diff options
| -rw-r--r-- | Changes | 9 | ||||
| -rw-r--r-- | lzfP.h | 30 |
2 files changed, 30 insertions, 9 deletions
@@ -1,3 +1,12 @@ + +1.6 Fri Jul 7 17:31:26 CEST 2006 + - the lzf example utility will now uncompress if invoked + as "unlzf" (patch by Scott Feeney). + - add CHECK_INPUT option that adds more checks for input + data validity. + - help applications that do not pass in the correct length + (such as php) by returning either EINVAL or E2BIG. + 1.51 Thu Apr 14 22:15:46 CEST 2005 - incorporated C♯ implementation of both the en- and decoder, written by "Oren J. Maurice <oymaurice@hazorea.org.il>". @@ -46,19 +46,19 @@ #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). */ #ifndef HLOG -# define HLOG 14 +# define HLOG 15 #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. */ @@ -68,7 +68,7 @@ #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, @@ -79,14 +79,14 @@ #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. + * Use string functions to copy memory. * this is usually a loss, even with glibc's optimized memcpy */ #ifndef USE_MEMCPY @@ -94,7 +94,7 @@ #endif /* - * you may choose to pre-set the hash table (might be faster on some + * You may choose to pre-set the hash table (might be faster on some * modern cpus and large (>>64k) blocks) */ #ifndef INIT_HTAB @@ -102,7 +102,7 @@ #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 +119,18 @@ # 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 0 +#endif + /*****************************************************************************/ /* nothing should be changed below */ |