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/* Tarlz - Archiver with multimember lzip compression
Copyright (C) 2013-2019 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 <cctype>
#include <cerrno>
#include <climits>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <string>
#include <vector>
#include <pthread.h>
#include <stdint.h>
#include <unistd.h>
#include <lzlib.h>
#include "arg_parser.h"
#include "lzip_index.h"
#include "tarlz.h"
/* Deleting from a corrupt archive must not worsen the corruption. Stop and
tail-copy as soon as corruption is found. */
int delete_members_lz( const char * const archive_namep,
const Arg_parser & parser,
std::vector< char > & name_pending,
const Lzip_index & lzip_index,
const int filenames, const int infd, const int outfd,
const bool missing_crc, const bool permissive )
{
Resizable_buffer rbuf;
LZ_Decoder * const decoder = LZ_decompress_open();
if( !rbuf.size() || !decoder || LZ_decompress_errno( decoder ) != LZ_ok )
{ show_error( mem_msg ); return 1; }
long long istream_pos = 0; // source of next data move
const long long cdata_size = lzip_index.cdata_size();
int retval = 0;
for( long i = 0; i < lzip_index.members(); ++i )
{
const long long mdata_pos = lzip_index.dblock( i ).pos();
long long data_pos = mdata_pos;
const long long mdata_end = lzip_index.dblock( i ).end();
if( data_pos >= mdata_end ) continue; // empty lzip member
const long long member_pos = lzip_index.mblock( i ).pos();
long long file_pos = member_pos;
const long long member_end = lzip_index.mblock( i ).end();
long long member_begin = 0; // first pos of current tar member
Extended extended; // metadata from extended records
bool prev_extended = false; // prev header was extended
LZ_decompress_reset( decoder ); // prepare for new member
if( !safe_seek( infd, member_pos ) ) { retval = 1; break; }
while( true ) // process one tar header per iteration
{
if( data_pos >= mdata_end )
{
if( data_pos == mdata_end && !prev_extended ) break;
// member end exceeded or ends in extended
show_file_error( archive_namep, "Member misalignment found." );
retval = 2; goto done;
}
if( !prev_extended ) member_begin = data_pos;
Tar_header header;
const char * msg = 0;
retval = archive_read_lz( decoder, infd, file_pos, member_end,
cdata_size, header, header_size, &msg );
if( retval != 0 ) { show_file_error( archive_namep, msg ); goto done; }
data_pos += header_size;
if( !verify_ustar_chksum( header ) )
{
if( block_is_zero( header, header_size ) ) // EOF
{
if( prev_extended && !permissive )
{ show_file_error( archive_namep, fv_msg1 ); retval = 2; }
goto done;
}
show_file_error( archive_namep, ( data_pos > header_size ) ?
bad_hdr_msg : posix_lz_msg );
retval = 2;
goto done;
}
const Typeflag typeflag = (Typeflag)header[typeflag_o];
if( typeflag == tf_global )
{
if( prev_extended && !permissive )
{ show_file_error( archive_namep, fv_msg2 ); retval = 2; goto done; }
Extended dummy; // global headers are parsed and ignored
retval = parse_records_lz( decoder, infd, file_pos, member_end,
cdata_size, data_pos, dummy, header,
rbuf, &msg, true );
if( retval == 0 ) continue;
show_file_error( archive_namep, msg ? msg : gblrec_msg );
goto done;
}
if( typeflag == tf_extended )
{
if( prev_extended && !permissive ) { msg = fv_msg3; retval = 2; }
else retval = parse_records_lz( decoder, infd, file_pos, member_end,
cdata_size, data_pos, extended, header,
rbuf, &msg, permissive );
if( retval == 0 && !extended.crc_present() && missing_crc )
{ msg = mcrc_msg; retval = 2; }
if( retval == 0 ) { prev_extended = true; continue; }
show_file_error( archive_namep, msg ? msg : extrec_msg );
goto done;
}
prev_extended = false;
extended.fill_from_ustar( header ); // copy metadata from header
long long rest = extended.file_size();
const int rem = rest % header_size;
if( rem ) rest += header_size - rem; // padding
if( data_pos + rest >= mdata_end ) data_pos += rest;
else // skip tar member
if( ( retval = skip_member_lz( decoder, infd, file_pos, member_end,
cdata_size, data_pos, rest, &msg ) ) != 0 )
goto done;
if( !check_skip_filename( parser, name_pending, extended.path().c_str(),
filenames ) ) // delete tar member
{
// verify that members match
if( member_begin != mdata_pos || data_pos != mdata_end )
{ show_file_error( extended.path().c_str(),
"Can't delete: not individually compressed." );
retval = 2; extended.reset(); continue; }
if( !show_member_name( extended, header, 1, rbuf ) )
{ retval = 1; goto done; }
const long long size = member_pos - istream_pos;
if( size > 0 ) // move pending data each time a member is deleted
{
if( istream_pos == 0 )
{ if( !safe_seek( outfd, size ) ) { retval = 1; break; } }
else if( !safe_seek( infd, istream_pos ) ||
!copy_file( infd, outfd, size ) ) { retval = 1; break; }
}
istream_pos = member_end;
}
extended.reset();
}
}
done:
if( LZ_decompress_close( decoder ) < 0 && !retval )
{ show_error( "LZ_decompress_close failed." ); retval = 1; }
// tail copy keeps trailing data
return tail_copy( archive_namep, parser, name_pending, lzip_index,
istream_pos, infd, outfd, retval );
}
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