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Diffstat (limited to 'dep/mysqllite/include/my_handler.h')
| -rw-r--r-- | dep/mysqllite/include/my_handler.h | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/dep/mysqllite/include/my_handler.h b/dep/mysqllite/include/my_handler.h new file mode 100644 index 00000000000..a3376cb74a2 --- /dev/null +++ b/dep/mysqllite/include/my_handler.h @@ -0,0 +1,128 @@ +/* Copyright (C) 2002-2006 MySQL AB + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public + License as published by the Free Software Foundation; version 2 + of the License. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with this library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, + MA 02111-1307, USA */ + +#ifndef _my_handler_h +#define _my_handler_h + +#include "myisampack.h" +#ifdef __cplusplus +extern "C" { +#endif + +/* + 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 + HA_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 HA_MAX_POSSIBLE_KEY 255 /* For myisamchk */ +/* + The following defines can be increased if necessary. + But beware the dependency of MI_MAX_POSSIBLE_KEY_BUFF and HA_MAX_KEY_LENGTH. +*/ + +#define HA_MAX_KEY_LENGTH 1000 /* Max length in bytes */ +#define HA_MAX_KEY_SEG 16 /* Max segments for key */ + +#define HA_MAX_POSSIBLE_KEY_BUFF (HA_MAX_KEY_LENGTH + 24+ 6+6) +#define HA_MAX_KEY_BUFF (HA_MAX_KEY_LENGTH+HA_MAX_KEY_SEG*6+8+8) + +typedef struct st_HA_KEYSEG /* Key-portion */ +{ + CHARSET_INFO *charset; + uint32 start; /* Start of key in record */ + uint32 null_pos; /* position to NULL indicator */ + uint16 bit_pos; /* Position to bit part */ + uint16 flag; + uint16 length; /* Keylength */ + uint8 type; /* Type of key (for sort) */ + uint8 language; + uint8 null_bit; /* bitmask to test for NULL */ + uint8 bit_start,bit_end; /* if bit field */ + uint8 bit_length; /* Length of bit part */ +} HA_KEYSEG; + +#define get_key_length(length,key) \ +{ if (*(uchar*) (key) != 255) \ + length= (uint) *(uchar*) ((key)++); \ + else \ + { length= mi_uint2korr((key)+1); (key)+=3; } \ +} + +#define get_key_length_rdonly(length,key) \ +{ if (*(uchar*) (key) != 255) \ + length= ((uint) *(uchar*) ((key))); \ + else \ + { length= mi_uint2korr((key)+1); } \ +} + +#define get_key_pack_length(length,length_pack,key) \ +{ if (*(uchar*) (key) != 255) \ + { length= (uint) *(uchar*) ((key)++); length_pack= 1; }\ + else \ + { length=mi_uint2korr((key)+1); (key)+= 3; length_pack= 3; } \ +} + +#define store_key_length_inc(key,length) \ +{ if ((length) < 255) \ + { *(key)++= (length); } \ + else \ + { *(key)=255; mi_int2store((key)+1,(length)); (key)+=3; } \ +} + +#define size_to_store_key_length(length) ((length) < 255 ? 1 : 3) + +#define get_rec_bits(bit_ptr, bit_ofs, bit_len) \ + (((((uint16) (bit_ptr)[1] << 8) | (uint16) (bit_ptr)[0]) >> (bit_ofs)) & \ + ((1 << (bit_len)) - 1)) + +#define set_rec_bits(bits, bit_ptr, bit_ofs, bit_len) \ +{ \ + (bit_ptr)[0]= ((bit_ptr)[0] & ~(((1 << (bit_len)) - 1) << (bit_ofs))) | \ + ((bits) << (bit_ofs)); \ + if ((bit_ofs) + (bit_len) > 8) \ + (bit_ptr)[1]= ((bit_ptr)[1] & ~((1 << ((bit_len) - 8 + (bit_ofs))) - 1)) | \ + ((bits) >> (8 - (bit_ofs))); \ +} + +#define clr_rec_bits(bit_ptr, bit_ofs, bit_len) \ + set_rec_bits(0, bit_ptr, bit_ofs, bit_len) + +extern int ha_compare_text(CHARSET_INFO *, uchar *, uint, uchar *, uint , + my_bool, my_bool); +extern int ha_key_cmp(register HA_KEYSEG *keyseg, register uchar *a, + register uchar *b, uint key_length, uint nextflag, + uint *diff_pos); + +extern HA_KEYSEG *ha_find_null(HA_KEYSEG *keyseg, uchar *a); +extern void my_handler_error_register(void); +extern void my_handler_error_unregister(void); +/* + Inside an in-memory data record, memory pointers to pieces of the + record (like BLOBs) are stored in their native byte order and in + this amount of bytes. +*/ +#define portable_sizeof_char_ptr 8 +#ifdef __cplusplus +} +#endif + +#endif /* _my_handler_h */ |