-
Notifications
You must be signed in to change notification settings - Fork 15
/
genbook.cc
211 lines (190 loc) · 6.72 KB
/
genbook.cc
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
/* GNU ddrescue - Data recovery tool
Copyright (C) 2004-2019 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 <ctime>
#include <string>
#include <vector>
#include <stdint.h>
#include <unistd.h>
#include "block.h"
#include "mapbook.h"
const char * format_time( const long t, const bool low_prec )
{
enum { buffers = 8, bufsize = 16 };
static char buffer[buffers][bufsize]; // circle of static buffers for printf
static int current = 0;
if( t < 0 ) return "n/a";
char * const buf = buffer[current++]; current %= buffers;
const int s = t % 60;
const int m = ( t / 60 ) % 60;
const int h = ( t / 3600 ) % 24;
const long d = t / 86400;
int len = 0; // max len is 11 chars (10h 10m 10s)
if( d > 0 ) len = snprintf( buf, bufsize, "%ldd", d );
if( h > 0 && len >= 0 && len <= 7 )
len += snprintf( buf + len, bufsize - len, "%s%dh", len ? ( (h < 10) ? " " : " " ) : "", h );
if( m > 0 && len >= 0 && len <= 7 )
len += snprintf( buf + len, bufsize - len, "%s%dm", len ? ( (m < 10) ? " " : " " ) : "", m );
if( ( s > 0 && len >= 0 && len <= 7 && !low_prec ) || len == 0 )
len += snprintf( buf + len, bufsize - len, "%s%ds", len ? ( (s < 10) ? " " : " " ) : "", s );
return buf;
}
// If copied_size + error_size < b.size(), it means EOF has been reached.
//
void Genbook::check_block( const Block & b, int & copied_size, int & error_size )
{
if( b.size() <= 0 ) internal_error( "bad size checking a Block." );
copied_size = readblockp( odes_, iobuf(), b.size(), b.pos() + offset() );
if( errno ) error_size = b.size() - copied_size;
for( int pos = 0; pos < copied_size; )
{
const int size = std::min( hardbs(), copied_size - pos );
if( !block_is_zero( iobuf() + pos, size ) )
{
change_chunk_status( Block( b.pos() + pos, size ),
Sblock::finished, domain() );
finished_size += size;
}
gensize += size;
pos += size;
}
}
// Return values: 1 unexpected EOF, 0 OK, -1 interrupted, -2 mapfile error.
//
int Genbook::check_all()
{
const char * const msg = "Generating mapfile...";
long long pos = ( offset() >= 0 ) ? 0 : -offset();
if( current_status() == generating && domain().includes( current_pos() ) &&
( offset() >= 0 || current_pos() >= -offset() ) )
pos = current_pos();
bool first_post = true;
while( pos >= 0 )
{
Block b( pos, softbs() );
find_chunk( b, Sblock::non_tried, domain(), hardbs() );
if( b.size() <= 0 ) break;
pos = b.end();
current_status( generating, msg );
current_pos( b.pos() );
if( verbosity >= 0 )
{ show_status( b.pos(), msg, first_post ); first_post = false; }
if( interrupted() ) return -1;
int copied_size = 0, error_size = 0;
check_block( b, copied_size, error_size );
if( copied_size + error_size < b.size() && // EOF
!truncate_vector( b.pos() + copied_size + error_size ) )
{ final_msg( "EOF found below the size calculated from mapfile" );
return 1; }
if( !update_mapfile() ) return -2;
}
return 0;
}
void Genbook::show_status( const long long ipos, const char * const msg,
bool force )
{
const char * const up = "\x1B[A";
if( t0 == 0 )
{
t0 = t1 = initial_time();
first_size = last_size = gensize;
force = true;
std::fputs( "\n\n", stdout );
}
if( ipos >= 0 ) last_ipos = ipos;
const long t2 = std::time( 0 );
if( t2 < t1 ) // clock jumped back
{
t0 -= std::min( t0, t1 - t2 );
t1 = t2;
}
if( t2 > t1 || force )
{
if( t2 > t1 )
{
a_rate = ( gensize - first_size ) / ( t2 - t0 );
c_rate = ( gensize - last_size ) / ( t2 - t1 );
t1 = t2;
last_size = gensize;
}
std::printf( "\r%s%s", up, up );
std::printf( "rescued: %9sB, generated: %9sB, current rate: %8sB/s\n",
format_num( finished_size ), format_num( gensize ),
format_num( c_rate, 99999 ) );
std::printf( " opos: %9sB, run time: %11s, average rate: %8sB/s\n",
format_num( last_ipos + offset() ), format_time( t1 - t0 ),
format_num( a_rate, 99999 ) );
if( msg && msg[0] )
{
const int len = std::strlen( msg ); std::printf( "\r%s", msg );
for( int i = len; i < oldlen; ++i ) std::fputc( ' ', stdout );
oldlen = len;
}
std::fflush( stdout );
}
}
// Return values: 1 write error, 0 OK.
//
int Genbook::do_generate( const int odes )
{
finished_size = 0; gensize = 0;
odes_ = odes;
for( long i = 0; i < sblocks(); ++i )
{
const Sblock & sb = sblock( i );
if( !domain().includes( sb ) )
{ if( domain() < sb ) break; else continue; }
if( sb.status() == Sblock::finished ) finished_size += sb.size();
if( sb.status() != Sblock::non_tried ) gensize += sb.size();
}
set_signals();
if( verbosity >= 0 )
{
std::fputs( "Press Ctrl-C to interrupt\n", stdout );
if( mapfile_exists() )
{
std::fputs( "Initial status (read from mapfile)\n", stdout );
std::printf( "rescued: %9sB, generated: %9sB\n",
format_num( finished_size ), format_num( gensize ) );
std::fputs( "Current status\n", stdout );
}
}
int retval = check_all();
const bool signaled = ( retval == -1 );
if( signaled ) retval = 0;
if( verbosity >= 0 )
{
show_status( -1, ( retval || signaled ) ? 0 : "Finished", true );
if( retval == -2 ) std::fputs( "\nMapfile error", stdout );
else if( signaled ) std::fputs( "\nInterrupted by user", stdout );
std::fputc( '\n', stdout );
std::fflush( stdout );
}
if( retval == -2 ) retval = 1; // mapfile error
else
{
if( retval == 0 && !signaled ) current_status( finished );
compact_sblock_vector();
if( !update_mapfile( -1, true ) && retval == 0 ) retval = 1;
}
if( final_msg().size() ) show_error( final_msg().c_str(), final_errno() );
if( retval ) return retval; // errors have priority over signals
if( signaled ) return signaled_exit();
return 0;
}