File: file_index.h

package info (click to toggle)
lziprecover 1.16-2
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-kfreebsd
  • size: 488 kB
  • ctags: 391
  • sloc: cpp: 3,433; sh: 362; makefile: 118
file content (109 lines) | stat: -rw-r--r-- 3,691 bytes parent folder | download
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
/*  Lziprecover - Data recovery tool for the lzip format
    Copyright (C) 2009-2014 Antonio Diaz Diaz.

    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, see <http://www.gnu.org/licenses/>.
*/

#ifndef INT64_MAX
#define INT64_MAX  0x7FFFFFFFFFFFFFFFLL
#endif


class Block
  {
  long long pos_, size_;		// pos + size <= INT64_MAX

public:
  Block( const long long p, const long long s ) : pos_( p ), size_( s ) {}

  long long pos() const { return pos_; }
  long long size() const { return size_; }
  long long end() const { return pos_ + size_; }

  void pos( const long long p ) { pos_ = p; }
  void size( const long long s ) { size_ = s; }

  bool operator==( const Block & b ) const
    { return pos_ == b.pos_ && size_ == b.size_; }
  bool operator!=( const Block & b ) const
    { return pos_ != b.pos_ || size_ != b.size_; }

  bool operator<( const Block & b ) const { return pos_ < b.pos_; }

  bool overlaps( const Block & b ) const
    { return ( pos_ < b.end() && b.pos_ < end() ); }
  void shift( Block & b ) { ++size_; ++b.pos_; --b.size_; }
  Block split( const long long pos );
  };


class File_index
  {
  struct Member
    {
    Block dblock, mblock;		// data block, member block

    Member( const long long dp, const long long ds,
            const long long mp, const long long ms )
      : dblock( dp, ds ), mblock( mp, ms ) {}

    bool operator==( const Member & m ) const { return ( mblock == m.mblock ); }
    bool operator!=( const Member & m ) const { return ( mblock != m.mblock ); }
    };

  std::vector< Member > member_vector;
  std::string error_;
  long long isize;
  int retval_;

  void set_errno_error( const char * const msg );
  void set_num_error( const char * const msg1, unsigned long long num,
                      const char * const msg2 = "." );

public:
  File_index() : error_( "No index." ), isize( 0 ), retval_( 2 ) {}
  explicit File_index( const int infd );
  File_index( const std::vector< int > & infd_vector, const long long fsize );

  long members() const { return member_vector.size(); }
  const std::string & error() const { return error_; }
  int retval() const { return retval_; }

  bool operator==( const File_index & fi ) const
    {
    if( retval_ || fi.retval_ || isize != fi.isize ||
        member_vector.size() != fi.member_vector.size() ) return false;
    for( unsigned long i = 0; i < member_vector.size(); ++i )
      if( member_vector[i] != fi.member_vector[i] ) return false;
    return true;
    }
  bool operator!=( const File_index & fi ) const { return !( *this == fi ); }

  long long data_end() const
    { if( member_vector.size() ) return member_vector.back().dblock.end();
      else return 0; }

  long long file_end() const
    { if( member_vector.size() ) return member_vector.back().mblock.end();
      else return 0; }

  // total size including trailing garbage (if any)
  long long file_size() const
    { if( isize >= 0 ) return isize; else return 0; }

  const Block & dblock( const long i ) const
    { return member_vector[i].dblock; }
  const Block & mblock( const long i ) const
    { return member_vector[i].mblock; }
  };