diff options
Diffstat (limited to 'src/liblzf/lzfP.h')
| -rw-r--r-- | src/liblzf/lzfP.h | 68 |
1 files changed, 35 insertions, 33 deletions
diff --git a/src/liblzf/lzfP.h b/src/liblzf/lzfP.h index 48963b2..d533f18 100644 --- a/src/liblzf/lzfP.h +++ b/src/liblzf/lzfP.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2000-2005 Marc Alexander Lehmann <schmorp@schmorp.de> + * 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: @@ -11,9 +11,6 @@ * 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 @@ -26,14 +23,15 @@ * OF THE POSSIBILITY OF SUCH DAMAGE. * * Alternatively, the contents of this file may be used under the terms of - * the GNU General Public License version 2 (the "GPL"), 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. + * 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 @@ -46,29 +44,28 @@ #endif /* - * size of hashtable is (1 << HLOG) * sizeof (char *) + * 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 but faster). + * 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). + * For best compression, use 15 or 16 (or more, up to 23). */ #ifndef HLOG -# define HLOG 14 +# define HLOG 16 #endif /* - * sacrifice very little compression quality in favour of compression speed. + * 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 preferable mode of operation. + * (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. + * 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, @@ -79,30 +76,23 @@ #endif /* - * unconditionally aligning does not cost very much, so do it if unsure + * Unconditionally aligning does not cost very much, so do it if unsure */ #ifndef STRICT_ALIGN # define STRICT_ALIGN !(defined(__i386) || defined (__amd64)) #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 some - * modern cpus and large (>>64k) blocks) + * 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 + * Avoid assigning values to errno variable? for some embedding purposes * (linux kernel for example), this is neccessary. NOTE: this breaks * the documentation in lzf.h. */ @@ -119,6 +109,18 @@ # define LZF_STATE_ARG 0 #endif +/* + * Wether 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 noticable on modern hardware + * (<1% slowdown), but might slow down older cpus considerably. + */ +#ifndef CHECK_INPUT +# define CHECK_INPUT 1 +#endif + /*****************************************************************************/ /* nothing should be changed below */ @@ -145,7 +147,7 @@ typedef const u8 *LZF_STATE[1 << (HLOG)]; # endif #endif -#if USE_MEMCPY || INIT_HTAB +#if INIT_HTAB # ifdef __cplusplus # include <cstring> # else |