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windows-fs.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2002-2005 The ScummVM project
 *
 * 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.
 *
 * $Header: /cvsroot/scummvm/scummvm/backends/fs/windows/windows-fs.cpp,v 1.31.2.1 2005/10/18 02:11:16 sev Exp $
 */

#ifdef WIN32

#include "common/stdafx.h"
#include "../fs.h"
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <tchar.h>

/*
 * Implementation of the ScummVM file system API based on Windows API.
 */

class WindowsFilesystemNode : public AbstractFilesystemNode {
protected:
      String _displayName;
      bool _isDirectory;
      bool _isValid;
      bool _isPseudoRoot;
      String _path;

public:
      WindowsFilesystemNode();
      WindowsFilesystemNode(const String &path);
      WindowsFilesystemNode(const WindowsFilesystemNode *node);

      virtual String displayName() const { return _displayName; }
      virtual bool isValid() const { return _isValid; }
      virtual bool isDirectory() const { return _isDirectory; }
      virtual String path() const { return _path; }

      virtual FSList listDir(ListMode) const;
      virtual AbstractFilesystemNode *parent() const;

private:
      static char *toAscii(TCHAR *x);
      static const TCHAR* toUnicode(const char *x);
      static void addFile (FSList &list, ListMode mode, const char *base, WIN32_FIND_DATA* find_data);
};


char* WindowsFilesystemNode::toAscii(TCHAR *x) {

#ifndef UNICODE
      return (char*)x;
#else
      static char asciiString[MAX_PATH];
      WideCharToMultiByte(CP_ACP, 0, x, _tcslen(x) + 1, asciiString, sizeof(asciiString), NULL, NULL);
      return asciiString;
#endif
}

const TCHAR* WindowsFilesystemNode::toUnicode(const char *x) {
#ifndef UNICODE
      return (const TCHAR *)x;
#else
      static TCHAR unicodeString[MAX_PATH];
      MultiByteToWideChar(CP_ACP, 0, x, strlen(x) + 1, unicodeString, sizeof(unicodeString) / sizeof(TCHAR));
      return unicodeString;
#endif
}

void WindowsFilesystemNode::addFile(FSList &list, ListMode mode, const char *base, WIN32_FIND_DATA* find_data) {
      WindowsFilesystemNode entry;
      char *asciiName = toAscii(find_data->cFileName);
      bool isDirectory;

      // Skip local directory (.) and parent (..)
      if (!strcmp(asciiName, ".") || !strcmp(asciiName, ".."))
            return;

      isDirectory = (find_data->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY ? true : false);

      if ((!isDirectory && mode == kListDirectoriesOnly) ||
            (isDirectory && mode == kListFilesOnly))
            return;

      entry._isDirectory = isDirectory;
      entry._displayName = asciiName;
      entry._path = base;
      entry._path += asciiName;
      if (entry._isDirectory)
            entry._path += "\\";
      entry._isValid = true;
      entry._isPseudoRoot = false;

      list.push_back(wrap(new WindowsFilesystemNode(&entry)));
}

AbstractFilesystemNode *FilesystemNode::getRoot() {
      return new WindowsFilesystemNode();
}

AbstractFilesystemNode *FilesystemNode::getNodeForPath(const String &path) {
      return new WindowsFilesystemNode(path);
}

WindowsFilesystemNode::WindowsFilesystemNode() {
      _isDirectory = true;
#ifndef _WIN32_WCE
      // Create a virtual root directory for standard Windows system
      _isValid = false;
      _path = "";
      _isPseudoRoot = true;
#else
      _displayName = "Root";
      // No need to create a pseudo root directory on Windows CE
      _isValid = true;
      _path = "\\";
      _isPseudoRoot = false;
#endif
}

WindowsFilesystemNode::WindowsFilesystemNode(const String &p) {
      int len = 0, offset = p.size();

      assert(offset > 0);

      _path = p;

      // Extract last component from path
      const char *str = p.c_str();
      while (offset > 0 && str[offset-1] == '\\')
            offset--;
      while (offset > 0 && str[offset-1] != '\\') {
            len++;
            offset--;
      }
      _displayName = String(str + offset, len);

      // Check whether it is a directory, and whether the file actually exists
      DWORD fileAttribs = GetFileAttributes(toUnicode(_path.c_str()));

      if (fileAttribs == 0xffffffff) {
            _isValid = false;
            _isDirectory = false;
      } else {
            _isValid = true;
            _isDirectory = ((fileAttribs & FILE_ATTRIBUTE_DIRECTORY) != 0);
      }
}

WindowsFilesystemNode::WindowsFilesystemNode(const WindowsFilesystemNode *node) {
      _displayName = node->_displayName;
      _isDirectory = node->_isDirectory;
      _isValid = node->_isValid;
      _isPseudoRoot = node->_isPseudoRoot;
      _path = node->_path;
}

FSList WindowsFilesystemNode::listDir(ListMode mode) const {
      assert(_isDirectory);

      FSList myList;

      if (_isPseudoRoot) {
#ifndef _WIN32_WCE
            // Drives enumeration
            TCHAR drive_buffer[100];
            GetLogicalDriveStrings(sizeof(drive_buffer) / sizeof(TCHAR), drive_buffer);

            for (TCHAR *current_drive = drive_buffer; *current_drive;
                  current_drive += _tcslen(current_drive) + 1) {
                        WindowsFilesystemNode entry;
                        char drive_name[2];

                        drive_name[0] = toAscii(current_drive)[0];
                        drive_name[1] = '\0';
                        entry._displayName = drive_name;
                        entry._isDirectory = true;
                        entry._isValid = true;
                        entry._isPseudoRoot = false;
                        entry._path = toAscii(current_drive);
                        myList.push_back(wrap(new WindowsFilesystemNode(&entry)));
            }
#endif
      }
      else {
            // Files enumeration
            WIN32_FIND_DATA desc;
            HANDLE handle;
            char searchPath[MAX_PATH + 10];

            sprintf(searchPath, "%s*", _path.c_str());

            handle = FindFirstFile(toUnicode(searchPath), &desc);
            if (handle == INVALID_HANDLE_VALUE)
                  return myList;
            addFile(myList, mode, _path.c_str(), &desc);
            while (FindNextFile(handle, &desc))
                  addFile(myList, mode, _path.c_str(), &desc);

            FindClose(handle);
      }

      return myList;
}

const char *lastPathComponent(const Common::String &str) {
      const char *start = str.c_str();
      const char *cur = start + str.size() - 2;

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

      return cur + 1;
}

AbstractFilesystemNode *WindowsFilesystemNode::parent() const {
      assert(_isValid || _isPseudoRoot);
      if (_isPseudoRoot)
            return 0;
      WindowsFilesystemNode *p = new WindowsFilesystemNode();
      if (_path.size() > 3) {
            const char *start = _path.c_str();
            const char *end = lastPathComponent(_path);

            p = new WindowsFilesystemNode();
            p->_path = String(start, end - start);
            p->_isValid = true;
            p->_isDirectory = true;
            p->_displayName = lastPathComponent(p->_path);
            p->_isPseudoRoot = false;
      }
      return p;
}

#endif // WIN32

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