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/* Clzip - LZMA lossless data compressor
Copyright (C) 2010-2025 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 <errno.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "lzip.h"
#include "encoder_base.h"
Dis_slots dis_slots;
Prob_prices prob_prices;
bool Mb_read_block( Matchfinder_base * const mb )
{
if( !mb->at_stream_end && mb->stream_pos < mb->buffer_size )
{
const int size = mb->buffer_size - mb->stream_pos;
const int rd = readblock( mb->infd, mb->buffer + mb->stream_pos, size );
mb->stream_pos += rd;
if( rd != size && errno )
{ show_error( "Read error", errno, false ); cleanup_and_fail( 1 ); }
if( rd < size ) { mb->at_stream_end = true; mb->pos_limit = mb->buffer_size; }
}
return mb->pos < mb->stream_pos;
}
void Mb_normalize_pos( Matchfinder_base * const mb )
{
if( mb->pos > mb->stream_pos )
internal_error( "pos > stream_pos in Mb_normalize_pos." );
if( !mb->at_stream_end )
{
int i;
/* offset is int32_t for the min below */
const int32_t offset = mb->pos - mb->before_size - mb->dictionary_size;
const int size = mb->stream_pos - offset;
memmove( mb->buffer, mb->buffer + offset, size );
mb->partial_data_pos += offset;
mb->pos -= offset; /* pos = before_size + dictionary_size */
mb->stream_pos -= offset;
for( i = 0; i < mb->num_prev_positions; ++i )
mb->prev_positions[i] -= min( mb->prev_positions[i], offset );
for( i = 0; i < mb->pos_array_size; ++i )
mb->pos_array[i] -= min( mb->pos_array[i], offset );
Mb_read_block( mb );
}
}
bool Mb_init( Matchfinder_base * const mb, const int before_size,
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 )
{
const int buffer_size_limit =
( dict_factor * dict_size ) + before_size + after_size;
int i;
mb->partial_data_pos = 0;
mb->before_size = before_size;
mb->pos = 0;
mb->cyclic_pos = 0;
mb->stream_pos = 0;
mb->num_prev_positions23 = num_prev_positions23;
mb->infd = ifd;
mb->at_stream_end = false;
mb->buffer_size = max( 65536, dict_size );
mb->buffer = (uint8_t *)malloc( mb->buffer_size );
if( !mb->buffer ) return false;
if( Mb_read_block( mb ) && !mb->at_stream_end &&
mb->buffer_size < buffer_size_limit )
{
uint8_t * const tmp = (uint8_t *)realloc( mb->buffer, buffer_size_limit );
if( !tmp ) { free( mb->buffer ); return false; }
mb->buffer = tmp;
mb->buffer_size = buffer_size_limit;
Mb_read_block( mb );
}
if( mb->at_stream_end && mb->stream_pos < dict_size )
mb->dictionary_size = max( min_dictionary_size, mb->stream_pos );
else
mb->dictionary_size = dict_size;
mb->pos_limit = mb->buffer_size;
if( !mb->at_stream_end ) mb->pos_limit -= after_size;
unsigned size = 1 << max( 16, real_bits( mb->dictionary_size - 1 ) - 2 );
if( mb->dictionary_size > 1 << 26 ) size >>= 1; /* 64 MiB */
mb->key4_mask = size - 1; /* increases with dictionary size */
size += num_prev_positions23;
mb->num_prev_positions = size;
mb->pos_array_size = pos_array_factor * ( mb->dictionary_size + 1 );
size += mb->pos_array_size;
if( size * sizeof mb->prev_positions[0] <= size ) mb->prev_positions = 0;
else mb->prev_positions =
(int32_t *)malloc( size * sizeof mb->prev_positions[0] );
if( !mb->prev_positions ) { free( mb->buffer ); return false; }
mb->pos_array = mb->prev_positions + mb->num_prev_positions;
for( i = 0; i < mb->num_prev_positions; ++i ) mb->prev_positions[i] = 0;
return true;
}
void Mb_reset( Matchfinder_base * const mb )
{
int i;
if( mb->stream_pos > mb->pos )
memmove( mb->buffer, mb->buffer + mb->pos, mb->stream_pos - mb->pos );
mb->partial_data_pos = 0;
mb->stream_pos -= mb->pos;
mb->pos = 0;
mb->cyclic_pos = 0;
Mb_read_block( mb );
if( mb->at_stream_end && mb->stream_pos < mb->dictionary_size )
{
mb->dictionary_size = max( min_dictionary_size, mb->stream_pos );
int size = 1 << max( 16, real_bits( mb->dictionary_size - 1 ) - 2 );
if( mb->dictionary_size > 1 << 26 ) size >>= 1; /* 64 MiB */
mb->key4_mask = size - 1;
size += mb->num_prev_positions23;
mb->num_prev_positions = size;
mb->pos_array = mb->prev_positions + mb->num_prev_positions;
}
for( i = 0; i < mb->num_prev_positions; ++i ) mb->prev_positions[i] = 0;
}
void Re_flush_data( Range_encoder * const renc )
{
if( renc->pos > 0 )
{
if( renc->outfd >= 0 &&
writeblock( renc->outfd, renc->buffer, renc->pos ) != renc->pos )
{ show_error( wr_err_msg, errno, false ); cleanup_and_fail( 1 ); }
renc->partial_member_pos += renc->pos;
renc->pos = 0;
show_cprogress( 0, 0, 0, 0 );
}
}
/* End Of Stream marker => (dis == 0xFFFFFFFFU, len == min_match_len) */
void LZeb_full_flush( LZ_encoder_base * const eb, const State state )
{
const int pos_state = Mb_data_position( &eb->mb ) & pos_state_mask;
Re_encode_bit( &eb->renc, &eb->bm_match[state][pos_state], 1 );
Re_encode_bit( &eb->renc, &eb->bm_rep[state], 0 );
LZeb_encode_pair( eb, 0xFFFFFFFFU, min_match_len, pos_state );
Re_flush( &eb->renc );
Lzip_trailer trailer;
Lt_set_data_crc( trailer, LZeb_crc( eb ) );
Lt_set_data_size( trailer, Mb_data_position( &eb->mb ) );
Lt_set_member_size( trailer, Re_member_position( &eb->renc ) + Lt_size );
int i; for( i = 0; i < Lt_size; ++i ) Re_put_byte( &eb->renc, trailer[i] );
Re_flush_data( &eb->renc );
}
void LZeb_reset( LZ_encoder_base * const eb )
{
Mb_reset( &eb->mb );
eb->crc = 0xFFFFFFFFU;
Bm_array_init( eb->bm_literal[0], (1 << literal_context_bits) * 0x300 );
Bm_array_init( eb->bm_match[0], states * pos_states );
Bm_array_init( eb->bm_rep, states );
Bm_array_init( eb->bm_rep0, states );
Bm_array_init( eb->bm_rep1, states );
Bm_array_init( eb->bm_rep2, states );
Bm_array_init( eb->bm_len[0], states * pos_states );
Bm_array_init( eb->bm_dis_slot[0], len_states * (1 << dis_slot_bits) );
Bm_array_init( eb->bm_dis, modeled_distances - end_dis_model + 1 );
Bm_array_init( eb->bm_align, dis_align_size );
Lm_init( &eb->match_len_model );
Lm_init( &eb->rep_len_model );
Re_reset( &eb->renc, eb->mb.dictionary_size );
}
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