Initial commit: client source

2026-08-17 20:03:02 +02:00
commit 9ae37cd0ea
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+/* lzo1a_de.h -- definitions for the the LZO1A algorithm
+
+   This file is part of the LZO real-time data compression library.
+
+   Copyright (C) 1996-2002 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.,
+   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+   Markus F.X.J. Oberhumer
+   <markus@oberhumer.com>
+ */
+
+
+/* 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
+*/
+