1 files changed, 61 insertions, 0 deletions
diff --git a/fast_encoder.h b/fast_encoder.h
new file mode 100644
index 0000000..e4c97dc
--- /dev/null
+++ b/fast_encoder.h
@@ -0,0 +1,61 @@
+/* Lzip - LZMA lossless data compressor
+   Copyright (C) 2008-2024 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/>.
+*/
+
+class FLZ_encoder : public LZ_encoder_base
+  {
+  unsigned key4;			// key made from latest 4 bytes
+
+  void reset_key4()
+    {
+    key4 = 0;
+    for( int i = 0; i < 3 && i < available_bytes(); ++i )
+      key4 = ( key4 << 4 ) ^ buffer[i];
+    }
+
+  int longest_match_len( int * const distance );
+
+  void update_and_move( int n )
+    {
+    while( --n >= 0 )
+      {
+      if( available_bytes() >= 4 )
+        {
+        key4 = ( ( key4 << 4 ) ^ buffer[pos+3] ) & key4_mask;
+        pos_array[cyclic_pos] = prev_positions[key4];
+        prev_positions[key4] = pos + 1;
+        }
+      move_pos();
+      }
+    }
+
+  enum { before_size = 0,
+         dict_size = 65536,
+         // bytes to keep in buffer after pos
+         after_size = max_match_len,
+         dict_factor = 16,
+         num_prev_positions23 = 0,
+         pos_array_factor = 1 };
+
+public:
+  FLZ_encoder( const int ifd, const int outfd )
+    :
+    LZ_encoder_base( before_size, dict_size, after_size, dict_factor,
+                     num_prev_positions23, pos_array_factor, ifd, outfd )
+    {}
+
+  bool encode_member( const unsigned long long member_size );
+  };