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palmos-fs.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2003-2006 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.
 *
 * $URL: https://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/backends/fs/palmos/palmos-fs.cpp $
 * $Id: palmos-fs.cpp 22867 2006-06-03 11:21:39Z chrilith $
 */

#if defined(PALMOS_MODE)

#include "common/stdafx.h"
#include "backends/fs/abstract-fs.h"
#include "backends/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 String &p);

      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;

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

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;
}

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

      isDir = (find_data->attributes & vfsFileAttrDirectory);

      if ((!isDir && mode == FilesystemNode::kListDirectoriesOnly) ||
            (isDir && mode == FilesystemNode::kListFilesOnly))
            return;

      entry._isDirectory = isDir;
      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(new PalmOSFilesystemNode(entry));
}

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

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

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


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

PalmOSFilesystemNode::PalmOSFilesystemNode(const String &p) {
      _path = p;
      _displayName = lastPathComponent(p);

      UInt32 attr;
      FileRef handle;
      Err e = VFSFileOpen(gVars->VFS.volRefNum, _path.c_str(), vfsModeRead, &handle);
      if (!e) {
            e = VFSFileGetAttributes(handle, &attr);
            VFSFileClose(handle);
      }

      if (e) {
            _isValid = false;
            _isDirectory = false;

      } else {
            _isValid = true;
            _isDirectory = (attr & vfsFileAttrDirectory);
      }
      _isPseudoRoot = false;
}

bool PalmOSFilesystemNode::listDir(AbstractFSList &myList, ListMode mode) const {
      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 false;
      
      while(dirIterator != expIteratorStop) {
            e = VFSDirEntryEnumerate(handle, &dirIterator, &desc);
            if (!e) {
                  addFile(myList, mode, _path.c_str(), &desc);
            }
      }

      VFSFileClose(handle);

      return true;
}


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;
}


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

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

      FileRef handle;
      UInt32 attr;
      Err e = VFSFileOpen(gVars->VFS.volRefNum, newPath.c_str(), vfsModeRead, &handle);
      if (e)
            return 0;
      
      e = VFSFileGetAttributes(handle, &attr);
      VFSFileClose(handle);

      if (e || !(attr & vfsFileAttrDirectory))
            return 0;

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

#endif // PALMOS_MODE

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