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124 lines
4.3 KiB
C
124 lines
4.3 KiB
C
/* Copyright (c) Monty Program Ab; 1991-2011
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Copyright (C) 2002-2006 MySQL AB
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Copyright (c) 2011, Oracle and/or its affiliates.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifndef _my_compare_h
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#define _my_compare_h
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#include "myisampack.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct st_HA_KEYSEG /* Key-portion */
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{
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CHARSET_INFO *charset;
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uint32 start; /* Start of key in record */
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uint32 null_pos; /* position to NULL indicator */
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uint16 bit_pos; /* Position to bit part */
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uint16 flag;
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uint16 length; /* Keylength */
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uint8 type; /* Type of key (for sort) */
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uint8 language;
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uint8 null_bit; /* bitmask to test for NULL */
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uint8 bit_start,bit_end; /* if bit field */
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uint8 bit_length; /* Length of bit part */
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} HA_KEYSEG;
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#define get_key_length(length,key) \
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{ if (*(const uchar*) (key) != 255) \
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length= (uint) *(const uchar*) ((key)++); \
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else \
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{ length= mi_uint2korr((key)+1); (key)+=3; } \
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}
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#define get_key_length_rdonly(length,key) \
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{ if (*(const uchar*) (key) != 255) \
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length= ((uint) *(const uchar*) ((key))); \
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else \
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{ length= mi_uint2korr((key)+1); } \
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}
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#define get_key_pack_length(length,length_pack,key) \
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{ if (*(const uchar*) (key) != 255) \
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{ length= (uint) *(const uchar*) ((key)++); length_pack= 1; }\
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else \
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{ length=mi_uint2korr((key)+1); (key)+= 3; length_pack= 3; } \
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}
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#define store_key_length_inc(key,length) \
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{ if ((length) < 255) \
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{ *(key)++= (length); } \
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else \
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{ *(key)=255; mi_int2store((key)+1,(length)); (key)+=3; } \
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}
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#define size_to_store_key_length(length) ((length) < 255 ? 1 : 3)
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#define get_rec_bits(bit_ptr, bit_ofs, bit_len) \
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(((((uint16) (bit_ptr)[1] << 8) | (uint16) (bit_ptr)[0]) >> (bit_ofs)) & \
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((1 << (bit_len)) - 1))
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#define set_rec_bits(bits, bit_ptr, bit_ofs, bit_len) \
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{ \
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(bit_ptr)[0]= ((bit_ptr)[0] & ~(((1 << (bit_len)) - 1) << (bit_ofs))) | \
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((bits) << (bit_ofs)); \
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if ((bit_ofs) + (bit_len) > 8) \
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(bit_ptr)[1]= ((bit_ptr)[1] & ~((1 << ((bit_len) - 8 + (bit_ofs))) - 1)) | \
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((bits) >> (8 - (bit_ofs))); \
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}
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#define clr_rec_bits(bit_ptr, bit_ofs, bit_len) \
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set_rec_bits(0, bit_ptr, bit_ofs, bit_len)
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extern int ha_compare_text(CHARSET_INFO *, const uchar *, uint,
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const uchar *, uint , my_bool, my_bool);
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extern int ha_key_cmp(register HA_KEYSEG *keyseg, register const uchar *a,
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register const uchar *b, uint key_length,
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uint32 nextflag, uint *diff_pos);
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extern HA_KEYSEG *ha_find_null(HA_KEYSEG *keyseg, const uchar *a);
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/**
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Return values of index_cond_func_xxx functions.
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0=ICP_NO_MATCH - index tuple doesn't satisfy the pushed index condition (the
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engine should discard the tuple and go to the next one)
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1=ICP_MATCH - index tuple satisfies the pushed index condition (the
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engine should fetch and return the record)
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2=ICP_OUT_OF_RANGE - index tuple is out range that we're scanning, e.g. this
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if we're scanning "t.key BETWEEN 10 AND 20" and got a
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"t.key=21" tuple (the engine should stop scanning and
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return HA_ERR_END_OF_FILE right away).
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3=ICP_ABORTED_BY_USER - engine must stop scanning and should return
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HA_ERR_ABORTED_BY_USER right away
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-1= ICP_ERROR - Reserved for internal errors in engines. Should not be
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returned by index_cond_func_xxx
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*/
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typedef enum icp_result {
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ICP_ERROR=-1,
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ICP_NO_MATCH=0,
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ICP_MATCH=1,
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ICP_OUT_OF_RANGE=2,
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ICP_ABORTED_BY_USER=3,
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} ICP_RESULT;
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#ifdef __cplusplus
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}
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#endif
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#endif /* _my_compare_h */
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