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/* Lzip - LZMA lossless data compressor
Copyright (C) 2008-2015 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/>.
*/
#define _FILE_OFFSET_BITS 64
#include <algorithm>
#include <cerrno>
#include <cstdlib>
#include <cstring>
#include <string>
#include <vector>
#include <stdint.h>
#include "lzip.h"
#include "encoder_base.h"
Dis_slots dis_slots;
Prob_prices prob_prices;
bool Matchfinder_base::read_block()
{
if( !at_stream_end && stream_pos < buffer_size )
{
const int size = buffer_size - stream_pos;
const int rd = readblock( infd, buffer + stream_pos, size );
stream_pos += rd;
if( rd != size && errno ) throw Error( "Read error" );
if( rd < size ) { at_stream_end = true; pos_limit = buffer_size; }
}
return pos < stream_pos;
}
void Matchfinder_base::normalize_pos()
{
if( pos > stream_pos )
internal_error( "pos > stream_pos in Matchfinder_base::normalize_pos." );
if( !at_stream_end )
{
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 )
prev_positions[i] -= std::min( prev_positions[i], offset );
for( int i = 0; i < pos_array_size; ++i )
pos_array[i] -= std::min( pos_array[i], offset );
read_block();
}
}
Matchfinder_base::Matchfinder_base( const int before, const int dict_size,
const int after_size, const int dict_factor,
const int num_prev_positions23,
const int pos_array_factor, const int ifd )
:
partial_data_pos( 0 ),
before_size( before ),
pos( 0 ),
cyclic_pos( 0 ),
stream_pos( 0 ),
infd( ifd ),
at_stream_end( false )
{
const int buffer_size_limit =
( dict_factor * dict_size ) + before_size + after_size;
buffer_size = std::max( 65536, dict_size );
buffer = (uint8_t *)std::malloc( buffer_size );
if( !buffer ) throw std::bad_alloc();
if( read_block() && !at_stream_end && buffer_size < buffer_size_limit )
{
buffer_size = buffer_size_limit;
uint8_t * const tmp = (uint8_t *)std::realloc( buffer, buffer_size );
if( !tmp ) { std::free( buffer ); throw std::bad_alloc(); }
buffer = tmp;
read_block();
}
if( at_stream_end && stream_pos < dict_size )
dictionary_size = std::max( (int)min_dictionary_size, stream_pos );
else
dictionary_size = dict_size;
pos_limit = buffer_size;
if( !at_stream_end ) pos_limit -= after_size;
unsigned size = 1 << std::max( 16, real_bits( dictionary_size - 1 ) - 2 );
if( dictionary_size > 1 << 26 ) // 64 MiB
size >>= 1;
key4_mask = size - 1;
size += num_prev_positions23;
num_prev_positions = size;
pos_array_size = pos_array_factor * ( dictionary_size + 1 );
size += pos_array_size;
prev_positions = new( std::nothrow ) int32_t[size];
if( !prev_positions ) { std::free( buffer ); throw std::bad_alloc(); }
pos_array = prev_positions + num_prev_positions;
for( int i = 0; i < num_prev_positions; ++i ) prev_positions[i] = 0;
}
void Matchfinder_base::reset()
{
if( stream_pos > pos )
std::memmove( buffer, buffer + pos, stream_pos - pos );
partial_data_pos = 0;
stream_pos -= pos;
pos = 0;
cyclic_pos = 0;
for( int i = 0; i < num_prev_positions; ++i ) prev_positions[i] = 0;
read_block();
}
void Range_encoder::flush_data()
{
if( pos > 0 )
{
if( outfd >= 0 && writeblock( outfd, buffer, pos ) != pos )
throw Error( "Write error" );
partial_member_pos += pos;
pos = 0;
show_progress();
}
}
/* End Of Stream mark => (dis == 0xFFFFFFFFU, len == min_match_len) */
void LZ_encoder_base::full_flush( const State state )
{
const int pos_state = data_position() & pos_state_mask;
renc.encode_bit( bm_match[state()][pos_state], 1 );
renc.encode_bit( bm_rep[state()], 0 );
encode_pair( 0xFFFFFFFFU, min_match_len, pos_state );
renc.flush();
File_trailer trailer;
trailer.data_crc( crc() );
trailer.data_size( data_position() );
trailer.member_size( renc.member_position() + File_trailer::size() );
for( int i = 0; i < File_trailer::size(); ++i )
renc.put_byte( trailer.data[i] );
renc.flush_data();
}
void LZ_encoder_base::reset()
{
Matchfinder_base::reset();
crc_ = 0xFFFFFFFFU;
bm_literal[0][0].reset( ( 1 << literal_context_bits ) * 0x300 );
bm_match[0][0].reset( State::states * pos_states );
bm_rep[0].reset( State::states );
bm_rep0[0].reset( State::states );
bm_rep1[0].reset( State::states );
bm_rep2[0].reset( State::states );
bm_len[0][0].reset( State::states * pos_states );
bm_dis_slot[0][0].reset( len_states * (1 << dis_slot_bits ) );
bm_dis[0].reset( modeled_distances - end_dis_model );
bm_align[0].reset( dis_align_size );
match_len_model.reset();
rep_len_model.reset();
renc.reset();
}
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