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159 lines
5 KiB
C
159 lines
5 KiB
C
/*
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* Copyright (c) 2000-2007 Marc Alexander Lehmann <schmorp@schmorp.de>
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*
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* Redistribution and use in source and binary forms, with or without modifica-
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* tion, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
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* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
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* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
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* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Alternatively, the contents of this file may be used under the terms of
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* the GNU General Public License ("GPL") version 2 or any later version,
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* in which case the provisions of the GPL are applicable instead of
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* the above. If you wish to allow the use of your version of this file
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* only under the terms of the GPL and not to allow others to use your
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* version of this file under the BSD license, indicate your decision
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* by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL. If you do not delete the
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* provisions above, a recipient may use your version of this file under
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* either the BSD or the GPL.
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*/
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#ifndef LZFP_h
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#define LZFP_h
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#define STANDALONE 1 /* at the moment, this is ok. */
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#ifndef STANDALONE
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# include "lzf.h"
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#endif
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/*
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* Size of hashtable is (1 << HLOG) * sizeof (char *)
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* decompression is independent of the hash table size
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* the difference between 15 and 14 is very small
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* for small blocks (and 14 is usually a bit faster).
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* For a low-memory/faster configuration, use HLOG == 13;
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* For best compression, use 15 or 16 (or more, up to 23).
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*/
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#ifndef HLOG
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# define HLOG 16
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#endif
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/*
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* Sacrifice very little compression quality in favour of compression speed.
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* This gives almost the same compression as the default code, and is
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* (very roughly) 15% faster. This is the preferred mode of operation.
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*/
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#ifndef VERY_FAST
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# define VERY_FAST 1
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#endif
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/*
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* Sacrifice some more compression quality in favour of compression speed.
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* (roughly 1-2% worse compression for large blocks and
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* 9-10% for small, redundant, blocks and >>20% better speed in both cases)
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* In short: when in need for speed, enable this for binary data,
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* possibly disable this for text data.
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*/
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#ifndef ULTRA_FAST
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# define ULTRA_FAST 0
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#endif
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/*
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* Unconditionally aligning does not cost very much, so do it if unsure
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*/
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#ifndef STRICT_ALIGN
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# define STRICT_ALIGN !(defined(__i386) || defined (__amd64))
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#endif
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/*
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* You may choose to pre-set the hash table (might be faster on some
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* modern cpus and large (>>64k) blocks, and also makes compression
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* deterministic/repeatable when the configuration otherwise is the same).
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*/
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#ifndef INIT_HTAB
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# define INIT_HTAB 0
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#endif
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/*
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* Avoid assigning values to errno variable? for some embedding purposes
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* (linux kernel for example), this is neccessary. NOTE: this breaks
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* the documentation in lzf.h.
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*/
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#ifndef AVOID_ERRNO
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# define AVOID_ERRNO 0
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#endif
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/*
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* Wether to pass the LZF_STATE variable as argument, or allocate it
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* on the stack. For small-stack environments, define this to 1.
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* NOTE: this breaks the prototype in lzf.h.
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*/
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#ifndef LZF_STATE_ARG
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# define LZF_STATE_ARG 0
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#endif
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/*
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* Wether to add extra checks for input validity in lzf_decompress
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* and return EINVAL if the input stream has been corrupted. This
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* only shields against overflowing the input buffer and will not
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* detect most corrupted streams.
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* This check is not normally noticable on modern hardware
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* (<1% slowdown), but might slow down older cpus considerably.
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*/
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#ifndef CHECK_INPUT
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# define CHECK_INPUT 1
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#endif
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/*****************************************************************************/
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/* nothing should be changed below */
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typedef unsigned char u8;
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typedef const u8 *LZF_STATE[1 << (HLOG)];
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#if !STRICT_ALIGN
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/* for unaligned accesses we need a 16 bit datatype. */
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# include <limits.h>
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# if USHRT_MAX == 65535
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typedef unsigned short u16;
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# elif UINT_MAX == 65535
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typedef unsigned int u16;
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# else
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# undef STRICT_ALIGN
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# define STRICT_ALIGN 1
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# endif
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#endif
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#if ULTRA_FAST
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# if defined(VERY_FAST)
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# undef VERY_FAST
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# endif
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#endif
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#if INIT_HTAB
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# ifdef __cplusplus
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# include <cstring>
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# else
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# include <string.h>
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# endif
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#endif
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#endif
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