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windows-fs.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2002-2006 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.
 *
 * $URL: https://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/backends/fs/windows/windows-fs.cpp $
 * $Id: windows-fs.cpp 22923 2006-06-05 00:14:23Z kirben $
 */

#ifdef WIN32

#include "common/stdafx.h"
#include "backends/fs/abstract-fs.h"
#include "backends/fs/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);

      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 bool listDir(AbstractFSList &list, ListMode mode) const;
      virtual AbstractFilesystemNode *parent() const;
      virtual AbstractFilesystemNode *child(const String &name) const;

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


static 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;
}

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(AbstractFSList &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 == FilesystemNode::kListDirectoriesOnly) ||
            (isDirectory && mode == FilesystemNode::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(new WindowsFilesystemNode(entry));
}

AbstractFilesystemNode *AbstractFilesystemNode::getCurrentDirectory() {
      char path[MAX_PATH];
      GetCurrentDirectory(MAX_PATH, path);

      // Add a trailing slash, if necessary.
      if (path[0] != 0) {
            if (path[strlen(path) - 1] != '\\')
                  strcat(path, "\\");
      }

      return new WindowsFilesystemNode(path);
}

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

AbstractFilesystemNode *AbstractFilesystemNode::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) {
      assert(p.size() > 0);

      _path = p;
      _displayName = lastPathComponent(_path);

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

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

bool WindowsFilesystemNode::listDir(AbstractFSList &myList, ListMode mode) const {
      assert(_isDirectory);

      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(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 false;
            addFile(myList, mode, _path.c_str(), &desc);
            while (FindNextFile(handle, &desc))
                  addFile(myList, mode, _path.c_str(), &desc);

            FindClose(handle);
      }

      return true;
}

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;
}

AbstractFilesystemNode *WindowsFilesystemNode::child(const String &name) const {
      assert(_isDirectory);
      String newPath(_path);
      if (_path.lastChar() != '\\')
            newPath += '\\';
      newPath += name;

      // Check whether the directory actually exists
      DWORD fileAttribs = GetFileAttributes(toUnicode(newPath.c_str()));
      if (fileAttribs == INVALID_FILE_ATTRIBUTES)
            return 0;

      WindowsFilesystemNode *p = new WindowsFilesystemNode(newPath);
      return p;
}

#endif // WIN32

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