diff options
Diffstat (limited to 'decoder.c')
| -rw-r--r-- | decoder.c | 21 |
1 files changed, 7 insertions, 14 deletions
@@ -1,5 +1,5 @@ /* Lzlib - Compression library for the lzip format - Copyright (C) 2009-2021 Antonio Diaz Diaz. + Copyright (C) 2009-2022 Antonio Diaz Diaz. This library is free software. Redistribution and use in source and binary forms, with or without modification, are permitted provided @@ -49,8 +49,6 @@ static int LZd_decode_member( struct LZ_decoder * const d ) while( !Rd_finished( rdec ) ) { - int len; - const int pos_state = LZd_data_position( d ) & pos_state_mask; /* const unsigned mpos = rdec->member_position; if( mpos - old_mpos > rd_min_available_bytes ) return 5; old_mpos = mpos; */ @@ -58,23 +56,19 @@ static int LZd_decode_member( struct LZ_decoder * const d ) { if( !rdec->at_stream_end ) return 0; if( Cb_empty( &rdec->cb ) ) break; } /* decode until EOF */ if( !LZd_enough_free_bytes( d ) ) return 0; + const int pos_state = LZd_data_position( d ) & pos_state_mask; if( Rd_decode_bit( rdec, &d->bm_match[*state][pos_state] ) == 0 ) /* 1st bit */ { /* literal byte */ Bit_model * const bm = d->bm_literal[get_lit_state(LZd_peek_prev( d ))]; - if( St_is_char( *state ) ) - { - *state -= ( *state < 4 ) ? *state : 3; + if( ( *state = St_set_char( *state ) ) < 4 ) LZd_put_byte( d, Rd_decode_tree8( rdec, bm ) ); - } else - { - *state -= ( *state < 10 ) ? 3 : 6; LZd_put_byte( d, Rd_decode_matched( rdec, bm, LZd_peek( d, d->rep0 ) ) ); - } continue; } /* match or repeated match */ + int len; if( Rd_decode_bit( rdec, &d->bm_rep[*state] ) != 0 ) /* 2nd bit */ { if( Rd_decode_bit( rdec, &d->bm_rep0[*state] ) == 0 ) /* 3rd bit */ @@ -100,13 +94,12 @@ static int LZd_decode_member( struct LZ_decoder * const d ) d->rep0 = distance; } *state = St_set_rep( *state ); - len = min_match_len + Rd_decode_len( rdec, &d->rep_len_model, pos_state ); + len = Rd_decode_len( rdec, &d->rep_len_model, pos_state ); } else /* match */ { - unsigned distance; - len = min_match_len + Rd_decode_len( rdec, &d->match_len_model, pos_state ); - distance = Rd_decode_tree6( rdec, d->bm_dis_slot[get_len_state(len)] ); + len = Rd_decode_len( rdec, &d->match_len_model, pos_state ); + unsigned distance = Rd_decode_tree6( rdec, d->bm_dis_slot[get_len_state(len)] ); if( distance >= start_dis_model ) { const unsigned dis_slot = distance; |