my_compare.h File Reference

#include <sys/types.h>
#include "m_ctype.h"
#include "my_inttypes.h"
#include "myisampack.h"

Go to the source code of this file.

Classes
struct	HA_KEYSEG

Macros
#define	HA_MAX_POSSIBLE_KEY   255 /* For myisamchk */
#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)
#define	store_key_length_inc(key, length)
#define	size_to_store_key_length(length)   ((length) < 255 ? 1 : 3)
#define	get_rec_bits(bit_ptr, bit_ofs, bit_len)
#define	set_rec_bits(bits, bit_ptr, bit_ofs, bit_len)
#define	clr_rec_bits(bit_ptr, bit_ofs, bit_len)    set_rec_bits(0, bit_ptr, bit_ofs, bit_len)

Functions
static uint	get_key_length (const uchar **key)
static uint	get_key_pack_length (const uchar **key, uint *length_pack)
int	ha_compare_text (const CHARSET_INFO *, const uchar *, uint, const uchar *, uint, bool)
int	ha_key_cmp (const HA_KEYSEG *keyseg, const uchar *a, const uchar *b, uint key_length, uint nextflag, uint *diff_pos)
template<class T >
int	compare_numbers (T val1, T val2)
	Compare two numbers of the same type. More...

Macro Definition Documentation

clr_rec_bits

#define clr_rec_bits	(		bit_ptr,
			bit_ofs,
			bit_len
	)		set_rec_bits(0, bit_ptr, bit_ofs, bit_len)

get_rec_bits

#define get_rec_bits	(		bit_ptr,
			bit_ofs,
			bit_len
	)

Value:

  (((((uint16)(bit_ptr)[1] << 8) | (uint16)(bit_ptr)[0]) >> (bit_ofs)) & \
   ((1 << (bit_len)) - 1))

HA_MAX_KEY_BUFF

#define HA_MAX_KEY_BUFF   (HA_MAX_KEY_LENGTH + HA_MAX_KEY_SEG * 6 + 8 + 8)

HA_MAX_KEY_LENGTH

#define HA_MAX_KEY_LENGTH   1000 /* Max length in bytes */

HA_MAX_KEY_SEG

#define HA_MAX_KEY_SEG   16 /* Max segments for key */

HA_MAX_POSSIBLE_KEY

#define HA_MAX_POSSIBLE_KEY   255 /* For myisamchk */

HA_MAX_POSSIBLE_KEY_BUFF

#define HA_MAX_POSSIBLE_KEY_BUFF   (HA_MAX_KEY_LENGTH + 24 + 6 + 6)

set_rec_bits

#define set_rec_bits	(		bits,
			bit_ptr,
			bit_ofs,
			bit_len
	)

Value:

  {                                                                          \
    (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)));                                       \
  }

size_to_store_key_length

#define size_to_store_key_length

(

length

)

((length) < 255 ? 1 : 3)

store_key_length_inc

#define store_key_length_inc	(		key,
			length
	)

Value:

  {                                       \
    if ((length) < 255) {                 \
      *(key)++ = (length);                \
    } else {                              \
      *(key) = 255;                       \
      mi_int2store((key) + 1, (length));  \
      (key) += 3;                         \
    }                                     \
  }

Function Documentation

compare_numbers()

template<class T >

int compare_numbers	(	T	val1,
		T	val2
	)

Compare two numbers of the same type.

Parameters

val1	the first number
val2	the second number

Return values

-1	if val1 is less than val2,
0	if val1 is equal to val2,
1	if val1 is greater than val2

get_key_length()

static uint get_key_length ( const uchar **  key )

inlinestatic

get_key_pack_length()

static uint get_key_pack_length ( const uchar **  key, uint *  length_pack  )

inlinestatic

ha_compare_text()

int ha_compare_text	(	const CHARSET_INFO *	charset_info,
		const uchar *	a,
		uint	a_length,
		const uchar *	b,
		uint	b_length,
		bool	part_key
	)

ha_key_cmp()

int ha_key_cmp	(	const HA_KEYSEG *	keyseg,
		const uchar *	a,
		const uchar *	b,
		uint	key_length,
		uint	nextflag,
		uint *	diff_pos
	)