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/* 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 "my_base.h"
#include "m_ctype.h"
#include "myisampack.h"
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 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 mi_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);
#endif /* _my_handler_h */
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