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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. *
***************************************************************************/
#include <klocale.h>
#include <util/log.h>
#include <util/file.h>
#include <util/error.h>
#include <util/array.h>
#include <util/bitset.h>
#include <util/fileops.h>
#include <torrent/downloader.h>
#include <torrent/torrent.h>
#include <torrent/globals.h>
#include <torrent/chunkdownload.h>
#include <ktversion.h>
#include "ccmigrate.h"
namespace bt
{
bool IsPreMMap(const QString & current_chunks)
{
File fptr;
if (!fptr.open(current_chunks,"rb"))
return false;
CurrentChunksHeader chdr;
fptr.read(&chdr,sizeof(CurrentChunksHeader));
if (chdr.magic != CURRENT_CHUNK_MAGIC)
{
// magic number not good, so pre
return true;
}
if (chdr.major >= 2 || (chdr.major == 1 && chdr.minor >= 2))
{
// version number is 1.2 or greater
return false;
}
return false;
}
static bool MigrateChunk(const Torrent & tor,File & new_cc,File & old_cc)
{
Uint32 ch = 0;
old_cc.read(&ch,sizeof(Uint32));
Out() << "Migrating chunk " << ch << endl;
if (ch >= tor.getNumChunks())
return false;
// calculate the size
Uint32 csize = 0;
if (ch == tor.getNumChunks() - 1)
{
// ch is the last chunk, so it might have a different size
csize = tor.getFileLength() % tor.getChunkSize();
if (ch == 0)
csize = tor.getChunkSize();
}
else
{
csize = tor.getChunkSize();
}
// calculate the number of pieces
Uint32 num_pieces = csize / MAX_PIECE_LEN;
if (csize % MAX_PIECE_LEN > 0)
num_pieces++;
// load the pieces array
Array<bool> pieces(num_pieces);
old_cc.read(pieces,sizeof(bool)*num_pieces);
// convert bool array to bitset
BitSet pieces_bs(num_pieces);
for (Uint32 i = 0;i < num_pieces;i++)
pieces_bs.set(i,pieces[i]);
// load the actual data
Array<Uint8> data(csize);
old_cc.read(data,csize);
// write to the new file
ChunkDownloadHeader hdr;
hdr.index = ch;
hdr.num_bits = num_pieces;
hdr.buffered = 1; // by default we will use buffered chunks
// save the chunk header
new_cc.write(&hdr,sizeof(ChunkDownloadHeader));
// save the bitset
new_cc.write(pieces_bs.getData(),pieces_bs.getNumBytes());
new_cc.write(data,csize);
return true;
}
static void MigrateCC(const Torrent & tor,const QString & current_chunks)
{
Out() << "Migrating current_chunks file " << current_chunks << endl;
// open the old current_chunks file
File old_cc;
if (!old_cc.open(current_chunks,"rb"))
throw Error(i18n("Cannot open file %1 : %2").arg(current_chunks).arg(old_cc.errorString()));
// open a new file in the /tmp dir
File new_cc;
QString tmp = current_chunks + ".tmp";
if (!new_cc.open(tmp,"wb"))
throw Error(i18n("Cannot open file %1 : %2").arg(tmp).arg(old_cc.errorString()));
// read the number of chunks
Uint32 num = 0;
old_cc.read(&num,sizeof(Uint32));
Out() << "Found " << num << " chunks" << endl;
// write the new current_chunks header
CurrentChunksHeader hdr;
hdr.magic = CURRENT_CHUNK_MAGIC;
hdr.major = kt::MAJOR;
hdr.minor = kt::MINOR;
hdr.num_chunks = num;
new_cc.write(&hdr,sizeof(CurrentChunksHeader));
for (Uint32 i = 0;i < num;i++)
{
if (!MigrateChunk(tor,new_cc,old_cc))
break;
}
// migrate done, close both files and move new_cc to old_cc
new_cc.close();
old_cc.close();
bt::Delete(current_chunks);
bt::Move(tmp,current_chunks);
}
void MigrateCurrentChunks(const Torrent & tor,const QString & current_chunks)
{
try
{
MigrateCC(tor,current_chunks);
}
catch (...)
{
// cleanup tmp files upon error
bt::Delete("/tmp/kt_current_chunks",true);
throw;
}
}
}
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