDir, realDir);
      this->dataDir[strlen(realDir)] = '/';
      this->dataDir[strlen(realDir)+1] = '\0';
    }
    delete[] realDir;
    return true;
  }
  else
  {
    PRINTF(1)("%s is not a Directory, and can not be the Data Directory, leaving as %s \n", realDir, this->dataDir);
    delete[] realDir;
    return false;
  }
}

/**
 * sets the data main directory
 * @param dataDir the DataDirectory.
 *
 * this is essentially the same as setDataDir, but it ommits the error-message
 */
bool ResourceManager::tryDataDir(const char* dataDir)
{
  char* realDir = ResourceManager::homeDirCheck(dataDir);
  if (isDir(realDir))
  {
    delete[] this->dataDir;
    if (dataDir[strlen(dataDir)-1] == '/' || dataDir[strlen(dataDir)-1] == '\\')
    {
      this->dataDir = new char[strlen(realDir)+1];
      strcpy(this->dataDir, realDir);
    }
    else
    {
      this->dataDir = new char[strlen(realDir)+2];
      strcpy(this->dataDir, realDir);
      this->dataDir[strlen(realDir)] = '/';
      this->dataDir[strlen(realDir)+1] = '\0';
    }
    delete[] realDir;
    return true;
  }
  delete[] realDir;
  return false;
}



/**
 * checks for the DataDirectory, by looking if
 * @param fileInside is iniside of the given directory.
*/
bool ResourceManager::verifyDataDir(const char* fileInside)
{
  bool retVal;
  if (!isDir(this->dataDir))
    {
      PRINTF(1)("%s is not a directory\n", this->dataDir);
      return false;
    }

  char* testFile = new char[strlen(this->dataDir)+strlen(fileInside)+1];
  sprintf(testFile, "%s%s", this->dataDir, fileInside);
  retVal = isFile(testFile);
  delete[] testFile;
  return retVal;
}

#ifndef NO_TEXTURES
/**
 *  adds a new Path for Images
 * @param imageDir The path to insert
 * @returns true, if the Path was well and injected (or already existent within the list)
   false otherwise
*/
bool ResourceManager::addImageDir(const char* imageDir)
{
  if (imageDir == NULL)
    return false;

  char* newDir;
  if (imageDir[strlen(imageDir)-1] == '/' || imageDir[strlen(imageDir)-1] == '\\')
  {
    newDir = new char[strlen(imageDir)+1];
    strcpy(newDir, imageDir);
  }
  else
  {
    newDir = new char[strlen(imageDir)+2];
    strcpy(newDir, imageDir);
    newDir[strlen(imageDir)] = '/';
    newDir[strlen(imageDir)+1] = '\0';
  }
  // check if the param is a Directory
  if (isDir(newDir))
    {
      // check if the Directory has been added before
      std::list<char*>::const_iterator imageDir;
      for (imageDir = this->imageDirs.begin(); imageDir != this->imageDirs.end(); imageDir++)
      {
         if (!strcmp(*imageDir, newDir))
         {
           PRINTF(3)("Path %s already loaded\n", newDir);
           delete[] newDir;
           return true;
         }
      }
      // adding the directory to the List
      this->imageDirs.push_back(newDir);
      return true;
    }
  else
    {
      PRINTF(1)("%s is not a Directory, and can not be added to the Paths of Images\n", newDir);
      delete[] newDir;
      return false;
    }
}
#endif /* NO_TEXTURES */

/**
 *  loads resources
 * @param fileName: The fileName of the resource to load
 * @param prio: The ResourcePriority of this resource (will only be increased)
 * @param param1: an additional option to parse (see the constuctors for more help)
 * @param param2: an additional option to parse (see the constuctors for more help)
 * @param param3: an additional option to parse (see the constuctors for more help)
 * @returns a pointer to a desired Resource.
*/
BaseObject* ResourceManager::load(const char* fileName, ResourcePriority prio, void* param1, void* param2, void* param3)
{
  if (fileName == NULL)
    return NULL;
  ResourceType tmpType;
#ifndef NO_MODEL
#define __IF_OK
  if (!strncasecmp(fileName+(strlen(fileName)-4), ".obj", 4))
    tmpType = OBJ;
  else if (!strncmp(fileName+(strlen(fileName)-4), ".md2", 4))
    tmpType = MD2;
  else if (!strcasecmp(fileName, "cube") ||
           !strcasecmp(fileName, "sphere") ||
           !strcasecmp(fileName, "plane") ||
           !strcasecmp(fileName, "cylinder") ||
           !strcasecmp(fileName, "cone"))
    tmpType = PRIM;
#endif /* NO_MODEL */
#ifndef NO_AUDIO
#ifdef __IF_OK
  else
#endif
#define __IF_OK
  if (!strncasecmp(fileName+(strlen(fileName)-4), ".wav", 4))
    tmpType = WAV;
  else if (!strncasecmp(fileName+(strlen(fileName)-4), ".mp3", 4))
    tmpType = MP3;
  else if (!strncasecmp(fileName+(strlen(fileName)-4), ".ogg", 4))
    tmpType = OGG;
#endif /* NO_AUDIO */
#ifndef NO_TEXT
#ifdef __IF_OK
  else
#endif
#define __IF_OK
 if (!strncasecmp(fileName+(strlen(fileName)-4), ".ttf", 4))
    tmpType = TTF;
#endif /* NO_TEXT */
#ifndef NO_SHADERS
#ifdef __IF_OK
  else
#endif
#define __IF_OK
 if (!strncasecmp(fileName+(strlen(fileName)-5), ".vert", 5))
    tmpType = SHADER;
#endif /* NO_SHADERS */
#ifndef NO_TEXTURES
#ifdef __IF_OK
  else
#else
  if
#endif
   tmpType = IMAGE;
#endif /* NO_TEXTURES */
#undef __IF_OK
  return this->load(fileName, tmpType, prio, param1, param2, param3);
}

/**
 * loads resources
 * @param fileName: The fileName of the resource to load
 * @param type: The Type of Resource to load.
 * @param prio: The ResourcePriority of this resource (will only be increased)
 * @param param1: an additional option to parse (see the constuctors for more help)
 * @param param2: an additional option to parse (see the constuctors for more help)
 * @param param3: an additional option to parse (see the constuctors for more help)
 * @returns a pointer to a desired Resource.
*/
BaseObject* ResourceManager::load(const char* fileName, ResourceType type, ResourcePriority prio,
                            void* param1, void* param2, void* param3)
{
  if (fileName == NULL)
    return NULL;

  // searching if the resource was loaded before.
  Resource* tmpResource = this->locateResourceByInfo(fileName, type, param1, param2, param3);
  if (tmpResource != NULL) // if the resource was loaded before.
    {
      PRINTF(4)("not loading cached resource %s\n", tmpResource->name);
      tmpResource->count++;
      if(tmpResource->prio < prio)
        tmpResource->prio = prio;
    }
  else
    {
      // Setting up the new Resource
      tmpResource = new Resource;
      tmpResource->count = 1;
      tmpResource->type = type;
      tmpResource->prio = prio;
      tmpResource->pointer = NULL;
      tmpResource->name = new char[strlen(fileName)+1];
      strcpy(tmpResource->name, fileName);

      // creating the full name. (directoryName + FileName)
      char* fullName = ResourceManager::getFullName(fileName);
      // Checking for the type of resource \see ResourceType
      switch(type)
        {
#ifndef NO_MODEL
        case OBJ:
          if (param1)
            tmpResource->modelSize = *(float*)param1;
          else
            tmpResource->modelSize = 1.0;

          if(ResourceManager::isFile(fullName))
            tmpResource->pointer = new OBJModel(fullName, tmpResource->modelSize);
          else
            {
              PRINTF(2)("File %s in %s does not exist. Loading a cube-Model instead\n", fileName, dataDir);
              tmpResource->pointer = ResourceManager::load("cube", PRIM, prio, &tmpResource->modelSize);
            }
          break;
        case PRIM:
          if (param1)
            tmpResource->modelSize = *(float*)param1;
          else
            tmpResource->modelSize = 1.0;

          if (!strcmp(tmpResource->name, "cube"))
            tmpResource->pointer = new PrimitiveModel(PRIM_CUBE, tmpResource->modelSize);
          else if (!strcmp(tmpResource->name, "sphere"))
            tmpResource->pointer = new PrimitiveModel(PRIM_SPHERE, tmpResource->modelSize);
          else if (!strcmp(tmpResource->name, "plane"))
            tmpResource->pointer = new PrimitiveModel(PRIM_PLANE, tmpResource->modelSize);
          else if (!strcmp(tmpResource->name, "cylinder"))
            tmpResource->pointer = new PrimitiveModel(PRIM_CYLINDER, tmpResource->modelSize);
          else if (!strcmp(tmpResource->name, "cone"))
            tmpResource->pointer = new PrimitiveModel(PRIM_CONE, tmpResource->modelSize);
          break;
        case MD2:
          if(ResourceManager::isFile(fullName))
            {
              if (param1 != NULL)
                {
                  tmpResource->secFileName = new char[strlen((const char*)param1)+1];
                  strcpy(tmpResource->secFileName, (const char*) param1);
                }
              else
                tmpResource->secFileName = NULL;
                tmpResource->pointer = new MD2Data(fullName, tmpResource->secFileName);
//               tmpResource->pointer = new MD2Model(fullName, tmpResource->secFileName);

            }
              break;
#endif /* NO_MODEL */
#ifndef NO_TEXT
        case TTF:
            if (param1 != NULL)
              tmpResource->ttfSize = *(unsigned int*)param1;
            else
              tmpResource->ttfSize = FONT_DEFAULT_RENDER_SIZE;

          if(isFile(fullName))
            tmpResource->pointer = new Font(fullName, tmpResource->ttfSize);
          else
            PRINTF(2)("%s does not exist in %s. Not loading Font\n", fileName, this->dataDir);
          break;
#endif /* NO_TEXT */
#ifndef NO_AUDIO
        case WAV:
          if(isFile(fullName))
            tmpResource->pointer = new SoundBuffer(fullName);
          break;
        case OGG:
          if (isFile(fullName))
            tmpResource->pointer = new OggPlayer(fullName);
          break;
#endif /* NO_AUDIO */
#ifndef NO_TEXTURES
        case IMAGE:
          if(isFile(fullName))
            {
              PRINTF(4)("Image %s resides to %s\n", fileName, fullName);
              tmpResource->pointer = new Texture(fullName);
            }
          else
            {
              std::list<char*>::iterator imageDir;
              for (imageDir = this->imageDirs.begin(); imageDir != this->imageDirs.end(); imageDir++)
                {
                  char* imgName = new char[strlen(*imageDir)+strlen(fileName)+1];
                  sprintf(imgName, "%s%s", *imageDir, fileName);
                  if(isFile(imgName))
                    {
                      PRINTF(4)("Image %s resides to %s\n", fileName, imgName);
                      tmpResource->pointer = new Texture(imgName);
                      delete[] imgName;
                      break;
                    }
                  delete[] imgName;
                }
            }
          if(!tmpResource)
             PRINTF(2)("!!Image %s not Found!!\n", fileName);
          break;
#endif /* NO_TEXTURES */
#ifndef NO_SHADERS
          case SHADER:
            if(ResourceManager::isFile(fullName))
            {
              if (param1 != NULL)
              {
                char* secFullName = ResourceManager::getFullName((const char*)param1);
                if (ResourceManager::isFile(secFullName))
                {
                  tmpResource->secFileName = new char[strlen((const char*)param1)+1];
                  strcpy(tmpResource->secFileName, (const char*) param1);
                  tmpResource->pointer = new Shader(fullName, secFullName);
                }
                delete[] secFullName;
              }
              else
              {
                tmpResource->secFileName = NULL;
                tmpResource->pointer = new Shader(fullName, NULL);
              }
            }
            break;
#endif /* NO_SHADERS */
        default:
          tmpResource->pointer = NULL;
          PRINTF(1)("No type found for %s.\n   !!This should not happen unless the Type is not supported yet. JUST DO IT!!\n", tmpResource->name);
          break;
        }
      if (tmpResource->pointer != NULL)
        this->resourceList.push_back(tmpResource);
      delete[] fullName;
    }
  if (tmpResource->pointer != NULL)
    return tmpResource->pointer;
  else
    {
      PRINTF(2)("Resource %s could not be loaded\n", fileName);
      delete[] tmpResource->name;
      delete tmpResource;
      return NULL;
    }
}

/**
 * unloads a Resource
 * @param pointer: The pointer to free
 * @param prio: the PriorityLevel to unload this resource
 * @returns true if successful (pointer found, and deleted), false otherwise
*/
bool ResourceManager::unload(void* pointer, ResourcePriority prio)
{
  if (pointer == NULL)
    return false;
  // if pointer is existent. and only one resource of this type exists.
  Resource* tmpResource = this->locateResourceByPointer(pointer);
  if (tmpResource != NULL)
    return unload(tmpResource, prio);
  else
  {
    PRINTF(2)("Resource not Found %p\n", pointer);
    return false;
  }
}

/**
 * unloads a Resource
 * @param resource: The resource to unloade
 * @param prio the PriorityLevel to unload this resource
 * @returns true on success, false otherwise.
*/
bool ResourceManager::unload(Resource* resource, ResourcePriority prio)
{
  if (resource == NULL)
    return false;
  if (resource->count > 0)
    resource->count--;

  if (resource->prio <= prio)
    {
      if (resource->count == 0)
        {
          // deleting the Resource
          switch(resource->type)
            {
#ifndef NO_MODEL
            case OBJ:
            case PRIM:
              delete (Model*)resource->pointer;
              break;
            case MD2:
              delete (MD2Data*)resource->pointer;
              break;
#endif /* NO_MODEL */
#ifndef NO_AUDIO
            case WAV:
              delete (SoundBuffer*)resource->pointer;
              break;
            case OGG:
              delete (OggPlayer*)resource->pointer;
              break;
#endif /* NO_AUDIO */
#ifndef NO_TEXT
            case TTF:
              delete (Font*)resource->pointer;
              break;
#endif /* NO_TEXT */
#ifndef NO_TEXTURES
            case IMAGE:
              delete (Texture*)resource->pointer;
              break;
#endif /* NO_TEXTURES */
#ifndef NO_SHADERS
            case SHADER:
              delete (Shader*)resource->pointer;
              break;
#endif /* NO_SHADERS */
            default:
              PRINTF(2)("NOT YET IMPLEMENTED !!FIX FIX!!\n");
              return false;
              break;
            }
          // deleting the List Entry:
          PRINTF(4)("Resource %s safely removed.\n", resource->name);
          delete[] resource->name;
          std::list<Resource*>::iterator resourceIT = std::find(this->resourceList.begin(), this->resourceList.end(), resource);
          this->resourceList.erase(resourceIT);
          delete resource;
        }
      else
        PRINTF(4)("Resource %s not removed, because there are still %d References to it.\n", resource->name, resource->count);
    }
  else
    PRINTF(4)("not deleting resource %s because DeleteLevel to high\n", resource->name);
  return true;
}


/**
 * unloads all alocated Memory of Resources with a pririty lower than prio
 * @param prio The priority to delete
*/
bool ResourceManager::unloadAllByPriority(ResourcePriority prio)
{
  std::list<Resource*>::iterator resource, pre;
  pre = --this->resourceList.end();
  unsigned int removeCount;
  for (unsigned int round = 0; round < 3; round++)
  {
    removeCount = 0;
    while (pre != resourceList.end())
    {
      resource = pre;
      pre--;
        if ((*resource)->prio <= prio)
        {
          if ((*resource)->count == 0)
            unload((*resource), prio);
          else
          {
            PRINTF(2)("unable to unload %s because there are still %d references to it\n",
                     (*resource)->name, (*resource)->count);
            removeCount++;
          }
        }
     }
     if (removeCount == 0) break;
  }
}


/**
 * Searches for a Resource by some information
 * @param fileName: The name to look for
 * @param type the Type of resource to locate.
 * @param param1: an additional option to parse (see the constuctors for more help)
 * @param param2: an additional option to parse (see the constuctors for more help)
 * @param param3: an additional option to parse (see the constuctors for more help)
 * @returns a Pointer to the Resource if found, NULL otherwise.
*/
Resource* ResourceManager::locateResourceByInfo(const char* fileName, ResourceType type,
                                                void* param1, void* param2, void* param3) const
{
  std::list<Resource*>::const_iterator resource;
  for (resource = this->resourceList.begin(); resource != this->resourceList.end(); resource++)
  {
    if ((*resource)->type == type && !strcmp(fileName, (*resource)->name))
        {
          bool match = false;

          switch (type)
            {
#ifndef NO_MODEL
            case PRIM:
            case OBJ:
              if (!param1)
                {
                  if ((*resource)->modelSize == 1.0)
                    match = true;
                }
              else if ((*resource)->modelSize == *(float*)param1)
                match = true;
              break;
            case MD2:
              if (!param1)
                {
                  if ((*resource)->secFileName == NULL)
                    match = true;
                }
              else if (!strcmp((*resource)->secFileName, (const char*)param1))
                match = true;
              break;
#endif /* NO_MODEL */
#ifndef NO_TEXT
            case TTF:
              if (param1 == NULL)
                {
                  if ((*resource)->ttfSize == FONT_DEFAULT_RENDER_SIZE)
                    match = true;
                }
              else if ((*resource)->ttfSize == *(unsigned int*)param1)
                match = true;
              break;
#endif /* NO_TEXT */
#ifndef NO_SHADERS
              case SHADER:
                if (!param1)
                {
                  if ((*resource)->secFileName == NULL)
                    match = true;
                }
                else if (!strcmp((*resource)->secFileName, (const char*)param1))
                  match = true;
#endif /* NO_SHADERS */
            default:
              match = true;
              break;
            }
          if (match)
            {
              return (*resource);
            }
        }
    }
  return NULL;
}

/**
 * Searches for a Resource by Pointer
 * @param pointer the Pointer to search for
 * @returns a Pointer to the Resource if found, NULL otherwise.
*/
Resource* ResourceManager::locateResourceByPointer(const void* pointer) const
{
  //  Resource* enumRes = resourceList->enumerate();
  std::list<Resource*>::const_iterator resource;
  for (resource = this->resourceList.begin(); resource != this->resourceList.end(); resource++)
    if (pointer == (*resource)->pointer)
        return (*resource);
  return NULL;
}

/**
 * Checks if it is a Directory
 * @param directoryName the Directory to check for
 * @returns true if it is a directory/symlink false otherwise
*/
bool ResourceManager::isDir(const char* directoryName)
{
  if (directoryName == NULL)
    return false;

  char* tmpDirName = NULL;
  struct stat status;

  // checking for the termination of the string given. If there is a "/" at the end cut it away
  if (directoryName[strlen(directoryName)-1] == '/' ||
      directoryName[strlen(directoryName)-1] == '\\')
    {
      tmpDirName = new char[strlen(directoryName)];
      strncpy(tmpDirName, directoryName, strlen(directoryName)-1);
      tmpDirName[strlen(directoryName)-1] = '\0';
    }
  else
    {
      tmpDirName = new char[strlen(directoryName)+1];
      strcpy(tmpDirName, directoryName);
    }

  if(!stat(tmpDirName, &status))
    {
      if (status.st_mode & (S_IFDIR
#ifndef __WIN32__
                            | S_IFLNK
#endif
                            ))
        {
          delete[] tmpDirName;
          return true;
        }
      else
        {
          delete[] tmpDirName;
          return false;
        }
    }
  else
  {
    delete[] tmpDirName;
    return false;
  }
}

/**
 * Checks if the file is either a Regular file or a Symlink
 * @param fileName the File to check for
 * @returns true if it is a regular file/symlink, false otherwise
*/
bool ResourceManager::isFile(const char* fileName)
{
  if (fileName == NULL)
    return false;
  char* tmpFileName = ResourceManager::homeDirCheck(fileName);
  // actually checks the File
  struct stat status;
  if (!stat(tmpFileName, &status))
    {
      if (status.st_mode & (S_IFREG
#ifndef __WIN32__
                            | S_IFLNK
#endif
                            ))
        {
          delete[] tmpFileName;
          return true;
        }
      else
        {
          delete[] tmpFileName;
          return false;
        }
    }
  else
    {
      delete[] tmpFileName;
      return false;
    }
}

/**
 * touches a File on the disk (thereby creating it)
 * @param fileName The file to touch
*/
bool ResourceManager::touchFile(const char* fileName)
{
  char* tmpName = ResourceManager::homeDirCheck(fileName);
  if (tmpName == NULL)
    return false;
  FILE* stream;
  if( (stream = fopen (tmpName, "w")) == NULL)
    {
      PRINTF(1)("could not open %s fro writing\n", fileName);
      delete[] tmpName;
      return false;
    }
  fclose(stream);

  delete[] tmpName;
}

/**
 * deletes a File from disk
 * @param fileName the File to delete
*/
bool ResourceManager::deleteFile(const char* fileName)
{
  if (fileName == NULL)
    return false;
  char* tmpName = ResourceManager::homeDirCheck(fileName);
  unlink(tmpName);
  delete[] tmpName;
}

/**
 * @param name the Name of the file to check
 * @returns The name of the file, including the HomeDir
 * IMPORTANT: this has to be deleted from the outside
 */
char* ResourceManager::homeDirCheck(const char* name)
{
  if (name == NULL)
    return NULL;
  char* retName;
  if (!strncmp(name, "~/", 2))
    {
      char tmpFileName[500];
#ifdef __WIN32__
      strcpy(tmpFileName, getenv("USERPROFILE"));
#else
      strcpy(tmpFileName, getenv("HOME"));
#endif
      retName = new char[strlen(tmpFileName)+strlen(name)];
      sprintf(retName, "%s%s", tmpFileName, name+1);
    }
  else
    {
      retName = new char[strlen(name)+1];
      strcpy(retName, name);
    }
  return retName;
}

/**
 * @param fileName the Name of the File to check
 * @returns The full name of the file, including the DataDir, and NULL if the file does not exist
 * !!IMPORTANT: this has to be deleted from the outside!!
*/
char* ResourceManager::getFullName(const char* fileName)
{
  if (fileName == NULL || ResourceManager::getInstance()->getDataDir() == NULL)
    return NULL;

  char* retName = new char[strlen(ResourceManager::getInstance()->getDataDir())
                           + strlen(fileName) + 1];
  sprintf(retName, "%s%s", ResourceManager::getInstance()->getDataDir(), fileName);
  if (ResourceManager::isFile(retName) || ResourceManager::isDir(retName))
    return retName;
  else
    {
      delete[] retName;
      return NULL;
    }
}


/**
 * checks wether a file is in the DataDir.
 * @param fileName the File to check if it is in the Data-Dir structure.
 * @returns true if the file exists, false otherwise
 */
bool ResourceManager::isInDataDir(const char* fileName)
{
  if (fileName == NULL || ResourceManager::getInstance()->getDataDir() == NULL)
    return false;

  bool retVal = false;
  char* checkFile = new char[strlen(ResourceManager::getInstance()->getDataDir())
      + strlen(fileName) + 1];
  sprintf(checkFile, "%s%s", ResourceManager::getInstance()->getDataDir(), fileName);

  if (ResourceManager::isFile(checkFile) || ResourceManager::isDir(checkFile))
    retVal = true;
  else
    retVal = false;
  delete[] checkFile;
  return retVal;
}


/**
 * outputs debug information about the ResourceManager
*/
void ResourceManager::debug() const
{
  PRINT(0)("=RM===================================\n");
  PRINT(0)("= RESOURCE-MANAGER DEBUG INFORMATION =\n");
  PRINT(0)("======================================\n");
  // if it is not initialized
  PRINT(0)(" Reference is: %p\n", ResourceManager::singletonRef);
  PRINT(0)(" Data-Directory is: %s\n", this->dataDir);
  PRINT(0)(" List of Image-Directories: ");
  std::list<char*>::const_iterator imageDir;
  for (imageDir = this->imageDirs.begin(); imageDir != this->imageDirs.end(); imageDir++)
      PRINT(0)("%s ", (*imageDir));
  PRINT(0)("\n");

  PRINT(0)("List of all stored Resources:\n");
  std::list<Resource*>::const_iterator resource;
  for (resource = this->resourceList.begin(); resource != this->resourceList.end(); resource++)

    {
      PRINT(0)("-----------------------------------------\n");
      PRINT(0)("Name: %s; References: %d; Type: %s ", (*resource)->name, (*resource)->count, ResourceManager::ResourceTypeToChar((*resource)->type));

      PRINT(0)("gets deleted at ");
      switch((*resource)->prio)
        {
        default:
        case RP_NO:
          PRINT(0)("first posibility (0)\n");
          break;
        case RP_LEVEL:
          PRINT(0)("the end of the Level (1)\n");
          break;
        case RP_CAMPAIGN:
          PRINT(0)("the end of the campaign (2)\n");
          break;
        case RP_GAME:
          PRINT(0)("when leaving the game (3)\n");
          break;
        }
    }



  PRINT(0)("==================================RM==\n");
}


/**
 * converts a ResourceType into the corresponding String
 * @param type the ResourceType to translate
 * @returns the converted String.
 */
const char* ResourceManager::ResourceTypeToChar(ResourceType type)
{
  switch (type)
  {
#ifndef NO_MODEL
    case OBJ:
      return "ObjectModel";
      break;
    case PRIM:
      return "PrimitiveModel";
      break;
    case MD2:
      return "MD2-Data";
      break;
#endif
#ifndef NO_TEXTURES
    case IMAGE:
      return "ImageFile (Texture)";
      break;
#endif
#ifndef NO_AUDIO
    case WAV:
      return "SoundFile";
      break;
    case OGG:
      return "MusicFile";
      break;
#endif
#ifndef NO_TEXT
    case TTF:
      return "Font (TTF)";
      break;
#endif
#ifndef NO_SHADERS
    case SHADER:
      return "Shader";
      break;
#endif
    default:
      return "unknown Format";
      break;
  }
}