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psp-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-1-0-0rc1/backends/fs/psp/psp-fs.cpp $
 * $Id: psp-fs.cpp 43493 2009-08-17 20:10:00Z joostp $
 */

#ifdef __PSP__

#include "engines/engine.h"
#include "backends/fs/abstract-fs.h"
#include "backends/fs/psp/psp-stream.h"
#include "backends/platform/psp/powerman.h"

#include <sys/stat.h>
#include <unistd.h>

#include <pspkernel.h>

#define     ROOT_PATH   "ms0:/"

#include "backends/platform/psp/trace.h"


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

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

      /**
       * Creates a PSPFilesystemNode 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.
       */
      PSPFilesystemNode(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();
};

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

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

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

      if (verify) {
            struct stat st;
            PowerMan.beginCriticalSection();
            _isValid = (0 == stat(_path.c_str(), &st));
            PowerMan.endCriticalSection();
            _isDirectory = S_ISDIR(st.st_mode);
      }
}

bool PSPFilesystemNode::exists() const {
      int ret = 0;

      PowerMan.beginCriticalSection();    // Make sure to block in case of suspend
      ret = access(_path.c_str(), F_OK);
      PowerMan.endCriticalSection();
      
      return ret == 0;
}

bool PSPFilesystemNode::isReadable() const {
      int ret = 0;

      PowerMan.beginCriticalSection();    // Make sure to block in case of suspend
      ret = access(_path.c_str(), R_OK);
      PowerMan.endCriticalSection();
      
      return ret == 0;
}

bool PSPFilesystemNode::isWritable() const {
      int ret = 0;

      PowerMan.beginCriticalSection();    // Make sure to block in case of suspend
      ret = access(_path.c_str(), W_OK);
      PowerMan.endCriticalSection();
      
      return ret == 0;
}


AbstractFSNode *PSPFilesystemNode::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 PSPFilesystemNode(newPath, true);
}

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

      //TODO: honor the hidden flag

      bool ret = true;

      PowerMan.beginCriticalSection();    // Make sure to block in case of suspend
      
      int dfd  = sceIoDopen(_path.c_str());
      if (dfd > 0) {
            SceIoDirent dir;
            memset(&dir, 0, sizeof(dir));

            while (sceIoDread(dfd, &dir) > 0) {
                  // Skip 'invisible files
                  if (dir.d_name[0] == '.')
                        continue;

                  PSPFilesystemNode entry;

                  entry._isValid = true;
                  entry._displayName = dir.d_name;

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

                  entry._path = newPath;
                  entry._isDirectory = dir.d_stat.st_attr & FIO_SO_IFDIR;

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

                  myList.push_back(new PSPFilesystemNode(entry));
            }

            sceIoDclose(dfd);
            ret = true;
      } else { // dfd <= 0
            ret = false;
      }

      PowerMan.endCriticalSection();
      return ret;
}

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

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

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

Common::SeekableReadStream *PSPFilesystemNode::createReadStream() {
      return PSPIoStream::makeFromPath(getPath(), false);
}

Common::WriteStream *PSPFilesystemNode::createWriteStream() {
      return PSPIoStream::makeFromPath(getPath(), true);
}

#endif //#ifdef __PSP__

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