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gp32-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-0-11-1/backends/fs/gp32/gp32-fs.cpp $
 * $Id: gp32-fs.cpp 30944 2008-02-23 22:50:18Z sev $
 *
 */

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

#define MAX_PATH_SIZE 256

/**
 * Implementation of the ScummVM file system API.
 * 
 * Parts of this class are documented in the base interface class, AbstractFilesystemNode.
 */
00035 class GP32FilesystemNode : public AbstractFilesystemNode {
protected:
      String _displayName;
      String _path;
      bool _isDirectory;
      bool _isRoot;

public:
      /**
       * Creates a GP32FilesystemNode with the root node as path.
       */
      GP32FilesystemNode();
      
      /**
       * Creates a GP32FilesystemNode for a given path.
       * 
       * @param path String with the path the new node should point to.
       */
      GP32FilesystemNode(const String &path);

      virtual bool exists() const { return true; }          //FIXME: this is just a stub
00056       virtual String getDisplayName() const { return _displayName; }
00057       virtual String getName() const { return _displayName; }
00058       virtual String getPath() const { return _path; }
00059       virtual bool isDirectory() const { return _isDirectory; }
      // FIXME: isValid should return false if this Node can't be used!
      // so client code can rely on the return value.
00062       virtual bool isReadable() const { return true; }      //FIXME: this is just a stub
00063       virtual bool isWritable() const { return true; }      //FIXME: this is just a stub

      virtual AbstractFilesystemNode *getChild(const String &n) const;
      virtual bool getChildren(AbstractFSList &list, ListMode mode, bool hidden) const;
      virtual AbstractFilesystemNode *getParent() const;
};

const char gpRootPath[] = "gp:\\";
//char gpCurrentPath[MAX_PATH_SIZE] = "gp:\\";        // must end with '\'

/**
 * Returns the last component of a given path.
 * 
 * Examples:
 *                gp:\foo\bar.txt would return "\bar.txt"
 *                gp:\foo\bar\    would return "\bar\"
 *  
 * @param str Path to obtain the last component from.
 * @return Pointer to the first char of the last component inside str.
 */
const char *lastPathComponent(const Common::String &str) {
      if(str.empty())
            return "";
      
      const char *start = str.c_str();
      const char *cur = start + str.size() - 2;

      while (cur >= start && *cur != '\\') {
            --cur;
      }

      return cur + 1;
}

/**
 * FIXME: document this function.
 * 
 * @param path
 * @param convPath
 */
int gpMakePath(const char *path, char *convPath) {
      // copy root or current directory
      const char *p;
      if ((*path == '/') || (*path == '\\')) {
            path++;
            p = gpRootPath;
            while (*p)
                  *convPath++ = *p++;
      }// else
      //    p = gpCurrentPath;

      //while (*p)
      //    *convPath++ = *p++;

      // add filenames/directories. remove "." & "..", replace "/" with "\"
      do {
            switch (*path) {
            case 0:
            case '/':
            case '\\':
                  if (*(convPath - 1) == '\\') {
                        // already ends with '\'
                  } else if ((*(convPath - 2) == '\\') && (*(convPath - 1) == '.')) {
                        convPath--; // remove '.' and end with '\'
                  } else if ((*(convPath - 3) == '\\') && (*(convPath - 2) == '.') && (*(convPath - 1) == '.')) {
                        convPath -= 3;    // remove "\.."
                        if (*(convPath - 1) == ':')
                              *convPath++ = '\\';     // "gp:" -> "gp:\"
                        else
                              while (*(convPath - 1) != '\\')
                                    convPath--; // remove one directory and end with '\'
                  } else {
                        *convPath++ = '\\';     // just add '\'
                  }
                  break;

            default:
                  *convPath++ = *path;
                  break;
            }
      } while (*path++);

      *convPath = '\\';

      //  *--convPath = 0;    // remove last '\' and null-terminate
      *convPath = 0;    // remove last '\' and null-terminate

      return 0;
}

00153 GP32FilesystemNode::GP32FilesystemNode() {
      _isDirectory = true;
      _isRoot = true;
      _displayName = "GP32 Root";
      _path = "gp:\\";
}

00160 GP32FilesystemNode::GP32FilesystemNode(const String &path) {
      const char *dsplName = NULL, *pos = NULL;
      char convPath[256];

      gpMakePath(path.c_str(), convPath);

      _path = convPath;
      pos = convPath;
      
      while (*pos)
            if (*pos++ == '\\')
                  dsplName = pos;

      BP("FS: path name: %s", path.c_str());

      if (strcmp(path.c_str(), "gp:\\") == 0) {
            _isRoot = true;
            _displayName = "GP32 Root";
      } else {
            _isRoot = false;
            _displayName = String(dsplName);
      }
      _isDirectory = true;
}

AbstractFilesystemNode *GP32FilesystemNode::getChild(const 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);
      
      String newPath(_path);
      if (_path.lastChar() != '\\')
            newPath += '\\';
      newPath += n;

      return new GP32FilesystemNode(newPath);
}

00198 bool GP32FilesystemNode::getChildren(AbstractFSList &myList, ListMode mode, bool hidden) const {
      assert(_isDirectory);

      //TODO: honor the hidden flag

      GPDIRENTRY dirEntry;
      GPFILEATTR attr;
      GP32FilesystemNode entry;
      uint32 read;

      if (mode == FilesystemNode::kListAll)
            LP("listDir(kListAll)");
      else
            LP("listDir(kListDirectoriesOnly)");

      int startIdx = 0; // current file
      String listDir(_path);
      //listDir += "/";
      
      while (GpDirEnumList(listDir.c_str(), startIdx++, 1, &dirEntry, &read)  == SM_OK) {
da                if (dirEntry.name[0] == '.')
                  continue;
                  
            entry._displayName = dirEntry.name;
            entry._path = _path;
            entry._path += dirEntry.name;
            entry._isRoot = false;

            GpFileAttr(entry._path.c_str(), &attr);
            entry._isDirectory = attr.attr & (1 << 4);

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

            if (entry._isDirectory)
                  entry._path += "\\";
            myList.push_back(new GP32FilesystemNode(entry));
      }

      BP("Dir... %s", listDir.c_str());

      return true;
}

00244 AbstractFilesystemNode *GP32FilesystemNode::getParent() const {
      if (_isRoot)
            return 0;

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

      GP32FilesystemNode *p = new GP32FilesystemNode(String(start, end - start));

      NP("%s", p->_path.c_str());

      return p;
}

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