/* * Copyright (c) 2000-2007 Marc Alexander Lehmann * * 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 # 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 1 #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 the target CPU has a slow multiplication. This affects * the default hash function for the compressor, and enables a slightly * worse hash function that needs only shifts. */ #ifndef MULTIPLICATION_IS_SLOW # define MULTIPLICATION_IS_SLOW 0 #endif /* * If defined, then this data type will be used for storing offsets. * This can be useful if you want to use a huge hashtable, want to * conserve memory, or both, and your data fits into e.g. 64kb. * If instead you want to compress data > 4GB, then it's better to * to "#define LZF_USE_OFFSETS 0" instead. */ /*#define LZF_HSLOT unsigned short*/ /* * Whether to store pointers or offsets inside the hash table. On * 64 bit architetcures, pointers take up twice as much space, * and might also be slower. Default is to autodetect. */ /*#define LZF_USE_OFFSETS autodetect */ /*****************************************************************************/ /* nothing should be changed below */ #ifdef __cplusplus # include # include using namespace std; #else # include # include #endif #ifndef LZF_USE_OFFSETS # if defined (WIN32) || defined (_WIN32) # define LZF_USE_OFFSETS defined(_M_X64) # else # if __cplusplus > 199711L # include # else # include # endif # define LZF_USE_OFFSETS (UINTPTR_MAX > 0xffffffffU) # endif #endif typedef unsigned char u8; #ifdef LZF_HSLOT # define LZF_HSLOT_BIAS ((const u8 *)in_data) #else # 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 #endif typedef LZF_HSLOT LZF_STATE[1 << (HLOG)]; #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 #if ULTRA_FAST # undef VERY_FAST #endif #endif