| /* lzo1a_de.h -- definitions for the the LZO1A algorithm |
| |
| This file is part of the LZO real-time data compression library. |
| |
| Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer |
| Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer |
| Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer |
| Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer |
| Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer |
| Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer |
| Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer |
| Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer |
| Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer |
| Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer |
| Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer |
| Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer |
| Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer |
| All Rights Reserved. |
| |
| The LZO library 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. |
| |
| The LZO library 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 the LZO library; see the file COPYING. |
| If not, write to the Free Software Foundation, Inc., |
| 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| |
| Markus F.X.J. Oberhumer |
| <markus@oberhumer.com> |
| http://www.oberhumer.com/opensource/lzo/ |
| */ |
| |
| |
| /* WARNING: this file should *not* be used by applications. It is |
| part of the implementation of the LZO package and is subject |
| to change. |
| */ |
| |
| |
| #ifndef __LZO_DEFS_H |
| #define __LZO_DEFS_H |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| |
| /*********************************************************************** |
| // |
| ************************************************************************/ |
| |
| /* |
| Format of the marker byte |
| |
| |
| 76543210 |
| -------- |
| 00000000 a long literal run ('R0' run) - there are short and long R0 runs |
| 000rrrrr a short literal run with len r |
| mmmooooo a short match (len = 2+m, o = offset low bits) |
| 111ooooo a long match (o = offset low bits) |
| */ |
| |
| |
| #define RSIZE (1 << RBITS) |
| #define RMASK (RSIZE - 1) |
| |
| #define MBITS (8 - OBITS) |
| #define MSIZE (1 << MBITS) |
| #define MMASK (MSIZE - 1) |
| |
| #define OBITS RBITS /* offset and run-length use same bits */ |
| #define OSIZE (1 << OBITS) |
| #define OMASK (OSIZE - 1) |
| |
| |
| /* additional bits for coding the length in a long match */ |
| #define LBITS 8 |
| #define LSIZE (1 << LBITS) |
| #define LMASK (LSIZE - 1) |
| |
| |
| /*********************************************************************** |
| // some macros to improve readability |
| ************************************************************************/ |
| |
| /* Minimum len of a match */ |
| #define MIN_MATCH 3 |
| #define THRESHOLD (MIN_MATCH - 1) |
| |
| /* Min-/Maximum len of a match coded in 2 bytes */ |
| #define MIN_MATCH_SHORT (MIN_MATCH) |
| #define MAX_MATCH_SHORT (MIN_MATCH_SHORT + (MSIZE - 2) - 1) |
| /* why (MSIZE - 2) ? because 0 is used to mark runs, |
| * and MSIZE-1 is used to mark a long match */ |
| |
| /* Min-/Maximum len of a match coded in 3 bytes */ |
| #define MIN_MATCH_LONG (MAX_MATCH_SHORT + 1) |
| #define MAX_MATCH_LONG (MIN_MATCH_LONG + LSIZE - 1) |
| |
| /* Min-/Maximum offset of a match */ |
| #define MIN_OFFSET 1 |
| #define MAX_OFFSET (1 << (CHAR_BIT + OBITS)) |
| |
| |
| /* R0 literal run (a long run) */ |
| |
| #define R0MIN (RSIZE) /* Minimum len of R0 run of literals */ |
| #define R0MAX (R0MIN + 255) /* Maximum len of R0 run of literals */ |
| #define R0FAST (R0MAX & ~7) /* R0MAX aligned to 8 byte boundary */ |
| |
| #if (R0MAX - R0FAST != 7) || ((R0FAST & 7) != 0) |
| # error "something went wrong" |
| #endif |
| |
| /* 7 special codes from R0FAST+1 .. R0MAX |
| * these codes mean long R0 runs with lengths |
| * 512, 1024, 2048, 4096, 8192, 16384, 32768 */ |
| |
| |
| /* |
| |
| RBITS | MBITS MIN THR. MSIZE MAXS MINL MAXL MAXO R0MAX R0FAST |
| ======+=============================================================== |
| 3 | 5 3 2 32 32 33 288 2048 263 256 |
| 4 | 4 3 2 16 16 17 272 4096 271 264 |
| 5 | 3 3 2 8 8 9 264 8192 287 280 |
| |
| */ |
| |
| |
| /*********************************************************************** |
| // |
| ************************************************************************/ |
| |
| #define DBITS 13 |
| #include "lzo_dict.h" |
| #define DVAL_LEN DVAL_LOOKAHEAD |
| |
| |
| |
| #ifdef __cplusplus |
| } /* extern "C" */ |
| #endif |
| |
| #endif /* already included */ |
| |
| /* |
| vi:ts=4:et |
| */ |
| |
