1 files changed, 192 insertions, 0 deletions

diff --git a/encoder_base.c b/encoder_base.c
new file mode 100644
index 0000000..d666c6e
--- /dev/null
+++ b/encoder_base.c
@@ -0,0 +1,192 @@
+/*  Lzlib - Compression library for the lzip format
+    Copyright (C) 2009-2015 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 2 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.
+*/
+
+static bool Mb_normalize_pos( struct Matchfinder_base * const mb )
+  {
+  if( mb->pos > mb->stream_pos )
+    { mb->pos = mb->stream_pos; return false; }
+  if( !mb->at_stream_end )
+    {
+    int i;
+    const int offset = mb->pos - mb->dictionary_size - mb->before_size;
+    const int size = mb->stream_pos - offset;
+    memmove( mb->buffer, mb->buffer + offset, size );
+    mb->partial_data_pos += offset;
+    mb->pos -= offset;
+    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 );
+    }
+  return true;
+  }
+
+
+static bool Mb_init( struct Matchfinder_base * const mb,
+                     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 buffer_size_limit = ( dict_factor * dict_size ) + before + after_size;
+  unsigned size;
+  int i;
+
+  mb->partial_data_pos = 0;
+  mb->before_size = before;
+  mb->after_size = after_size;
+  mb->pos = 0;
+  mb->cyclic_pos = 0;
+  mb->stream_pos = 0;
+  mb->at_stream_end = false;
+  mb->flushing = false;
+
+  mb->buffer_size = max( 65536, buffer_size_limit );
+  mb->buffer = (uint8_t *)malloc( mb->buffer_size );
+  if( !mb->buffer ) return false;
+  mb->dictionary_size = dict_size;
+  mb->pos_limit = mb->buffer_size - after_size;
+  size = 1 << max( 16, real_bits( mb->dictionary_size - 1 ) - 2 );
+  if( mb->dictionary_size > 1 << 26 )		/* 64 MiB */
+    size >>= 1;
+  mb->key4_mask = size - 1;
+  mb->num_prev_positions23 = num_prev_positions23;
+  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 (int32_t) <= size ) mb->prev_positions = 0;
+  else mb->prev_positions = (int32_t *)malloc( size * sizeof (int32_t) );
+  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;
+  }
+
+
+static void Mb_adjust_distionary_size( struct Matchfinder_base * const mb )
+  {
+  if( mb->stream_pos < mb->dictionary_size )
+    {
+    int size;
+    mb->buffer_size =
+    mb->dictionary_size =
+    mb->pos_limit = max( min_dictionary_size, mb->stream_pos );
+    size = 1 << max( 16, real_bits( mb->dictionary_size - 1 ) - 2 );
+    if( mb->dictionary_size > 1 << 26 )
+      size >>= 1;
+    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;
+    }
+  }
+
+
+static void Mb_reset( struct 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->at_stream_end = false;
+  mb->flushing = false;
+  for( i = 0; i < mb->num_prev_positions; ++i ) mb->prev_positions[i] = 0;
+  }
+
+
+     /* End Of Stream mark => (dis == 0xFFFFFFFFU, len == min_match_len) */
+static bool LZeb_full_flush( struct LZ_encoder_base * const eb )
+  {
+  int i;
+  const int pos_state = Mb_data_position( &eb->mb ) & pos_state_mask;
+  const State state = eb->state;
+  File_trailer trailer;
+  if( eb->member_finished ||
+      Cb_free_bytes( &eb->renc.cb ) < max_marker_size + Ft_size )
+    return false;
+  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 );
+  Ft_set_data_crc( trailer, LZeb_crc( eb ) );
+  Ft_set_data_size( trailer, Mb_data_position( &eb->mb ) );
+  Ft_set_member_size( trailer, Re_member_position( &eb->renc ) + Ft_size );
+  for( i = 0; i < Ft_size; ++i )
+    Cb_put_byte( &eb->renc.cb, trailer[i] );
+  return true;
+  }
+
+
+     /* Sync Flush mark => (dis == 0xFFFFFFFFU, len == min_match_len + 1) */
+static bool LZeb_sync_flush( struct LZ_encoder_base * const eb )
+  {
+  int i;
+  const int pos_state = Mb_data_position( &eb->mb ) & pos_state_mask;
+  const State state = eb->state;
+  if( eb->member_finished || Cb_free_bytes( &eb->renc.cb ) < 2 * max_marker_size )
+    return false;
+  for( i = 0; i < 2; ++i )	/* 2 consecutive markers guarantee decoding */
+    {
+    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 + 1, pos_state );
+    Re_flush( &eb->renc );
+    }
+  return true;
+  }
+
+
+static void LZeb_reset( struct LZ_encoder_base * const eb,
+                        const unsigned long long member_size )
+  {
+  int i;
+  Mb_reset( &eb->mb );
+  eb->member_size_limit = member_size - Ft_size - max_marker_size;
+  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 );
+  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 );
+  for( i = 0; i < num_rep_distances; ++i ) eb->reps[i] = 0;
+  eb->state = 0;
+  eb->member_finished = false;
+  }