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palmos-fs.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2003-2005 The ScummVM Team
 *
 * 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.
 *
 * $Header: /cvsroot/scummvm/scummvm/backends/fs/palmos/palmos-fs.cpp,v 1.10.2.1 2005/10/18 02:11:16 sev Exp $
 */

#if defined(PALMOS_MODE)

#include "common/stdafx.h"
#include "fs/fs.h"
#include <stdio.h>
#include <stdlib.h>

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

class PalmOSFilesystemNode : public AbstractFilesystemNode {
protected:
      String _displayName;
      bool _isDirectory;
      bool _isValid;
      bool _isPseudoRoot;
      String _path;
      
public:
      PalmOSFilesystemNode();
      PalmOSFilesystemNode(const Char *path);
      PalmOSFilesystemNode(const PalmOSFilesystemNode *node);

      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 FSList listDir(ListMode) const;
      virtual AbstractFilesystemNode *parent() const;

private:
      static void addFile (FSList &list, ListMode mode, const Char *base, FileInfoType* find_data);
};

void PalmOSFilesystemNode::addFile(FSList &list, ListMode mode, const char *base, FileInfoType* find_data) {
      PalmOSFilesystemNode entry;
      bool isDirectory;

      isDirectory = (find_data->attributes & vfsFileAttrDirectory);

      if ((!isDirectory && mode == kListDirectoriesOnly) ||
            (isDirectory && mode == kListFilesOnly))
            return;

      entry._isDirectory = isDirectory;
      entry._displayName = find_data->nameP;
      entry._path = base;
      entry._path += find_data->nameP;
      if (entry._isDirectory)
            entry._path += "/";

      entry._isValid = true;  
      entry._isPseudoRoot = false;
      list.push_back(wrap(new PalmOSFilesystemNode(&entry)));
}

AbstractFilesystemNode *FilesystemNode::getRoot() {
      return new PalmOSFilesystemNode();
}

PalmOSFilesystemNode::PalmOSFilesystemNode() {
      _isDirectory = true;
      _displayName = "Root";
      _isValid = true;
      _path = "/";
      _isPseudoRoot = true;
}

PalmOSFilesystemNode::PalmOSFilesystemNode(const PalmOSFilesystemNode *node) {
      _displayName = node->_displayName;
      _isDirectory = node->_isDirectory;
      _isValid = node->_isValid;
      _isPseudoRoot = node->_isPseudoRoot;
      _path = node->_path;
}

FSList PalmOSFilesystemNode::listDir(ListMode mode) const {

      FSList myList;
      Err e;
      Char nameP[256];
      FileInfoType desc;
      FileRef handle;
      UInt32 dirIterator = expIteratorStart;

      desc.nameP = nameP;
      desc.nameBufLen = 256;
      e = VFSFileOpen(gVars->VFS.volRefNum, _path.c_str(), vfsModeRead, &handle);

      if (e)
            return myList;
      
      while(dirIterator != expIteratorStop) {
            e = VFSDirEntryEnumerate(handle, &dirIterator, &desc);
            if (!e) {
                  addFile(myList, mode, _path.c_str(), &desc);
            }
      }

      VFSFileClose(handle);

      return myList;
}

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 *PalmOSFilesystemNode::parent() const {
      PalmOSFilesystemNode *p = 0;
      
      if (!_isPseudoRoot) {
            const char *start = _path.c_str();
            const char *end = lastPathComponent(_path);
      
            p = new PalmOSFilesystemNode();
            p->_path = String(start, end - start);
            p->_isValid = true;
            p->_isDirectory = true;
            p->_displayName = lastPathComponent(p->_path);
            p->_isPseudoRoot =(p->_path == "/");
      }
      return p;
}

#endif // PALMOS_MODE

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