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symbian-fs.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2003-2005 Andreas 'Sprawl' Karlsson - Original EPOC port, ESDL
 * Copyright (C) 2003-2005 Lars 'AnotherGuest' Persson - Original EPOC port, Audio System
 * Copyright (C) 2005 Jurgen 'SumthinWicked' Braam - EPOC/CVS maintainer
 * Copyright (C) 2005-2006 The ScummVM project
 *
 * 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://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/backends/fs/symbian/symbian-fs.cpp $
 * $Id: symbian-fs.cpp 22424 2006-05-12 21:41:54Z fingolfin $
 */

#if defined (__SYMBIAN32__) 
#include "common/stdafx.h"
#include "backends/fs/abstract-fs.h"
#include "backends/fs/fs.h"

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

/*
 * Implementation of the ScummVM file system API based on POSIX.
 */

class SymbianFilesystemNode : public AbstractFilesystemNode {
protected:
      String _displayName;
      bool _isDirectory;
      bool _isValid;
      String _path;
      bool _isPseudoRoot;

public:
      SymbianFilesystemNode(bool aIsRoot);
      SymbianFilesystemNode(const String &path);
      virtual String displayName() const { return _displayName; }
      virtual bool isValid() const { return _isValid; }
      virtual bool isDirectory() const { return _isDirectory; }
      virtual String path() const { return _path; }

      virtual bool listDir(AbstractFSList &list, ListMode mode) const;
      virtual AbstractFilesystemNode *parent() const;
      virtual AbstractFilesystemNode *child(const String &name) const;
};


static const char *lastPathComponent(const Common::String &str) {
      const char *start = str.c_str();
      const char *cur = start + str.size() - 2;

      while (cur > start && *cur != '\\') {
            --cur;
      }

      return cur + 1;
}

AbstractFilesystemNode *AbstractFilesystemNode::getCurrentDirectory() {
      return AbstractFilesystemNode::getRoot();
}

AbstractFilesystemNode *AbstractFilesystemNode::getRoot() {
      return new SymbianFilesystemNode(true);
}

AbstractFilesystemNode *AbstractFilesystemNode::getNodeForPath(const String &path) {
      return new SymbianFilesystemNode(path);
}

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

}

SymbianFilesystemNode::SymbianFilesystemNode(const String &path) {
      if (path.size() == 0)
            _isPseudoRoot = true;
      else
            _isPseudoRoot = false;

      _path = path;
      const char *dsplName = NULL, *pos = path.c_str();
      // FIXME -- why is this code scanning for a slash '/' when the rest of
      // the code in this file uses backslashes '\' ?
      // TODO: Use lastPathComponent here.
      while (*pos)
            if (*pos++ == '/')
                  dsplName = pos;
      _displayName = String(dsplName);
      _isValid = true;
      _isDirectory = true;
}

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

      if (_isPseudoRoot) {
            // Drives enumeration
            RFs fs = CEikonEnv::Static()->FsSession();
            TInt driveNumber;
            TChar driveLetter;
            TUint driveLetterValue;
            TVolumeInfo volumeInfo;
            TBuf8<30> driveLabel8;
            TBuf8<30> 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 = true;
                  entry._isValid = true;
                  entry._isPseudoRoot = false;
                  entry._path = path;
                  myList.push_back(new SymbianFilesystemNode(entry));
            }
      } else {
            TPtrC8 ptr((const unsigned char*)_path.c_str(),_path.size());
            TFileName fname;
            fname.Copy(ptr);
            TBuf8<256>nameBuf;
            CDir* dirPtr;
            if(CEikonEnv::Static()->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(false);
                        entry._isPseudoRoot = false;
                        
                        entry._displayName =(char*)nameBuf.PtrZ();
                        entry._path = _path;
                        entry._path +=(char*)nameBuf.PtrZ();
                        entry._isDirectory = fileentry.IsDir();
                        
                        // Honor the chosen mode
                        if ((mode == FilesystemNode::kListFilesOnly && entry._isDirectory) ||
                              (mode == FilesystemNode::kListDirectoriesOnly && !entry._isDirectory))
                              continue;
                        
                        if (entry._isDirectory)
                              entry._path += "\\";
                        myList.push_back(new SymbianFilesystemNode(entry));
                  }
                  CleanupStack::PopAndDestroy(dirPtr);
            }

      }
      return true;
}

AbstractFilesystemNode *SymbianFilesystemNode::parent() 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(false);
            const char *start = _path.c_str();
            const char *end = lastPathComponent(_path);

            p->_path = String(start, end - start);
            p->_isValid = true;
            p->_isDirectory = true;
            p->_displayName = lastPathComponent(p->_path);
      }
      else
      {
            p=new SymbianFilesystemNode(true);
      }
      return p;
}

AbstractFilesystemNode *SymbianFilesystemNode::child(const String &name) const {
      assert(_isDirectory);
      String newPath(_path);

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

      TPtrC8 ptr((const unsigned char*) newPath.c_str(), newPath.size());
      TFileName fname;
      fname.Copy(ptr);
      TBool isFolder = EFalse;
      BaflUtils::IsFolder(CEikonEnv::Static()->FsSession(), fname, isFolder);
      if(!isFolder)
            return 0;

      SymbianFilesystemNode *p = new SymbianFilesystemNode(newPath);
      return p;
}

#endif // defined(__SYMBIAN32__)

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