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/* 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
 * 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/engines/gob/dataio.h $
 * $Id: dataio.h 30944 2008-02-23 22:50:18Z sev $

#ifndef GOB_DATAIO_H
#define GOB_DATAIO_H

#include "common/endian.h"

#include "common/file.h"

namespace Gob {

#define MAX_FILES 30
#define MAX_DATA_FILES  8
#define MAX_SLOT_COUNT  8

class DataIO;

class DataStream : public Common::SeekableReadStream {
      DataStream(DataIO &io, int16 handle, uint32 dSize, bool dispose = false);
      DataStream(byte *buf, uint32 dSize, bool dispose = true);
      virtual ~DataStream();

      virtual uint32 pos() const;
      virtual uint32 size() const;

      virtual void seek(int32 offset, int whence = SEEK_SET);

      virtual bool eos() const;

      virtual uint32 read(void *dataPtr, uint32 dataSize);

      DataIO *_io;
      int16 _handle;
      uint32 _size;
      byte *_data;
      Common::MemoryReadStream *_stream;
      bool _dispose;

class DataIO {
      struct ChunkDesc {
            char chunkName[13];
            uint32 size;
            uint32 offset;
            byte packed;
            ChunkDesc() : size(0), offset(0), packed(0) { chunkName[0] = 0; }

      int32 unpackData(byte *src, byte *dest);

      void openDataFile(const char *src, bool itk = 0);
      void closeDataFile(bool itk = 0);
      byte *getUnpackedData(const char *name);
      void closeData(int16 handle);
      int16 openData(const char *path,
                  Common::File::AccessMode mode = Common::File::kFileReadMode);
      DataStream *openAsStream(int16 handle, bool dispose = false);

      int32 getDataSize(const char *name);
      byte *getData(const char *path);
      DataStream *getDataStream(const char *path);

      DataIO(class GobEngine *vm);

      Common::File _filesHandles[MAX_FILES];
      struct ChunkDesc *_dataFiles[MAX_DATA_FILES];
      int16 _numDataChunks[MAX_DATA_FILES];
      int16 _dataFileHandles[MAX_DATA_FILES];
      bool _dataFileItk[MAX_DATA_FILES];
      int32 _chunkPos[MAX_SLOT_COUNT * MAX_DATA_FILES];
      int32 _chunkOffset[MAX_SLOT_COUNT * MAX_DATA_FILES];
      int32 _chunkSize[MAX_SLOT_COUNT * MAX_DATA_FILES];
      bool _isCurrentSlot[MAX_SLOT_COUNT * MAX_DATA_FILES];
      int32 _packedSize;

      class GobEngine *_vm;

      int16 file_open(const char *path,
                  Common::File::AccessMode mode = Common::File::kFileReadMode);
      Common::File *file_getHandle(int16 handle);
      const Common::File *file_getHandle(int16 handle) const;

      int16 getChunk(const char *chunkName);
      char freeChunk(int16 handle);
      int32 readChunk(int16 handle, byte *buf, uint16 size);
      int16 seekChunk(int16 handle, int32 pos, int16 from);
      uint32 getChunkPos(int16 handle) const;
      int32 getChunkSize(const char *chunkName);

      uint32 getPos(int16 handle);
      void seekData(int16 handle, int32 pos, int16 from);
      int32 readData(int16 handle, byte *buf, uint16 size);

friend class DataStream;

} // End of namespace Gob

#endif // GOB_DATAIO_H

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