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/* Tarlz - Archiver with multimember lzip compression
Copyright (C) 2013-2026 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 <unistd.h>
#include "tarlz.h"
#include <lzlib.h> // uint8_t defined in tarlz.h
#include "arg_parser.h"
#include "lzip_index.h"
#include "archive_reader.h"
#include "decode.h"
bool safe_seek( const int fd, const long long pos )
{
if( lseek( fd, pos, SEEK_SET ) == pos ) return true;
show_error( seek_msg, errno ); return false;
}
int tail_copy( const Arg_parser & parser, const Archive_descriptor & ad,
Cl_names & cl_names, const long long istream_pos,
const int outfd, int retval )
{
const long long rest = ad.lzip_index.file_size() - istream_pos;
if( istream_pos > 0 && rest > 0 &&
( !safe_seek( ad.infd, istream_pos ) ||
!copy_file( ad.infd, outfd, ad.namep, rest ) ) )
{ show_file_error( ad.namep, "Error during tail copy." );
return retval ? retval : 1; }
const long long ostream_pos = lseek( outfd, 0, SEEK_CUR );
if( ostream_pos < 0 )
{ show_file_error( ad.namep, seek_msg, errno ); retval = 1; }
else if( ostream_pos > 0 && ostream_pos < ad.lzip_index.file_size() )
{
int ret;
do ret = ftruncate( outfd, ostream_pos );
while( ret != 0 && errno == EINTR );
if( ret != 0 || lseek( outfd, 0, SEEK_END ) != ostream_pos )
{
show_file_error( ad.namep, "Can't truncate archive", errno );
if( retval < 1 ) retval = 1;
}
}
if( ( close( outfd ) | close( ad.infd ) ) != 0 && retval == 0 )
{ show_file_error( ad.namep, eclosa_msg, errno ); retval = 1; }
if( retval == 0 && cl_names.names_remain( parser ) ) set_error_status( 1 );
return final_exit_status( retval );
}
/* Deleting from a corrupt archive must not worsen the corruption. Stop and
tail-copy as soon as corruption is found.
*/
int delete_members( const Cl_options & cl_opts )
{
if( cl_opts.num_files == 0 && !cl_opts.option_T_present )
{ if( verbosity >= 1 ) show_error( "Nothing to delete." ); return 0; }
if( cl_opts.archive_name.empty() )
{ show_error( "Deleting from stdin not implemented yet." ); return 1; }
const Archive_descriptor ad( cl_opts.archive_name );
if( ad.infd < 0 ) return 1;
if( ad.name.size() && ad.indexed && ad.lzip_index.multi_empty() )
{ show_file_error( ad.namep, empty_member_msg ); close( ad.infd ); return 2; }
const int outfd = open_outstream( cl_opts.archive_name, false );
if( outfd < 0 ) { close( ad.infd ); return 1; }
// member names to be deleted
Cl_names cl_names( cl_opts.parser );
if( ad.indexed ) // archive is a compressed regular file
return delete_members_lz( cl_opts, ad, cl_names, outfd );
if( !ad.seekable )
{ show_file_error( ad.namep, "Archive is not seekable." ); return 1; }
if( ad.lzip_index.file_size() < 3 * header_size )
{ show_file_error( ad.namep, has_lz_ext( ad.name ) ?
posix_lz_msg : posix_msg ); return 2; }
// archive is uncompressed seekable, unless compressed corrupt
Archive_reader ar( ad ); // serial reader
Resizable_buffer rbuf;
long long istream_pos = 0; // source of next data move
long long member_begin = 0; // first pos of current tar member
Extended extended; // metadata from extended records
int retval = 0;
bool prev_extended = false; // prev header was extended
if( !rbuf.size() ) { show_error( mem_msg ); return 1; }
while( true ) // process one tar header per iteration
{
if( !prev_extended && ( member_begin = lseek( ad.infd, 0, SEEK_CUR ) ) < 0 )
{ show_file_error( ad.namep, seek_msg, errno ); retval = 1; break; }
Tar_header header;
if( ( retval = ar.read( header, header_size ) ) != 0 )
{ show_file_error( ad.namep, ar.e_msg(), ar.e_code() ); break; }
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; }
break;
}
// posix format already checked by archive reader
show_file_error( ad.namep, bad_hdr_msg );
retval = 2; break;
}
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; break; }
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() ); break; }
continue;
}
if( typeflag == tf_extended )
{
if( prev_extended && !cl_opts.permissive )
{ show_file_error( ad.namep, fv_msg3 ); retval = 2; break; }
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() ); break; }
if( !extended.crc_present() && cl_opts.missing_crc )
{ show_file_error( ad.namep, miscrc_msg ); retval = 2; break; }
prev_extended = true; continue;
}
prev_extended = false;
extended.fill_from_ustar( header ); // copy metadata from header
if( ( retval = ar.skip_member( extended ) ) != 0 )
{ show_file_error( ad.namep, seek_msg, errno ); break; }
// delete tar member
if( !check_skip_filename( cl_opts, cl_names, extended.path().c_str() ) )
{
print_removed_prefix( extended.removed_prefix );
if( !show_member_name( extended, header, 1, rbuf ) )
{ retval = 1; break; }
const long long pos = lseek( ad.infd, 0, SEEK_CUR );
if( pos <= 0 || pos <= member_begin || member_begin < istream_pos )
{ show_file_error( ad.namep, seek_msg, errno ); retval = 1; break; }
const long long size = member_begin - 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( ad.infd, istream_pos ) ||
!copy_file( ad.infd, outfd, ad.namep, size ) ||
!safe_seek( ad.infd, pos ) ) { retval = 1; break; }
}
istream_pos = pos;
}
extended.reset();
}
return tail_copy( cl_opts.parser, ad, cl_names, istream_pos, outfd, retval );
}
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