Merging upstream version 1.4.
Signed-off-by: Daniel Baumann <daniel@debian.org>
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8563d072ca
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270d4df10d
GPG key ID:
FBB4F0E80A80222F
18 changed files with 224 additions and 197 deletions
73
decoder.c
73
decoder.c
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@ -30,15 +30,15 @@ static bool LZd_verify_trailer( struct LZ_decoder * const decoder )
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File_trailer trailer;
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const int trailer_size = Ft_versioned_size( decoder->member_version );
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const unsigned long long member_size =
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decoder->range_decoder->member_position + trailer_size;
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decoder->rdec->member_position + trailer_size;
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int size = Rd_read_data( decoder->range_decoder, trailer, trailer_size );
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int size = Rd_read_data( decoder->rdec, trailer, trailer_size );
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if( size < trailer_size )
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return false;
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if( decoder->member_version == 0 ) Ft_set_member_size( trailer, member_size );
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return ( decoder->range_decoder->code == 0 &&
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return ( decoder->rdec->code == 0 &&
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Ft_get_data_crc( trailer ) == LZd_crc( decoder ) &&
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Ft_get_data_size( trailer ) == LZd_data_position( decoder ) &&
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Ft_get_member_size( trailer ) == member_size );
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@ -51,105 +51,104 @@ static int LZd_decode_member( struct LZ_decoder * const decoder )
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{
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State * const state = &decoder->state;
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if( decoder->member_finished ) return 0;
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if( !Rd_try_reload( decoder->range_decoder, false ) ) return 0;
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if( !Rd_try_reload( decoder->rdec, false ) ) return 0;
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if( decoder->verify_trailer_pending )
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{
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if( Rd_available_bytes( decoder->range_decoder ) < Ft_versioned_size( decoder->member_version ) &&
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!decoder->range_decoder->at_stream_end )
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if( Rd_available_bytes( decoder->rdec ) < Ft_versioned_size( decoder->member_version ) &&
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!decoder->rdec->at_stream_end )
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return 0;
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decoder->verify_trailer_pending = false;
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decoder->member_finished = true;
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if( LZd_verify_trailer( decoder ) ) return 0; else return 3;
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}
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while( !Rd_finished( decoder->range_decoder ) )
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while( !Rd_finished( decoder->rdec ) )
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{
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const int pos_state = LZd_data_position( decoder ) & pos_state_mask;
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if( !Rd_enough_available_bytes( decoder->range_decoder ) ||
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if( !Rd_enough_available_bytes( decoder->rdec ) ||
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!LZd_enough_free_bytes( decoder ) )
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return 0;
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if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_match[*state][pos_state] ) == 0 )
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if( Rd_decode_bit( decoder->rdec, &decoder->bm_match[*state][pos_state] ) == 0 ) /* 1st bit */
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{
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const uint8_t prev_byte = LZd_get_prev_byte( decoder );
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if( St_is_char( *state ) )
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{
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*state -= ( *state < 4 ) ? *state : 3;
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LZd_put_byte( decoder, Rd_decode_tree( decoder->range_decoder,
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LZd_put_byte( decoder, Rd_decode_tree( decoder->rdec,
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decoder->bm_literal[get_lit_state(prev_byte)], 8 ) );
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}
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else
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{
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*state -= ( *state < 10 ) ? 3 : 6;
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LZd_put_byte( decoder, Rd_decode_matched( decoder->range_decoder,
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decoder->bm_literal[get_lit_state(prev_byte)], LZd_get_byte( decoder, decoder->rep0 ) ) );
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LZd_put_byte( decoder, Rd_decode_matched( decoder->rdec,
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decoder->bm_literal[get_lit_state(prev_byte)],
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LZd_get_byte( decoder, decoder->rep0 ) ) );
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}
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}
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else
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{
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int len;
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if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_rep[*state] ) == 1 )
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if( Rd_decode_bit( decoder->rdec, &decoder->bm_rep[*state] ) == 1 ) /* 2nd bit */
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{
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len = 0;
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if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_rep0[*state] ) == 1 )
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if( Rd_decode_bit( decoder->rdec, &decoder->bm_rep0[*state] ) == 0 ) /* 3rd bit */
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{
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if( Rd_decode_bit( decoder->rdec, &decoder->bm_len[*state][pos_state] ) == 0 ) /* 4th bit */
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{ *state = St_set_short_rep( *state );
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LZd_put_byte( decoder, LZd_get_byte( decoder, decoder->rep0 ) ); continue; }
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}
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else
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{
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unsigned distance;
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if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_rep1[*state] ) == 0 )
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if( Rd_decode_bit( decoder->rdec, &decoder->bm_rep1[*state] ) == 0 ) /* 4th bit */
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distance = decoder->rep1;
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else
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{
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if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_rep2[*state] ) == 0 )
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if( Rd_decode_bit( decoder->rdec, &decoder->bm_rep2[*state] ) == 0 ) /* 5th bit */
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distance = decoder->rep2;
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else { distance = decoder->rep3; decoder->rep3 = decoder->rep2; }
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else
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{ distance = decoder->rep3; decoder->rep3 = decoder->rep2; }
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decoder->rep2 = decoder->rep1;
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}
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decoder->rep1 = decoder->rep0;
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decoder->rep0 = distance;
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}
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else
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{
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if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_len[*state][pos_state] ) == 0 )
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{ *state = St_set_short_rep( *state ); len = 1; }
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}
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if( len == 0 )
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{
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*state = St_set_rep( *state );
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len = min_match_len + Led_decode( &decoder->rep_match_len_decoder, decoder->range_decoder, pos_state );
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}
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*state = St_set_rep( *state );
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len = min_match_len + Rd_decode_len( decoder->rdec, &decoder->rep_len_model, pos_state );
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}
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else
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{
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int dis_slot;
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const unsigned rep0_saved = decoder->rep0;
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len = min_match_len + Led_decode( &decoder->len_decoder, decoder->range_decoder, pos_state );
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dis_slot = Rd_decode_tree6( decoder->range_decoder, decoder->bm_dis_slot[get_dis_state(len)] );
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len = min_match_len + Rd_decode_len( decoder->rdec, &decoder->match_len_model, pos_state );
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dis_slot = Rd_decode_tree6( decoder->rdec, decoder->bm_dis_slot[get_dis_state(len)] );
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if( dis_slot < start_dis_model ) decoder->rep0 = dis_slot;
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else
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{
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const int direct_bits = ( dis_slot >> 1 ) - 1;
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decoder->rep0 = ( 2 | ( dis_slot & 1 ) ) << direct_bits;
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if( dis_slot < end_dis_model )
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decoder->rep0 += Rd_decode_tree_reversed( decoder->range_decoder,
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decoder->rep0 += Rd_decode_tree_reversed( decoder->rdec,
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decoder->bm_dis + decoder->rep0 - dis_slot - 1,
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direct_bits );
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else
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{
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decoder->rep0 += Rd_decode( decoder->range_decoder, direct_bits - dis_align_bits ) << dis_align_bits;
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decoder->rep0 += Rd_decode_tree_reversed4( decoder->range_decoder, decoder->bm_align );
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decoder->rep0 += Rd_decode( decoder->rdec, direct_bits - dis_align_bits ) << dis_align_bits;
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decoder->rep0 += Rd_decode_tree_reversed4( decoder->rdec, decoder->bm_align );
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if( decoder->rep0 == 0xFFFFFFFFU ) /* Marker found */
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{
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decoder->rep0 = rep0_saved;
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Rd_normalize( decoder->range_decoder );
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Rd_normalize( decoder->rdec );
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if( len == min_match_len ) /* End Of Stream marker */
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{
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if( Rd_available_bytes( decoder->range_decoder ) < Ft_versioned_size( decoder->member_version ) &&
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!decoder->range_decoder->at_stream_end )
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if( Rd_available_bytes( decoder->rdec ) < Ft_versioned_size( decoder->member_version ) &&
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!decoder->rdec->at_stream_end )
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{ decoder->verify_trailer_pending = true; return 0; }
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decoder->member_finished = true;
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if( LZd_verify_trailer( decoder ) ) return 0; else return 3;
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}
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if( len == min_match_len + 1 ) /* Sync Flush marker */
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{
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if( Rd_try_reload( decoder->range_decoder, true ) ) continue;
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if( Rd_try_reload( decoder->rdec, true ) ) continue;
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else return 0;
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}
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return 4;
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