summaryrefslogtreecommitdiff
path: root/lzo/src/lzo1a_de.h
diff options
context:
space:
mode:
authorArne Schwabe <arne@rfc2549.org>2012-04-16 19:21:14 +0200
committerArne Schwabe <arne@rfc2549.org>2012-04-16 19:21:14 +0200
commit3e4d8f433239c40311037616b1b8833a06651ae0 (patch)
tree98ab7fce0d011d34677b0beb762d389cb5c39199 /lzo/src/lzo1a_de.h
Initial import
Diffstat (limited to 'lzo/src/lzo1a_de.h')
-rw-r--r--lzo/src/lzo1a_de.h158
1 files changed, 158 insertions, 0 deletions
diff --git a/lzo/src/lzo1a_de.h b/lzo/src/lzo1a_de.h
new file mode 100644
index 00000000..97693b1f
--- /dev/null
+++ b/lzo/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
+*/
+