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authorDaniel Baumann <mail@daniel-baumann.ch>2015-11-07 13:45:54 +0000
committerDaniel Baumann <mail@daniel-baumann.ch>2015-11-07 13:45:54 +0000
commit53eee7f4e2ef4d4211df3e860e3c787fbd83c3e8 (patch)
treecff02b70b5a48f7cefa4a5ad4c4ab745e2b64dd6 /encoder.cc
parentAdding upstream version 1.2. (diff)
downloadlzlib-53eee7f4e2ef4d4211df3e860e3c787fbd83c3e8.tar.xz
lzlib-53eee7f4e2ef4d4211df3e860e3c787fbd83c3e8.zip
Adding upstream version 1.3.upstream/1.3
Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>
Diffstat (limited to 'encoder.cc')
-rw-r--r--encoder.cc663
1 files changed, 0 insertions, 663 deletions
diff --git a/encoder.cc b/encoder.cc
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+++ /dev/null
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-/* Lzlib - A compression library for lzip files
- Copyright (C) 2009, 2010, 2011 Antonio Diaz Diaz.
-
- This library 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 3 of the License, or
- (at your option) any later version.
-
- This library 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 library. If not, see <http://www.gnu.org/licenses/>.
-
- As a special exception, you may use this file as part of a free
- software library without restriction. Specifically, if other files
- instantiate templates or use macros or inline functions from this
- file, or you compile this file and link it with other files to
- produce an executable, this file does not by itself cause the
- resulting executable to be covered by the GNU General Public
- License. This exception does not however invalidate any other
- reasons why the executable file might be covered by the GNU General
- Public License.
-*/
-
-#define _FILE_OFFSET_BITS 64
-
-#include <algorithm>
-#include <cerrno>
-#include <cstdlib>
-#include <cstring>
-#include <stdint.h>
-
-#include "lzlib.h"
-#include "lzip.h"
-#include "encoder.h"
-
-
-namespace Lzlib {
-
-const Dis_slots dis_slots;
-const Prob_prices prob_prices;
-
-
-int Matchfinder::write_data( const uint8_t * const in_buffer, const int in_size ) throw()
- {
- if( at_stream_end_ || in_size < 0 ) return 0;
- const int size = std::min( buffer_size - stream_pos, in_size );
- if( size > 0 )
- {
- std::memcpy( buffer + stream_pos, in_buffer, size );
- stream_pos += size;
- }
- return size;
- }
-
-
-Matchfinder::Matchfinder( const int dict_size, const int len_limit )
- :
- partial_data_pos( 0 ),
- dictionary_size_( dict_size ),
- buffer_size( ( 2 * std::max( 65536, dictionary_size_ ) ) +
- before_size + after_size ),
- buffer( new( std::nothrow ) uint8_t[buffer_size] ),
- prev_positions( new( std::nothrow ) int32_t[num_prev_positions] ),
- prev_pos_tree( new( std::nothrow ) int32_t[2*dictionary_size_] ),
- pos( 0 ),
- cyclic_pos( 0 ),
- stream_pos( 0 ),
- pos_limit( buffer_size - after_size ),
- match_len_limit_( len_limit ),
- cycles( ( len_limit < max_match_len ) ? 16 + ( len_limit / 2 ) : 256 ),
- at_stream_end_( false ),
- been_flushed( false )
- {
- if( !buffer || !prev_positions || !prev_pos_tree )
- {
- if( prev_pos_tree ) delete[] prev_pos_tree;
- if( prev_positions ) delete[] prev_positions;
- if( buffer ) delete[] buffer;
- throw std::bad_alloc();
- }
- for( int i = 0; i < num_prev_positions; ++i ) prev_positions[i] = -1;
- }
-
-
-void Matchfinder::reset() throw()
- {
- const int size = stream_pos - pos;
- if( size > 0 ) std::memmove( buffer, buffer + pos, size );
- partial_data_pos = 0;
- stream_pos -= pos;
- pos = 0;
- cyclic_pos = 0;
- at_stream_end_ = false;
- been_flushed = false;
- for( int i = 0; i < num_prev_positions; ++i ) prev_positions[i] = -1;
- }
-
-
-bool Matchfinder::move_pos() throw()
- {
- if( ++cyclic_pos >= dictionary_size_ ) cyclic_pos = 0;
- if( ++pos >= pos_limit )
- {
- if( pos > stream_pos )
- { pos = stream_pos; return false; }
- else
- {
- const int offset = pos - dictionary_size_ - before_size;
- const int size = stream_pos - offset;
- std::memmove( buffer, buffer + offset, size );
- partial_data_pos += offset;
- pos -= offset;
- stream_pos -= offset;
- for( int i = 0; i < num_prev_positions; ++i )
- if( prev_positions[i] >= 0 ) prev_positions[i] -= offset;
- for( int i = 0; i < 2 * dictionary_size_; ++i )
- if( prev_pos_tree[i] >= 0 ) prev_pos_tree[i] -= offset;
- }
- }
- return true;
- }
-
-
-int Matchfinder::longest_match_len( int * const distances ) throw()
- {
- int32_t * ptr0 = prev_pos_tree + ( cyclic_pos << 1 );
- int32_t * ptr1 = ptr0 + 1;
- int len_limit = match_len_limit_;
- if( len_limit > available_bytes() )
- {
- been_flushed = true;
- len_limit = available_bytes();
- if( len_limit < 4 ) { *ptr0 = *ptr1 = -1; return 0; }
- }
-
- int maxlen = min_match_len - 1;
- const int min_pos = (pos >= dictionary_size_) ?
- (pos - dictionary_size_ + 1) : 0;
- const uint8_t * const data = buffer + pos;
- const int key2 = num_prev_positions4 + num_prev_positions3 +
- ( ( (int)data[0] << 8 ) | data[1] );
- const uint32_t tmp = crc32[data[0]] ^ data[1] ^ ( (uint32_t)data[2] << 8 );
- const int key3 = num_prev_positions4 +
- (int)( tmp & ( num_prev_positions3 - 1 ) );
- const int key4 = (int)( ( tmp ^ ( crc32[data[3]] << 5 ) ) &
- ( num_prev_positions4 - 1 ) );
-
- if( distances )
- {
- int np = prev_positions[key2];
- if( np >= min_pos )
- { distances[2] = pos - np - 1; maxlen = 2; }
- else distances[2] = 0x7FFFFFFF;
- np = prev_positions[key3];
- if( np >= min_pos && buffer[np] == data[0] )
- { distances[3] = pos - np - 1; maxlen = 3; }
- else distances[3] = 0x7FFFFFFF;
- distances[4] = 0x7FFFFFFF;
- }
-
- prev_positions[key2] = pos;
- prev_positions[key3] = pos;
- int newpos = prev_positions[key4];
- prev_positions[key4] = pos;
-
- int len = 0, len0 = 0, len1 = 0;
-
- for( int count = cycles; ; )
- {
- if( newpos < min_pos || --count < 0 ) { *ptr0 = *ptr1 = -1; break; }
- const uint8_t * const newdata = buffer + newpos;
- if( been_flushed ) len = 0;
- while( len < len_limit && newdata[len] == data[len] ) ++len;
-
- const int delta = pos - newpos;
- if( distances ) while( maxlen < len ) distances[++maxlen] = delta - 1;
-
- int32_t * const newptr = prev_pos_tree +
- ( ( cyclic_pos - delta +
- ( ( cyclic_pos >= delta ) ? 0 : dictionary_size_ ) ) << 1 );
-
- if( len < len_limit )
- {
- if( newdata[len] < data[len] )
- {
- *ptr0 = newpos;
- ptr0 = newptr + 1;
- newpos = *ptr0;
- len0 = len; if( len1 < len ) len = len1;
- }
- else
- {
- *ptr1 = newpos;
- ptr1 = newptr;
- newpos = *ptr1;
- len1 = len; if( len0 < len ) len = len0;
- }
- }
- else
- {
- *ptr0 = newptr[0];
- *ptr1 = newptr[1];
- break;
- }
- }
- if( distances )
- {
- if( distances[3] > distances[4] ) distances[3] = distances[4];
- if( distances[2] > distances[3] ) distances[2] = distances[3];
- }
- return maxlen;
- }
-
-
-void Len_encoder::encode( Range_encoder & range_encoder, int symbol,
- const int pos_state )
- {
- symbol -= min_match_len;
- if( symbol < len_low_symbols )
- {
- range_encoder.encode_bit( choice1, 0 );
- range_encoder.encode_tree( bm_low[pos_state], symbol, len_low_bits );
- }
- else
- {
- range_encoder.encode_bit( choice1, 1 );
- if( symbol < len_low_symbols + len_mid_symbols )
- {
- range_encoder.encode_bit( choice2, 0 );
- range_encoder.encode_tree( bm_mid[pos_state], symbol - len_low_symbols, len_mid_bits );
- }
- else
- {
- range_encoder.encode_bit( choice2, 1 );
- range_encoder.encode_tree( bm_high, symbol - len_low_symbols - len_mid_symbols, len_high_bits );
- }
- }
- if( --counters[pos_state] <= 0 ) update_prices( pos_state );
- }
-
-
-void LZ_encoder::fill_align_prices() throw()
- {
- for( int i = 0; i < dis_align_size; ++i )
- align_prices[i] = price_symbol_reversed( bm_align, i, dis_align_bits );
- align_price_count = dis_align_size;
- }
-
-
-void LZ_encoder::fill_distance_prices() throw()
- {
- for( int dis = start_dis_model; dis < modeled_distances; ++dis )
- {
- const int dis_slot = dis_slots.table( dis );
- const int direct_bits = ( dis_slot >> 1 ) - 1;
- const int base = ( 2 | ( dis_slot & 1 ) ) << direct_bits;
- const int price =
- price_symbol_reversed( bm_dis + base - dis_slot, dis - base, direct_bits );
- for( int dis_state = 0; dis_state < max_dis_states; ++dis_state )
- dis_prices[dis_state][dis] = price;
- }
-
- for( int dis_state = 0; dis_state < max_dis_states; ++dis_state )
- {
- int * const dsp = dis_slot_prices[dis_state];
- const Bit_model * const bmds = bm_dis_slot[dis_state];
- int slot = 0;
- for( ; slot < end_dis_model && slot < num_dis_slots; ++slot )
- dsp[slot] = price_symbol( bmds, slot, dis_slot_bits );
- for( ; slot < num_dis_slots; ++slot )
- dsp[slot] = price_symbol( bmds, slot, dis_slot_bits ) +
- (((( slot >> 1 ) - 1 ) - dis_align_bits ) << price_shift );
-
- int * const dp = dis_prices[dis_state];
- int dis = 0;
- for( ; dis < start_dis_model; ++dis )
- dp[dis] = dsp[dis];
- for( ; dis < modeled_distances; ++dis )
- dp[dis] += dsp[dis_slots.table( dis )];
- }
- }
-
-
-// Return value == number of bytes advanced (ahead).
-// trials[0]..trials[retval-1] contain the steps to encode.
-// ( trials[0].dis == -1 && trials[0].price == 1 ) means literal.
-int LZ_encoder::sequence_optimizer( const int reps[num_rep_distances],
- const State & state )
- {
- int main_len;
- if( longest_match_found > 0 ) // from previous call
- {
- main_len = longest_match_found;
- longest_match_found = 0;
- }
- else main_len = read_match_distances();
-
- int replens[num_rep_distances];
- int rep_index = 0;
- for( int i = 0; i < num_rep_distances; ++i )
- {
- replens[i] = matchfinder.true_match_len( 0, reps[i] + 1, max_match_len );
- if( replens[i] > replens[rep_index] ) rep_index = i;
- }
- if( replens[rep_index] >= matchfinder.match_len_limit() )
- {
- trials[0].dis = rep_index;
- trials[0].price = replens[rep_index];
- if( !move_pos( replens[rep_index], true ) ) return 0;
- return replens[rep_index];
- }
-
- if( main_len >= matchfinder.match_len_limit() )
- {
- trials[0].dis = match_distances[matchfinder.match_len_limit()] +
- num_rep_distances;
- trials[0].price = main_len;
- if( !move_pos( main_len, true ) ) return 0;
- return main_len;
- }
-
- {
- const int pos_state = matchfinder.data_position() & pos_state_mask;
- const uint8_t prev_byte = matchfinder[-1];
- const uint8_t cur_byte = matchfinder[0];
- const uint8_t match_byte = matchfinder[-reps[0]-1];
-
- trials[0].state = state;
- for( int i = 0; i < num_rep_distances; ++i ) trials[0].reps[i] = reps[i];
- trials[1].dis = -1;
- trials[1].prev_index = 0;
- trials[1].price = price0( bm_match[state()][pos_state] );
- if( state.is_char() )
- trials[1].price += literal_encoder.price_symbol( prev_byte, cur_byte );
- else
- trials[1].price += literal_encoder.price_matched( prev_byte, cur_byte, match_byte );
-
- const int match_price = price1( bm_match[state()][pos_state] );
- const int rep_match_price = match_price + price1( bm_rep[state()] );
-
- if( match_byte == cur_byte )
- trials[1].update( 0, 0, rep_match_price + price_rep_len1( state, pos_state ) );
-
- if( main_len < min_match_len )
- {
- trials[0].dis = trials[1].dis;
- trials[0].price = 1;
- if( !matchfinder.move_pos() ) return 0;
- return 1;
- }
-
- if( main_len <= replens[rep_index] )
- {
- main_len = replens[rep_index];
- for( int len = min_match_len; len <= main_len; ++len )
- trials[len].price = infinite_price;
- }
- else
- {
- const int normal_match_price = match_price + price0( bm_rep[state()] );
- for( int len = min_match_len; len <= main_len; ++len )
- {
- trials[len].dis = match_distances[len] + num_rep_distances;
- trials[len].prev_index = 0;
- trials[len].price = normal_match_price +
- price_pair( match_distances[len], len, pos_state );
- }
- }
-
- for( int rep = 0; rep < num_rep_distances; ++rep )
- {
- const int price = rep_match_price +
- price_rep( rep, state, pos_state );
- for( int len = min_match_len; len <= replens[rep]; ++len )
- trials[len].update( rep, 0, price +
- rep_match_len_encoder.price( len, pos_state ) );
- }
- }
-
- int cur = 0;
- int num_trials = main_len;
- if( !matchfinder.move_pos() ) return 0;
-
- while( true )
- {
- if( ++cur >= num_trials ) // no more initialized trials
- {
- backward( cur );
- return cur;
- }
- const int newlen = read_match_distances();
- if( newlen >= matchfinder.match_len_limit() )
- {
- longest_match_found = newlen;
- backward( cur );
- return cur;
- }
-
- Trial & cur_trial = trials[cur];
- const int prev_index = cur_trial.prev_index;
-
- cur_trial.state = trials[prev_index].state;
-
- for( int i = 0; i < num_rep_distances; ++i )
- cur_trial.reps[i] = trials[prev_index].reps[i];
- if( prev_index == cur - 1 )
- {
- if( cur_trial.dis == 0 ) cur_trial.state.set_short_rep();
- else cur_trial.state.set_char();
- }
- else
- {
- if( cur_trial.dis < num_rep_distances ) cur_trial.state.set_rep();
- else cur_trial.state.set_match();
- mtf_reps( cur_trial.dis, cur_trial.reps );
- }
-
- const int pos_state = matchfinder.data_position() & pos_state_mask;
- const uint8_t prev_byte = matchfinder[-1];
- const uint8_t cur_byte = matchfinder[0];
- const uint8_t match_byte = matchfinder[-cur_trial.reps[0]-1];
-
- int next_price = cur_trial.price +
- price0( bm_match[cur_trial.state()][pos_state] );
- if( cur_trial.state.is_char() )
- next_price += literal_encoder.price_symbol( prev_byte, cur_byte );
- else
- next_price += literal_encoder.price_matched( prev_byte, cur_byte, match_byte );
- if( !matchfinder.move_pos() ) return 0;
-
- Trial & next_trial = trials[cur+1];
-
- next_trial.update( -1, cur, next_price );
-
- const int match_price = cur_trial.price + price1( bm_match[cur_trial.state()][pos_state] );
- const int rep_match_price = match_price + price1( bm_rep[cur_trial.state()] );
-
- if( match_byte == cur_byte && next_trial.dis != 0 )
- next_trial.update( 0, cur, rep_match_price +
- price_rep_len1( cur_trial.state, pos_state ) );
-
- const int len_limit = std::min( std::min( max_num_trials - 1 - cur,
- matchfinder.available_bytes() ), matchfinder.match_len_limit() );
- if( len_limit < min_match_len ) continue;
-
- for( int rep = 0; rep < num_rep_distances; ++rep )
- {
- const int dis = cur_trial.reps[rep] + 1;
- int len = 0;
- const uint8_t * const data = matchfinder.ptr_to_current_pos() - 1;
- while( len < len_limit && data[len] == data[len-dis] ) ++len;
- if( len >= min_match_len )
- {
- const int price = rep_match_price +
- price_rep( rep, cur_trial.state, pos_state );
- while( num_trials < cur + len )
- trials[++num_trials].price = infinite_price;
- for( ; len >= min_match_len; --len )
- trials[cur+len].update( rep, cur, price +
- rep_match_len_encoder.price( len, pos_state ) );
- }
- }
-
- if( newlen <= len_limit &&
- ( newlen > min_match_len ||
- ( newlen == min_match_len &&
- match_distances[min_match_len] < modeled_distances ) ) )
- {
- const int normal_match_price = match_price +
- price0( bm_rep[cur_trial.state()] );
- while( num_trials < cur + newlen )
- trials[++num_trials].price = infinite_price;
-
- int dis = match_distances[min_match_len];
- int dis_state = get_dis_state( min_match_len );
- int dis_price = infinite_price;
- if( dis < modeled_distances )
- trials[cur+min_match_len].update( dis + num_rep_distances, cur,
- normal_match_price + dis_prices[dis_state][dis] +
- len_encoder.price( min_match_len, pos_state ) );
- for( int len = min_match_len + 1; len <= newlen; ++len )
- {
- if( dis != match_distances[len] || dis_state < max_dis_states - 1 )
- {
- dis = match_distances[len];
- dis_state = get_dis_state( len );
- dis_price = price_dis( dis, dis_state );
- }
- trials[cur+len].update( dis + num_rep_distances, cur,
- normal_match_price + dis_price +
- len_encoder.price( len, pos_state ) );
- }
- }
- }
- }
-
-
- // End Of Stream mark => (dis == 0xFFFFFFFFU, len == min_match_len)
-bool LZ_encoder::full_flush( const State & state )
- {
- if( member_finished_ ||
- range_encoder.free_bytes() < File_trailer::size() + max_marker_size )
- return false;
- const int pos_state = matchfinder.data_position() & pos_state_mask;
- range_encoder.encode_bit( bm_match[state()][pos_state], 1 );
- range_encoder.encode_bit( bm_rep[state()], 0 );
- encode_pair( 0xFFFFFFFFU, min_match_len, pos_state );
- range_encoder.flush();
- File_trailer trailer;
- trailer.data_crc( crc() );
- trailer.data_size( matchfinder.data_position() );
- trailer.member_size( range_encoder.member_position() + File_trailer::size() );
- for( int i = 0; i < File_trailer::size(); ++i )
- range_encoder.put_byte( trailer.data[i] );
- return true;
- }
-
-
- // Sync Flush mark => (dis == 0xFFFFFFFFU, len == min_match_len + 1)
-bool LZ_encoder::sync_flush()
- {
- if( member_finished_ || range_encoder.free_bytes() < max_marker_size )
- return false;
- const State & state = main_state;
- const int pos_state = matchfinder.data_position() & pos_state_mask;
- range_encoder.encode_bit( bm_match[state()][pos_state], 1 );
- range_encoder.encode_bit( bm_rep[state()], 0 );
- encode_pair( 0xFFFFFFFFU, min_match_len + 1, pos_state );
- range_encoder.flush();
- return true;
- }
-
-
-LZ_encoder::LZ_encoder( Matchfinder & mf, const File_header & header,
- const long long member_size )
- :
- member_size_limit( member_size - File_trailer::size() - max_marker_size ),
- longest_match_found( 0 ),
- crc_( 0xFFFFFFFFU ),
- matchfinder( mf ),
- len_encoder( matchfinder.match_len_limit() ),
- rep_match_len_encoder( matchfinder.match_len_limit() ),
- num_dis_slots( 2 * real_bits( matchfinder.dictionary_size() - 1 ) ),
- fill_counter( 0 ),
- member_finished_( false )
- {
- for( int i = 0; i < num_rep_distances; ++i ) rep_distances[i] = 0;
- fill_align_prices();
-
- for( int i = 0; i < File_header::size; ++i )
- range_encoder.put_byte( header.data[i] );
- }
-
-
-bool LZ_encoder::encode_member( const bool finish )
- {
- const int fill_count = ( matchfinder.match_len_limit() > 12 ) ? 512 : 2048;
- State & state = main_state;
- if( member_finished_ ) return true;
- if( range_encoder.member_position() >= member_size_limit )
- { if( full_flush( state ) ) { member_finished_ = true; } return true; }
-
- // encode first byte
- if( matchfinder.data_position() == 0 && !matchfinder.finished() )
- {
- if( matchfinder.available_bytes() < 4 && !matchfinder.at_stream_end() )
- return true;
- const uint8_t prev_byte = 0;
- const uint8_t cur_byte = matchfinder[0];
- range_encoder.encode_bit( bm_match[state()][0], 0 );
- literal_encoder.encode( range_encoder, prev_byte, cur_byte );
- crc32.update( crc_, cur_byte );
- if( !move_pos( 1 ) ) return false;
- }
-
- while( true )
- {
- if( matchfinder.finished() )
- {
- if( finish && full_flush( state ) ) member_finished_ = true;
- return true;
- }
- if( !matchfinder.enough_available_bytes() ||
- !range_encoder.enough_free_bytes() ) return true;
- if( fill_counter <= 0 )
- { fill_distance_prices(); fill_counter = fill_count; }
-
- int ahead = sequence_optimizer( rep_distances, state );
- if( ahead <= 0 ) return false;
- fill_counter -= ahead;
-
- for( int i = 0; ; )
- {
- const int pos_state =
- ( matchfinder.data_position() - ahead ) & pos_state_mask;
- const int dis = trials[i].dis;
- const int len = trials[i].price;
-
- bool bit = ( dis < 0 && len == 1 );
- range_encoder.encode_bit( bm_match[state()][pos_state], !bit );
- if( bit ) // literal byte
- {
- const uint8_t prev_byte = matchfinder[-ahead-1];
- const uint8_t cur_byte = matchfinder[-ahead];
- crc32.update( crc_, cur_byte );
- if( state.is_char() )
- literal_encoder.encode( range_encoder, prev_byte, cur_byte );
- else
- {
- const uint8_t match_byte = matchfinder[-ahead-rep_distances[0]-1];
- literal_encoder.encode_matched( range_encoder,
- prev_byte, cur_byte, match_byte );
- }
- state.set_char();
- }
- else // match or repeated match
- {
- crc32.update( crc_, matchfinder.ptr_to_current_pos() - ahead, len );
- mtf_reps( dis, rep_distances );
- bit = ( dis < num_rep_distances );
- range_encoder.encode_bit( bm_rep[state()], bit );
- if( bit )
- {
- bit = ( dis == 0 );
- range_encoder.encode_bit( bm_rep0[state()], !bit );
- if( bit )
- range_encoder.encode_bit( bm_len[state()][pos_state], len > 1 );
- else
- {
- range_encoder.encode_bit( bm_rep1[state()], dis > 1 );
- if( dis > 1 )
- range_encoder.encode_bit( bm_rep2[state()], dis > 2 );
- }
- if( len == 1 ) state.set_short_rep();
- else
- {
- rep_match_len_encoder.encode( range_encoder, len, pos_state );
- state.set_rep();
- }
- }
- else
- {
- encode_pair( dis - num_rep_distances, len, pos_state );
- state.set_match();
- }
- }
- ahead -= len; i += len;
- if( range_encoder.member_position() >= member_size_limit )
- {
- if( !matchfinder.dec_pos( ahead ) ) return false;
- if( full_flush( state ) ) member_finished_ = true;
- return true;
- }
- if( ahead <= 0 ) break;
- }
- }
- }
-
-} // end namespace Lzlib