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/* Lziprecover - Data recovery tool for the lzip format
Copyright (C) 2009-2023 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/>.
*/
namespace {
const char * const program_year = "2023";
void show_version()
{
std::printf( "%s %s\n", program_name, PROGVERSION );
std::printf( "Copyright (C) %s Antonio Diaz Diaz.\n", program_year );
std::printf( "License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>\n"
"This is free software: you are free to change and redistribute it.\n"
"There is NO WARRANTY, to the extent permitted by law.\n" );
}
// separate numbers of 5 or more digits in groups of 3 digits using '_'
const char * format_num3( long long num )
{
const char * const si_prefix = "kMGTPEZY";
const char * const binary_prefix = "KMGTPEZY";
enum { buffers = 8, bufsize = 4 * sizeof num };
static char buffer[buffers][bufsize]; // circle of static buffers for printf
static int current = 0;
char * const buf = buffer[current++]; current %= buffers;
char * p = buf + bufsize - 1; // fill the buffer backwards
*p = 0; // terminator
const bool negative = num < 0;
char prefix = 0; // try binary first, then si
for( int i = 0; i < 8 && num != 0 && ( num / 1024 ) * 1024 == num; ++i )
{ num /= 1024; prefix = binary_prefix[i]; }
if( prefix ) *(--p) = 'i';
else
for( int i = 0; i < 8 && num != 0 && ( num / 1000 ) * 1000 == num; ++i )
{ num /= 1000; prefix = si_prefix[i]; }
if( prefix ) *(--p) = prefix;
const bool split = num >= 10000 || num <= -10000;
for( int i = 0; ; )
{
long long onum = num; num /= 10;
*(--p) = llabs( onum - ( 10 * num ) ) + '0'; if( num == 0 ) break;
if( split && ++i >= 3 ) { i = 0; *(--p) = '_'; }
}
if( negative ) *(--p) = '-';
return p;
}
void show_option_error( const char * const arg, const char * const msg,
const char * const option_name )
{
if( verbosity >= 0 )
std::fprintf( stderr, "%s: '%s': %s option '%s'.\n",
program_name, arg, msg, option_name );
}
// Recognized formats: <num>[YZEPTGM][i][Bs], <num>k[Bs], <num>Ki[Bs]
//
long long getnum( const char * const arg, const char * const option_name,
const int hardbs, const long long llimit = LLONG_MIN,
const long long ulimit = LLONG_MAX,
const char ** const tailp = 0 )
{
char * tail;
errno = 0;
long long result = strtoll( arg, &tail, 0 );
if( tail == arg )
{ show_option_error( arg, "Bad or missing numerical argument in",
option_name ); std::exit( 1 ); }
if( !errno && tail[0] )
{
char * const p = tail++;
int factor = 1000; // default factor
int exponent = -1; // -1 = bad multiplier
char usuf = 0; // 'B' or 's' unit suffix is present
switch( *p )
{
case 'Q': exponent = 10; break;
case 'R': exponent = 9; break;
case 'Y': exponent = 8; break;
case 'Z': exponent = 7; break;
case 'E': exponent = 6; break;
case 'P': exponent = 5; break;
case 'T': exponent = 4; break;
case 'G': exponent = 3; break;
case 'M': exponent = 2; break;
case 'K': if( tail[0] == 'i' ) { ++tail; factor = 1024; exponent = 1; } break;
case 'k': if( tail[0] != 'i' ) exponent = 1; break;
case 'B':
case 's': usuf = *p; exponent = 0; break;
default : if( tailp ) { tail = p; exponent = 0; }
}
if( exponent > 1 && tail[0] == 'i' ) { ++tail; factor = 1024; }
if( exponent > 0 && usuf == 0 && ( tail[0] == 'B' || tail[0] == 's' ) )
{ usuf = tail[0]; ++tail; }
if( exponent < 0 || ( usuf == 's' && hardbs <= 0 ) ||
( !tailp && tail[0] != 0 ) )
{ show_option_error( arg, "Bad multiplier in numerical argument of",
option_name ); std::exit( 1 ); }
for( int i = 0; i < exponent; ++i )
{
if( ( result >= 0 && LLONG_MAX / factor >= result ) ||
( result < 0 && LLONG_MIN / factor <= result ) ) result *= factor;
else { errno = ERANGE; break; }
}
if( usuf == 's' )
{
if( ( result >= 0 && LLONG_MAX / hardbs >= result ) ||
( result < 0 && LLONG_MIN / hardbs <= result ) ) result *= hardbs;
else errno = ERANGE;
}
}
if( !errno && ( result < llimit || result > ulimit ) ) errno = ERANGE;
if( errno )
{
if( verbosity >= 0 )
std::fprintf( stderr, "%s: '%s': Value out of limits [%s,%s] in "
"option '%s'.\n", program_name, arg, format_num3( llimit ),
format_num3( ulimit ), option_name );
std::exit( 1 );
}
if( tailp ) *tailp = tail;
return result;
}
} // end namespace
// Recognized formats: <pos>,<value> <pos>,+<value> <pos>,f<value>
//
void Bad_byte::parse_bb( const char * const arg, const char * const pn )
{
argument = arg;
option_name = pn;
const char * tail;
pos = getnum( arg, option_name, 0, 0, LLONG_MAX, &tail );
if( tail[0] != ',' )
{ show_option_error( arg, ( tail[0] == 0 ) ? "Missing <val> in" :
"Missing comma between <pos> and <val> in",
option_name ); std::exit( 1 ); }
if( tail[1] == '+' ) { ++tail; mode = delta; }
else if( tail[1] == 'f' ) { ++tail; mode = flip; }
else mode = literal;
value = getnum( tail + 1, option_name, 0, 0, 255 );
}
void show_error( const char * const msg, const int errcode, const bool help )
{
if( verbosity < 0 ) return;
if( msg && msg[0] )
std::fprintf( stderr, "%s: %s%s%s\n", program_name, msg,
( errcode > 0 ) ? ": " : "",
( errcode > 0 ) ? std::strerror( errcode ) : "" );
if( help )
std::fprintf( stderr, "Try '%s --help' for more information.\n",
invocation_name );
}
void show_file_error( const char * const filename, const char * const msg,
const int errcode )
{
if( verbosity >= 0 )
std::fprintf( stderr, "%s: %s: %s%s%s\n", program_name, filename, msg,
( errcode > 0 ) ? ": " : "",
( errcode > 0 ) ? std::strerror( errcode ) : "" );
}
void internal_error( const char * const msg )
{
if( verbosity >= 0 )
std::fprintf( stderr, "%s: internal error: %s\n", program_name, msg );
std::exit( 3 );
}
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