summaryrefslogtreecommitdiffstats
path: root/libktorrent/migrate/ccmigrate.cpp
blob: 3975de481cd8500d2c56f48a649b4e8e1ae92822 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
/***************************************************************************
 *   Copyright (C) 2005 by Joris Guisson                                   *
 *   [email protected]                                               *
 *                                                                         *
 *   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 TQString & 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 TQString & 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").tqarg(current_chunks).tqarg(old_cc.errorString()));
		
		// open a new file in the /tmp dir
		File new_cc;
		TQString tmp = current_chunks + ".tmp";
		if (!new_cc.open(tmp,"wb"))
			throw Error(i18n("Cannot open file %1 : %2").tqarg(tmp).tqarg(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 TQString & current_chunks)
	{
		try
		{
			MigrateCC(tor,current_chunks);
		}
		catch (...)
		{
			// cleanup tmp files upon error
			bt::Delete("/tmp/kt_current_chunks",true);
			throw;
		}
	}

}