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/* Lziprecover - Data recovery tool for the lzip format
Copyright (C) 2009-2021 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;
}
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;
}
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