resources.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 SHERLOCK_RESOURCES_H
#define SHERLOCK_RESOURCES_H

#include "common/array.h"
#include "common/file.h"
#include "common/hashmap.h"
#include "common/hash-str.h"
#include "common/rect.h"
#include "common/str.h"
#include "common/str-array.h"
#include "common/stream.h"
#include "graphics/surface.h"

namespace Sherlock {

typedef Common::Array<byte> CacheEntry;
typedef Common::HashMap<Common::Path, CacheEntry, Common::Path::IgnoreCase_Hash, Common::Path::IgnoreCase_EqualTo> CacheHash;

struct LibraryEntry {
    uint32 _offset, _size;
    int _index;

    LibraryEntry() : _index(0), _offset(0), _size(0) {}
    LibraryEntry(int index, uint32 offset, uint32 size) :
        _index(index), _offset(offset), _size(size) {}
};
typedef Common::HashMap<Common::Path, LibraryEntry, Common::Path::IgnoreCase_Hash, Common::Path::IgnoreCase_EqualTo> LibraryIndex;
typedef Common::HashMap<Common::Path, LibraryIndex, Common::Path::IgnoreCase_Hash, Common::Path::IgnoreCase_EqualTo> LibraryIndexes;

class SherlockEngine;

class Cache {
private:
    SherlockEngine *_vm;
    CacheHash _resources;
public:
    Cache(SherlockEngine *_vm);

    bool isCached(const Common::Path &filename) const;

    void load(const Common::Path &name);

    void load(const Common::Path &name, Common::SeekableReadStream &stream);

    Common::SeekableReadStream *get(const Common::Path &filename) const;
};

class Resources {
private:
    SherlockEngine *_vm;
    Cache _cache;
    LibraryIndexes _indexes;
    int _resourceIndex;

    void loadLibraryIndex(const Common::Path &libFilename, Common::SeekableReadStream *stream, bool isNewStyle);
public:
    Resources(SherlockEngine *vm);

    void addToCache(const Common::Path &filename);

    void addToCache(const Common::Path &filename, const Common::Path &libFilename);

    void addToCache(const Common::Path &filename, Common::SeekableReadStream &stream);

    bool isInCache(const Common::Path &filename) const { return _cache.isCached(filename); }

    void decompressIfNecessary(Common::SeekableReadStream *&stream);

    Common::SeekableReadStream *load(const Common::Path &filename);

    Common::SeekableReadStream *load(const Common::Path &filename, const Common::Path &libraryFile, bool suppressErrors = false);

    bool exists(const Common::Path &filename) const;

    int resourceIndex() const;

    void getResourceNames(const Common::Path &libraryFile, Common::StringArray &names);

    Common::SeekableReadStream *decompress(Common::SeekableReadStream &source);

    Common::SeekableReadStream *decompress(Common::SeekableReadStream &source, uint32 outSize);

    void decompress(Common::SeekableReadStream &source, byte *buffer, uint32 outSize);

    static Common::SeekableReadStream *decompressLZ(Common::SeekableReadStream &source, uint32 outSize);

    static void decompressLZ(Common::SeekableReadStream &source, byte *outBuffer, int32 outSize, int32 inSize);
};

} // End of namespace Sherlock

#endif