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-rw-r--r--fast_encoder.h40
1 files changed, 26 insertions, 14 deletions
diff --git a/fast_encoder.h b/fast_encoder.h
index 3f8125f..486f03f 100644
--- a/fast_encoder.h
+++ b/fast_encoder.h
@@ -1,5 +1,6 @@
/* Lzip - LZMA lossless data compressor
- Copyright (C) 2008, 2009, 2010, 2011, 2012, 2013 Antonio Diaz Diaz.
+ Copyright (C) 2008, 2009, 2010, 2011, 2012, 2013, 2014
+ 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
@@ -22,23 +23,40 @@ class Fmatchfinder : public Matchfinder_base
// bytes to keep in buffer after pos
after_size = max_match_len,
dict_factor = 16,
- len_limit = 16,
num_prev_positions23 = 0,
pos_array_factor = 1 };
int 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];
+ }
+
public:
explicit Fmatchfinder( const int ifd )
:
Matchfinder_base( before_size, dict_size, after_size, dict_factor,
- len_limit, num_prev_positions23, pos_array_factor, ifd ),
- key4( 0 )
- {}
+ num_prev_positions23, pos_array_factor, ifd )
+ { reset_key4(); }
- void reset() { Matchfinder_base::reset(); key4 = 0; }
+ enum { len_limit = 16 };
+ void reset() { Matchfinder_base::reset(); reset_key4(); }
int longest_match_len( int * const distance );
- void longest_match_len( int n );
+
+ void update_and_move( int n )
+ {
+ while( --n >= 0 )
+ {
+ key4 = ( ( key4 << 4 ) ^ buffer[pos+3] ) & key4_mask;
+ const int newpos = prev_positions[key4];
+ prev_positions[key4] = pos + 1;
+ pos_array[cyclic_pos] = newpos;
+ move_pos();
+ }
+ }
};
@@ -46,16 +64,10 @@ class FLZ_encoder : public LZ_encoder_base
{
Fmatchfinder & fmatchfinder;
- void move_pos( int n )
- {
- if( --n >= 0 ) fmatchfinder.move_pos();
- fmatchfinder.longest_match_len( n );
- }
-
public:
FLZ_encoder( Fmatchfinder & mf, const File_header & header, const int outfd )
:
- LZ_encoder_base( header, mf.dictionary_size(), mf.match_len_limit(), outfd ),
+ LZ_encoder_base( header, mf.len_limit, outfd ),
fmatchfinder( mf )
{}