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/* Clzip - LZMA lossless data compressor
Copyright (C) 2010-2023 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/>.
*/
struct FLZ_encoder
{
struct LZ_encoder_base eb;
unsigned key4; /* key made from latest 4 bytes */
};
static inline void FLZe_reset_key4( struct FLZ_encoder * const fe )
{
int i;
fe->key4 = 0;
for( i = 0; i < 3 && i < Mb_available_bytes( &fe->eb.mb ); ++i )
fe->key4 = ( fe->key4 << 4 ) ^ fe->eb.mb.buffer[i];
}
int FLZe_longest_match_len( struct FLZ_encoder * const fe, int * const distance );
static inline void FLZe_update_and_move( struct FLZ_encoder * const fe, int n )
{
struct Matchfinder_base * const mb = &fe->eb.mb;
while( --n >= 0 )
{
if( Mb_available_bytes( mb ) >= 4 )
{
fe->key4 = ( ( fe->key4 << 4 ) ^ mb->buffer[mb->pos+3] ) & mb->key4_mask;
mb->pos_array[mb->cyclic_pos] = mb->prev_positions[fe->key4];
mb->prev_positions[fe->key4] = mb->pos + 1;
}
Mb_move_pos( mb );
}
}
static inline bool FLZe_init( struct FLZ_encoder * const fe,
const int ifd, const int outfd )
{
enum { before_size = 0,
dict_size = 65536,
/* bytes to keep in buffer after pos */
after_size = max_match_len,
dict_factor = 16,
num_prev_positions23 = 0,
pos_array_factor = 1 };
return LZeb_init( &fe->eb, before_size, dict_size, after_size, dict_factor,
num_prev_positions23, pos_array_factor, ifd, outfd );
}
static inline void FLZe_reset( struct FLZ_encoder * const fe )
{ LZeb_reset( &fe->eb ); }
bool FLZe_encode_member( struct FLZ_encoder * const fe,
const unsigned long long member_size );
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