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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* 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
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#ifndef _D_PIECE_H_
#define _D_PIECE_H_
#include "common.h"
#include "SharedHandle.h"
#include <stdint.h>
#include <deque>
#include <string>
namespace aria2 {
class BitfieldMan;
#ifdef ENABLE_MESSAGE_DIGEST
class MessageDigestContext;
#endif // ENABLE_MESSAGE_DIGEST
class Piece {
private:
size_t index;
size_t length;
size_t _blockLength;
BitfieldMan* bitfield;
#ifdef ENABLE_MESSAGE_DIGEST
size_t _nextBegin;
std::string _hashAlgo;
SharedHandle<MessageDigestContext> _mdctx;
#endif // ENABLE_MESSAGE_DIGEST
public:
static const size_t BLOCK_LENGTH = 16*1024;
Piece();
Piece(size_t index, size_t length, size_t blockLength = BLOCK_LENGTH);
Piece(const Piece& piece);
~Piece();
Piece& operator=(const Piece& piece);
bool operator==(const Piece& piece) const
{
return index == piece.index;
}
bool operator<(const Piece& piece) const
{
return index < piece.index;
}
bool getMissingUnusedBlockIndex(size_t& index) const;
bool getMissingBlockIndex(size_t& index) const;
bool getFirstMissingBlockIndexWithoutLock(size_t& index) const;
bool getAllMissingBlockIndexes(unsigned char* misbitfield,
size_t mislen) const;
void completeBlock(size_t blockIndex);
void cancelBlock(size_t blockIndex);
size_t countCompleteBlock() const;
size_t countMissingBlock() const;
bool hasBlock(size_t blockIndex) const;
/**
* Returns true if all blocks of this piece have been downloaded, otherwise
* returns false.
*/
bool pieceComplete() const;
size_t countBlock() const;
size_t getBlockLength(size_t index) const;
size_t getBlockLength() const;
size_t getIndex() const { return index; }
void setIndex(size_t index) { this->index = index; }
size_t getLength() const { return length; }
void setLength(size_t index) { this->length = length; }
const unsigned char* getBitfield() const;
void setBitfield(const unsigned char* bitfield, size_t len);
size_t getBitfieldLength() const;
void clearAllBlock();
void setAllBlock();
std::string toString() const;
bool isBlockUsed(size_t index) const;
// Calculates completed length
size_t getCompletedLength();
#ifdef ENABLE_MESSAGE_DIGEST
void setHashAlgo(const std::string& algo);
// Updates hash value. This function compares begin and private variable
// _nextBegin and only when they are equal, hash is updated eating data and
// returns true. Otherwise returns false.
bool updateHash(uint32_t begin, const unsigned char* data, size_t dataLength);
bool isHashCalculated() const;
// Returns hash value in ASCII hexadecimal form.
// WARN: This function must be called only once.
std::string getHashString();
void destroyHashContext();
#endif // ENABLE_MESSAGE_DIGEST
/**
* Loses current bitfield state.
*/
void reconfigure(size_t length);
};
typedef SharedHandle<Piece> PieceHandle;
typedef std::deque<PieceHandle> Pieces;
} // namespace aria2
#endif // _D_PIECE_H_
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