-
Notifications
You must be signed in to change notification settings - Fork 27
/
DataWriter.cpp
82 lines (72 loc) · 2.45 KB
/
DataWriter.cpp
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
/**
* D-LAN - A decentralized LAN file sharing software.
* Copyright (C) 2010-2012 Greg Burri <greg.burri@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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <priv/Cache/DataWriter.h>
using namespace FM;
#include <Common/Settings.h>
#include <Exceptions.h>
#include <priv/Log.h>
#include <priv/Cache/DataReader.h>
/**
* @remarks The setting "check_received_data_integrity" can be changed at runtime.
* @exception IOErrorException
* @exception ChunkDeletedException
* @exception ChunkDataUnknownException
*/
DataWriter::DataWriter(Chunk& chunk) :
CHECK_DATA_INTEGRITY(SETTINGS.get<bool>("check_received_data_integrity")), chunk(chunk)
{
if (this->CHECK_DATA_INTEGRITY && this->chunk.getKnownBytes() > 0)
{
try
{
static const quint32 BUFFER_SIZE = SETTINGS.get<quint32>("buffer_size_reading");
char buffer[BUFFER_SIZE];
DataReader reader(this->chunk);
int offset = 0;
int bytesRead = 0;
while (bytesRead = reader.read(buffer, offset))
{
this->hasher.addData(buffer, bytesRead);
offset += bytesRead;
}
}
// If the file can't be read it may be created later.
catch (UnableToOpenFileInReadModeException&)
{
L_WARN("UnableToOpenFileInReadModeException");
}
}
this->chunk.newDataWriterCreated();
}
DataWriter::~DataWriter()
{
this->chunk.dataWriterDeleted();
}
bool DataWriter::write(const char* buffer, int nbBytes)
{
if (this->CHECK_DATA_INTEGRITY)
{
this->hasher.addData(buffer, nbBytes);
if (this->chunk.getKnownBytes() + nbBytes == this->chunk.getChunkSize() && this->hasher.getResult() != this->chunk.getHash())
{
this->chunk.setKnownBytes(0);
throw hashMissmatchException();
}
}
return this->chunk.write(buffer, nbBytes);
}