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/* Tarlz - Archiver with multimember lzip compression
Copyright (C) 2013-2020 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 <climits>
#include <cstring>
#include <string>
#include <vector>
#include <stdint.h>
#include <unistd.h>
#include <lzlib.h>
#include "tarlz.h"
#include "lzip_index.h"
#include "archive_reader.h"
int Archive_reader_base::parse_records( Extended & extended,
const Tar_header header,
Resizable_buffer & rbuf,
const bool permissive )
{
const long long edsize = parse_octal( header + size_o, size_l );
const long long bufsize = round_up( edsize );
if( edsize <= 0 || edsize >= 1LL << 33 || bufsize >= INT_MAX )
return 1; // overflow or no extended data
if( !rbuf.resize( bufsize ) ) return 1; // extended records buffer
int retval = read( (uint8_t *)rbuf(), bufsize );
if( retval == 0 && !extended.parse( rbuf(), edsize, permissive ) )
retval = 2;
return retval;
}
/* Read 'size' uncompressed bytes, decompressing the input if needed.
Return value: 0 = OK, 1 = damaged member, 2 = fatal error. */
int Archive_reader::read( uint8_t * const buf, const int size )
{
if( fatal_ ) return err( 2 );
if( first_read ) // check format
{
first_read = false;
uncompressed_seekable = ad.seekable && !ad.indexed &&
ad.lzip_index.file_size() > 3 * header_size;
if( size != header_size )
internal_error( "size != header_size on first call." );
const int rd = readblock( ad.infd, buf, size );
if( rd != size && errno )
return err( 2, "Error reading archive", errno, rd );
const Lzip_header & header = (*(const Lzip_header *)buf);
const bool islz = ( rd >= min_member_size && header.verify_magic() &&
header.verify_version() &&
isvalid_ds( header.dictionary_size() ) );
const bool istar = ( rd == size && verify_ustar_chksum( buf ) );
const bool iseof =
( !islz && !istar && rd == size && block_is_zero( buf, size ) );
bool maybe_lz = islz; // maybe corrupt tar.lz
if( !islz && !istar && !iseof ) // corrupt or invalid format
{
const bool lz_ext = has_lz_ext( ad.name );
show_file_error( ad.namep, lz_ext ? posix_lz_msg : posix_msg );
if( lz_ext && rd >= min_member_size ) maybe_lz = true;
else return err( 1 );
}
if( !maybe_lz ) // uncompressed
{ if( rd == size ) return 0;
return err( 2, "EOF reading archive", 0, rd ); }
uncompressed_seekable = false; // compressed
decoder = LZ_decompress_open();
if( !decoder || LZ_decompress_errno( decoder ) != LZ_ok )
return err( 2, mem_msg );
if( LZ_decompress_write( decoder, buf, rd ) != rd )
internal_error( "library error (LZ_decompress_write)." );
const int ret = read( buf, size ); if( ret != 0 ) return ret;
if( verify_ustar_chksum( buf ) || block_is_zero( buf, size ) ) return 0;
return err( 2, islz ? posix_lz_msg : "" );
}
if( !decoder ) // uncompressed
{
const int rd = readblock( ad.infd, buf, size );
if( rd == size ) return 0; else return err( 2, end_msg, 0, rd );
}
const int ibuf_size = 16384;
uint8_t ibuf[ibuf_size];
int sz = 0;
while( sz < size )
{
const int rd = LZ_decompress_read( decoder, buf + sz, size - sz );
if( rd < 0 )
{
const unsigned long long old_pos = LZ_decompress_total_in_size( decoder );
if( LZ_decompress_sync_to_member( decoder ) < 0 )
internal_error( "library error (LZ_decompress_sync_to_member)." );
e_skip_ = true; set_error_status( 2 );
const unsigned long long new_pos = LZ_decompress_total_in_size( decoder );
// lzlib < 1.8 does not update total_in_size when syncing to member
if( new_pos >= old_pos && new_pos < LLONG_MAX )
return err( 1, "", 0, sz, true );
return err( 2, "Skipping to next header failed. "
"Lzlib 1.8 or newer required.", 0, sz );
}
if( rd == 0 && LZ_decompress_finished( decoder ) == 1 )
{ return err( 2, end_msg, 0, sz ); }
sz += rd;
if( sz < size && !at_eof && LZ_decompress_write_size( decoder ) > 0 )
{
const int rsize = std::min( ibuf_size, LZ_decompress_write_size( decoder ) );
const int rd = readblock( ad.infd, ibuf, rsize );
if( LZ_decompress_write( decoder, ibuf, rd ) != rd )
internal_error( "library error (LZ_decompress_write)." );
if( rd < rsize )
{
at_eof = true; LZ_decompress_finish( decoder );
if( errno ) return err( 2, "Error reading archive.", errno, sz );
}
}
}
return 0;
}
int Archive_reader::skip_member( const Extended & extended )
{
long long rest = round_up( extended.file_size() ); // size + padding
if( uncompressed_seekable && lseek( ad.infd, rest, SEEK_CUR ) > 0 )
return 0;
const int bufsize = 32 * header_size;
uint8_t buf[bufsize];
while( rest > 0 ) // skip tar member
{
const int rsize = ( rest >= bufsize ) ? bufsize : rest;
const int ret = read( buf, rsize );
if( ret != 0 ) return ret;
rest -= rsize;
}
return 0;
}
void Archive_reader_i::set_member( const long i )
{
LZ_decompress_reset( decoder ); // prepare for new member
data_pos_ = ad.lzip_index.dblock( i ).pos();
mdata_end = ad.lzip_index.dblock( i ).end();
archive_pos = ad.lzip_index.mblock( i ).pos();
member_id = i;
}
/* Read 'size' decompressed bytes from the archive.
Return value: 0 = OK, 1 = damaged member, 2 = fatal error. */
int Archive_reader_i::read( uint8_t * const buf, const int size )
{
int sz = 0;
while( sz < size )
{
const int rd = LZ_decompress_read( decoder, buf + sz, size - sz );
if( rd < 0 )
return err( 1, LZ_strerror( LZ_decompress_errno( decoder ) ) );
if( rd == 0 && LZ_decompress_finished( decoder ) == 1 )
return err( 2, end_msg );
sz += rd; data_pos_ += rd;
if( sz < size && LZ_decompress_write_size( decoder ) > 0 )
{
const long long ibuf_size = 16384;
uint8_t ibuf[ibuf_size];
const long long member_end = ad.lzip_index.mblock( member_id ).end();
const long long rest = ( ( archive_pos < member_end ) ?
member_end : ad.lzip_index.cdata_size() ) - archive_pos;
const int rsize = std::min( LZ_decompress_write_size( decoder ),
(int)std::min( ibuf_size, rest ) );
if( rsize <= 0 ) LZ_decompress_finish( decoder );
else
{
const int rd = preadblock( ad.infd, ibuf, rsize, archive_pos );
if( LZ_decompress_write( decoder, ibuf, rd ) != rd )
internal_error( "library error (LZ_decompress_write)." );
archive_pos += rd;
if( rd < rsize )
{
LZ_decompress_finish( decoder );
if( errno ) return err( 2, "Error reading archive" );
}
}
}
}
return 0;
}
int Archive_reader_i::skip_member( const Extended & extended )
{
long long rest = round_up( extended.file_size() ); // size + padding
if( data_pos_ + rest == mdata_end ) { data_pos_ = mdata_end; return 0; }
const int bufsize = 32 * header_size;
uint8_t buf[bufsize];
while( rest > 0 ) // skip tar member
{
const int rsize = ( rest >= bufsize ) ? bufsize : rest;
const int ret = read( buf, rsize );
if( ret != 0 ) return ret;
rest -= rsize;
}
return 0;
}
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