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ps2-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-0-13-0/backends/fs/ps2/ps2-fs.cpp $
 * $Id: ps2-fs.cpp 35648 2009-01-01 15:06:43Z sev $
 */

#include "backends/fs/abstract-fs.h"
#include "backends/fs/stdiostream.h"
#include <kernel.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "backends/platform/ps2/asyncfio.h"
#include "backends/platform/ps2/fileio.h"
#include "backends/platform/ps2/systemps2.h"
#include "backends/platform/ps2/ps2debug.h"

#define DEFAULT_MODE (FIO_S_IRUSR | FIO_S_IWUSR | FIO_S_IRGRP | FIO_S_IWGRP | FIO_S_IROTH | FIO_S_IWOTH)

extern AsyncFio fio;
extern OSystem_PS2 *g_systemPs2;

/**
 * Implementation of the ScummVM file system API based on the Ps2SDK.
 *
 * Parts of this class are documented in the base interface class, AbstractFSNode.
 */
00046 class Ps2FilesystemNode : public AbstractFSNode {

friend class Ps2FilesystemFactory;

protected:
      Common::String _displayName;
      Common::String _path;
      bool _isDirectory;
      bool _isRoot;

private:
      char *getDeviceDescription(const char *path) const;
      bool getDirectoryFlag(const char *path);

public:
      /**
       * Creates a PS2FilesystemNode with the root node as path.
       */
      Ps2FilesystemNode();

      /**
       * Creates a PS2FilesystemNode for a given path.
       *
       * @param path Common::String with the path the new node should point to.
       */
      Ps2FilesystemNode(const Common::String &path);
      Ps2FilesystemNode(const Common::String &path, bool verify);

      /**
       * Copy constructor.
       */
      Ps2FilesystemNode(const Ps2FilesystemNode *node);

      virtual bool exists(void) const;

00081       virtual Common::String getDisplayName() const { return _displayName; }
00082       virtual Common::String getName() const { return _displayName; }
00083       virtual Common::String getPath() const { return _path; }

00085       virtual bool isDirectory() const {
            return _isDirectory;
      }

00089       virtual bool isReadable() const {
            return exists();
      }

00093       virtual bool isWritable() const {
            // The only writable device on the ps2 is the memory card
            return false;
      }

      virtual AbstractFSNode *clone() const { return new Ps2FilesystemNode(this); }
      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 *openForReading();
      virtual Common::WriteStream *openForWriting();
};

00107 Ps2FilesystemNode::Ps2FilesystemNode() {
      _isDirectory = true;
      _isRoot = true;
      _displayName = "PlayStation 2";
      _path = "";
}

00114 Ps2FilesystemNode::Ps2FilesystemNode(const Common::String &path) {
      _path = path;
      _isDirectory = true;
      if (strcmp(path.c_str(), "") == 0) {
            _isRoot = true;
            _displayName = Common::String("PlayStation 2");
      } else {
            _isRoot = false;
            const char *dsplName = NULL, *pos = path.c_str();
            while (*pos)
                  if (*pos++ == '/')
                        dsplName = pos;
            if (dsplName)
                  _displayName = Common::String(dsplName);
            else
                  _displayName = getDeviceDescription(path.c_str());
      }
}

Ps2FilesystemNode::Ps2FilesystemNode(const Common::String &path, bool verify) {
      _path = path;

      if (strcmp(path.c_str(), "") == 0) {
            _isRoot = true; /* root is always a dir*/
            _displayName = Common::String("PlayStation 2");
            _isDirectory = true;
      } else {
            _isRoot = false;
            const char *dsplName = NULL, *pos = path.c_str();
            while (*pos)
                  if (*pos++ == '/')
                        dsplName = pos;

            if (dsplName) {
                  _displayName = Common::String(dsplName);
                  if (verify)
                        _isDirectory = getDirectoryFlag(path.c_str());
                  else
                        _isDirectory = false;
            } else {
                  _displayName = getDeviceDescription(path.c_str());
                  _isDirectory = true; /* devices are always dir */
            }
      }
}

00160 Ps2FilesystemNode::Ps2FilesystemNode(const Ps2FilesystemNode *node) {
      _displayName = node->_displayName;
      _isDirectory = node->_isDirectory;
      _path = node->_path;
      _isRoot = node->_isRoot;
}

bool Ps2FilesystemNode::exists(void) const {

      dbg_printf("Ps2FilesystemNode::exists: path \"%s\": ", _path.c_str());

      if (_path[4] != ':') { // don't bother for relative path... they always fail on PS2!
            dbg_printf("NO, relative path\n");
            return false;
      }

      if (_path[0] == 'h') { // bypass host
            dbg_printf("NO, host device ignored\n");
            return false;
      }

      int fd = fio.open(_path.c_str(), O_RDONLY);
      if (fd == -EISDIR) {
            dbg_printf("YES, directory\n");
            return true;
      } else if (fd >= 0) {
            dbg_printf("YES, file\n");
            fio.close(fd);
            return true;
      }

      printf("NO, not found\n");
      return false;
}

bool Ps2FilesystemNode::getDirectoryFlag(const char *path) {
      if (strncmp(path, "host:", 5) == 0)
            return true;      // Can't get listings from host: right now

      int fd = fio.open(_path.c_str(), O_RDONLY);

      if (fd == -EISDIR) {
            dbg_printf(" romeo : new node [ %s ] is a dir\n", path);
            return true;
      } else if (fd >=0) {
            dbg_printf(" romeo : new node [ %s ] is -not- a dir (%d)\n", path, fd);
            fio.close(fd);
      } else
            dbg_printf(" romeo : new node [ %s ] is -not- (%d)\n", path, fd);

      return false;
}

00213 AbstractFSNode *Ps2FilesystemNode::getChild(const Common::String &n) const {
      if (!_isDirectory)
            return NULL;

      char listDir[256];
      sprintf(listDir, "%s/", _path.c_str());
      int fd = fio.dopen(listDir);

      if (fd >= 0) {
            iox_dirent_t dirent;

            while (fio.dread(fd, &dirent) > 0) {
                  if (strcmp(n.c_str(), dirent.name) == 0) {
                        Ps2FilesystemNode *dirEntry = new Ps2FilesystemNode();

                        dirEntry->_isDirectory = (bool)(dirent.stat.mode & FIO_S_IFDIR);
                        dirEntry->_isRoot = false;

                        dirEntry->_path = _path;
                        dirEntry->_path += "/";
                        dirEntry->_path += dirent.name;

                        dirEntry->_displayName = dirent.name;

                        fio.dclose(fd);
                        return dirEntry;
                  }
            }
            fio.dclose(fd);
      }

      return NULL;
}

00247 bool Ps2FilesystemNode::getChildren(AbstractFSList &list, ListMode mode, bool hidden) const {
      //TODO: honor the hidden flag

      if (!_isDirectory)
            return false;

      if (_isRoot) {
            Ps2FilesystemNode dirEntry;
            dirEntry._isDirectory = true;
            dirEntry._isRoot = false;
            dirEntry._path = "cdfs:";
            dirEntry._displayName = getDeviceDescription(dirEntry._path.c_str());
            list.push_back(new Ps2FilesystemNode(&dirEntry));

            if (g_systemPs2->hddPresent()) {
                  dirEntry._path = "pfs0:";
                  dirEntry._displayName = getDeviceDescription(dirEntry._path.c_str());
                  list.push_back(new Ps2FilesystemNode(&dirEntry));
            }

            if (g_systemPs2->usbMassPresent()) {
                  dirEntry._path = "mass:";
                  dirEntry._displayName = getDeviceDescription(dirEntry._path.c_str());
                  list.push_back(new Ps2FilesystemNode(&dirEntry));
            }
            return true;
      } else {
            char listDir[256];
            int fd;

            if (_path.lastChar() == '/' /* || _path.lastChar() == ':'*/)
                  fd = fio.dopen(_path.c_str());
            else {
                  sprintf(listDir, "%s/", _path.c_str());
                  fd = fio.dopen(listDir);
            }

            if (fd >= 0) {
                  iox_dirent_t dirent;
                  Ps2FilesystemNode dirEntry;
                  int dreadRes;
                  while ((dreadRes = fio.dread(fd, &dirent)) > 0) {
                        if (dirent.name[0] == '.')
                              continue; // ignore '.' and '..'
                        if (((mode == Common::FSNode::kListDirectoriesOnly) && (dirent.stat.mode & FIO_S_IFDIR)) ||
                              ((mode == Common::FSNode::kListFilesOnly) && !(dirent.stat.mode & FIO_S_IFDIR)) ||
                              (mode == Common::FSNode::kListAll)) {

                              dirEntry._isDirectory = (bool)(dirent.stat.mode & FIO_S_IFDIR);
                              dirEntry._isRoot = false;

                              dirEntry._path = _path;
                              if (_path.lastChar() != '/')
                                    dirEntry._path += "/";
                              dirEntry._path += dirent.name;

                              dirEntry._displayName = dirent.name;

                              list.push_back(new Ps2FilesystemNode(&dirEntry));
                        }
                  }
                  fio.dclose(fd);
                  return true;
            } else
                  return false;
      }
}

00315 AbstractFSNode *Ps2FilesystemNode::getParent() const {
      if (_isRoot)
            return new Ps2FilesystemNode(this);

      const char *slash = NULL;
      const char *cnt = _path.c_str();

      while (*cnt) {
            if (*cnt == '/')
                  slash = cnt;
            cnt++;
      }

      if (slash)
            return new Ps2FilesystemNode(Common::String(_path.c_str(), slash - _path.c_str()));
      else
            return new Ps2FilesystemNode();
}


char *Ps2FilesystemNode::getDeviceDescription(const char *path) const {
      if (strncmp(path, "cdfs", 4) == 0)
            return "DVD Drive";
      else if (strncmp(path, "mass", 4) == 0)
            return "USB Mass Storage";
      else
            return "Harddisk";
}

00344 Common::SeekableReadStream *Ps2FilesystemNode::openForReading() {
      return StdioStream::makeFromPath(getPath().c_str(), false);
}

00348 Common::WriteStream *Ps2FilesystemNode::openForWriting() {
      return StdioStream::makeFromPath(getPath().c_str(), true);
}

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