diff options
Diffstat (limited to 'src/lzfP.h')
-rw-r--r-- | src/lzfP.h | 56 |
1 files changed, 41 insertions, 15 deletions
diff --git a/src/lzfP.h b/src/lzfP.h index c9eae3f6a..c6d2e096c 100644 --- a/src/lzfP.h +++ b/src/lzfP.h @@ -49,7 +49,7 @@ * the difference between 15 and 14 is very small * 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, up to 23). + * For best compression, use 15 or 16 (or more, up to 22). */ #ifndef HLOG # define HLOG 16 @@ -94,7 +94,7 @@ /* * Avoid assigning values to errno variable? for some embedding purposes * (linux kernel for example), this is necessary. NOTE: this breaks - * the documentation in lzf.h. + * the documentation in lzf.h. Avoiding errno has no speed impact. */ #ifndef AVOID_ERRNO # define AVOID_ERRNO 0 @@ -121,16 +121,52 @@ # define CHECK_INPUT 1 #endif +/* + * Whether to store pointers or offsets inside the hash table. On + * 64 bit architetcures, pointers take up twice as much space, + * and might also be slower. Default is to autodetect. + */ +/*#define LZF_USER_OFFSETS autodetect */ + /*****************************************************************************/ /* nothing should be changed below */ +#ifdef __cplusplus +# include <cstring> +# include <climits> +using namespace std; +#else +# include <string.h> +# include <limits.h> +#endif + +#ifndef LZF_USE_OFFSETS +# if defined (WIN32) +# define LZF_USE_OFFSETS defined(_M_X64) +# else +# if __cplusplus > 199711L +# include <cstdint> +# else +# include <stdint.h> +# endif +# define LZF_USE_OFFSETS (UINTPTR_MAX > 0xffffffffU) +# endif +#endif + typedef unsigned char u8; -typedef const u8 *LZF_STATE[1 << (HLOG)]; +#if LZF_USE_OFFSETS +# define LZF_HSLOT_BIAS ((const u8 *)in_data) + typedef unsigned int LZF_HSLOT; +#else +# define LZF_HSLOT_BIAS 0 + typedef const u8 *LZF_HSLOT; +#endif + +typedef LZF_HSLOT LZF_STATE[1 << (HLOG)]; #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 @@ -142,17 +178,7 @@ typedef const u8 *LZF_STATE[1 << (HLOG)]; #endif #if ULTRA_FAST -# if defined(VERY_FAST) -# undef VERY_FAST -# endif -#endif - -#if INIT_HTAB -# ifdef __cplusplus -# include <cstring> -# else -# include <string.h> -# endif +# undef VERY_FAST #endif #endif |