Adding upstream version 1.6~pre2.upstream/1.6_pre2

Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>

1 files changed, 286 insertions, 319 deletions

diff --git a/encoder.c b/encoder.c
index 84cf760..3a22a25 100644
--- a/encoder.c
+++ b/encoder.c
@@ -1,5 +1,5 @@
 /*  Lzlib - Compression library for lzip files
-    Copyright (C) 2009, 2010, 2011, 2012, 2013 Antonio Diaz Diaz.
+    Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 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
@@ -39,16 +39,16 @@ static bool Mf_normalize_pos( struct Matchfinder * const mf )
     mf->pos -= offset;
     mf->stream_pos -= offset;
     for( i = 0; i < mf->num_prev_positions; ++i )
-      if( mf->prev_positions[i] >= 0 ) mf->prev_positions[i] -= offset;
+      mf->prev_positions[i] -= min( mf->prev_positions[i], offset );
     for( i = 0; i < 2 * ( mf->dictionary_size + 1 ); ++i )
-      if( mf->prev_pos_tree[i] >= 0 ) mf->prev_pos_tree[i] -= offset;
+      mf->prev_pos_tree[i] -= min( mf->prev_pos_tree[i], offset );
     }
   return true;
   }
 
 
-static bool Mf_init( struct Matchfinder * const mf,
-                     const int dict_size, const int match_len_limit )
+static bool Mf_init( struct Matchfinder * const mf, const int dict_size,
+                     const int match_len_limit )
   {
   const int buffer_size_limit = ( 2 * dict_size ) + before_size + after_size;
   unsigned size;
@@ -83,7 +83,7 @@ static bool Mf_init( struct Matchfinder * const mf,
   else mf->prev_positions = (int32_t *)malloc( size * sizeof (int32_t) );
   if( !mf->prev_positions ) { free( mf->buffer ); return false; }
   mf->prev_pos_tree = mf->prev_positions + mf->num_prev_positions;
-  for( i = 0; i < mf->num_prev_positions; ++i ) mf->prev_positions[i] = -1;
+  for( i = 0; i < mf->num_prev_positions; ++i ) mf->prev_positions[i] = 0;
   return true;
   }
 
@@ -111,8 +111,8 @@ static void Mf_adjust_distionary_size( struct Matchfinder * const mf )
 static void Mf_reset( struct Matchfinder * const mf )
   {
   int i;
-  const int size = mf->stream_pos - mf->pos;
-  if( size > 0 ) memmove( mf->buffer, mf->buffer + mf->pos, size );
+  if( mf->stream_pos > mf->pos )
+    memmove( mf->buffer, mf->buffer + mf->pos, mf->stream_pos - mf->pos );
   mf->partial_data_pos = 0;
   mf->stream_pos -= mf->pos;
   mf->pos = 0;
@@ -120,7 +120,7 @@ static void Mf_reset( struct Matchfinder * const mf )
   mf->at_stream_end = false;
   mf->been_flushed = false;
   mf->flushing = false;
-  for( i = 0; i < mf->num_prev_positions; ++i ) mf->prev_positions[i] = -1;
+  for( i = 0; i < mf->num_prev_positions; ++i ) mf->prev_positions[i] = 0;
   }
 
 
@@ -130,10 +130,11 @@ static int Mf_get_match_pairs( struct Matchfinder * const mf, struct Pair * pair
   int32_t * ptr1 = ptr0 + 1;
   int32_t * newptr;
   int len = 0, len0 = 0, len1 = 0;
-  int maxlen = min_match_len - 1;
+  int maxlen = 0;
   int num_pairs = 0;
-  const int min_pos = (mf->pos > mf->dictionary_size) ?
-                       mf->pos - mf->dictionary_size : 0;
+  const int pos1 = mf->pos + 1;
+  const int min_pos =
+    ( mf->pos > mf->dictionary_size ) ? mf->pos - mf->dictionary_size : 0;
   const uint8_t * const data = mf->buffer + mf->pos;
   int count, delta, key2, key3, key4, newpos;
   unsigned tmp;
@@ -143,12 +144,12 @@ static int Mf_get_match_pairs( struct Matchfinder * const mf, struct Pair * pair
     {
     mf->been_flushed = true;
     len_limit = Mf_available_bytes( mf );
-    if( len_limit < 4 ) { *ptr0 = *ptr1 = -1; return 0; }
+    if( len_limit < 4 ) { *ptr0 = *ptr1 = 0; return 0; }
     }
 
   tmp = crc32[data[0]] ^ data[1];
   key2 = tmp & ( num_prev_positions2 - 1 );
-  tmp ^= (uint32_t)data[2] << 8;
+  tmp ^= (unsigned)data[2] << 8;
   key3 = num_prev_positions2 + ( tmp & ( num_prev_positions3 - 1 ) );
   key4 = num_prev_positions2 + num_prev_positions3 +
          ( ( tmp ^ ( crc32[data[3]] << 5 ) ) & mf->key4_mask );
@@ -157,41 +158,41 @@ static int Mf_get_match_pairs( struct Matchfinder * const mf, struct Pair * pair
     {
     int np2 = mf->prev_positions[key2];
     int np3 = mf->prev_positions[key3];
-    if( np2 >= min_pos && mf->buffer[np2] == data[0] )
+    if( np2 > min_pos && mf->buffer[np2-1] == data[0] )
       {
-      pairs[0].dis = mf->pos - np2 - 1;
+      pairs[0].dis = mf->pos - np2;
       pairs[0].len = maxlen = 2;
       num_pairs = 1;
       }
-    if( np2 != np3 && np3 >= min_pos && mf->buffer[np3] == data[0] )
+    if( np2 != np3 && np3 > min_pos && mf->buffer[np3-1] == data[0] )
       {
       maxlen = 3;
-      pairs[num_pairs].dis = mf->pos - np3 - 1;
-      ++num_pairs;
       np2 = np3;
+      pairs[num_pairs].dis = mf->pos - np2;
+      ++num_pairs;
       }
     if( num_pairs > 0 )
       {
-      delta = mf->pos - np2;
+      delta = pos1 - np2;
       while( maxlen < len_limit && data[maxlen-delta] == data[maxlen] )
         ++maxlen;
       pairs[num_pairs-1].len = maxlen;
-      if( maxlen >= len_limit ) pairs = 0;
+      if( maxlen >= len_limit ) pairs = 0;	/* done. now just skip */
       }
     if( maxlen < 3 ) maxlen = 3;
     }
 
-  mf->prev_positions[key2] = mf->pos;
-  mf->prev_positions[key3] = mf->pos;
+  mf->prev_positions[key2] = pos1;
+  mf->prev_positions[key3] = pos1;
   newpos = mf->prev_positions[key4];
-  mf->prev_positions[key4] = mf->pos;
+  mf->prev_positions[key4] = pos1;
 
   for( count = mf->cycles; ; )
     {
-    if( newpos < min_pos || --count < 0 ) { *ptr0 = *ptr1 = -1; break; }
+    if( newpos <= min_pos || --count < 0 ) { *ptr0 = *ptr1 = 0; break; }
 
     if( mf->been_flushed ) len = 0;
-    delta = mf->pos - newpos;
+    delta = pos1 - newpos;
     newptr = mf->prev_pos_tree +
       ( ( mf->cyclic_pos - delta +
           ( (mf->cyclic_pos >= delta) ? 0 : mf->dictionary_size + 1 ) ) << 1 );
@@ -230,86 +231,83 @@ static int Mf_get_match_pairs( struct Matchfinder * const mf, struct Pair * pair
   }
 
 
-static void Lee_encode( struct Len_encoder * const len_encoder,
+static void Lee_encode( struct Len_encoder * const le,
                         struct Range_encoder * const renc,
                         int symbol, const int pos_state )
   {
   symbol -= min_match_len;
   if( symbol < len_low_symbols )
     {
-    Re_encode_bit( renc, &len_encoder->lm.choice1, 0 );
-    Re_encode_tree( renc, len_encoder->lm.bm_low[pos_state], symbol, len_low_bits );
+    Re_encode_bit( renc, &le->lm.choice1, 0 );
+    Re_encode_tree( renc, le->lm.bm_low[pos_state], symbol, len_low_bits );
     }
   else
     {
-    Re_encode_bit( renc, &len_encoder->lm.choice1, 1 );
+    Re_encode_bit( renc, &le->lm.choice1, 1 );
     if( symbol < len_low_symbols + len_mid_symbols )
       {
-      Re_encode_bit( renc, &len_encoder->lm.choice2, 0 );
-      Re_encode_tree( renc, len_encoder->lm.bm_mid[pos_state],
+      Re_encode_bit( renc, &le->lm.choice2, 0 );
+      Re_encode_tree( renc, le->lm.bm_mid[pos_state],
                       symbol - len_low_symbols, len_mid_bits );
       }
     else
       {
-      Re_encode_bit( renc, &len_encoder->lm.choice2, 1 );
-      Re_encode_tree( renc, len_encoder->lm.bm_high,
+      Re_encode_bit( renc, &le->lm.choice2, 1 );
+      Re_encode_tree( renc, le->lm.bm_high,
                       symbol - len_low_symbols - len_mid_symbols, len_high_bits );
       }
     }
-  if( --len_encoder->counters[pos_state] <= 0 )
-    Lee_update_prices( len_encoder, pos_state );
+  if( --le->counters[pos_state] <= 0 ) Lee_update_prices( le, pos_state );
   }
 
 
      /* End Of Stream mark => (dis == 0xFFFFFFFFU, len == min_match_len) */
-static bool LZe_full_flush( struct LZ_encoder * const encoder, const State state )
+static bool LZe_full_flush( struct LZ_encoder * const e, const State state )
   {
   int i;
-  const int pos_state = Mf_data_position( encoder->matchfinder ) & pos_state_mask;
+  const int pos_state = Mf_data_position( e->matchfinder ) & pos_state_mask;
   File_trailer trailer;
-  if( encoder->member_finished ||
-      Cb_free_bytes( &encoder->renc.cb ) < max_marker_size + Ft_size )
+  if( e->member_finished ||
+      Cb_free_bytes( &e->renc.cb ) < max_marker_size + Ft_size )
     return false;
-  Re_encode_bit( &encoder->renc, &encoder->bm_match[state][pos_state], 1 );
-  Re_encode_bit( &encoder->renc, &encoder->bm_rep[state], 0 );
-  LZe_encode_pair( encoder, 0xFFFFFFFFU, min_match_len, pos_state );
-  Re_flush( &encoder->renc );
-  Ft_set_data_crc( trailer, LZe_crc( encoder ) );
-  Ft_set_data_size( trailer, Mf_data_position( encoder->matchfinder ) );
-  Ft_set_member_size( trailer, Re_member_position( &encoder->renc ) + Ft_size );
+  Re_encode_bit( &e->renc, &e->bm_match[state][pos_state], 1 );
+  Re_encode_bit( &e->renc, &e->bm_rep[state], 0 );
+  LZe_encode_pair( e, 0xFFFFFFFFU, min_match_len, pos_state );
+  Re_flush( &e->renc );
+  Ft_set_data_crc( trailer, LZe_crc( e ) );
+  Ft_set_data_size( trailer, Mf_data_position( e->matchfinder ) );
+  Ft_set_member_size( trailer, Re_member_position( &e->renc ) + Ft_size );
   for( i = 0; i < Ft_size; ++i )
-    Cb_put_byte( &encoder->renc.cb, trailer[i] );
+    Cb_put_byte( &e->renc.cb, trailer[i] );
   return true;
   }
 
 
      /* Sync Flush mark => (dis == 0xFFFFFFFFU, len == min_match_len + 1) */
-static bool LZe_sync_flush( struct LZ_encoder * const encoder )
+static bool LZe_sync_flush( struct LZ_encoder * const e )
   {
-  const int pos_state = Mf_data_position( encoder->matchfinder ) & pos_state_mask;
-  const State state = encoder->state;
-  if( encoder->member_finished ||
-      Cb_free_bytes( &encoder->renc.cb ) < max_marker_size )
+  const int pos_state = Mf_data_position( e->matchfinder ) & pos_state_mask;
+  const State state = e->state;
+  if( e->member_finished || Cb_free_bytes( &e->renc.cb ) < max_marker_size )
     return false;
-  Re_encode_bit( &encoder->renc, &encoder->bm_match[state][pos_state], 1 );
-  Re_encode_bit( &encoder->renc, &encoder->bm_rep[state], 0 );
-  LZe_encode_pair( encoder, 0xFFFFFFFFU, min_match_len + 1, pos_state );
-  Re_flush( &encoder->renc );
+  Re_encode_bit( &e->renc, &e->bm_match[state][pos_state], 1 );
+  Re_encode_bit( &e->renc, &e->bm_rep[state], 0 );
+  LZe_encode_pair( e, 0xFFFFFFFFU, min_match_len + 1, pos_state );
+  Re_flush( &e->renc );
   return true;
   }
 
 
-static void LZe_fill_align_prices( struct LZ_encoder * const encoder )
+static void LZe_fill_align_prices( struct LZ_encoder * const e )
   {
   int i;
   for( i = 0; i < dis_align_size; ++i )
-    encoder->align_prices[i] =
-      price_symbol_reversed( encoder->bm_align, i, dis_align_bits );
-  encoder->align_price_count = dis_align_size;
+    e->align_prices[i] = price_symbol_reversed( e->bm_align, i, dis_align_bits );
+  e->align_price_count = dis_align_size;
   }
 
 
-static void LZe_fill_distance_prices( struct LZ_encoder * const encoder )
+static void LZe_fill_distance_prices( struct LZ_encoder * const e )
   {
   int dis, len_state;
   for( dis = start_dis_model; dis < modeled_distances; ++dis )
@@ -317,22 +315,21 @@ static void LZe_fill_distance_prices( struct LZ_encoder * const encoder )
     const int dis_slot = dis_slots[dis];
     const int direct_bits = ( dis_slot >> 1 ) - 1;
     const int base = ( 2 | ( dis_slot & 1 ) ) << direct_bits;
-    const int price =
-      price_symbol_reversed( encoder->bm_dis + base - dis_slot - 1,
-                             dis - base, direct_bits );
+    const int price = price_symbol_reversed( e->bm_dis + base - dis_slot - 1,
+                                             dis - base, direct_bits );
     for( len_state = 0; len_state < len_states; ++len_state )
-      encoder->dis_prices[len_state][dis] = price;
+      e->dis_prices[len_state][dis] = price;
     }
 
   for( len_state = 0; len_state < len_states; ++len_state )
     {
-    int * const dsp = encoder->dis_slot_prices[len_state];
-    int * const dp = encoder->dis_prices[len_state];
-    const Bit_model * const bmds = encoder->bm_dis_slot[len_state];
+    int * const dsp = e->dis_slot_prices[len_state];
+    int * const dp = e->dis_prices[len_state];
+    const Bit_model * const bmds = e->bm_dis_slot[len_state];
     int slot = 0;
-    for( ; slot < end_dis_model && slot < encoder->num_dis_slots; ++slot )
+    for( ; slot < end_dis_model; ++slot )
       dsp[slot] = price_symbol( bmds, slot, dis_slot_bits );
-    for( ; slot < encoder->num_dis_slots; ++slot )
+    for( ; slot < e->num_dis_slots; ++slot )
       dsp[slot] = price_symbol( bmds, slot, dis_slot_bits ) +
                   (((( slot >> 1 ) - 1 ) - dis_align_bits ) << price_shift_bits );
 
@@ -344,51 +341,49 @@ static void LZe_fill_distance_prices( struct LZ_encoder * const encoder )
   }
 
 
-static bool LZe_init( struct LZ_encoder * const encoder,
+static bool LZe_init( struct LZ_encoder * const e,
                       struct Matchfinder * const mf,
                       const File_header header,
                       const unsigned long long member_size )
   {
   int i;
-  encoder->member_size_limit = member_size - Ft_size - max_marker_size;
-  encoder->pending_num_pairs = 0;
-  encoder->crc = 0xFFFFFFFFU;
-
-  Bm_array_init( encoder->bm_literal[0], (1 << literal_context_bits) * 0x300 );
-  Bm_array_init( encoder->bm_match[0], states * pos_states );
-  Bm_array_init( encoder->bm_rep, states );
-  Bm_array_init( encoder->bm_rep0, states );
-  Bm_array_init( encoder->bm_rep1, states );
-  Bm_array_init( encoder->bm_rep2, states );
-  Bm_array_init( encoder->bm_len[0], states * pos_states );
-  Bm_array_init( encoder->bm_dis_slot[0], len_states * (1 << dis_slot_bits) );
-  Bm_array_init( encoder->bm_dis, modeled_distances - end_dis_model );
-  Bm_array_init( encoder->bm_align, dis_align_size );
-
-  encoder->matchfinder = mf;
-  if( !Re_init( &encoder->renc ) ) return false;
-  Lee_init( &encoder->match_len_encoder, encoder->matchfinder->match_len_limit );
-  Lee_init( &encoder->rep_len_encoder, encoder->matchfinder->match_len_limit );
-  encoder->num_dis_slots =
-    2 * real_bits( encoder->matchfinder->dictionary_size - 1 );
-
-  for( i = 0; i < num_rep_distances; ++i ) encoder->rep_distances[i] = 0;
-  encoder->align_price_count = 0;
-  encoder->fill_counter = 0;
-  encoder->state = 0;
-  encoder->member_finished = false;
+  e->member_size_limit = member_size - Ft_size - max_marker_size;
+  e->pending_num_pairs = 0;
+  e->crc = 0xFFFFFFFFU;
+
+  Bm_array_init( e->bm_literal[0], (1 << literal_context_bits) * 0x300 );
+  Bm_array_init( e->bm_match[0], states * pos_states );
+  Bm_array_init( e->bm_rep, states );
+  Bm_array_init( e->bm_rep0, states );
+  Bm_array_init( e->bm_rep1, states );
+  Bm_array_init( e->bm_rep2, states );
+  Bm_array_init( e->bm_len[0], states * pos_states );
+  Bm_array_init( e->bm_dis_slot[0], len_states * (1 << dis_slot_bits) );
+  Bm_array_init( e->bm_dis, modeled_distances - end_dis_model );
+  Bm_array_init( e->bm_align, dis_align_size );
+
+  e->matchfinder = mf;
+  if( !Re_init( &e->renc ) ) return false;
+  Lee_init( &e->match_len_encoder, mf->match_len_limit );
+  Lee_init( &e->rep_len_encoder, mf->match_len_limit );
+  for( i = 0; i < num_rep_distances; ++i ) e->reps[i] = 0;
+  e->align_price_count = 0;
+  e->num_dis_slots = 2 * real_bits( mf->dictionary_size - 1 );
+  e->fill_counter = 0;
+  e->state = 0;
+  e->member_finished = false;
 
   for( i = 0; i < Fh_size; ++i )
-    Cb_put_byte( &encoder->renc.cb, header[i] );
+    Cb_put_byte( &e->renc.cb, header[i] );
   return true;
   }
 
 
 /* Return value == number of bytes advanced (ahead).
    trials[0]..trials[ahead-1] contain the steps to encode.
-   ( trials[0].dis == -1 && trials[0].price == 1 ) means literal.
+   ( trials[0].dis == -1 ) means literal.
 */
-static int LZe_sequence_optimizer( struct LZ_encoder * const encoder,
+static int LZe_sequence_optimizer( struct LZ_encoder * const e,
                                    const int reps[num_rep_distances],
                                    const State state )
   {
@@ -396,111 +391,108 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const encoder,
   int replens[num_rep_distances];
   int rep_index = 0;
 
-  if( encoder->pending_num_pairs > 0 )		/* from previous call */
+  if( e->pending_num_pairs > 0 )		/* from previous call */
     {
-    num_pairs = encoder->pending_num_pairs;
-    encoder->pending_num_pairs = 0;
+    num_pairs = e->pending_num_pairs;
+    e->pending_num_pairs = 0;
     }
   else
-    num_pairs = LZe_read_match_distances( encoder );
-  main_len = ( num_pairs > 0 ) ? encoder->pairs[num_pairs-1].len : 0;
+    num_pairs = LZe_read_match_distances( e );
+  main_len = ( num_pairs > 0 ) ? e->pairs[num_pairs-1].len : 0;
 
   for( i = 0; i < num_rep_distances; ++i )
     {
     replens[i] =
-      Mf_true_match_len( encoder->matchfinder, 0, reps[i] + 1, max_match_len );
+      Mf_true_match_len( e->matchfinder, 0, reps[i] + 1, max_match_len );
     if( replens[i] > replens[rep_index] ) rep_index = i;
     }
-  if( replens[rep_index] >= encoder->matchfinder->match_len_limit )
+  if( replens[rep_index] >= e->matchfinder->match_len_limit )
     {
-    encoder->trials[0].dis = rep_index;
-    encoder->trials[0].price = replens[rep_index];
-    if( !LZe_move_pos( encoder, replens[rep_index] ) ) return 0;
+    e->trials[0].dis = rep_index;
+    e->trials[0].price = replens[rep_index];
+    if( !LZe_move_pos( e, replens[rep_index] ) ) return 0;
     return replens[rep_index];
     }
 
-  if( main_len >= encoder->matchfinder->match_len_limit )
+  if( main_len >= e->matchfinder->match_len_limit )
     {
-    encoder->trials[0].dis = encoder->pairs[num_pairs-1].dis + num_rep_distances;
-    encoder->trials[0].price = main_len;
-    if( !LZe_move_pos( encoder, main_len ) ) return 0;
+    e->trials[0].dis = e->pairs[num_pairs-1].dis + num_rep_distances;
+    e->trials[0].price = main_len;
+    if( !LZe_move_pos( e, main_len ) ) return 0;
     return main_len;
     }
 
   {
-  const int pos_state = Mf_data_position( encoder->matchfinder ) & pos_state_mask;
-  const int match_price = price1( encoder->bm_match[state][pos_state] );
-  const int rep_match_price = match_price + price1( encoder->bm_rep[state] );
-  const uint8_t prev_byte = Mf_peek( encoder->matchfinder, -1 );
-  const uint8_t cur_byte = Mf_peek( encoder->matchfinder, 0 );
-  const uint8_t match_byte = Mf_peek( encoder->matchfinder, -reps[0]-1 );
-
-  encoder->trials[0].state = state;
-  encoder->trials[1].dis = -1;
-  encoder->trials[1].price = price0( encoder->bm_match[state][pos_state] );
+  const int pos_state = Mf_data_position( e->matchfinder ) & pos_state_mask;
+  const int match_price = price1( e->bm_match[state][pos_state] );
+  const int rep_match_price = match_price + price1( e->bm_rep[state] );
+  const uint8_t prev_byte = Mf_peek( e->matchfinder, 1 );
+  const uint8_t cur_byte = Mf_peek( e->matchfinder, 0 );
+  const uint8_t match_byte = Mf_peek( e->matchfinder, reps[0] + 1 );
+
+  e->trials[0].state = state;
+  e->trials[1].dis = -1;				/* literal */
+  e->trials[1].price = price0( e->bm_match[state][pos_state] );
   if( St_is_char( state ) )
-    encoder->trials[1].price +=
-      LZe_price_literal( encoder, prev_byte, cur_byte );
+    e->trials[1].price += LZe_price_literal( e, prev_byte, cur_byte );
   else
-    encoder->trials[1].price +=
-      LZe_price_matched( encoder, prev_byte, cur_byte, match_byte );
+    e->trials[1].price += LZe_price_matched( e, prev_byte, cur_byte, match_byte );
 
   if( match_byte == cur_byte )
-    Tr_update( &encoder->trials[1], rep_match_price +
-               LZe_price_rep_len1( encoder, state, pos_state ), 0, 0 );
+    Tr_update( &e->trials[1], rep_match_price +
+               LZe_price_shortrep( e, state, pos_state ), 0, 0 );
 
   num_trials = max( main_len, replens[rep_index] );
 
   if( num_trials < min_match_len )
     {
-    encoder->trials[0].dis = encoder->trials[1].dis;
-    encoder->trials[0].price = 1;
-    if( !Mf_move_pos( encoder->matchfinder ) ) return 0;
+    e->trials[0].dis = e->trials[1].dis;
+    e->trials[0].price = 1;
+    if( !Mf_move_pos( e->matchfinder ) ) return 0;
     return 1;
     }
 
   for( i = 0; i < num_rep_distances; ++i )
-    encoder->trials[0].reps[i] = reps[i];
-  encoder->trials[1].prev_index = 0;
-  encoder->trials[1].prev_index2 = single_step_trial;
+    e->trials[0].reps[i] = reps[i];
+  e->trials[1].prev_index = 0;
+  e->trials[1].prev_index2 = single_step_trial;
 
   for( len = min_match_len; len <= num_trials; ++len )
-    encoder->trials[len].price = infinite_price;
+    e->trials[len].price = infinite_price;
 
   for( rep = 0; rep < num_rep_distances; ++rep )
     {
     int price;
     if( replens[rep] < min_match_len ) continue;
-    price = rep_match_price + LZe_price_rep( encoder, rep, state, pos_state );
+    price = rep_match_price + LZe_price_rep( e, rep, state, pos_state );
 
     for( len = min_match_len; len <= replens[rep]; ++len )
-      Tr_update( &encoder->trials[len], price +
-                 Lee_price( &encoder->rep_len_encoder, len, pos_state ),
-                 rep, 0 );
+      Tr_update( &e->trials[len], price +
+                 Lee_price( &e->rep_len_encoder, len, pos_state ), rep, 0 );
     }
 
   if( main_len > replens[0] )
     {
-    const int normal_match_price = match_price + price0( encoder->bm_rep[state] );
+    const int normal_match_price = match_price + price0( e->bm_rep[state] );
     i = 0, len = max( replens[0] + 1, min_match_len );
-    while( len > encoder->pairs[i].len ) ++i;
+    while( len > e->pairs[i].len ) ++i;
     while( true )
       {
-      const int dis = encoder->pairs[i].dis;
-      Tr_update( &encoder->trials[len], normal_match_price +
-                 LZe_price_pair( encoder, dis, len, pos_state ),
+      const int dis = e->pairs[i].dis;
+      Tr_update( &e->trials[len], normal_match_price +
+                 LZe_price_pair( e, dis, len, pos_state ),
                  dis + num_rep_distances, 0 );
-      if( ++len > encoder->pairs[i].len && ++i >= num_pairs ) break;
+      if( ++len > e->pairs[i].len && ++i >= num_pairs ) break;
       }
     }
   }
 
-  if( !Mf_move_pos( encoder->matchfinder ) ) return 0;
+  if( !Mf_move_pos( e->matchfinder ) ) return 0;
 
   while( true )				/* price optimization loop */
     {
     struct Trial *cur_trial, *next_trial;
-    int newlen, pos_state, prev_index, prev_index2, available_bytes, len_limit;
+    int newlen, pos_state, available_bytes, len_limit;
     int start_len = min_match_len;
     int next_price, match_price, rep_match_price;
     State cur_state;
@@ -508,120 +500,105 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const encoder,
 
     if( ++cur >= num_trials )		/* no more initialized trials */
       {
-      LZe_backward( encoder, cur );
+      LZe_backward( e, cur );
       return cur;
       }
 
-    num_pairs = LZe_read_match_distances( encoder );
-    newlen = ( num_pairs > 0 ) ? encoder->pairs[num_pairs-1].len : 0;
-    if( newlen >= encoder->matchfinder->match_len_limit )
+    num_pairs = LZe_read_match_distances( e );
+    newlen = ( num_pairs > 0 ) ? e->pairs[num_pairs-1].len : 0;
+    if( newlen >= e->matchfinder->match_len_limit )
       {
-      encoder->pending_num_pairs = num_pairs;
-      LZe_backward( encoder, cur );
+      e->pending_num_pairs = num_pairs;
+      LZe_backward( e, cur );
       return cur;
       }
 
     /* give final values to current trial */
-    cur_trial = &encoder->trials[cur];
-    prev_index = cur_trial->prev_index;
-    prev_index2 = cur_trial->prev_index2;
+    cur_trial = &e->trials[cur];
+    {
+    int dis = cur_trial->dis;
+    int prev_index = cur_trial->prev_index;
+    const int prev_index2 = cur_trial->prev_index2;
 
-    if( prev_index2 != single_step_trial )
+    if( prev_index2 == single_step_trial )
       {
-      --prev_index;
-      if( prev_index2 >= 0 )
+      cur_state = e->trials[prev_index].state;
+      if( prev_index + 1 == cur )			/* len == 1 */
         {
-        cur_state = encoder->trials[prev_index2].state;
-        if( cur_trial->dis2 < num_rep_distances )
-          cur_state = St_set_rep( cur_state );
-        else
-          cur_state = St_set_match( cur_state );
+        if( dis == 0 ) cur_state = St_set_short_rep( cur_state );
+        else cur_state = St_set_char( cur_state );	/* literal */
         }
-      else
-        cur_state = encoder->trials[prev_index].state;
-      cur_state = St_set_char( cur_state );
+      else if( dis < num_rep_distances ) cur_state = St_set_rep( cur_state );
+      else cur_state = St_set_match( cur_state );
       }
-    else
-      cur_state = encoder->trials[prev_index].state;
-
-    if( prev_index == cur - 1 )
+    else if( prev_index2 == dual_step_trial )		/* dis == 0 */
       {
-      if( cur_trial->dis == 0 )
-        cur_state = St_set_short_rep( cur_state );
-      else
-        cur_state = St_set_char( cur_state );
-      for( i = 0; i < num_rep_distances; ++i )
-        cur_trial->reps[i] = encoder->trials[prev_index].reps[i];
+      --prev_index;
+      cur_state = e->trials[prev_index].state;
+      cur_state = St_set_char( cur_state );
+      cur_state = St_set_rep( cur_state );
       }
-    else
+    else	/* if( prev_index2 >= 0 ) */
       {
-      int dis;
-      if( prev_index2 >= 0 )
-        {
-        dis = cur_trial->dis2;
-        prev_index = prev_index2;
-        cur_state = St_set_rep( cur_state );
-        }
-      else
-        {
-        dis = cur_trial->dis;
-        if( dis < num_rep_distances )
-          cur_state = St_set_rep( cur_state );
-        else
-          cur_state = St_set_match( cur_state );
-        }
-      for( i = 0; i < num_rep_distances; ++i )
-        cur_trial->reps[i] = encoder->trials[prev_index].reps[i];
-      LZe_mtf_reps( dis, cur_trial->reps );
+      prev_index = prev_index2;
+      cur_state = e->trials[prev_index].state;
+      if( dis < num_rep_distances ) cur_state = St_set_rep( cur_state );
+      else cur_state = St_set_match( cur_state );
+      cur_state = St_set_char( cur_state );
+      cur_state = St_set_rep( cur_state );
       }
     cur_trial->state = cur_state;
+    for( i = 0; i < num_rep_distances; ++i )
+      cur_trial->reps[i] = e->trials[prev_index].reps[i];
+    mtf_reps( dis, cur_trial->reps );
+    }
 
-    pos_state = Mf_data_position( encoder->matchfinder ) & pos_state_mask;
-    prev_byte = Mf_peek( encoder->matchfinder, -1 );
-    cur_byte = Mf_peek( encoder->matchfinder, 0 );
-    match_byte = Mf_peek( encoder->matchfinder, -cur_trial->reps[0]-1 );
+    pos_state = Mf_data_position( e->matchfinder ) & pos_state_mask;
+    prev_byte = Mf_peek( e->matchfinder, 1 );
+    cur_byte = Mf_peek( e->matchfinder, 0 );
+    match_byte = Mf_peek( e->matchfinder, cur_trial->reps[0] + 1 );
+    if( !Mf_move_pos( e->matchfinder ) ) return 0;
 
     next_price = cur_trial->price +
-                 price0( encoder->bm_match[cur_state][pos_state] );
+                 price0( e->bm_match[cur_state][pos_state] );
     if( St_is_char( cur_state ) )
-      next_price += LZe_price_literal( encoder, prev_byte, cur_byte );
+      next_price += LZe_price_literal( e, prev_byte, cur_byte );
     else
-      next_price += LZe_price_matched( encoder, prev_byte, cur_byte, match_byte );
-    if( !Mf_move_pos( encoder->matchfinder ) ) return 0;
+      next_price += LZe_price_matched( e, prev_byte, cur_byte, match_byte );
 
     /* try last updates to next trial */
-    next_trial = &encoder->trials[cur+1];
+    next_trial = &e->trials[cur+1];
 
-    Tr_update( next_trial, next_price, -1, cur );
+    Tr_update( next_trial, next_price, -1, cur );	/* literal */
 
-    match_price = cur_trial->price + price1( encoder->bm_match[cur_state][pos_state] );
-    rep_match_price = match_price + price1( encoder->bm_rep[cur_state] );
+    match_price = cur_trial->price + price1( e->bm_match[cur_state][pos_state] );
+    rep_match_price = match_price + price1( e->bm_rep[cur_state] );
 
-    if( match_byte == cur_byte && next_trial->dis != 0 )
+    if( match_byte == cur_byte && next_trial->dis != 0 &&
+        next_trial->prev_index2 == single_step_trial )
       {
       const int price = rep_match_price +
-                        LZe_price_rep_len1( encoder, cur_state, pos_state );
+                        LZe_price_shortrep( e, cur_state, pos_state );
       if( price <= next_trial->price )
         {
         next_trial->price = price;
         next_trial->dis = 0;
         next_trial->prev_index = cur;
-        next_trial->prev_index2 = single_step_trial;
         }
       }
 
-    available_bytes = min( Mf_available_bytes( encoder->matchfinder ) + 1,
+    available_bytes = min( Mf_available_bytes( e->matchfinder ) + 1,
                            max_num_trials - 1 - cur );
     if( available_bytes < min_match_len ) continue;
 
-    len_limit = min( encoder->matchfinder->match_len_limit, available_bytes );
+    len_limit = min( e->matchfinder->match_len_limit, available_bytes );
 
     /* try literal + rep0 */
     if( match_byte != cur_byte && next_trial->prev_index != cur )
       {
-      const uint8_t * const data = Mf_ptr_to_current_pos( encoder->matchfinder ) - 1;
+      const uint8_t * const data = Mf_ptr_to_current_pos( e->matchfinder ) - 1;
       const int dis = cur_trial->reps[0] + 1;
-      const int limit = min( encoder->matchfinder->match_len_limit + 1,
+      const int limit = min( e->matchfinder->match_len_limit + 1,
                              available_bytes );
       len = 1;
       while( len < limit && data[len-dis] == data[len] ) ++len;
@@ -630,40 +607,38 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const encoder,
         const int pos_state2 = ( pos_state + 1 ) & pos_state_mask;
         const State state2 = St_set_char( cur_state );
         const int price = next_price +
-                  price1( encoder->bm_match[state2][pos_state2] ) +
-                  price1( encoder->bm_rep[state2] ) +
-                  LZe_price_rep0_len( encoder, len, state2, pos_state2 );
+                  price1( e->bm_match[state2][pos_state2] ) +
+                  price1( e->bm_rep[state2] ) +
+                  LZe_price_rep0_len( e, len, state2, pos_state2 );
         while( num_trials < cur + 1 + len )
-          encoder->trials[++num_trials].price = infinite_price;
-        Tr_update2( &encoder->trials[cur+1+len], price, 0, cur + 1 );
+          e->trials[++num_trials].price = infinite_price;
+        Tr_update2( &e->trials[cur+1+len], price, cur + 1 );
         }
       }
 
     /* try rep distances */
     for( rep = 0; rep < num_rep_distances; ++rep )
       {
-      const uint8_t * const data = Mf_ptr_to_current_pos( encoder->matchfinder ) - 1;
+      const uint8_t * const data = Mf_ptr_to_current_pos( e->matchfinder ) - 1;
       int price;
       const int dis = cur_trial->reps[rep] + 1;
 
-      if( data[-dis] != data[0] || data[1-dis] != data[1] ) continue;
+      if( data[0-dis] != data[0] || data[1-dis] != data[1] ) continue;
       for( len = min_match_len; len < len_limit; ++len )
         if( data[len-dis] != data[len] ) break;
       while( num_trials < cur + len )
-        encoder->trials[++num_trials].price = infinite_price;
-      price = rep_match_price +
-              LZe_price_rep( encoder, rep, cur_state, pos_state );
+        e->trials[++num_trials].price = infinite_price;
+      price = rep_match_price + LZe_price_rep( e, rep, cur_state, pos_state );
       for( i = min_match_len; i <= len; ++i )
-        Tr_update( &encoder->trials[cur+i], price +
-                   Lee_price( &encoder->rep_len_encoder, i, pos_state ),
-                   rep, cur );
+        Tr_update( &e->trials[cur+i], price +
+                   Lee_price( &e->rep_len_encoder, i, pos_state ), rep, cur );
 
       if( rep == 0 ) start_len = len + 1;	/* discard shorter matches */
 
       /* try rep + literal + rep0 */
       {
       int len2 = len + 1, pos_state2;
-      const int limit = min( encoder->matchfinder->match_len_limit + len2,
+      const int limit = min( e->matchfinder->match_len_limit + len2,
                              available_bytes );
       State state2;
       while( len2 < limit && data[len2-dis] == data[len2] ) ++len2;
@@ -672,18 +647,17 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const encoder,
 
       pos_state2 = ( pos_state + len ) & pos_state_mask;
       state2 = St_set_rep( cur_state );
-      price += Lee_price( &encoder->rep_len_encoder, len, pos_state ) +
-               price0( encoder->bm_match[state2][pos_state2] ) +
-               LZe_price_matched( encoder, data[len-1], data[len], data[len-dis] );
+      price += Lee_price( &e->rep_len_encoder, len, pos_state ) +
+               price0( e->bm_match[state2][pos_state2] ) +
+               LZe_price_matched( e, data[len-1], data[len], data[len-dis] );
       pos_state2 = ( pos_state2 + 1 ) & pos_state_mask;
       state2 = St_set_char( state2 );
-      price += price1( encoder->bm_match[state2][pos_state2] ) +
-               price1( encoder->bm_rep[state2] ) +
-               LZe_price_rep0_len( encoder, len2, state2, pos_state2 );
+      price += price1( e->bm_match[state2][pos_state2] ) +
+               price1( e->bm_rep[state2] ) +
+               LZe_price_rep0_len( e, len2, state2, pos_state2 );
       while( num_trials < cur + len + 1 + len2 )
-        encoder->trials[++num_trials].price = infinite_price;
-      Tr_update3( &encoder->trials[cur+len+1+len2], price, 0, cur + len + 1,
-                  rep, cur );
+        e->trials[++num_trials].price = infinite_price;
+      Tr_update3( &e->trials[cur+len+1+len2], price, rep, cur + len + 1, cur );
       }
       }
 
@@ -692,28 +666,27 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const encoder,
       {
       int dis;
       const int normal_match_price = match_price +
-                                     price0( encoder->bm_rep[cur_state] );
+                                     price0( e->bm_rep[cur_state] );
 
       while( num_trials < cur + newlen )
-        encoder->trials[++num_trials].price = infinite_price;
+        e->trials[++num_trials].price = infinite_price;
 
       i = 0;
-      while( start_len > encoder->pairs[i].len ) ++i;
-      dis = encoder->pairs[i].dis;
+      while( start_len > e->pairs[i].len ) ++i;
+      dis = e->pairs[i].dis;
       for( len = start_len; ; ++len )
         {
-        int price = normal_match_price +
-                    LZe_price_pair( encoder, dis, len, pos_state );
+        int price = normal_match_price + LZe_price_pair( e, dis, len, pos_state );
 
-        Tr_update( &encoder->trials[cur+len], price, dis + num_rep_distances, cur );
+        Tr_update( &e->trials[cur+len], price, dis + num_rep_distances, cur );
 
         /* try match + literal + rep0 */
-        if( len == encoder->pairs[i].len )
+        if( len == e->pairs[i].len )
           {
-          const uint8_t * const data = Mf_ptr_to_current_pos( encoder->matchfinder ) - 1;
+          const uint8_t * const data = Mf_ptr_to_current_pos( e->matchfinder ) - 1;
           const int dis2 = dis + 1;
           int len2 = len + 1;
-          const int limit = min( encoder->matchfinder->match_len_limit + len2,
+          const int limit = min( e->matchfinder->match_len_limit + len2,
                                  available_bytes );
           while( len2 < limit && data[len2-dis2] == data[len2] ) ++len2;
           len2 -= len + 1;
@@ -721,21 +694,21 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const encoder,
             {
             int pos_state2 = ( pos_state + len ) & pos_state_mask;
             State state2 = St_set_match( cur_state );
-            price += price0( encoder->bm_match[state2][pos_state2] ) +
-                     LZe_price_matched( encoder, data[len-1], data[len], data[len-dis2] );
+            price += price0( e->bm_match[state2][pos_state2] ) +
+                     LZe_price_matched( e, data[len-1], data[len], data[len-dis2] );
             pos_state2 = ( pos_state2 + 1 ) & pos_state_mask;
             state2 = St_set_char( state2 );
-            price += price1( encoder->bm_match[state2][pos_state2] ) +
-                     price1( encoder->bm_rep[state2] ) +
-                     LZe_price_rep0_len( encoder, len2, state2, pos_state2 );
+            price += price1( e->bm_match[state2][pos_state2] ) +
+                     price1( e->bm_rep[state2] ) +
+                     LZe_price_rep0_len( e, len2, state2, pos_state2 );
 
             while( num_trials < cur + len + 1 + len2 )
-              encoder->trials[++num_trials].price = infinite_price;
-            Tr_update3( &encoder->trials[cur+len+1+len2], price, 0,
-                        cur + len + 1, dis + num_rep_distances, cur );
+              e->trials[++num_trials].price = infinite_price;
+            Tr_update3( &e->trials[cur+len+1+len2], price,
+                        dis + num_rep_distances, cur + len + 1, cur );
             }
           if( ++i >= num_pairs ) break;
-          dis = encoder->pairs[i].dis;
+          dis = e->pairs[i].dis;
           }
         }
       }
@@ -743,118 +716,112 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const encoder,
   }
 
 
-static bool LZe_encode_member( struct LZ_encoder * const encoder )
+static bool LZe_encode_member( struct LZ_encoder * const e )
   {
-  const int fill_count =
-    ( encoder->matchfinder->match_len_limit > 12 ) ? 128 : 512;
+  const int fill_count = ( e->matchfinder->match_len_limit > 12 ) ? 128 : 512;
   int ahead, i;
-  State * const state = &encoder->state;
+  State * const state = &e->state;
 
-  if( encoder->member_finished ) return true;
-  if( Re_member_position( &encoder->renc ) >= encoder->member_size_limit )
+  if( e->member_finished ) return true;
+  if( Re_member_position( &e->renc ) >= e->member_size_limit )
     {
-    if( LZe_full_flush( encoder, *state ) ) encoder->member_finished = true;
+    if( LZe_full_flush( e, *state ) ) e->member_finished = true;
     return true;
     }
 
-  if( Mf_data_position( encoder->matchfinder ) == 0 &&
-      !Mf_finished( encoder->matchfinder ) )	/* encode first byte */
+  if( Mf_data_position( e->matchfinder ) == 0 &&
+      !Mf_finished( e->matchfinder ) )		/* encode first byte */
     {
     const uint8_t prev_byte = 0;
-    uint8_t cur_byte;
-    if( Mf_available_bytes( encoder->matchfinder ) < max_match_len &&
-        !Mf_flushing_or_end( encoder->matchfinder ) )
-      return true;
-    cur_byte = Mf_peek( encoder->matchfinder, 0 );
-    Re_encode_bit( &encoder->renc, &encoder->bm_match[*state][0], 0 );
-    LZe_encode_literal( encoder, prev_byte, cur_byte );
-    CRC32_update_byte( &encoder->crc, cur_byte );
-    Mf_get_match_pairs( encoder->matchfinder, 0 );
-    if( !Mf_move_pos( encoder->matchfinder ) ) return false;
+    const uint8_t cur_byte = Mf_peek( e->matchfinder, 0 );
+    if( !Mf_enough_available_bytes( e->matchfinder ) ||
+        !Re_enough_free_bytes( &e->renc ) ) return true;
+    CRC32_update_byte( &e->crc, cur_byte );
+    Re_encode_bit( &e->renc, &e->bm_match[*state][0], 0 );
+    LZe_encode_literal( e, prev_byte, cur_byte );
+    Mf_get_match_pairs( e->matchfinder, 0 );
+    if( !Mf_move_pos( e->matchfinder ) ) return false;
     }
 
-  while( !Mf_finished( encoder->matchfinder ) )
+  while( !Mf_finished( e->matchfinder ) )
     {
-    if( !Mf_enough_available_bytes( encoder->matchfinder ) ||
-        !Re_enough_free_bytes( &encoder->renc ) ) return true;
-    if( encoder->pending_num_pairs == 0 )
+    if( !Mf_enough_available_bytes( e->matchfinder ) ||
+        !Re_enough_free_bytes( &e->renc ) ) return true;
+    if( e->pending_num_pairs == 0 )
       {
-      if( encoder->fill_counter <= 0 )
-        { LZe_fill_distance_prices( encoder ); encoder->fill_counter = fill_count; }
-      if( encoder->align_price_count <= 0 )
-        LZe_fill_align_prices( encoder );
+      if( e->fill_counter <= 0 )
+        { LZe_fill_distance_prices( e ); e->fill_counter = fill_count; }
+      if( e->align_price_count <= 0 ) LZe_fill_align_prices( e );
       }
 
-    ahead = LZe_sequence_optimizer( encoder, encoder->rep_distances, *state );
+    ahead = LZe_sequence_optimizer( e, e->reps, *state );
     if( ahead <= 0 ) return false;		/* can't happen */
 
-    for( i = 0; ; )
+    for( i = 0; ahead > 0; )
       {
       const int pos_state =
-        ( Mf_data_position( encoder->matchfinder ) - ahead ) & pos_state_mask;
-      const int dis = encoder->trials[i].dis;
-      const int len = encoder->trials[i].price;
+        ( Mf_data_position( e->matchfinder ) - ahead ) & pos_state_mask;
+      const int dis = e->trials[i].dis;
+      const int len = e->trials[i].price;
 
-      bool bit = ( dis < 0 && len == 1 );
-      Re_encode_bit( &encoder->renc,
-                     &encoder->bm_match[*state][pos_state], !bit );
+      bool bit = ( dis < 0 );
+      Re_encode_bit( &e->renc, &e->bm_match[*state][pos_state], !bit );
       if( bit )					/* literal byte */
         {
-        const uint8_t prev_byte = Mf_peek( encoder->matchfinder, -ahead-1 );
-        const uint8_t cur_byte = Mf_peek( encoder->matchfinder, -ahead );
-        CRC32_update_byte( &encoder->crc, cur_byte );
+        const uint8_t prev_byte = Mf_peek( e->matchfinder, ahead + 1 );
+        const uint8_t cur_byte = Mf_peek( e->matchfinder, ahead );
+        CRC32_update_byte( &e->crc, cur_byte );
         if( St_is_char( *state ) )
-          LZe_encode_literal( encoder, prev_byte, cur_byte );
+          LZe_encode_literal( e, prev_byte, cur_byte );
         else
           {
           const uint8_t match_byte =
-            Mf_peek( encoder->matchfinder, -ahead-encoder->rep_distances[0]-1 );
-          LZe_encode_matched( encoder, prev_byte, cur_byte, match_byte );
+            Mf_peek( e->matchfinder, ahead + e->reps[0] + 1 );
+          LZe_encode_matched( e, prev_byte, cur_byte, match_byte );
           }
         *state = St_set_char( *state );
         }
       else					/* match or repeated match */
         {
-        CRC32_update_buf( &encoder->crc, Mf_ptr_to_current_pos( encoder->matchfinder ) - ahead, len );
-        LZe_mtf_reps( dis, encoder->rep_distances );
+        CRC32_update_buf( &e->crc, Mf_ptr_to_current_pos( e->matchfinder ) - ahead, len );
+        mtf_reps( dis, e->reps );
         bit = ( dis < num_rep_distances );
-        Re_encode_bit( &encoder->renc, &encoder->bm_rep[*state], bit );
-        if( bit )
+        Re_encode_bit( &e->renc, &e->bm_rep[*state], bit );
+        if( bit )				/* repeated match */
           {
           bit = ( dis == 0 );
-          Re_encode_bit( &encoder->renc, &encoder->bm_rep0[*state], !bit );
+          Re_encode_bit( &e->renc, &e->bm_rep0[*state], !bit );
           if( bit )
-            Re_encode_bit( &encoder->renc, &encoder->bm_len[*state][pos_state], len > 1 );
+            Re_encode_bit( &e->renc, &e->bm_len[*state][pos_state], len > 1 );
           else
             {
-            Re_encode_bit( &encoder->renc, &encoder->bm_rep1[*state], dis > 1 );
+            Re_encode_bit( &e->renc, &e->bm_rep1[*state], dis > 1 );
             if( dis > 1 )
-              Re_encode_bit( &encoder->renc, &encoder->bm_rep2[*state], dis > 2 );
+              Re_encode_bit( &e->renc, &e->bm_rep2[*state], dis > 2 );
             }
           if( len == 1 ) *state = St_set_short_rep( *state );
           else
             {
-            Lee_encode( &encoder->rep_len_encoder, &encoder->renc, len, pos_state );
+            Lee_encode( &e->rep_len_encoder, &e->renc, len, pos_state );
             *state = St_set_rep( *state );
             }
           }
-        else
+        else					/* match */
           {
-          LZe_encode_pair( encoder, dis - num_rep_distances, len, pos_state );
-          --encoder->fill_counter;
+          LZe_encode_pair( e, dis - num_rep_distances, len, pos_state );
+          --e->fill_counter;
           *state = St_set_match( *state );
           }
         }
       ahead -= len; i += len;
-      if( Re_member_position( &encoder->renc ) >= encoder->member_size_limit )
+      if( Re_member_position( &e->renc ) >= e->member_size_limit )
         {
-        if( !Mf_dec_pos( encoder->matchfinder, ahead ) ) return false;
-        if( LZe_full_flush( encoder, *state ) ) encoder->member_finished = true;
+        if( !Mf_dec_pos( e->matchfinder, ahead ) ) return false;
+        if( LZe_full_flush( e, *state ) ) e->member_finished = true;
         return true;
         }
-      if( ahead <= 0 ) break;
       }
     }
-  if( LZe_full_flush( encoder, *state ) ) encoder->member_finished = true;
+  if( LZe_full_flush( e, *state ) ) e->member_finished = true;
   return true;
   }