/******************************************************************************
**  libDXFrw - Library to read/write DXF files (ascii & binary)              **
**                                                                           **
**  Copyright (C) 2011-2015 José F. Soriano, rallazz@gmail.com               **
**                                                                           **
**  This library is free software, licensed 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.  **
**  You should have received a copy of the GNU General Public License        **
**  along with this program.  If not, see <http://www.gnu.org/licenses/>.    **
******************************************************************************/

#ifndef DWGUTIL_H
#define DWGUTIL_H

#include "../drw_base.h"

namespace DRW
{
  std::string toHexStr( int n );
}

class dwgRSCodec
{
  public:
    dwgRSCodec() {}

    static void decode239I( duint8 *in, duint8 *out, duint32 blk );
    static void decode251I( duint8 *in, duint8 *out, duint32 blk );
};

class dwgCompressor
{
  public:
    dwgCompressor()
      : bufC( nullptr )
      , bufD( nullptr )
      , sizeC( 0 )
      , sizeD( 0 )
      , pos( 0 )
      , rpos( 0 )
    {}

    void decompress18( duint8 *cbuf, duint8 *dbuf, duint32 csize, duint32 dsize );
    static void decrypt18Hdr( duint8 *buf, duint32 size, duint32 offset );
//  static void decrypt18Data(duint8 *buf, duint32 size, duint32 offset);
    static void decompress21( duint8 *cbuf, duint8 *dbuf, duint32 csize, duint32 dsize );

  private:
    duint32 litLength18();
    static duint32 litLength21( duint8 *cbuf, duint8 oc, duint32 *si );
    static void copyCompBytes21( duint8 *cbuf, duint8 *dbuf, duint32 l, duint32 si, duint32 di );
    static void readInstructions21( duint8 *cbuf, duint32 *si, duint8 *oc, duint32 *so, duint32 *l );

    duint32 longCompressionOffset();
    duint32 long20CompressionOffset();
    duint32 twoByteOffset( duint32 *ll );

    duint8 *bufC = nullptr;
    duint8 *bufD = nullptr;
    duint32 sizeC;
    duint32 sizeD;
    duint32 pos;
    duint32 rpos;

};

class secEnum
{
  public:
    enum DWGSection
    {
      UNKNOWNS,        //!< UNKNOWN section.
      FILEHEADER,      //!< File Header (in R3-R15
      HEADER,          //!< AcDb:Header
      CLASSES,         //!< AcDb:Classes
      SUMMARYINFO,     //!< AcDb:SummaryInfo
      PREVIEW,         //!< AcDb:Preview
      VBAPROY,         //!< AcDb:VBAProject
      APPINFO,         //!< AcDb:AppInfo
      FILEDEP,         //!< AcDb:FileDepList
      REVHISTORY,      //!< AcDb:RevHistory
      SECURITY,        //!< AcDb:Security
      OBJECTS,         //!< AcDb:AcDbObjects
      OBJFREESPACE,    //!< AcDb:ObjFreeSpace
      TEMPLATE,        //!< AcDb:Template
      HANDLES,         //!< AcDb:Handles
      PROTOTYPE,       //!< AcDb:AcDsPrototype_1b
      AUXHEADER,       //!< AcDb:AuxHeader, in (R13-R15) second file header
      SIGNATURE,       //!< AcDb:Signature
      APPINFOHISTORY,  //!< AcDb:AppInfoHistory (in ac1021 may be a renamed section?
      EXTEDATA,        //!< Extended Entity Data
      PROXYGRAPHICS    //!< PROXY ENTITY GRAPHICS
    };

    secEnum() {}

    static DWGSection getEnum( std::string nameSec );
};

#endif // DWGUTIL_H