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n64-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.
 *
 */

#ifdef __N64__

#include "backends/fs/abstract-fs.h"
#include "backends/fs/n64/romfsstream.h"

#include <sys/param.h>
#include <unistd.h>
#include <n64utils.h>

#define     ROOT_PATH   "/"

/**
 * Implementation of the ScummVM file system API based on N64 Hkz romfs.
 *
 * Parts of this class are documented in the base interface class, AbstractFSNode.
 */
class N64FilesystemNode : public AbstractFSNode {
protected:
      Common::String _displayName;
      Common::String _path;
      bool _isDirectory;
      bool _isValid;

public:
      /**
       * Creates a N64FilesystemNode with the root node as path.
       */
      N64FilesystemNode();

      /**
       * Creates a N64FilesystemNode for a given path.
       *
       * @param path Common::String with the path the new node should point to.
       * @param verify true if the isValid and isDirectory flags should be verified during the construction.
       */
      N64FilesystemNode(const Common::String &p, bool verify = true);

      virtual bool exists() const;
      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;
      virtual bool isWritable() const;

      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();
};

N64FilesystemNode::N64FilesystemNode() {
      _isDirectory = true;
      _displayName = "Root";
      _isValid = true;
      _path = ROOT_PATH;
}

N64FilesystemNode::N64FilesystemNode(const Common::String &p, bool verify) {
      assert(p.size() > 0);

      _path = p;
      _displayName = lastPathComponent(_path, '/');
      _isValid = true;
      _isDirectory = true;

      // Check if it's a dir
      ROMFILE *tmpfd = romfs_open(p.c_str(), "r");
      if (tmpfd) {
            _isDirectory = (tmpfd->type == 0 || tmpfd->type == 1);
            romfs_close(tmpfd);
      }
}

bool N64FilesystemNode::exists() const {
      int ret = -1;

      ret = romfs_access(_path.c_str(), F_OK);

      return ret == 0;
}

bool N64FilesystemNode::isReadable() const {
      int ret = -1;

      ret = romfs_access(_path.c_str(), R_OK);

      return ret == 0;
}

// We can't write on ROMFS!
bool N64FilesystemNode::isWritable() const {
      return false;
}


AbstractFSNode *N64FilesystemNode::getChild(const Common::String &n) const {
      // FIXME: Pretty lame implementation! We do no error checking to speak
      // of, do not check if this is a special node, etc.
      assert(_isDirectory);

      Common::String newPath(_path);
      if (_path.lastChar() != '/')
            newPath += '/';
      newPath += n;

      return new N64FilesystemNode(newPath, true);
}

bool N64FilesystemNode::getChildren(AbstractFSList &myList, ListMode mode, bool hidden) const {
      assert(_isDirectory);
      ROMDIR *dirp = romfs_opendir(_path.c_str());
      romfs_dirent *dp;

      if (dirp == NULL)
            return false;

      // loop over dir entries using readdir
      while ((dp = romfs_readdir(dirp)) != NULL) {
            // Skip 'invisible' files if necessary
            if (dp->entryname[0] == '.' && !hidden) {
                  free(dp);
                  continue;
            }
            // Skip '.' and '..' to avoid cycles
            if ((dp->entryname[0] == '.' && dp->entryname[1] == 0) || (dp->entryname[0] == '.' && dp->entryname[1] == '.')) {
                  free(dp);
                  continue;
            }

            // Start with a clone of this node, with the correct path set
            N64FilesystemNode entry(*this);
            entry._displayName = dp->entryname;
            if (_path.lastChar() != '/')
                  entry._path += '/';
            entry._path += entry._displayName;

            // Force validity for now...
            entry._isValid = 1;

            entry._isDirectory = (dp->type == 0 || dp->type == 1);

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

                  free(dp);
                  continue;
            }

            myList.push_back(new N64FilesystemNode(entry));

            free(dp);
      }
      romfs_closedir(dirp);

      return true;
}

AbstractFSNode *N64FilesystemNode::getParent() const {
      if (_path == ROOT_PATH)
            return 0;

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

      return new N64FilesystemNode(Common::String(start, end - start), false);
}

Common::SeekableReadStream *N64FilesystemNode::createReadStream() {
      return RomfsStream::makeFromPath(getPath(), false);
}

Common::WriteStream *N64FilesystemNode::createWriteStream() {
      return RomfsStream::makeFromPath(getPath(), true);
}

#endif //#ifdef __N64__


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