file.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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef SCUMM_FILE_H
#define SCUMM_FILE_H

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

#include "scumm/detection.h"

namespace Scumm {

class ScummEngine;

class BaseScummFile : public Common::SeekableReadStream {
protected:
    byte _encbyte;
    Common::ScopedPtr<Common::SeekableReadStream> _baseStream;
    Common::String _debugName;

public:
    BaseScummFile() : _encbyte(0) {}
    void setEnc(byte value) { _encbyte = value; }

    virtual bool open(const Common::Path &filename) = 0;
    virtual bool openSubFile(const Common::Path &filename) = 0;
    virtual void close();

    int64 pos() const override = 0;
    int64 size() const override = 0;
    bool seek(int64 offs, int whence = SEEK_SET) override = 0;

    Common::String getDebugName() const { return _debugName; }

    bool isOpen() const { return !!_baseStream; }

// Unused
#if 0
    virtual bool eos() const = 0;
    virtual uint32 read(void *dataPtr, uint32 dataSize) = 0;
#endif
};

class ScummFile : public BaseScummFile {
protected:
    int32   _subFileStart;
    int32   _subFileLen;
    bool    _myEos; // Have we read past the end of the subfile?
    bool    _isMac;

    void setSubfileRange(int32 start, int32 len);
    void resetSubfile();

public:
    explicit ScummFile(const ScummEngine *vm);

    bool open(const Common::Path &filename) override;
    bool openSubFile(const Common::Path &filename) override;

    void clearErr() override { _myEos = false; BaseScummFile::clearErr(); }

    bool eos() const override;
    int64 pos() const override;
    int64 size() const override;
    bool seek(int64 offs, int whence = SEEK_SET) override;
    uint32 read(void *dataPtr, uint32 dataSize) override;
};

class ScummDiskImage : public BaseScummFile {
private:
    Common::SeekableReadStream *_stream;
    byte _roomDisks[59] = {}, _roomTracks[59] = {}, _roomSectors[59] = {};

    byte *_buf = nullptr;

    const GameSettings _game;

    const Common::String _disk1, _disk2;
    int _openedDisk = 0;

    int _numGlobalObjects = 0;
    int _numRooms = 0;
    int _numCostumes = 0;
    int _numScripts = 0;
    int _numSounds = 0;
    const int *_resourcesPerFile;

    bool openDisk(char num);

    bool generateIndex();
    bool generateResource(int res);

    uint16 extractIndex(Common::WriteStream *out);
    uint16 extractResource(Common::WriteStream *out, int res);

    byte fileReadByte();
    uint16 fileReadUint16LE();

public:
    ScummDiskImage(const char *disk1, const char *disk2, GameSettings game);

    bool open(const Common::Path &filename) override;
    bool openSubFile(const Common::Path &filename) override;

    void close() override;
    bool eos() const override { return _stream->eos(); }
    int64 pos() const override { return _stream->pos(); }
    int64 size() const override { return _stream->size(); }
    bool seek(int64 offs, int whence = SEEK_SET) override { return _stream->seek(offs, whence); }
    uint32 read(void *dataPtr, uint32 dataSize) override;
};

struct SteamIndexFile {
    byte id;
    Common::Platform platform;
    const char *pattern;
    const char *indexFileName;
    const char *executableName;
    int32 start;
    int32 len;
};

class ScummSteamFile : public ScummFile {
private:
    const SteamIndexFile &_indexFile;

    bool openWithSubRange(const Common::Path &filename, int32 subFileStart, int32 subFileLen);
public:
    ScummSteamFile(const ScummEngine *vm, const SteamIndexFile &indexFile) : ScummFile(vm), _indexFile(indexFile) {}

    bool open(const Common::Path &filename) override;
};

} // End of namespace Scumm

#endif