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-rw-r--r--fast_encoder.h70
1 files changed, 70 insertions, 0 deletions
diff --git a/fast_encoder.h b/fast_encoder.h
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+++ b/fast_encoder.h
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+/* Clzip - LZMA lossless data compressor
+ Copyright (C) 2010-2015 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/>.
+*/
+
+struct FLZ_encoder
+ {
+ struct LZ_encoder_base eb;
+ int key4; /* key made from latest 4 bytes */
+ };
+
+static inline void FLZe_reset_key4( struct FLZ_encoder * const fe )
+ {
+ int i;
+ fe->key4 = 0;
+ for( i = 0; i < 3 && i < Mb_available_bytes( &fe->eb.mb ); ++i )
+ fe->key4 = ( fe->key4 << 4 ) ^ fe->eb.mb.buffer[i];
+ }
+
+int FLZe_longest_match_len( struct FLZ_encoder * const fe, int * const distance );
+
+static inline void FLZe_update_and_move( struct FLZ_encoder * const fe, int n )
+ {
+ while( --n >= 0 )
+ {
+ if( Mb_available_bytes( &fe->eb.mb ) >= 4 )
+ {
+ int newpos;
+ fe->key4 = ( ( fe->key4 << 4 ) ^ fe->eb.mb.buffer[fe->eb.mb.pos+3] ) &
+ fe->eb.mb.key4_mask;
+ newpos = fe->eb.mb.prev_positions[fe->key4];
+ fe->eb.mb.prev_positions[fe->key4] = fe->eb.mb.pos + 1;
+ fe->eb.mb.pos_array[fe->eb.mb.cyclic_pos] = newpos;
+ }
+ Mb_move_pos( &fe->eb.mb );
+ }
+ }
+
+static inline bool FLZe_init( struct FLZ_encoder * const fe,
+ const int ifd, const int outfd )
+ {
+ enum { before = 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 };
+
+ return LZeb_init( &fe->eb, before, dict_size, after_size, dict_factor,
+ num_prev_positions23, pos_array_factor, ifd, outfd );
+ }
+
+static inline void FLZe_reset( struct FLZ_encoder * const fe )
+ { LZeb_reset( &fe->eb ); }
+
+bool FLZe_encode_member( struct FLZ_encoder * const fe,
+ const unsigned long long member_size );