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symbian-fs.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: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-1-0-0/backends/fs/symbian/symbian-fs.cpp $
 * $Id: symbian-fs.cpp 40867 2009-05-24 15:17:42Z lordhoto $
 */

#if defined (__SYMBIAN32__)
#include "backends/fs/abstract-fs.h"
#include "backends/fs/symbian/symbianstream.h"
#include "backends/platform/symbian/src/symbianos.h"

#include <dirent.h>
#include <eikenv.h>
#include <f32file.h>
#include <bautils.h>

#define KDriveLabelSize 30

/**
 * Implementation of the ScummVM file system API based on POSIX.
 *
 * Parts of this class are documented in the base interface class, AbstractFSNode.
 */
class SymbianFilesystemNode : public AbstractFSNode {
protected:
      Common::String _displayName;
      Common::String _path;
      TBool _isDirectory;
      TBool _isValid;
      TBool _isPseudoRoot;
public:
      /**
       * Creates a SymbianFilesystemNode with the root node as path.
       *
       * @param aIsRoot true if the node will be a pseudo root, false otherwise.
       */
      SymbianFilesystemNode(bool aIsRoot);

      /**
       * Creates a SymbianFilesystemNode for a given path.
       *
       * @param path Common::String with the path the new node should point to.
       */
      SymbianFilesystemNode(const Common::String &path);

      virtual bool exists() const {
            TFileName fname;
            TPtrC8 ptr((const unsigned char*) _path.c_str(), _path.size());
            fname.Copy(ptr);
            TBool fileExists = BaflUtils::FileExists(static_cast<OSystem_SDL_Symbian*> (g_system)->FsSession(), fname);
            if(!fileExists) {
                  TParsePtrC parser(fname);
                  if(parser.PathPresent() && parser.Path().Compare(_L("\\")) == KErrNone && !parser.NameOrExtPresent()) {
                        fileExists = ETrue;
                  }
            }
            return fileExists;
      }
      virtual Common::String getDisplayName() const { return _displayName; }
      virtual Common::String getName() const { return _displayName; }
      virtual Common::String getPath() const { return _path; }
      virtual bool isDirectory() const { return _isDirectory; }
      virtual bool isReadable() const { return access(_path.c_str(), R_OK) == 0; }  //FIXME: this is just a stub
      virtual bool isWritable() const { return access(_path.c_str(), W_OK) == 0; }  //FIXME: this is just a stub

      virtual AbstractFSNode *getChild(const Common::String &n) const;
      virtual bool getChildren(AbstractFSList &list, ListMode mode, bool hidden) const;
      virtual AbstractFSNode *getParent() const;

      virtual Common::SeekableReadStream *createReadStream();
      virtual Common::WriteStream *createWriteStream();
};

/**
 * Fixes the path by changing all slashes to backslashes.
 *
 * @param path Common::String with the path to be fixed.
 */
static void fixFilePath(Common::String& aPath){
      TInt len = aPath.size();

      for (TInt index = 0; index < len; index++) {
            if (aPath[index] == '/') {
                  aPath.setChar('\\', index);
            }
      }
}

SymbianFilesystemNode::SymbianFilesystemNode(bool aIsRoot) {
      _path = "";
      _isValid = ETrue;
      _isDirectory = ETrue;
      _isPseudoRoot = aIsRoot;
      _displayName = "Root";

}

SymbianFilesystemNode::SymbianFilesystemNode(const Common::String &path) {
      if (path.size() == 0)
            _isPseudoRoot = ETrue;
      else
            _isPseudoRoot = EFalse;

      _path = path;

      fixFilePath(_path);

      _displayName = lastPathComponent(_path, '\\');

      TEntry fileAttribs;
      TFileName fname;
      TPtrC8 ptr((const unsigned char*)_path.c_str(),_path.size());
      fname.Copy(ptr);

      if (static_cast<OSystem_SDL_Symbian*>(g_system)->FsSession().Entry(fname, fileAttribs) == KErrNone) {
            _isValid = ETrue;
            _isDirectory = fileAttribs.IsDir();
      } else {
            _isValid = ETrue;
            _isDirectory = EFalse;
            TParsePtrC parser(fname);
            if(parser.PathPresent() && parser.Path().Compare(_L("\\")) == KErrNone && !parser.NameOrExtPresent())  {
                  _isDirectory = ETrue;
            }
      }
}

AbstractFSNode *SymbianFilesystemNode::getChild(const Common::String &n) const {
      assert(_isDirectory);
      Common::String newPath(_path);

      if (_path.lastChar() != '\\')
            newPath += '\\';

      newPath += n;

      return new SymbianFilesystemNode(newPath);
}

bool SymbianFilesystemNode::getChildren(AbstractFSList &myList, ListMode mode, bool hidden) const {
      assert(_isDirectory);

      //TODO: honor the hidden flag

      if (_isPseudoRoot) {
            // Drives enumeration
            RFs& fs = static_cast<OSystem_SDL_Symbian*>(g_system)->FsSession();
            TInt driveNumber;
            TChar driveLetter;
            TUint driveLetterValue;
            TVolumeInfo volumeInfo;
            TBuf8<KDriveLabelSize> driveLabel8;
            TBuf8<KDriveLabelSize> driveString8;

            for (driveNumber=EDriveA; driveNumber<=EDriveZ; driveNumber++) {
                  TInt err = fs.Volume(volumeInfo, driveNumber);
                  if (err != KErrNone)
                        continue;
                  if (fs.DriveToChar(driveNumber, driveLetter) != KErrNone)
                        continue;

                  driveLetterValue = driveLetter;

                  if (volumeInfo.iName.Length() > 0) {
                        driveLabel8.Copy(volumeInfo.iName); // 16 to 8bit des // enabling this line alone gives KERN-EXEC 3 with non-optimized GCC? WHY? grrr
                        driveString8.Format(_L8("Drive %c: (%S)"), driveLetterValue, &driveLabel8);
                  } else {
                        driveString8.Format(_L8("Drive %c:"), driveLetterValue);
                  }

                  char path[10];
                  sprintf(path,"%c:\\", driveNumber+'A');

                  SymbianFilesystemNode entry(false);
                  entry._displayName = (char*) driveString8.PtrZ(); // drive_name
                  entry._isDirectory = ETrue;
                  entry._isValid = ETrue;
                  entry._isPseudoRoot = EFalse;
                  entry._path = path;
                  myList.push_back(new SymbianFilesystemNode(entry));
            }
      } else {
            TPtrC8 ptr((const unsigned char*) _path.c_str(), _path.size());
            TFileName fname;
            TBuf8<256>nameBuf;
            CDir* dirPtr;
            fname.Copy(ptr);

            if (_path.lastChar() != '\\')
                  fname.Append('\\');

            if (static_cast<OSystem_SDL_Symbian*>(g_system)->FsSession().GetDir(fname, KEntryAttNormal|KEntryAttDir, 0, dirPtr) == KErrNone) {
                  CleanupStack::PushL(dirPtr);
                  TInt cnt=dirPtr->Count();
                  for (TInt loop=0;loop<cnt;loop++) {
                        TEntry fileentry=(*dirPtr)[loop];
                        nameBuf.Copy(fileentry.iName);
                        SymbianFilesystemNode entry(EFalse);
                        entry._isPseudoRoot = EFalse;

                        entry._displayName =(char*) nameBuf.PtrZ();
                        entry._path = _path;

                        if (entry._path.lastChar() != '\\')
                              entry._path+= '\\';

                        entry._path +=(char*) nameBuf.PtrZ();
                        entry._isDirectory = fileentry.IsDir();

                        // Honor the chosen mode
                        if ((mode == Common::FSNode::kListFilesOnly && entry._isDirectory) ||
                              (mode == Common::FSNode::kListDirectoriesOnly && !entry._isDirectory))
                              continue;

                        myList.push_back(new SymbianFilesystemNode(entry));
                  }
                  CleanupStack::PopAndDestroy(dirPtr);
            }
      }

      return true;
}

AbstractFSNode *SymbianFilesystemNode::getParent() const {
      SymbianFilesystemNode *p =NULL;

      // Root node is its own parent. Still we can't just return this
      // as the GUI code will call delete on the old node.
      if (!_isPseudoRoot && _path.size() > 3) {
            p = new SymbianFilesystemNode(EFalse);
            const char *start = _path.c_str();
            const char *end = lastPathComponent(_path, '\\');

            p->_path = Common::String(start, end - start);
            p->_isValid = ETrue;
            p->_isDirectory = ETrue;
            p->_displayName = lastPathComponent(p->_path, '\\');
      }
      else
      {
            p = new SymbianFilesystemNode(ETrue);
      }

      return p;
}

Common::SeekableReadStream *SymbianFilesystemNode::createReadStream() {
      return SymbianStdioStream::makeFromPath(getPath().c_str(), false);
}

Common::WriteStream *SymbianFilesystemNode::createWriteStream() {
      return SymbianStdioStream::makeFromPath(getPath().c_str(), true);
}
#endif //#if defined (__SYMBIAN32__)



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