From 74b9339658d8ea3690d32c237223e5974b601ed9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 4 May 2024 16:23:32 +0200 Subject: Adding upstream version 1.23. Signed-off-by: Daniel Baumann --- fast_encoder.h | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 fast_encoder.h (limited to 'fast_encoder.h') diff --git a/fast_encoder.h b/fast_encoder.h new file mode 100644 index 0000000..c41f9e4 --- /dev/null +++ b/fast_encoder.h @@ -0,0 +1,61 @@ +/* Lzip - LZMA lossless data compressor + Copyright (C) 2008-2022 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 . +*/ + +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 ); + }; -- cgit v1.2.3