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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
|
/* Lziprecover - Data recovery tool for the lzip format
Copyright (C) 2009-2022 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 <cstdio>
#include <cstring>
#include <string>
#include <vector>
#include <stdint.h>
#include <unistd.h>
#include <utime.h>
#include <sys/stat.h>
#include "lzip.h"
#include "lzip_index.h"
// If strip is false, dump to outfd members/gaps/tdata in member_list.
// If strip is true, dump to outfd members/gaps/tdata not in member_list.
int dump_members( const std::vector< std::string > & filenames,
const std::string & default_output_filename,
const Member_list & member_list, const bool force,
bool ignore_errors, bool ignore_trailing,
const bool loose_trailing, const bool strip,
const bool to_stdout )
{
if( to_stdout || default_output_filename.empty() ) outfd = STDOUT_FILENO;
else
{
output_filename = default_output_filename;
set_signal_handler();
if( !open_outstream( force, false, false, false ) ) return 1;
}
if( ( strip || !member_list.tdata || member_list.damaged || member_list.range() ) &&
!check_tty_out() ) return 1; // check tty except for --dump=tdata
unsigned long long copied_size = 0, stripped_size = 0;
unsigned long long copied_tsize = 0, stripped_tsize = 0;
long members = 0, smembers = 0;
int files = 0, tfiles = 0, retval = 0;
if( member_list.damaged ) ignore_errors = true;
if( member_list.tdata ) ignore_trailing = true;
bool stdin_used = false;
for( unsigned i = 0; i < filenames.size(); ++i )
{
const bool from_stdin = ( filenames[i] == "-" );
if( from_stdin ) { if( stdin_used ) continue; else stdin_used = true; }
const char * const input_filename =
from_stdin ? "(stdin)" : filenames[i].c_str();
struct stat in_stats; // not used
const int infd = from_stdin ? STDIN_FILENO :
open_instream( input_filename, &in_stats, false, true );
if( infd < 0 ) { set_retval( retval, 1 ); continue; }
const Lzip_index lzip_index( infd, ignore_trailing, loose_trailing,
ignore_errors, ignore_errors );
if( lzip_index.retval() != 0 )
{
show_file_error( input_filename, lzip_index.error().c_str() );
set_retval( retval, lzip_index.retval() );
close( infd );
continue;
}
if( !safe_seek( infd, 0 ) ) cleanup_and_fail( 1 );
const long blocks = lzip_index.blocks( false ); // not counting tdata
long long stream_pos = 0; // first pos not yet read from file
long gaps = 0;
const long prev_members = members, prev_smembers = smembers;
const unsigned long long prev_stripped_size = stripped_size;
for( long j = 0; j < lzip_index.members(); ++j ) // copy members and gaps
{
const Block & mb = lzip_index.mblock( j );
if( mb.pos() > stream_pos ) // gap
{
const bool in = member_list.damaged ||
member_list.includes( j + gaps, blocks );
if( in == !strip )
{
if( !safe_seek( infd, stream_pos ) ||
!copy_file( infd, outfd, mb.pos() - stream_pos ) )
cleanup_and_fail( 1 );
copied_size += mb.pos() - stream_pos; ++members;
}
else { stripped_size += mb.pos() - stream_pos; ++smembers; }
++gaps;
}
bool in = member_list.includes( j + gaps, blocks ); // member
if( !in && member_list.damaged )
{
if( !safe_seek( infd, mb.pos() ) ) cleanup_and_fail( 1 );
in = ( test_member_from_file( infd, mb.size() ) != 0 ); // damaged
}
if( in == !strip )
{
if( !safe_seek( infd, mb.pos() ) ||
!copy_file( infd, outfd, mb.size() ) ) cleanup_and_fail( 1 );
copied_size += mb.size(); ++members;
}
else { stripped_size += mb.size(); ++smembers; }
stream_pos = mb.end();
}
if( strip && members == prev_members ) // all members were stripped
{ if( verbosity >= 1 )
show_file_error( input_filename, "All members stripped, skipping." );
stripped_size = prev_stripped_size; smembers = prev_smembers;
close( infd ); continue; }
if( ( !strip && members > prev_members ) ||
( strip && smembers > prev_smembers ) ) ++files;
// copy trailing data
const unsigned long long cdata_size = lzip_index.cdata_size();
const long long trailing_size = lzip_index.file_size() - cdata_size;
if( member_list.tdata == !strip && trailing_size > 0 &&
( !strip || i + 1 >= filenames.size() ) ) // strip all but last
{
if( !safe_seek( infd, cdata_size ) ||
!copy_file( infd, outfd, trailing_size ) ) cleanup_and_fail( 1 );
copied_tsize += trailing_size;
}
else if( trailing_size > 0 ) { stripped_tsize += trailing_size; ++tfiles; }
close( infd );
}
if( close_outstream( 0 ) != 0 ) set_retval( retval, 1 );
if( verbosity >= 1 )
{
if( !strip )
{
if( member_list.damaged || member_list.range() )
std::fprintf( stderr, "%llu bytes dumped from %ld %s from %d %s.\n",
copied_size,
members, ( members == 1 ) ? "member" : "members",
files, ( files == 1 ) ? "file" : "files" );
if( member_list.tdata )
std::fprintf( stderr, "%llu trailing bytes dumped.\n", copied_tsize );
}
else
{
if( member_list.damaged || member_list.range() )
std::fprintf( stderr, "%llu bytes stripped from %ld %s from %d %s.\n",
stripped_size,
smembers, ( smembers == 1 ) ? "member" : "members",
files, ( files == 1 ) ? "file" : "files" );
if( member_list.tdata )
std::fprintf( stderr, "%llu trailing bytes stripped from %d %s.\n",
stripped_tsize, tfiles, ( tfiles == 1 ) ? "file" : "files" );
}
}
return retval;
}
int remove_members( const std::vector< std::string > & filenames,
const Member_list & member_list, bool ignore_errors,
bool ignore_trailing, const bool loose_trailing )
{
unsigned long long removed_size = 0, removed_tsize = 0;
long members = 0;
int files = 0, tfiles = 0, retval = 0;
if( member_list.damaged ) ignore_errors = true;
if( member_list.tdata ) ignore_trailing = true;
for( unsigned i = 0; i < filenames.size(); ++i )
{
const char * const filename = filenames[i].c_str();
struct stat in_stats, dummy_stats;
const int infd = open_instream( filename, &in_stats, false, true );
if( infd < 0 ) { set_retval( retval, 1 ); continue; }
const Lzip_index lzip_index( infd, ignore_trailing, loose_trailing,
ignore_errors, ignore_errors );
if( lzip_index.retval() != 0 )
{
show_file_error( filename, lzip_index.error().c_str() );
set_retval( retval, lzip_index.retval() );
close( infd );
continue;
}
const int fd = open_truncable_stream( filename, &dummy_stats );
if( fd < 0 ) { close( infd ); set_retval( retval, 1 ); continue; }
if( !safe_seek( infd, 0 ) ) return 1;
const long blocks = lzip_index.blocks( false ); // not counting tdata
long long stream_pos = 0; // first pos not yet written to file
long gaps = 0;
bool error = false;
const long prev_members = members;
for( long j = 0; j < lzip_index.members(); ++j ) // copy members and gaps
{
const Block & mb = lzip_index.mblock( j );
const long long prev_end = (j > 0) ? lzip_index.mblock(j - 1).end() : 0;
if( mb.pos() > prev_end ) // gap
{
if( !member_list.damaged && !member_list.includes( j + gaps, blocks ) )
{
if( stream_pos != prev_end &&
( !safe_seek( infd, prev_end ) ||
!safe_seek( fd, stream_pos ) ||
!copy_file( infd, fd, mb.pos() - prev_end ) ) )
{ error = true; set_retval( retval, 1 ); break; }
stream_pos += mb.pos() - prev_end;
}
else ++members;
++gaps;
}
bool in = member_list.includes( j + gaps, blocks ); // member
if( !in && member_list.damaged )
{
if( !safe_seek( infd, mb.pos() ) )
{ error = true; set_retval( retval, 1 ); break; }
in = ( test_member_from_file( infd, mb.size() ) != 0 ); // damaged
}
if( !in )
{
if( stream_pos != mb.pos() &&
( !safe_seek( infd, mb.pos() ) ||
!safe_seek( fd, stream_pos ) ||
!copy_file( infd, fd, mb.size() ) ) )
{ error = true; set_retval( retval, 1 ); break; }
stream_pos += mb.size();
}
else ++members;
}
if( error ) { close( fd ); close( infd ); break; }
if( stream_pos == 0 ) // all members were removed
{ show_file_error( filename, "All members would be removed, skipping." );
close( fd ); close( infd ); set_retval( retval, 2 );
members = prev_members; continue; }
const long long cdata_size = lzip_index.cdata_size();
if( cdata_size > stream_pos )
{ removed_size += cdata_size - stream_pos; ++files; }
const long long file_size = lzip_index.file_size();
const long long trailing_size = file_size - cdata_size;
if( trailing_size > 0 )
{
if( !member_list.tdata ) // copy trailing data
{
if( stream_pos != cdata_size &&
( !safe_seek( infd, cdata_size ) ||
!safe_seek( fd, stream_pos ) ||
!copy_file( infd, fd, trailing_size ) ) )
{ close( fd ); close( infd ); set_retval( retval, 1 ); break; }
stream_pos += trailing_size;
}
else { removed_tsize += trailing_size; ++tfiles; }
}
if( stream_pos >= file_size ) // no members were removed
{ close( fd ); close( infd ); continue; }
int result;
do result = ftruncate( fd, stream_pos );
while( result != 0 && errno == EINTR );
if( result != 0 )
{
show_file_error( filename, "Can't truncate file", errno );
close( fd ); close( infd ); set_retval( retval, 1 ); break;
}
if( close( fd ) != 0 || close( infd ) != 0 )
{
show_file_error( filename, "Error closing file", errno );
set_retval( retval, 1 ); break;
}
struct utimbuf t;
t.actime = in_stats.st_atime;
t.modtime = in_stats.st_mtime;
utime( filename, &t );
}
if( verbosity >= 1 )
{
if( member_list.damaged || member_list.range() )
std::fprintf( stderr, "%llu bytes removed from %ld %s from %d %s.\n",
removed_size,
members, ( members == 1 ) ? "member" : "members",
files, ( files == 1 ) ? "file" : "files" );
if( member_list.tdata )
std::fprintf( stderr, "%llu trailing bytes removed from %d %s.\n",
removed_tsize, tfiles, ( tfiles == 1 ) ? "file" : "files" );
}
return retval;
}
|
