diff options
Diffstat (limited to '')
-rw-r--r-- | decoder.c | 73 |
1 files changed, 36 insertions, 37 deletions
@@ -30,15 +30,15 @@ static bool LZd_verify_trailer( struct LZ_decoder * const decoder ) File_trailer trailer; const int trailer_size = Ft_versioned_size( decoder->member_version ); const unsigned long long member_size = - decoder->range_decoder->member_position + trailer_size; + decoder->rdec->member_position + trailer_size; - int size = Rd_read_data( decoder->range_decoder, trailer, trailer_size ); + int size = Rd_read_data( decoder->rdec, trailer, trailer_size ); if( size < trailer_size ) return false; if( decoder->member_version == 0 ) Ft_set_member_size( trailer, member_size ); - return ( decoder->range_decoder->code == 0 && + return ( decoder->rdec->code == 0 && Ft_get_data_crc( trailer ) == LZd_crc( decoder ) && Ft_get_data_size( trailer ) == LZd_data_position( decoder ) && Ft_get_member_size( trailer ) == member_size ); @@ -51,105 +51,104 @@ static int LZd_decode_member( struct LZ_decoder * const decoder ) { State * const state = &decoder->state; if( decoder->member_finished ) return 0; - if( !Rd_try_reload( decoder->range_decoder, false ) ) return 0; + if( !Rd_try_reload( decoder->rdec, false ) ) return 0; if( decoder->verify_trailer_pending ) { - if( Rd_available_bytes( decoder->range_decoder ) < Ft_versioned_size( decoder->member_version ) && - !decoder->range_decoder->at_stream_end ) + if( Rd_available_bytes( decoder->rdec ) < Ft_versioned_size( decoder->member_version ) && + !decoder->rdec->at_stream_end ) return 0; decoder->verify_trailer_pending = false; decoder->member_finished = true; if( LZd_verify_trailer( decoder ) ) return 0; else return 3; } - while( !Rd_finished( decoder->range_decoder ) ) + while( !Rd_finished( decoder->rdec ) ) { const int pos_state = LZd_data_position( decoder ) & pos_state_mask; - if( !Rd_enough_available_bytes( decoder->range_decoder ) || + if( !Rd_enough_available_bytes( decoder->rdec ) || !LZd_enough_free_bytes( decoder ) ) return 0; - if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_match[*state][pos_state] ) == 0 ) + if( Rd_decode_bit( decoder->rdec, &decoder->bm_match[*state][pos_state] ) == 0 ) /* 1st bit */ { const uint8_t prev_byte = LZd_get_prev_byte( decoder ); if( St_is_char( *state ) ) { *state -= ( *state < 4 ) ? *state : 3; - LZd_put_byte( decoder, Rd_decode_tree( decoder->range_decoder, + LZd_put_byte( decoder, Rd_decode_tree( decoder->rdec, decoder->bm_literal[get_lit_state(prev_byte)], 8 ) ); } else { *state -= ( *state < 10 ) ? 3 : 6; - LZd_put_byte( decoder, Rd_decode_matched( decoder->range_decoder, - decoder->bm_literal[get_lit_state(prev_byte)], LZd_get_byte( decoder, decoder->rep0 ) ) ); + LZd_put_byte( decoder, Rd_decode_matched( decoder->rdec, + decoder->bm_literal[get_lit_state(prev_byte)], + LZd_get_byte( decoder, decoder->rep0 ) ) ); } } else { int len; - if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_rep[*state] ) == 1 ) + if( Rd_decode_bit( decoder->rdec, &decoder->bm_rep[*state] ) == 1 ) /* 2nd bit */ { - len = 0; - if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_rep0[*state] ) == 1 ) + if( Rd_decode_bit( decoder->rdec, &decoder->bm_rep0[*state] ) == 0 ) /* 3rd bit */ + { + if( Rd_decode_bit( decoder->rdec, &decoder->bm_len[*state][pos_state] ) == 0 ) /* 4th bit */ + { *state = St_set_short_rep( *state ); + LZd_put_byte( decoder, LZd_get_byte( decoder, decoder->rep0 ) ); continue; } + } + else { unsigned distance; - if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_rep1[*state] ) == 0 ) + if( Rd_decode_bit( decoder->rdec, &decoder->bm_rep1[*state] ) == 0 ) /* 4th bit */ distance = decoder->rep1; else { - if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_rep2[*state] ) == 0 ) + if( Rd_decode_bit( decoder->rdec, &decoder->bm_rep2[*state] ) == 0 ) /* 5th bit */ distance = decoder->rep2; - else { distance = decoder->rep3; decoder->rep3 = decoder->rep2; } + else + { distance = decoder->rep3; decoder->rep3 = decoder->rep2; } decoder->rep2 = decoder->rep1; } decoder->rep1 = decoder->rep0; decoder->rep0 = distance; } - else - { - if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_len[*state][pos_state] ) == 0 ) - { *state = St_set_short_rep( *state ); len = 1; } - } - if( len == 0 ) - { - *state = St_set_rep( *state ); - len = min_match_len + Led_decode( &decoder->rep_match_len_decoder, decoder->range_decoder, pos_state ); - } + *state = St_set_rep( *state ); + len = min_match_len + Rd_decode_len( decoder->rdec, &decoder->rep_len_model, pos_state ); } else { int dis_slot; const unsigned rep0_saved = decoder->rep0; - len = min_match_len + Led_decode( &decoder->len_decoder, decoder->range_decoder, pos_state ); - dis_slot = Rd_decode_tree6( decoder->range_decoder, decoder->bm_dis_slot[get_dis_state(len)] ); + len = min_match_len + Rd_decode_len( decoder->rdec, &decoder->match_len_model, pos_state ); + dis_slot = Rd_decode_tree6( decoder->rdec, decoder->bm_dis_slot[get_dis_state(len)] ); if( dis_slot < start_dis_model ) decoder->rep0 = dis_slot; else { const int direct_bits = ( dis_slot >> 1 ) - 1; decoder->rep0 = ( 2 | ( dis_slot & 1 ) ) << direct_bits; if( dis_slot < end_dis_model ) - decoder->rep0 += Rd_decode_tree_reversed( decoder->range_decoder, + decoder->rep0 += Rd_decode_tree_reversed( decoder->rdec, decoder->bm_dis + decoder->rep0 - dis_slot - 1, direct_bits ); else { - decoder->rep0 += Rd_decode( decoder->range_decoder, direct_bits - dis_align_bits ) << dis_align_bits; - decoder->rep0 += Rd_decode_tree_reversed4( decoder->range_decoder, decoder->bm_align ); + decoder->rep0 += Rd_decode( decoder->rdec, direct_bits - dis_align_bits ) << dis_align_bits; + decoder->rep0 += Rd_decode_tree_reversed4( decoder->rdec, decoder->bm_align ); if( decoder->rep0 == 0xFFFFFFFFU ) /* Marker found */ { decoder->rep0 = rep0_saved; - Rd_normalize( decoder->range_decoder ); + Rd_normalize( decoder->rdec ); if( len == min_match_len ) /* End Of Stream marker */ { - if( Rd_available_bytes( decoder->range_decoder ) < Ft_versioned_size( decoder->member_version ) && - !decoder->range_decoder->at_stream_end ) + if( Rd_available_bytes( decoder->rdec ) < Ft_versioned_size( decoder->member_version ) && + !decoder->rdec->at_stream_end ) { decoder->verify_trailer_pending = true; return 0; } decoder->member_finished = true; if( LZd_verify_trailer( decoder ) ) return 0; else return 3; } if( len == min_match_len + 1 ) /* Sync Flush marker */ { - if( Rd_try_reload( decoder->range_decoder, true ) ) continue; + if( Rd_try_reload( decoder->rdec, true ) ) continue; else return 0; } return 4; |