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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 PSPSTREAM_H_
#define PSPSTREAM_H_
#include "backends/fs/stdiostream.h"
#include "backends/platform/psp/powerman.h"
#include "common/list.h"
/*
* Class to handle special suspend/resume needs of PSP IO Streams
*/
class PSPIoStream : public StdioStream, public Suspendable {
protected:
Common::String _path;
int _fileSize;
bool _writeMode; // for resuming in the right mode
int _physicalPos; // position in the real file
int _pos; // position. Sometimes virtual
bool _inCache; // whether we're in cache (virtual) mode
bool _eos; // EOS flag
enum {
SuspendError = 2,
ResumeError = 3
};
enum {
CACHE_SIZE = 1024,
MIN_READ_SIZE = 1024 // reading less than 1024 takes exactly the same time as 1024
};
// For caching
char *_cache;
int _cacheStartOffset; // starting offset of the cache. -1 when cache is invalid
mutable int _ferror; // file error state
int _errorSuspend; // for debugging
mutable int _errorSource;
int _errorPos;
void * _errorHandle;
int _suspendCount;
bool synchronizePhysicalPos(); // synchronize the physical and virtual positions
bool isOffsetInCache(uint32 pos); // check if an offset is found in cache
bool isCacheValid() { return _cacheStartOffset != -1; }
public:
/**
* Given a path, invoke fopen on that path and wrap the result in a
* PSPIoStream instance.
*/
static PSPIoStream *makeFromPath(const Common::String &path, bool writeMode);
PSPIoStream(const Common::String &path, bool writeMode);
virtual ~PSPIoStream();
void * open(); // open the file pointed to by the file path
bool err() const;
void clearErr();
bool eos() const;
virtual uint32 write(const void *dataPtr, uint32 dataSize);
virtual bool flush();
virtual int32 pos() const;
virtual int32 size() const;
virtual bool seek(int32 offs, int whence = SEEK_SET);
virtual uint32 read(void *dataPtr, uint32 dataSize);
int suspend(); /* Suspendable interface (power manager) */
int resume(); /* " " */
};
#endif /* PSPSTREAM_H_ */
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