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/* |
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* Copyright (c) 2000 Marc Alexander Lehmann <pcg@goof.com> |
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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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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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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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#ifndef LZFP_h |
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#define LZFP_h |
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#define STANDALONE /* 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 also faster). |
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* For a low-memory configuration, use HLOG == 13; |
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* For best compression, use 15 or 16. |
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*/ |
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#ifndef HLOG |
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# define HLOG 14 |
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#endif |
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/* |
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* sacrifice some 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: enable this for binary data, disable this for text data. |
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*/ |
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#ifndef ULTRA_FAST |
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# define ULTRA_FAST 1 |
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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) |
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#endif |
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/* |
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* use string functions to copy memory. |
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* this is usually a loss, even with glibc's optimized memcpy |
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*/ |
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#ifndef USE_MEMCPY |
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# define USE_MEMCPY 0 |
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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 modern cpus |
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* and large (>>64k) blocks) |
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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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/* nothing should be changed below */ |
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typedef unsigned char u8; |
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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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# warn need 16 bit datatype when STRICT_ALIGN == 0, this is non-fatal |
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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 USE_MEMCPY || INIT_HTAB |
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# include <string.h> |
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#endif |
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#endif |
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