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
|
// Copyright (c) 2012-2014 Konstantin Isakov <ikm@zbackup.org>
// Part of ZBackup. Licensed under GNU GPLv2 or later + OpenSSL, see LICENSE
#ifndef INDEX_FILE_HH_INCLUDED__
#define INDEX_FILE_HH_INCLUDED__
#include <exception>
#include <string>
#include "adler32.hh"
#include "bundle.hh"
#include "encrypted_file.hh"
#include "encryption_key.hh"
#include "ex.hh"
#include "file.hh"
#include "nocopy.hh"
#include "zbackup.pb.h"
/// Index files store all existing chunk ids and their bundle ids. This
/// information can also be retrieved by scanning all bundle files, but that
/// would incur a lot of disk seeks which we want to minimize here
namespace IndexFile {
using std::string;
/// Creates index files
class Writer: NoCopy
{
EncryptedFile::OutputStream stream;
public:
/// Creates a new chunk log. Initially it is stored in a temporary file
Writer( EncryptionKey const &, string const & fileName );
/// Adds a bundle info to the log
void add( BundleInfo const &, Bundle::Id const & bundleId );
/// Finalizes the file
~Writer();
};
/// Reads index files
class Reader: NoCopy
{
EncryptedFile::InputStream stream;
public:
DEF_EX( Ex, "Index file reader exception", std::exception )
DEF_EX( exUnsupportedVersion, "Unsupported version of the index file format", Ex )
DEF_EX( exIncorrectBundleIdSize, "Incorrect bundle id size encountered", Ex )
Reader( EncryptionKey const &, string const & fileName );
/// Reads the next record from the file. Returns false if no more records can
/// be found
bool readNextRecord( BundleInfo &, Bundle::Id & bundleId );
};
}
#endif
|
