liblzf/lzfP.h

/*
 * Copyright (c) 2000-2007 Marc Alexander Lehmann <schmorp@schmorp.de>
 * 
 * Redistribution and use in source and binary forms, with or without modifica-
 * tion, are permitted provided that the following conditions are met:
 * 
 *   1.  Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 * 
 *   2.  Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License ("GPL") version 2 or any later version,
 * in which case the provisions of the GPL are applicable instead of
 * the above. If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the BSD license, indicate your decision
 * by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL. If you do not delete the
 * provisions above, a recipient may use your version of this file under
 * either the BSD or the GPL.
 */

#ifndef LZFP_h
#define LZFP_h

#define STANDALONE 1 /* at the moment, this is ok. */

#ifndef STANDALONE
# include "lzf.h"
#endif

/*
 * Size of hashtable is (1 << HLOG) * sizeof (char *)
 * decompression is independent of the hash table size
 * the difference between 15 and 14 is very small
 * for small blocks (and 14 is usually a bit faster).
 * For a low-memory/faster configuration, use HLOG == 13;
 * For best compression, use 15 or 16 (or more).
 */
#ifndef HLOG
# define HLOG 15
#endif

/*
 * Sacrifice very little compression quality in favour of compression speed.
 * This gives almost the same compression as the default code, and is
 * (very roughly) 15% faster. This is the preferable mode of operation.
 */

#ifndef VERY_FAST
# define VERY_FAST 1
#endif

/*
 * Sacrifice some more compression quality in favour of compression speed.
 * (roughly 1-2% worse compression for large blocks and
 * 9-10% for small, redundant, blocks and >>20% better speed in both cases)
 * In short: when in need for speed, enable this for binary data,
 * possibly disable this for text data.
 */
#ifndef ULTRA_FAST
# define ULTRA_FAST 0
#endif

/*
 * Unconditionally aligning does not cost very much, so do it if unsure
 */
#ifndef STRICT_ALIGN
# define STRICT_ALIGN !(defined(__i386) || defined (__amd64))
#endif

/*
 * You may choose to pre-set the hash table (might be faster on some
 * modern cpus and large (>>64k) blocks, and also makes compression
 * deterministic/repeatable when the configuration otherwise is the same).
 */
#ifndef INIT_HTAB
# define INIT_HTAB 0
#endif

/*
 * Avoid assigning values to errno variable? for some embedding purposes
 * (linux kernel for example), this is neccessary. NOTE: this breaks
 * the documentation in lzf.h.
 */
#ifndef AVOID_ERRNO
# define AVOID_ERRNO 0
#endif

/*
 * Wether to pass the LZF_STATE variable as argument, or allocate it
 * on the stack. For small-stack environments, define this to 1.
 * NOTE: this breaks the prototype in lzf.h.
 */
#ifndef LZF_STATE_ARG
# define LZF_STATE_ARG 0
#endif

/*
 * Wether to add extra checks for input validity in lzf_decompress
 * and return EINVAL if the input stream has been corrupted. This
 * only shields against overflowing the input buffer and will not
 * detect most corrupted streams.
 * This check is not normally noticable on modern hardware
 * (<1% slowdown), but might slow down older cpus considerably.
 */
#ifndef CHECK_INPUT
# define CHECK_INPUT 1
#endif

/*****************************************************************************/
/* nothing should be changed below */

typedef unsigned char u8;

typedef const u8 *LZF_STATE[1 << (HLOG)];

#if !STRICT_ALIGN
/* for unaligned accesses we need a 16 bit datatype. */
# include <limits.h>
# if USHRT_MAX == 65535
    typedef unsigned short u16;
# elif UINT_MAX == 65535
    typedef unsigned int u16;
# else
#  undef STRICT_ALIGN
#  define STRICT_ALIGN 1
# endif
#endif

#if ULTRA_FAST
# if defined(VERY_FAST)
#  undef VERY_FAST
# endif
#endif

#if INIT_HTAB
# ifdef __cplusplus
#  include <cstring>
# else
#  include <string.h>
# endif
#endif

#endif

Revision:	1.17
Committed:	Mon Nov 5 23:28:40 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.16:	+9 -8 lines
Log Message:	* empty log message *
#	Content
1	/*
2	* Copyright (c) 2000-2007 Marc Alexander Lehmann <schmorp@schmorp.de>
3	*
4	* Redistribution and use in source and binary forms, with or without modifica-
5	* tion, are permitted provided that the following conditions are met:
6	*
7	* 1. Redistributions of source code must retain the above copyright notice,
8	* this list of conditions and the following disclaimer.
9	*
10	* 2. Redistributions in binary form must reproduce the above copyright
11	* notice, this list of conditions and the following disclaimer in the
12	* documentation and/or other materials provided with the distribution.
13	*
14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
15	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
16	* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
17	* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
18	* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20	* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
21	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
22	* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
23	* OF THE POSSIBILITY OF SUCH DAMAGE.
24	*
25	* Alternatively, the contents of this file may be used under the terms of
26	* the GNU General Public License ("GPL") version 2 or any later version,
27	* in which case the provisions of the GPL are applicable instead of
28	* the above. If you wish to allow the use of your version of this file
29	* only under the terms of the GPL and not to allow others to use your
30	* version of this file under the BSD license, indicate your decision
31	* by deleting the provisions above and replace them with the notice
32	* and other provisions required by the GPL. If you do not delete the
33	* provisions above, a recipient may use your version of this file under
34	* either the BSD or the GPL.
35	*/
36
37	#ifndef LZFP_h
38	#define LZFP_h
39
40	#define STANDALONE 1 /* at the moment, this is ok. */
41
42	#ifndef STANDALONE
43	# include "lzf.h"
44	#endif
45
46	/*
47	* Size of hashtable is (1 << HLOG) * sizeof (char *)
48	* decompression is independent of the hash table size
49	* the difference between 15 and 14 is very small
50	* for small blocks (and 14 is usually a bit faster).
51	* For a low-memory/faster configuration, use HLOG == 13;
52	* For best compression, use 15 or 16 (or more).
53	*/
54	#ifndef HLOG
55	# define HLOG 15
56	#endif
57
58	/*
59	* Sacrifice very little compression quality in favour of compression speed.
60	* This gives almost the same compression as the default code, and is
61	* (very roughly) 15% faster. This is the preferable mode of operation.
62	*/
63
64	#ifndef VERY_FAST
65	# define VERY_FAST 1
66	#endif
67
68	/*
69	* Sacrifice some more compression quality in favour of compression speed.
70	* (roughly 1-2% worse compression for large blocks and
71	* 9-10% for small, redundant, blocks and >>20% better speed in both cases)
72	* In short: when in need for speed, enable this for binary data,
73	* possibly disable this for text data.
74	*/
75	#ifndef ULTRA_FAST
76	# define ULTRA_FAST 0
77	#endif
78
79	/*
80	* Unconditionally aligning does not cost very much, so do it if unsure
81	*/
82	#ifndef STRICT_ALIGN
83	# define STRICT_ALIGN !(defined(__i386) \|\| defined (__amd64))
84	#endif
85
86	/*
87	* You may choose to pre-set the hash table (might be faster on some
88	* modern cpus and large (>>64k) blocks, and also makes compression
89	* deterministic/repeatable when the configuration otherwise is the same).
90	*/
91	#ifndef INIT_HTAB
92	# define INIT_HTAB 0
93	#endif
94
95	/*
96	* Avoid assigning values to errno variable? for some embedding purposes
97	* (linux kernel for example), this is neccessary. NOTE: this breaks
98	* the documentation in lzf.h.
99	*/
100	#ifndef AVOID_ERRNO
101	# define AVOID_ERRNO 0
102	#endif
103
104	/*
105	* Wether to pass the LZF_STATE variable as argument, or allocate it
106	* on the stack. For small-stack environments, define this to 1.
107	* NOTE: this breaks the prototype in lzf.h.
108	*/
109	#ifndef LZF_STATE_ARG
110	# define LZF_STATE_ARG 0
111	#endif
112
113	/*
114	* Wether to add extra checks for input validity in lzf_decompress
115	* and return EINVAL if the input stream has been corrupted. This
116	* only shields against overflowing the input buffer and will not
117	* detect most corrupted streams.
118	* This check is not normally noticable on modern hardware
119	* (<1% slowdown), but might slow down older cpus considerably.
120	*/
121	#ifndef CHECK_INPUT
122	# define CHECK_INPUT 1
123	#endif
124
125	/*****************************************************************************/
126	/* nothing should be changed below */
127
128	typedef unsigned char u8;
129
130	typedef const u8 *LZF_STATE[1 << (HLOG)];
131
132	#if !STRICT_ALIGN
133	/* for unaligned accesses we need a 16 bit datatype. */
134	# include <limits.h>
135	# if USHRT_MAX == 65535
136	typedef unsigned short u16;
137	# elif UINT_MAX == 65535
138	typedef unsigned int u16;
139	# else
140	# undef STRICT_ALIGN
141	# define STRICT_ALIGN 1
142	# endif
143	#endif
144
145	#if ULTRA_FAST
146	# if defined(VERY_FAST)
147	# undef VERY_FAST
148	# endif
149	#endif
150
151	#if INIT_HTAB
152	# ifdef __cplusplus
153	# include <cstring>
154	# else
155	# include <string.h>
156	# endif
157	#endif
158
159	#endif
160