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/* Tarlz - Archiver with multimember lzip compression
Copyright (C) 2013-2025 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 <cstdio>
#include <stdint.h> // for lzlib.h
#include <unistd.h>
#include <lzlib.h>
#include "tarlz.h"
#include "arg_parser.h"
#include "lzip_index.h"
#include "archive_reader.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 Cl_options & cl_opts,
const Archive_descriptor & ad,
std::vector< char > & name_pending, const int outfd )
{
Archive_reader_i ar( ad ); // indexed reader
Resizable_buffer rbuf;
if( !rbuf.size() || ar.fatal() ) { show_error( mem_msg ); return 1; }
long long istream_pos = 0; // source of next data move
int retval = 0, retval2 = 0;
for( long i = 0; i < ad.lzip_index.members(); ++i )
{
if( ad.lzip_index.dblock( i ).size() == 0 ) continue; // empty lzip member
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
ar.set_member( i ); // prepare for new member
while( true ) // process one tar header per iteration
{
if( ar.data_pos() >= ar.mdata_end() )
{
if( ar.at_member_end() && !prev_extended ) break;
// member end exceeded or ends in extended
show_file_error( ad.namep, "Member misalignment found." );
retval = 2; goto done;
}
if( !prev_extended ) member_begin = ar.data_pos();
Tar_header header;
if( ( retval = ar.read( header, header_size ) ) != 0 )
{ show_file_error( ad.namep, ar.e_msg(), ar.e_code() ); goto done; }
if( !check_ustar_chksum( header ) ) // error or EOA
{
if( block_is_zero( header, header_size ) ) // EOA
{
if( prev_extended && !cl_opts.permissive )
{ show_file_error( ad.namep, fv_msg1 ); retval = 2; }
goto done;
}
// indexed archive reader does not check posix format
show_file_error( ad.namep, ( ar.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 && !cl_opts.permissive )
{ show_file_error( ad.namep, fv_msg2 ); retval = 2; goto done; }
Extended dummy; // global headers are parsed and ignored
retval = ar.parse_records( dummy, header, rbuf, gblrec_msg, true );
if( retval )
{ show_file_error( ad.namep, ar.e_msg(), ar.e_code() ); goto done; }
continue;
}
if( typeflag == tf_extended )
{
if( prev_extended && !cl_opts.permissive )
{ show_file_error( ad.namep, fv_msg3 ); retval = 2; goto done; }
if( ( retval = ar.parse_records( extended, header, rbuf, extrec_msg,
cl_opts.permissive ) ) != 0 )
{ show_file_error( ad.namep, ar.e_msg(), ar.e_code() ); goto done; }
if( !extended.crc_present() && cl_opts.missing_crc )
{ show_file_error( ad.namep, miscrc_msg ); retval = 2; goto done; }
prev_extended = true; continue;
}
prev_extended = false;
extended.fill_from_ustar( header ); // copy metadata from header
if( ( retval = ar.skip_member( extended ) ) != 0 ) goto done;
// delete tar member
if( !check_skip_filename( cl_opts, name_pending, extended.path().c_str() ) )
{
print_removed_prefix( extended.removed_prefix );
// check that members match
if( member_begin != ad.lzip_index.dblock( i ).pos() || !ar.at_member_end() )
{ show_file_error( extended.path().c_str(),
"Can't delete: not compressed individually." );
retval2 = 2; extended.reset(); continue; }
if( !show_member_name( extended, header, 1, rbuf ) )
{ retval = 1; goto done; }
const long long size = ad.lzip_index.mblock( i ).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; goto done; } }
else if( !safe_seek( ad.infd, istream_pos ) ||
!copy_file( ad.infd, outfd, ad.namep, size ) )
{ retval = 1; goto done; }
}
istream_pos = ad.lzip_index.mblock( i ).end(); // member end
}
extended.reset();
}
}
done:
if( retval < retval2 ) retval = retval2;
// tail copy keeps trailing data
return tail_copy( cl_opts.parser, ad, name_pending, istream_pos, outfd, retval );
}
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