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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
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#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/stream.h"
#include "graphics/surface.h"
namespace Sherlock {
typedef Common::Array<byte> CacheEntry;
typedef Common::HashMap<Common::String, CacheEntry, Common::IgnoreCase_Hash, Common::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::String, LibraryEntry, Common::IgnoreCase_Hash, Common::IgnoreCase_EqualTo> LibraryIndex;
typedef Common::HashMap<Common::String, LibraryIndex, Common::IgnoreCase_Hash, Common::IgnoreCase_EqualTo> LibraryIndexes;
class SherlockEngine;
class Cache {
private:
SherlockEngine *_vm;
CacheHash _resources;
public:
Cache(SherlockEngine *_vm);
/**
* Returns true if a given file is currently being cached
*/
bool isCached(const Common::String &filename) const;
/**
* Loads a file into the cache if it's not already present, and returns it.
* If the file is LZW compressed, automatically decompresses it and loads
* the uncompressed version into memory
*/
void load(const Common::String &name);
/**
* Load a cache entry based on a passed stream
*/
void load(const Common::String &name, Common::SeekableReadStream &stream);
/**
* Get a file from the cache
*/
Common::SeekableReadStream *get(const Common::String &filename) const;
};
class Resources {
private:
SherlockEngine *_vm;
Cache _cache;
LibraryIndexes _indexes;
int _resourceIndex;
/**
* Reads in the index from a library file, and caches it's index for later use
*/
void loadLibraryIndex(const Common::String &libFilename, Common::SeekableReadStream *stream, bool isNewStyle);
public:
Resources(SherlockEngine *vm);
/**
* Adds the specified file to the cache. If it's a library file, takes care of
* loading it's index for future use
*/
void addToCache(const Common::String &filename);
/**
* Adds a resource from a library file to the cache
*/
void addToCache(const Common::String &filename, const Common::String &libFilename);
/**
* Adds a given stream to the cache under the given name
*/
void addToCache(const Common::String &filename, Common::SeekableReadStream &stream);
bool isInCache(const Common::String &filename) const { return _cache.isCached(filename); }
/**
* Checks the passed stream, and if is compressed, deletes it and replaces it with it's uncompressed data
*/
void decompressIfNecessary(Common::SeekableReadStream *&stream);
/**
* Returns a stream for a given file
*/
Common::SeekableReadStream *load(const Common::String &filename);
/**
* Loads a specific resource from a given library file
*/
Common::SeekableReadStream *load(const Common::String &filename, const Common::String &libraryFile, bool suppressErrors = false);
/**
* Returns true if the given file exists on disk or in the cache
*/
bool exists(const Common::String &filename) const;
/**
* Returns the index of the last loaded resource in it's given library file.
* This will be used primarily when loading talk files, so the engine can
* update the given conversation number in the journal
*/
int resourceIndex() const;
/**
* Decompresses LZW compressed data
*/
Common::SeekableReadStream *decompress(Common::SeekableReadStream &source);
/**
* Decompresses LZW compressed data
*/
Common::SeekableReadStream *decompress(Common::SeekableReadStream &source, uint32 outSize);
/**
* Decompresses LZW compressed data
*/
void decompress(Common::SeekableReadStream &source, byte *buffer, uint32 outSize);
/**
* Decompresses LZW compressed data
*/
static Common::SeekableReadStream *decompressLZ(Common::SeekableReadStream &source, uint32 outSize);
/**
* Decompresses LZW compressed data
*/
static void decompressLZ(Common::SeekableReadStream &source, byte *outBuffer, int32 outSize, int32 inSize);
};
} // End of namespace Sherlock
#endif
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