diff options
Diffstat (limited to 'src/lzfP.h')
| -rw-r--r-- | src/lzfP.h | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/src/lzfP.h b/src/lzfP.h new file mode 100644 index 0000000..567f5a2 --- /dev/null +++ b/src/lzfP.h @@ -0,0 +1,190 @@ +/* + * 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, up to 22). + */ +#ifndef HLOG +# define HLOG 16 +#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 preferred 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 +# if !(defined(__i386) || defined (__amd64)) +# define STRICT_ALIGN 1 +# else +# define STRICT_ALIGN 0 +# endif +#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 necessary. NOTE: this breaks + * the documentation in lzf.h. Avoiding errno has no speed impact. + */ +#ifndef AVOID_ERRNO +# define AVOID_ERRNO 0 +#endif + +/* + * Whether 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 + +/* + * Whether 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 noticeable on modern hardware + * (<1% slowdown), but might slow down older cpus considerably. + */ +#ifndef CHECK_INPUT +# define CHECK_INPUT 1 +#endif + +/* + * Whether to store pointers or offsets inside the hash table. On + * 64 bit architectures, pointers take up twice as much space, + * and might also be slower. Default is to autodetect. + * Notice: Don't set this value to 1, it will result in 'LZF_HSLOT' + * not being able to store offset above UINT32_MAX in 64bit. */ +#define LZF_USE_OFFSETS 0 + +/*****************************************************************************/ +/* nothing should be changed below */ + +#ifdef __cplusplus +# include <cstring> +# include <climits> +using namespace std; +#else +# include <string.h> +# include <limits.h> +#endif + +#ifndef LZF_USE_OFFSETS +# if defined (WIN32) +# define LZF_USE_OFFSETS defined(_M_X64) +# else +# if __cplusplus > 199711L +# include <cstdint> +# else +# include <stdint.h> +# endif +# define LZF_USE_OFFSETS (UINTPTR_MAX > 0xffffffffU) +# endif +#endif + +typedef unsigned char u8; + +#if LZF_USE_OFFSETS +# define LZF_HSLOT_BIAS ((const u8 *)in_data) + typedef unsigned int LZF_HSLOT; +#else +# define LZF_HSLOT_BIAS 0 + typedef const u8 *LZF_HSLOT; +#endif + +typedef LZF_HSLOT LZF_STATE[1 << (HLOG)]; + +#if !STRICT_ALIGN +/* for unaligned accesses we need a 16 bit datatype. */ +# 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 +# undef VERY_FAST +#endif + +#endif + |