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Diffstat (limited to 'src/lzo1a_de.h')
| -rw-r--r-- | src/lzo1a_de.h | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/src/lzo1a_de.h b/src/lzo1a_de.h new file mode 100644 index 0000000..97693b1 --- /dev/null +++ b/src/lzo1a_de.h @@ -0,0 +1,158 @@ +/* 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 +*/ + |