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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.
*
* $URL$
* $Id$
*
*/
#ifndef COMMON_SAVEFILE_H
#define COMMON_SAVEFILE_H
#include "common/noncopyable.h"
#include "common/scummsys.h"
#include "common/stream.h"
#include "common/str.h"
#include "common/error.h"
namespace Common {
/**
* A class which allows game engines to load game state data.
* That typically means "save games", but also includes things like the
* IQ points in Indy3.
*/
class InSaveFile : public SeekableReadStream {};
/**
* A class which allows game engines to save game state data.
* That typically means "save games", but also includes things like the
* IQ points in Indy3.
*/
class OutSaveFile : public WriteStream {
public:
/**
* Close this savefile, to be called right before destruction of this
* savefile. The idea is that this ways, I/O errors that occur
* during closing/flushing of the file can still be handled by the
* game engine.
*
* By default, this just flushes the stream.
*/
virtual void finalize() {
flush();
}
};
/**
* The SaveFileManager is serving as a factor for InSaveFile
* and OutSaveFile objects.
*
* Engines and other code should use SaveFiles whenever they need to
* store data which they need to be able to retrieve later on --
* i.e. typically save states, but also configuration files and similar
* things.
*
* While not declared as a singleton,
* it is effectively used as such, with OSystem::getSavefileManager
* returning the single SaveFileManager instances to be used.
*/
class SaveFileManager : NonCopyable {
protected:
SFMError _error;
String _errorDesc;
/**
* Sets the last ocurred error.
* @param error Code identifying the last error.
* @param errorDesc String describing the last error.
*/
virtual void setError(SFMError error, const String &errorDesc) { _error = error; _errorDesc = errorDesc; }
public:
virtual ~SaveFileManager() {}
/**
* Clears the last set error code and string.
*/
virtual void clearError() { _error = SFM_NO_ERROR; _errorDesc = ""; }
/**
* Returns the last ocurred error code. If none ocurred, returns SFM_NO_ERROR.
*
* @return A SFMError indicating the type of the last error.
*/
virtual SFMError getError() { return _error; }
/**
* Returns the last ocurred error description. If none ocurred, returns 0.
*
* @return A string describing the last error.
*/
virtual String getErrorDesc() { return _errorDesc; }
/**
* Returns the last ocurred error description. If none ocurred, returns 0.
* Also clears the last error state and description.
*
* @return A string describing the last error.
*/
virtual String popErrorDesc();
/**
* Open the file with name filename in the given directory for saving.
* @param filename the filename
* @return pointer to an OutSaveFile, or NULL if an error occured.
*/
virtual OutSaveFile *openForSaving(const char *filename) = 0;
/**
* Open the file with name filename in the given directory for loading.
* @param filename the filename
* @return pointer to an InSaveFile, or NULL if an error occured.
*/
virtual InSaveFile *openForLoading(const char *filename) = 0;
/**
* Removes the given savefile from the filesystem.
* @param filename Filename path pointing to the savefile.
* @return true if no error ocurred. false otherwise.
*/
virtual bool removeSavefile(const char *filename) = 0;
/**
* Renames the given savefile.
* @param oldFilename Old filename.
* @param newFilename New filename.
* @return true if no error ocurred. false otherwise.
*/
virtual bool renameSavefile(const char *oldFilename, const char *newFilename);
/**
* Request a list of available savegames with a given DOS-style pattern,
* also known as "glob" in the UNIX world. Refer to the Common::match()
* function to learn about the precise pattern format.
* @param pattern Pattern to match. Wildcards like * or ? are available.
* @return list of strings for all present file names.
* @see Common::match
*/
virtual Common::StringList listSavefiles(const char *pattern) = 0;
};
} // End of namespace Common
#endif
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