pack.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 TEENAGENT_PACK_H
#define TEENAGENT_PACK_H

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

namespace TeenAgent {

class Pack {
protected:
    uint32 _fileCount;
public:
    Pack(): _fileCount(0) {}
    virtual ~Pack() {}
    virtual bool open(const Common::Path &filename) = 0;
    virtual void close() = 0;

    virtual uint32 fileCount() const { return _fileCount; }
    virtual uint32 getSize(uint32 id) const = 0;
    virtual uint32 read(uint32 id, byte *dst, uint32 size) const = 0;
    virtual Common::SeekableReadStream *getStream(uint32 id) const = 0;
};

class FilePack : public Pack {
    mutable Common::File file;
    uint32 *offsets;

public:
    FilePack();
    ~FilePack() override;

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

    uint32 getSize(uint32 id) const override;
    uint32 read(uint32 id, byte *dst, uint32 size) const override;
    Common::SeekableReadStream *getStream(uint32 id) const override;
};

class TransientFilePack : public Pack {
    uint32 *offsets;
    Common::Path _filename;

public:
    TransientFilePack();
    ~TransientFilePack() override;

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

    uint32 getSize(uint32 id) const override;
    uint32 read(uint32 id, byte *dst, uint32 size) const override;
    Common::SeekableReadStream *getStream(uint32 id) const override;
};

class MemoryPack : public Pack {
    struct Chunk {
        byte *data;
        uint32 size;
        inline Chunk(): data(0), size(0) {}
        inline Chunk(const Chunk &c) : data(c.data), size(c.size) { c.reset(); }
        inline Chunk &operator=(const Chunk &c) {
            data = c.data;
            size = c.size;
            c.reset();
            return *this;
        }
        inline ~Chunk() { delete[] data; }
        inline void reset() const {
            Chunk *c = const_cast<Chunk *>(this);
            c->data = 0;
            c->size = 0;
        }
    };
    Common::Array<Chunk> chunks;

public:
    bool open(const Common::Path &filename) override;
    void close() override;

    uint32 getSize(uint32 id) const override;
    uint32 read(uint32 id, byte *dst, uint32 size) const override;
    Common::SeekableReadStream *getStream(uint32 id) const override;
};

} // End of namespace TeenAgent

#endif