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barchive.h

/* 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-1-2-0/engines/draci/barchive.h $
 * $Id: barchive.h 45616 2009-11-02 21:54:57Z fingolfin $
 *
 */

#ifndef DRACI_BARCHIVE_H
#define DRACI_BARCHIVE_H

#include "common/str.h"
#include "common/file.h"

namespace Draci {

/**
 *  Represents individual files inside the archive.
 */
00037 struct BAFile {
00038       uint _compLength; ///< Compressed length (the same as _length if the file is uncompressed)
00039       uint _length;     ///< Uncompressed length
00040       uint32 _offset;   ///< Offset of file inside archive
      byte *_data;
      byte _crc;
00043       byte _stopper;    ///< Not used in BAR files, needed for DFW

      /** Releases the file data (for memory considerations) */
00046       void close() {
            delete[] _data;
            _data = NULL;
      }
};

class BArchive {
public:
      BArchive() : _files(NULL), _fileCount(0), _opened(false) {}

      BArchive(const Common::String &path) :
      _files(NULL), _fileCount(0), _opened(false) {
            openArchive(path);
      }

      ~BArchive() { closeArchive(); }

      void openArchive(const Common::String &path);
      void closeArchive();
      uint size() const { return _fileCount; }

      /**
       * Checks whether there is an archive opened. Should be called before reading
       * from the archive to check whether openArchive() succeeded.
       */
      bool isOpen() const { return _opened; }

      void clearCache();

      const BAFile *getFile(uint i);

private:
      // Archive header data
      static const char _magicNumber[];
      static const char _dfwMagicNumber[];
      static const uint _archiveHeaderSize = 10;

      // File stream header data
      static const uint _fileHeaderSize = 6;

      Common::String _path;    ///< Path to file
      BAFile *_files;          ///< Internal array of files
      uint _fileCount;         ///< Number of files in archive
      bool _isDFW;             ///< True if the archive is in DFW format, false otherwise
      bool _opened;            ///< True if the archive is opened, false otherwise
      Common::File _f;         ///< Opened file handle

      void openDFW(const Common::String &path);
      BAFile *loadFileDFW(uint i);
      BAFile *loadFileBAR(uint i);
};

} // End of namespace Draci

#endif // DRACI_BARCHIVE_H

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