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dc-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-0-13-1/backends/platform/dc/dc-fs.cpp $
 * $Id: dc-fs.cpp 35648 2009-01-01 15:06:43Z sev $
 */

#include "dc.h"
#include "backends/fs/abstract-fs.h"
#include "backends/fs/stdiostream.h"

#include <ronin/cdfs.h>
#include <stdio.h>
#include <unistd.h>

/**
 * Implementation of the ScummVM file system API based on Ronin.
 *
 * Parts of this class are documented in the base interface class, AbstractFSNode.
 */
00038 class RoninCDFileNode : public AbstractFSNode {
protected:
      Common::String _path;

public:
      RoninCDFileNode(const Common::String &path) : _path(path) {};

      virtual bool exists() const { return true; }
00046       virtual Common::String getName() const { return lastPathComponent(_path, '/'); }
00047       virtual Common::String getPath() const { return _path; }
00048       virtual bool isDirectory() const { return false; }
00049       virtual bool isReadable() const { return true; }
00050       virtual bool isWritable() const { return false; }

00052       virtual AbstractFSNode *getChild(const Common::String &n) const { return NULL; }
00053       virtual bool getChildren(AbstractFSList &list, ListMode mode, bool hidden) const { return false; }
      virtual AbstractFSNode *getParent() const;

      virtual Common::SeekableReadStream *openForReading();
00057       virtual Common::WriteStream *openForWriting() { return 0; }

      static AbstractFSNode *makeFileNodePath(const Common::String &path);
};

/* A directory */
class RoninCDDirectoryNode : public RoninCDFileNode {
public:
      RoninCDDirectoryNode(const Common::String &path) : RoninCDFileNode(path) {};

      virtual bool isDirectory() const { return true; }
      virtual AbstractFSNode *getChild(const Common::String &n) const;
      virtual bool getChildren(AbstractFSList &list, ListMode mode, bool hidden) const;
      virtual Common::SeekableReadStream *openForReading() { return 0; }
};

/* A file/directory which does not exist */
class RoninCDNonexistingNode : public RoninCDFileNode {
public:
      RoninCDNonexistingNode(const Common::String &path) : RoninCDFileNode(path) {};

      virtual bool exists() const { return false; }
      virtual bool isReadable() const { return false; }
      virtual Common::SeekableReadStream *openForReading() { return 0; }
};

AbstractFSNode *RoninCDFileNode::makeFileNodePath(const Common::String &path) {
      assert(path.size() > 0);

      int fd;

      if ((fd = open(path.c_str(), O_RDONLY)) >= 0) {
            close(fd);
            return new RoninCDFileNode(path);
      } else if ((fd = open(path.c_str(), O_DIR|O_RDONLY)) >= 0) {
            close(fd);
            return new RoninCDDirectoryNode(path);
      } else {
            return NULL;
      }
}

AbstractFSNode *RoninCDDirectoryNode::getChild(const Common::String &n) const {
      Common::String newPath(_path);
      if (_path.lastChar() != '/')
            newPath += '/';
      newPath += n;

      return makeFileNodePath(newPath);
}

bool RoninCDDirectoryNode::getChildren(AbstractFSList &myList, ListMode mode, bool hidden) const {

      DIR *dirp = opendir(_path.c_str());
      struct dirent *dp;

      if (dirp == NULL)
            return false;

      // ... loop over dir entries using readdir
      while ((dp = readdir(dirp)) != NULL) {
            Common::String newPath(_path);
            if (newPath.lastChar() != '/')
                  newPath += '/';
            newPath += dp->d_name;

            if (dp->d_size < 0) {
                  // Honor the chosen mode
                  if (mode == Common::FSNode::kListFilesOnly)
                        continue;

                  myList.push_back(new RoninCDDirectoryNode(newPath+"/"));
            } else {
                  // Honor the chosen mode
                  if (mode == Common::FSNode::kListDirectoriesOnly)
                        continue;

                  myList.push_back(new RoninCDFileNode(newPath));
            }
      }
      closedir(dirp);

      return true;
}

00142 AbstractFSNode *RoninCDFileNode::getParent() const {
      if (_path == "/")
            return 0;

      const char *start = _path.c_str();
      const char *end = lastPathComponent(_path, '/');

      return new RoninCDDirectoryNode(Common::String(start, end - start));
}


00153 Common::SeekableReadStream *RoninCDFileNode::openForReading() {
      return StdioStream::makeFromPath(getPath().c_str(), false);
}

AbstractFSNode *OSystem_Dreamcast::makeRootFileNode() const {
      return new RoninCDDirectoryNode("/");
}

AbstractFSNode *OSystem_Dreamcast::makeCurrentDirectoryFileNode() const {
      return makeRootFileNode();
}

AbstractFSNode *OSystem_Dreamcast::makeFileNodePath(const Common::String &path) const {
      AbstractFSNode *node = RoninCDFileNode::makeFileNodePath(path);
      return (node? node : new RoninCDNonexistingNode(path));
}


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