diff options
Diffstat (limited to 'include/myisam.h')
| -rw-r--r-- | include/myisam.h | 81 |
1 files changed, 75 insertions, 6 deletions
diff --git a/include/myisam.h b/include/myisam.h index 7d3f0e0c801..03194fe42ae 100644 --- a/include/myisam.h +++ b/include/myisam.h @@ -35,14 +35,26 @@ extern "C" { /* defines used by myisam-funktions */ -/* The following defines can be increased if necessary */ -#define MI_MAX_KEY 64 /* Max allowed keys */ -#define MI_MAX_KEY_SEG 16 /* Max segments for key */ -#define MI_MAX_KEY_LENGTH 1000 +/* + There is a hard limit for the maximum number of keys as there are only + 8 bits in the index file header for the number of keys in a table. + This means that 0..255 keys can exist for a table. The idea of + MI_MAX_POSSIBLE_KEY is to ensure that one can use myisamchk & tools on + a MyISAM table for which one has more keys than MyISAM is normally + compiled for. If you don't have this, you will get a core dump when + running myisamchk compiled for 128 keys on a table with 255 keys. +*/ +#define MI_MAX_POSSIBLE_KEY 255 /* For myisam_chk */ +#define MI_MAX_POSSIBLE_KEY_BUFF (1024+6+6) /* For myisam_chk */ +/* + The following defines can be increased if necessary. + BUT: MI_MAX_KEY must be <= MI_MAX_POSSIBLE_KEY. +*/ +#define MI_MAX_KEY 64 /* Max allowed keys */ +#define MI_MAX_KEY_SEG 16 /* Max segments for key */ +#define MI_MAX_KEY_LENGTH 1000 #define MI_MAX_KEY_BUFF (MI_MAX_KEY_LENGTH+MI_MAX_KEY_SEG*6+8+8) -#define MI_MAX_POSSIBLE_KEY_BUFF (1024+6+6) /* For myisam_chk */ -#define MI_MAX_POSSIBLE_KEY 64 /* For myisam_chk */ #define MI_MAX_MSG_BUF 1024 /* used in CHECK TABLE, REPAIR TABLE */ #define MI_NAME_IEXT ".MYI" #define MI_NAME_DEXT ".MYD" @@ -56,6 +68,63 @@ extern "C" { #define mi_portable_sizeof_char_ptr 8 +/* + In the following macros '_keyno_' is 0 .. keys-1. + If there can be more keys than bits in the key_map, the highest bit + is for all upper keys. They cannot be switched individually. + This means that clearing of high keys is ignored, setting one high key + sets all high keys. +*/ +#define MI_KEYMAP_BITS (8 * SIZEOF_LONG_LONG) +#define MI_KEYMAP_HIGH_MASK (ULL(1) << (MI_KEYMAP_BITS - 1)) +#define mi_get_mask_all_keys_active(_keys_) \ + (((_keys_) < MI_KEYMAP_BITS) ? \ + ((ULL(1) << (_keys_)) - ULL(1)) : \ + (~ ULL(0))) + +#if MI_MAX_KEY > MI_KEYMAP_BITS + +#define mi_is_key_active(_keymap_,_keyno_) \ + (((_keyno_) < MI_KEYMAP_BITS) ? \ + test((_keymap_) & (ULL(1) << (_keyno_))) : \ + test((_keymap_) & MI_KEYMAP_HIGH_MASK)) +#define mi_set_key_active(_keymap_,_keyno_) \ + (_keymap_)|= (((_keyno_) < MI_KEYMAP_BITS) ? \ + (ULL(1) << (_keyno_)) : \ + MI_KEYMAP_HIGH_MASK) +#define mi_clear_key_active(_keymap_,_keyno_) \ + (_keymap_)&= (((_keyno_) < MI_KEYMAP_BITS) ? \ + (~ (ULL(1) << (_keyno_))) : \ + (~ (ULL(0))) /*ignore*/ ) + +#else + +#define mi_is_key_active(_keymap_,_keyno_) \ + test((_keymap_) & (ULL(1) << (_keyno_))) +#define mi_set_key_active(_keymap_,_keyno_) \ + (_keymap_)|= (ULL(1) << (_keyno_)) +#define mi_clear_key_active(_keymap_,_keyno_) \ + (_keymap_)&= (~ (ULL(1) << (_keyno_))) + +#endif + +#define mi_is_any_key_active(_keymap_) \ + test((_keymap_)) +#define mi_is_all_keys_active(_keymap_,_keys_) \ + ((_keymap_) == mi_get_mask_all_keys_active(_keys_)) +#define mi_set_all_keys_active(_keymap_,_keys_) \ + (_keymap_)= mi_get_mask_all_keys_active(_keys_) +#define mi_clear_all_keys_active(_keymap_) \ + (_keymap_)= 0 +#define mi_intersect_keys_active(_to_,_from_) \ + (_to_)&= (_from_) +#define mi_is_any_intersect_keys_active(_keymap1_,_keys_,_keymap2_) \ + ((_keymap1_) & (_keymap2_) & \ + mi_get_mask_all_keys_active(_keys_)) +#define mi_copy_keys_active(_to_,_maxkeys_,_from_) \ + (_to_)= (mi_get_mask_all_keys_active(_maxkeys_) & \ + (_from_)) + /* Param to/from mi_info */ typedef struct st_mi_isaminfo /* Struct from h_info */ |