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
|
/* Lziprecover - Data recovery tool for the lzip format
Copyright (C) 2009-2019 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/>.
*/
#define _FILE_OFFSET_BITS 64
#include <algorithm>
#include <cerrno>
#include <climits>
#include <cstdio>
#include <cstring>
#include <string>
#include <vector>
#include <stdint.h>
#include <unistd.h>
#include <sys/stat.h>
#include "lzip.h"
#include "lzip_index.h"
namespace {
void first_filename( const std::string & input_filename,
const std::string & default_output_filename,
const int max_digits )
{
output_filename = default_output_filename.empty() ?
input_filename : default_output_filename;
int b = output_filename.size();
while( b > 0 && output_filename[b-1] != '/' ) --b;
output_filename.insert( b, "rec1" );
if( max_digits > 1 ) output_filename.insert( b + 3, max_digits - 1, '0' );
}
bool next_filename( const int max_digits )
{
if( verbosity >= 1 )
{
std::printf( "Member '%s' done \n", output_filename.c_str() );
std::fflush( stdout );
}
int b = output_filename.size();
while( b > 0 && output_filename[b-1] != '/' ) --b;
for( int i = b + max_digits + 2; i > b + 2; --i ) // "rec<max_digits>"
{
if( output_filename[i] < '9' ) { ++output_filename[i]; return true; }
else output_filename[i] = '0';
}
return false;
}
} // end namespace
int split_file( const std::string & input_filename,
const std::string & default_output_filename, const bool force )
{
struct stat in_stats;
const int infd = open_instream( input_filename.c_str(), &in_stats, true, true );
if( infd < 0 ) return 1;
Lzip_index lzip_index( infd, true, true, true, true );
if( lzip_index.retval() != 0 )
{
show_file_error( input_filename.c_str(), lzip_index.error().c_str() );
return lzip_index.retval();
}
// verify last member
const Block b = lzip_index.mblock( lzip_index.members() - 1 );
long long mpos = b.pos();
long long msize = b.size();
long long failure_pos = 0;
if( !safe_seek( infd, mpos ) ) return 1;
if( test_member_from_file( infd, msize, &failure_pos ) == 1 )
{ // corrupt or fake trailer
while( true )
{
mpos += failure_pos; msize -= failure_pos;
if( msize < min_member_size ) break; // trailing data
if( !safe_seek( infd, mpos ) ) return 1;
if( test_member_from_file( infd, msize, &failure_pos ) != 1 ) break;
}
lzip_index = Lzip_index( infd, true, true, true, true, mpos );
if( lzip_index.retval() != 0 )
{
show_file_error( input_filename.c_str(), lzip_index.error().c_str() );
return lzip_index.retval();
}
}
if( !safe_seek( infd, 0 ) ) return 1;
int max_digits = 1;
for( long i = lzip_index.blocks( true ); i >= 10; i /= 10 ) ++max_digits;
first_filename( input_filename, default_output_filename, max_digits );
long long stream_pos = 0; // first pos not yet written to file
set_signal_handler();
for( long i = 0; i < lzip_index.members(); ++i )
{
const Block & mb = lzip_index.mblock( i );
if( mb.pos() > stream_pos ) // gap
{
if( !open_outstream( force, false, false, false ) )
{ close( infd ); return 1; }
if( !copy_file( infd, outfd, mb.pos() - stream_pos ) ||
close_outstream( &in_stats ) != 0 )
cleanup_and_fail( 1 );
next_filename( max_digits );
}
if( !open_outstream( force, false, false, false ) ) // member
{ close( infd ); return 1; }
if( !copy_file( infd, outfd, mb.size() ) ||
close_outstream( &in_stats ) != 0 )
cleanup_and_fail( 1 );
next_filename( max_digits );
stream_pos = mb.end();
}
if( lzip_index.file_size() > stream_pos ) // trailing data
{
if( !open_outstream( force, false, false, false ) )
{ close( infd ); return 1; }
if( !copy_file( infd, outfd, lzip_index.file_size() - stream_pos ) ||
close_outstream( &in_stats ) != 0 )
cleanup_and_fail( 1 );
next_filename( max_digits );
}
close( infd );
return 0;
}
|
