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src/libmysql_std/include/my_handler.h
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00001 /* Copyright (C) 2002-2006 MySQL AB
00002 
00003    This library is free software; you can redistribute it and/or
00004    modify it under the terms of the GNU Library General Public
00005    License as published by the Free Software Foundation; version 2
00006    of the License.
00007 
00008    This library is distributed in the hope that it will be useful,
00009    but WITHOUT ANY WARRANTY; without even the implied warranty of
00010    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00011    Library General Public License for more details.
00012 
00013    You should have received a copy of the GNU Library General Public
00014    License along with this library; if not, write to the Free
00015    Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
00016    MA 02111-1307, USA */
00017 
00018 #ifndef _my_handler_h
00019 #define _my_handler_h
00020 
00021 #include "my_base.h"
00022 #include "m_ctype.h"
00023 #include "myisampack.h"
00024 
00025 typedef struct st_HA_KEYSEG             /* Key-portion */
00026 {
00027   CHARSET_INFO *charset;
00028   uint32 start;                         /* Start of key in record */
00029   uint32 null_pos;                      /* position to NULL indicator */
00030   uint16 bit_pos;                       /* Position to bit part */
00031   uint16 flag;
00032   uint16 length;                        /* Keylength */
00033   uint8  type;                          /* Type of key (for sort) */
00034   uint8  language;
00035   uint8  null_bit;                      /* bitmask to test for NULL */
00036   uint8  bit_start,bit_end;             /* if bit field */
00037   uint8  bit_length;                    /* Length of bit part */
00038 } HA_KEYSEG;
00039 
00040 #define get_key_length(length,key) \
00041 { if ((uchar) *(key) != 255) \
00042     length= (uint) (uchar) *((key)++); \
00043   else \
00044   { length=mi_uint2korr((key)+1); (key)+=3; } \
00045 }
00046 
00047 #define get_key_length_rdonly(length,key) \
00048 { if ((uchar) *(key) != 255) \
00049     length= ((uint) (uchar) *((key))); \
00050   else \
00051   { length=mi_uint2korr((key)+1); } \
00052 }
00053 
00054 #define get_key_pack_length(length,length_pack,key) \
00055 { if ((uchar) *(key) != 255) \
00056   { length= (uint) (uchar) *((key)++); length_pack=1; }\
00057   else \
00058   { length=mi_uint2korr((key)+1); (key)+=3; length_pack=3; } \
00059 }
00060 
00061 #define store_key_length_inc(key,length) \
00062 { if ((length) < 255) \
00063   { *(key)++=(length); } \
00064   else \
00065   { *(key)=255; mi_int2store((key)+1,(length)); (key)+=3; } \
00066 }
00067 
00068 #define get_rec_bits(bit_ptr, bit_ofs, bit_len) \
00069   (((((uint16) (bit_ptr)[1] << 8) | (uint16) (bit_ptr)[0]) >> (bit_ofs)) & \
00070    ((1 << (bit_len)) - 1))
00071 
00072 #define set_rec_bits(bits, bit_ptr, bit_ofs, bit_len) \
00073 { \
00074   (bit_ptr)[0]= ((bit_ptr)[0] & ~(((1 << (bit_len)) - 1) << (bit_ofs))) | \
00075                 ((bits) << (bit_ofs)); \
00076   if ((bit_ofs) + (bit_len) > 8) \
00077     (bit_ptr)[1]= ((bit_ptr)[1] & ~((1 << ((bit_len) - 8 + (bit_ofs))) - 1)) | \
00078                   ((bits) >> (8 - (bit_ofs))); \
00079 }
00080 
00081 #define clr_rec_bits(bit_ptr, bit_ofs, bit_len) \
00082   set_rec_bits(0, bit_ptr, bit_ofs, bit_len)
00083 
00084 extern int mi_compare_text(CHARSET_INFO *, uchar *, uint, uchar *, uint ,
00085                            my_bool, my_bool);
00086 extern int ha_key_cmp(register HA_KEYSEG *keyseg, register uchar *a,
00087                       register uchar *b, uint key_length, uint nextflag,
00088                       uint *diff_pos);
00089 
00090 extern HA_KEYSEG *ha_find_null(HA_KEYSEG *keyseg, uchar *a);
00091 
00092 #endif /* _my_handler_h */
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