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
|
/* Plzip - Parallel compressor compatible with lzip
Copyright (C) 2009-2015 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/>.
*/
#include <algorithm>
#include <cerrno>
#include <cstdio>
#include <cstring>
#include <string>
#include <vector>
#include <pthread.h>
#include <stdint.h>
#include <unistd.h>
#include "lzip.h"
#include "file_index.h"
int seek_read( const int fd, uint8_t * const buf, const int size,
const long long pos )
{
if( lseek( fd, pos, SEEK_SET ) == pos )
return readblock( fd, buf, size );
return 0;
}
void File_index::set_errno_error( const char * const msg )
{
error_ = msg; error_ += std::strerror( errno ); error_ += '.';
retval_ = 1;
}
void File_index::set_num_error( const char * const msg1, unsigned long long num,
const char * const msg2 )
{
char buf[80];
snprintf( buf, sizeof buf, "%s%llu%s", msg1, num, msg2 );
error_ = buf;
retval_ = member_vector.empty() ? 1 : 2; // maybe trailing garbage
}
File_index::File_index( const int infd )
: retval_( 0 )
{
const long long isize = lseek( infd, 0, SEEK_END );
if( isize < 0 )
{ set_errno_error( "Input file is not seekable: " ); return; }
if( isize < min_member_size )
{ error_ = "Input file is too short."; retval_ = 2; return; }
if( isize > INT64_MAX )
{ error_ = "Input file is too long (2^63 bytes or more).";
retval_ = 2; return; }
File_header header;
if( seek_read( infd, header.data, File_header::size, 0 ) != File_header::size )
{ set_errno_error( "Error reading member header: " ); return; }
if( !header.verify_magic() )
{ error_ = "Bad magic number (file not in lzip format).";
retval_ = 2; return; }
if( !header.verify_version() )
{ set_num_error( "Version ", header.version(),
" member format not supported." ); retval_ = 2; return; }
long long pos = isize; // always points to a header or to EOF
const long long max_garbage = 1024;
while( pos >= min_member_size )
{
File_trailer trailer;
if( seek_read( infd, trailer.data, File_trailer::size,
pos - File_trailer::size ) != File_trailer::size )
{ set_errno_error( "Error reading member trailer: " ); break; }
const long long member_size = trailer.member_size();
if( member_size < min_member_size || member_size > pos )
{
if( member_vector.empty() && isize - pos < max_garbage )
{ --pos; continue; } // maybe trailing garbage
set_num_error( "Member size in trailer is corrupt at pos ", pos - 8 );
break;
}
if( seek_read( infd, header.data, File_header::size,
pos - member_size ) != File_header::size )
{ set_errno_error( "Error reading member header: " ); break; }
if( !header.verify_magic() || !header.verify_version() )
{
if( member_vector.empty() && isize - pos < max_garbage )
{ --pos; continue; } // maybe trailing garbage
set_num_error( "Bad header at pos ", pos - member_size );
break;
}
const unsigned dictionary_size = header.dictionary_size();
if( member_vector.empty() && isize - pos > File_header::size &&
seek_read( infd, header.data, File_header::size, pos ) == File_header::size &&
header.verify_magic() && header.verify_version() )
{
error_ = "Last member in input file is truncated or corrupt.";
retval_ = 2; break;
}
pos -= member_size;
member_vector.push_back( Member( 0, trailer.data_size(),
pos, member_size, dictionary_size ) );
}
if( pos != 0 || member_vector.empty() )
{
member_vector.clear();
if( retval_ == 0 ) { error_ = "Can't create file index."; retval_ = 2; }
return;
}
std::reverse( member_vector.begin(), member_vector.end() );
for( unsigned long i = 0; i < member_vector.size() - 1; ++i )
{
const long long end = member_vector[i].dblock.end();
if( end < 0 || end > INT64_MAX )
{
member_vector.clear();
error_ = "Data in input file is too long (2^63 bytes or more).";
retval_ = 2; return;
}
member_vector[i+1].dblock.pos( end );
}
}
|
