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Diffstat (limited to 'lzfP.h')
| -rw-r--r-- | lzfP.h | 107 |
1 files changed, 107 insertions, 0 deletions
@@ -0,0 +1,107 @@ +/* + * Copyright (c) 2000 Marc Alexander Lehmann <pcg@goof.com> + * + * 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. + * + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * 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. + */ + +#ifndef LZFP_h +#define LZFP_h + +#define STANDALONE /* 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 also faster). + * For a low-memory configuration, use HLOG == 13; + * For best compression, use 15 or 16. + */ +#ifndef HLOG +# define HLOG 14 +#endif + +/* + * sacrifice some 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: enable this for binary data, disable this for text data. + */ +#ifndef ULTRA_FAST +# define ULTRA_FAST 1 +#endif + +/* + * unconditionally aligning does not cost very much, so do it if unsure + */ +#ifndef STRICT_ALIGN +# define STRICT_ALIGN !defined(__i386) +#endif + +/* + * use string functions to copy memory. + * this is usually a loss, even with glibc's optimized memcpy + */ +#ifndef USE_MEMCPY +# define USE_MEMCPY 0 +#endif + +/* + * you may choose to pre-set the hash table (might be faster on modern cpus + * and large (>>64k) blocks) + */ +#ifndef INIT_HTAB +# define INIT_HTAB 0 +#endif + +/*****************************************************************************/ +/* nothing should be changed below */ + +typedef unsigned char u8; + +#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 +# warn need 16 bit datatype when STRICT_ALIGN == 0, this is non-fatal +# undef STRICT_ALIGN +# define STRICT_ALIGN 1 +# endif +#endif + +#if USE_MEMCPY || INIT_HTAB +# include <string.h> +#endif + +#endif + |