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
|
/* Lziprecover - Data recovery tool for the lzip format
Copyright (C) 2009-2024 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 <cstdlib>
#include <cstring>
#include <string>
#include <vector>
#include <stdint.h>
#include <unistd.h>
#include <sys/stat.h>
#include "lzip.h"
#include "decoder.h"
#include "lzip_index.h"
namespace {
bool decompress_member( const int infd, const Cl_options & cl_opts,
const Pretty_print & pp, const unsigned long long mpos,
const unsigned long long outskip, const unsigned long long outend )
{
Range_decoder rdec( infd );
Lzip_header header;
rdec.read_data( header.data, header.size );
if( rdec.finished() ) // End Of File
{ pp( "File ends unexpectedly at member header." ); return false; }
if( !header.check_magic() ) { pp( bad_magic_msg ); return false; }
if( !header.check_version() )
{ pp( bad_version( header.version() ) ); return false; }
const unsigned dictionary_size = header.dictionary_size();
if( !isvalid_ds( dictionary_size ) ) { pp( bad_dict_msg ); return false; }
if( verbosity >= 2 ) pp();
LZ_decoder decoder( rdec, dictionary_size, outfd, outskip, outend );
const int result = decoder.decode_member( cl_opts, pp );
if( result != 0 )
{
if( verbosity >= 0 && result <= 2 )
{
pp();
std::fprintf( stderr, "%s at pos %llu\n", ( result == 2 ) ?
"File ends unexpectedly" : "Decoder error",
mpos + rdec.member_position() );
}
return false;
}
if( decoder.data_position() < outend - outskip )
{
if( verbosity >= 0 )
{ pp(); std::fprintf( stderr,
"%sMember at pos %llu contains only %llu bytes of %llu requested.\n",
( verbosity >= 2 ) ? "\n" : "", mpos,
decoder.data_position() - outskip, outend - outskip ); }
return false;
}
if( verbosity >= 2 ) std::fputs( "done\n", stderr );
return true;
}
} // end namespace
const char * format_num( unsigned long long num,
unsigned long long limit,
const int set_prefix )
{
enum { buffers = 8, bufsize = 32, n = 10 };
const char * const si_prefix[n] =
{ "k", "M", "G", "T", "P", "E", "Z", "Y", "R", "Q" };
const char * const binary_prefix[n] =
{ "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi", "Ri", "Qi" };
static char buffer[buffers][bufsize]; // circle of static buffers for printf
static int current = 0;
static bool si = true;
if( set_prefix ) si = ( set_prefix > 0 );
unsigned long long den = 1;
const unsigned factor = si ? 1000 : 1024;
char * const buf = buffer[current++]; current %= buffers;
const char * const * prefix = si ? si_prefix : binary_prefix;
const char * p = "";
for( int i = 0; i < n && num / den >= factor && den * factor > den; ++i )
{ if( num / den <= limit && num % ( den * factor ) != 0 ) break;
den *= factor; p = prefix[i]; }
if( num % den == 0 )
snprintf( buf, bufsize, "%llu %s", num / den, p );
else
snprintf( buf, bufsize, "%3.2f %s", (double)num / den, p );
return buf;
}
bool safe_seek( const int fd, const long long pos,
const char * const filename )
{
if( lseek( fd, pos, SEEK_SET ) == pos ) return true;
show_file_error( filename, "Seek error", errno );
return false;
}
int range_decompress( const std::string & input_filename,
const std::string & default_output_filename,
const Cl_options & cl_opts, Block range,
const bool force, const bool to_stdout )
{
const char * const filename = input_filename.c_str();
struct stat in_stats;
const int infd = open_instream( filename, &in_stats, false, true );
if( infd < 0 ) return 1;
const Lzip_index lzip_index( infd, cl_opts, cl_opts.ignore_errors,
cl_opts.ignore_errors );
if( lzip_index.retval() != 0 )
{ show_file_error( filename, lzip_index.error().c_str() );
return lzip_index.retval(); }
const long long udata_size = lzip_index.udata_size();
if( range.end() > udata_size )
range.size( std::max( 0LL, udata_size - range.pos() ) );
if( range.size() <= 0 )
{ if( udata_size > 0 ) show_file_error( filename, "Nothing to do." );
return 0; }
if( to_stdout || default_output_filename.empty() ) outfd = STDOUT_FILENO;
else
{
output_filename = default_output_filename;
set_signal_handler();
if( !open_outstream( force, true, false, false, true ) ) return 1;
}
if( verbosity >= 1 )
std::fprintf( stderr, "Decompressing range %sB to %sB (%sB of %sBytes)\n",
format_num( range.pos() ),
format_num( range.pos() + range.size() ),
format_num( range.size() ), format_num( udata_size ) );
Pretty_print pp( input_filename );
bool error = false;
for( long i = 0; i < lzip_index.members(); ++i )
{
const Block & db = lzip_index.dblock( i );
if( range.overlaps( db ) )
{
if( verbosity >= 3 && lzip_index.members() > 1 )
std::fprintf( stderr, "Decompressing member %3ld\n", i + 1 );
const long long outskip = std::max( 0LL, range.pos() - db.pos() );
const long long outend = std::min( db.size(), range.end() - db.pos() );
const long long mpos = lzip_index.mblock( i ).pos();
if( !safe_seek( infd, mpos, filename ) ) cleanup_and_fail( 1 );
if( !decompress_member( infd, cl_opts, pp, mpos, outskip, outend ) )
{ if( cl_opts.ignore_errors ) error = true; else cleanup_and_fail( 2 ); }
pp.reset();
}
}
if( close( infd ) != 0 )
{ show_file_error( filename, "Error closing input file", errno );
cleanup_and_fail( 1 ); }
if( !close_outstream( &in_stats ) ) cleanup_and_fail( 1 );
if( verbosity >= 2 && !error )
std::fputs( "Byte range decompressed successfully.\n", stderr );
return 0; // either no error or ignored
}
|