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/***************************************************************************
* Copyright (C) 2005 by Joris Guisson *
* joris.guisson@gmail.com *
* *
* 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 BTCHUNK_H
#define BTCHUNK_H
#include <util/constants.h>
#include "cachefile.h"
namespace bt
{
class SHA1Hash;
/**
* @author Joris Guisson
* @brief Keep track of a piece of the file
*
* Keeps track of a piece of the file. The Chunk has 3 possible states :
* - MMAPPED : It is memory mapped
* - BUFFERED : It is in a buffer in dynamically allocated memory
* (because the chunk is located in 2 or more separate files, so we cannot just set a pointer
* to a region of mmapped memory)
* - ON_DISK : On disk
* - NOT_DOWNLOADED : It hasn't been dowloaded yet, and there is no buffer allocated
*/
class Chunk : public MMappeable
{
public:
Chunk(unsigned int index,Uint32 size);
~Chunk();
enum Status
{
MMAPPED,
BUFFERED,
ON_DISK,
NOT_DOWNLOADED
};
/// Get the chunks status.
Status getStatus() const;
/**
* Set the chunks status
* @param s
*/
void setStatus(Status s);
/// Get the data
const Uint8* getData() const;
/// Get the data
Uint8* getData();
/// Set the data and the new status
void setData(Uint8* d,Status nstatus);
/// Clear the chunk (delete data depending on the mode)
void clear();
/// Get the chunk's index
Uint32 getIndex() const;
/// Get the chunk's size
Uint32 getSize() const;
/// Add one to the reference counter
void ref();
/// --reference counter
void unref();
/// reference coun > 0
bool taken() const;
/// allocate data if not already done, sets the status to buffered
void allocate();
/// get chunk priority
Priority getPriority() const;
/// set chunk priority
void setPriority(Priority newpriority = NORMAL_PRIORITY);
/// Is chunk excluded
bool isExcluded() const;
/// Is this a seed only chunk
bool isExcludedForDownloading() const;
/// In/Exclude chunk
void setExclude(bool yes);
/**
* Check wehter the chunk matches it's hash.
* @param h The hash
* @return true if the data matches the hash
*/
bool checkHash(const SHA1Hash & h) const;
private:
virtual void unmapped();
private:
Status status;
Uint32 index;
Uint8* data;
Uint32 size;
int ref_count;
Priority priority;
};
inline Chunk::Status Chunk::getStatus() const
{
return status;
}
inline void Chunk::setStatus(Chunk::Status s)
{
status = s;
}
inline const Uint8* Chunk::getData() const {return data;}
inline Uint8* Chunk::getData() {return data;}
inline Uint32 Chunk::getIndex() const {return index;}
inline Uint32 Chunk::getSize() const {return size;}
inline void Chunk::ref() {ref_count++;}
inline void Chunk::unref() {ref_count--;}
inline bool Chunk::taken() const {return ref_count > 0;}
inline Priority Chunk::getPriority() const {return priority;}
inline void Chunk::setPriority(Priority newpriority) {priority = newpriority;}
inline bool Chunk::isExcluded() const
{
return priority == EXCLUDED;
}
inline bool Chunk::isExcludedForDownloading() const
{
return priority == ONLY_SEED_PRIORITY;
}
inline void Chunk::setExclude(bool yes)
{if(yes) priority = EXCLUDED; else priority = NORMAL_PRIORITY;}
}
#endif
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