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wii-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.
 *
 */

#if defined(__WII__)

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

#include <sys/iosupport.h>
#include <sys/dir.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

#include <gctypes.h>

#ifdef USE_WII_DI
#include <di/di.h>
#endif

/**
 * Implementation of the ScummVM file system API based on Wii.
 *
 * Parts of this class are documented in the base interface class, AbstractFSNode.
 */
class WiiFilesystemNode : public AbstractFSNode {
protected:
      Common::String _displayName;
      Common::String _path;
      bool _exists, _isDirectory, _isReadable, _isWritable;

      virtual void initRootNode();
      virtual bool getDevopChildren(AbstractFSList &list, ListMode mode, bool hidden) const;
      virtual void setFlags(const struct stat *st);
      virtual void clearFlags();

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

      /**
       * Creates a WiiFilesystemNode for a given path.
       *
       * @param path Common::String with the path the new node should point to.
       */
      WiiFilesystemNode(const Common::String &path);
      WiiFilesystemNode(const Common::String &p, const struct stat *st);

      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 { return _isReadable; }
      virtual bool isWritable() const { return _isWritable; }

      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();

      static void asyncHandler(bool umount, const Common::String *path);
};

void WiiFilesystemNode::asyncHandler(bool mount, const Common::String *path) {
#ifdef USE_WII_DI
      static bool di_tryMount = true;
      static bool di_isMounted = false;

      // umount not required filesystems
      if (!mount) {
            if (di_isMounted && (!path || (path && !path->hasPrefix("dvd:/")))) {
                  printf("umount ISO9660\n");
                  ISO9660_Unmount();
                  DI_StopMotor();
                  di_tryMount = false;
                  di_isMounted = false;
            }

            if (!path)
                  return;
      }

      // re-mount DVD if data from its path has been requested. in this case, we
      // have to wait for DI_Mount() to finish
      if (!di_tryMount && !di_isMounted && path && path->hasPrefix("dvd:/")) {
            printf("remount ISO9660\n");
            DI_Mount();

            while (DI_GetStatus() & DVD_INIT)
                  usleep(20 * 1000);

            di_tryMount = true;
      }

      if (!di_tryMount)
            return;

      // check if the async DI_Mount() call has finished
      if (DI_GetStatus() & DVD_READY) {
            di_tryMount = false;

            printf("mount ISO9660\n");
            if (ISO9660_Mount()) {
                  di_isMounted = true;
                  printf("ISO9660 mounted\n");
            } else {
                  DI_StopMotor();
                  printf("ISO9660 mount failed\n");
            }
      }
#endif
}

// gets all registered devoptab devices
bool WiiFilesystemNode::getDevopChildren(AbstractFSList &list, ListMode mode, bool hidden) const {
      u8 i;
      const devoptab_t* dt;

      if (mode == Common::FSNode::kListFilesOnly)
            return true;

      asyncHandler(true, NULL);

      // skip in, out and err
      for (i = 3; i < STD_MAX; ++i) {
            dt = devoptab_list[i];

            if (!dt || !dt->name || !dt->open_r || !dt->diropen_r)
                  continue;

            list.push_back(new WiiFilesystemNode(Common::String(dt->name) + ":/"));
      }

      return true;
}

void WiiFilesystemNode::initRootNode() {
      _path.clear();
      _displayName = "<devices>";

      _exists = true;
      _isDirectory = true;
      _isReadable = false;
      _isWritable = false;
}

void WiiFilesystemNode::clearFlags() {
      _exists = false;
      _isDirectory = false;
      _isReadable = false;
      _isWritable = false;
}

void WiiFilesystemNode::setFlags(const struct stat *st) {
      _exists = true;
      _isDirectory = S_ISDIR(st->st_mode);
      _isReadable = (st->st_mode & S_IRUSR) > 0;
      _isWritable = (st->st_mode & S_IWUSR) > 0;
}

WiiFilesystemNode::WiiFilesystemNode() {
      initRootNode();
}

WiiFilesystemNode::WiiFilesystemNode(const Common::String &p) {
      if (p.empty()) {
            initRootNode();
            return;
      }

      _path = Common::normalizePath(p, '/');

      // "fat:" is not a valid directory, but "fat:/" is
      if (_path.lastChar() == ':')
            _path += '/';

      _displayName = lastPathComponent(_path, '/');

      asyncHandler(true, &_path);

      struct stat st;
      if (!stat(_path.c_str(), &st))
            setFlags(&st);
      else
            clearFlags();
}

WiiFilesystemNode::WiiFilesystemNode(const Common::String &p, const struct stat *st) {
      if (p.empty()) {
            initRootNode();
            return;
      }

      _path = Common::normalizePath(p, '/');

      // "fat:" is not a valid directory, but "fat:/" is
      if (_path.lastChar() == ':')
            _path += '/';

      _displayName = lastPathComponent(_path, '/');

      setFlags(st);
}

bool WiiFilesystemNode::exists() const {
      return _exists;
}

AbstractFSNode *WiiFilesystemNode::getChild(const Common::String &n) const {
      assert(_isDirectory);

      assert(!n.contains('/'));

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

      return new WiiFilesystemNode(newPath);
}

bool WiiFilesystemNode::getChildren(AbstractFSList &list, ListMode mode, bool hidden) const {
      assert(_isDirectory);

      if (_path.empty())
            return getDevopChildren(list, mode, hidden);

      DIR_ITER* dp = diropen (_path.c_str());

      if (dp == NULL)
            return false;

      char filename[MAXPATHLEN];
      struct stat st;

      while (dirnext(dp, filename, &st) == 0) {
            if (strcmp(filename, ".") == 0 || strcmp(filename, "..") == 0)
                  continue;

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

            bool isDir = S_ISDIR(st.st_mode);

            if ((mode == Common::FSNode::kListFilesOnly && isDir) ||
                  (mode == Common::FSNode::kListDirectoriesOnly && !isDir))
                  continue;

            list.push_back(new WiiFilesystemNode(newPath, &st));
      }

      dirclose(dp);

      return true;
}

AbstractFSNode *WiiFilesystemNode::getParent() const {
      if (_path.empty())
            return NULL;

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

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

Common::SeekableReadStream *WiiFilesystemNode::createReadStream() {
      return StdioStream::makeFromPath(getPath().c_str(), false);
}

Common::WriteStream *WiiFilesystemNode::createWriteStream() {
      return StdioStream::makeFromPath(getPath().c_str(), true);
}

#endif //#if defined(__WII__)


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