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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* Functions to handle keys */
#include "isamdef.h"
#include "m_ctype.h"
static void _nisam_put_key_in_record(N_INFO *info,uint keynr,byte *record);
/* Make a intern key from a record */
/* If ascii key convert according to sortorder */
/* Ret: Length of key */
uint _nisam_make_key(register N_INFO *info, uint keynr, uchar *key, const char *record, ulong filepos)
{
uint length;
byte *pos,*end;
uchar *start;
reg1 N_KEYSEG *keyseg;
enum ha_base_keytype type;
DBUG_ENTER("_nisam_make_key");
start=key;
for (keyseg=info->s->keyinfo[keynr].seg ; keyseg->base.type ;keyseg++)
{
type=(enum ha_base_keytype) keyseg->base.type;
if (keyseg->base.flag & HA_SPACE_PACK)
{
pos= (byte*) record+keyseg->base.start; end=pos+keyseg->base.length;
if (type != HA_KEYTYPE_NUM)
{
while (end > pos && end[-1] == ' ')
end--;
}
else
{
while (pos < end && pos[0] == ' ')
pos++;
}
*key++= (uchar) (length=(uint) (end-pos));
memcpy((byte*) key,(byte*) pos,(size_t) length);
if (!use_strnxfrm(default_charset_info))
{
if (type == HA_KEYTYPE_TEXT)
my_tosort(default_charset_info,(byte*) key,length);
}
key+=length;
}
else
{
memcpy((byte*) key,(byte*) record+keyseg->base.start,
(size_t) keyseg->base.length);
if (!use_strnxfrm(default_charset_info))
{
if (type == HA_KEYTYPE_TEXT)
my_tosort(default_charset_info,(byte*) key,(uint) keyseg->base.length);
}
#ifdef NAN_TEST
else if (type == HA_KEYTYPE_FLOAT)
{
float nr;
bmove((byte*) &nr,(byte*) key,sizeof(float));
if (nr == (float) FLT_MAX)
{
nr= (float) FLT_MAX;
bmove((byte*) key,(byte*) &nr,sizeof(float));
}
}
else if (type == HA_KEYTYPE_DOUBLE)
{
double nr;
bmove((byte*) &nr,(byte*) key,sizeof(double));
if (nr == DBL_MAX)
{
nr=DBL_MAX;
bmove((byte*) key,(byte*) &nr,sizeof(double));
}
}
#endif
key+= keyseg->base.length;
}
}
_nisam_dpointer(info,key,filepos);
DBUG_PRINT("exit",("keynr: %d",keynr));
DBUG_DUMP("key",(byte*) start,(uint) (key-start)+keyseg->base.length);
DBUG_EXECUTE("key",_nisam_print_key(DBUG_FILE,info->s->keyinfo[keynr].seg,start););
DBUG_RETURN((uint) (key-start)); /* Return keylength */
} /* _nisam_make_key */
/* Pack a key to intern format from given format (c_rkey) */
/* if key_length is set returns new length of key */
uint _nisam_pack_key(register N_INFO *info, uint keynr, uchar *key, uchar *old, uint key_length)
/* Length of used key */
{
int k_length;
uint length;
uchar *pos,*end;
reg1 N_KEYSEG *keyseg;
enum ha_base_keytype type;
DBUG_ENTER("_nisam_pack_key");
if ((k_length=(int) key_length) <= 0)
k_length=N_MAX_KEY_BUFF;
for (keyseg=info->s->keyinfo[keynr].seg ;
keyseg->base.type && k_length >0;
k_length-=keyseg->base.length, old+=keyseg->base.length, keyseg++)
{
length=min((uint) keyseg->base.length,(uint) k_length);
type=(enum ha_base_keytype) keyseg->base.type;
if (keyseg->base.flag & HA_SPACE_PACK)
{
pos=old; end=pos+length;
if (type != HA_KEYTYPE_NUM)
{
while (end > pos && end[-1] == ' ')
end--;
}
else
{
while (pos < end && pos[0] == ' ')
pos++;
}
*key++ = (uchar) (length=(uint) (end-pos));
memcpy((byte*) key,pos,(size_t) length);
}
else
memcpy((byte*) key,old,(size_t) length);
if (!use_strnxfrm(default_charset_info))
{
if (type == HA_KEYTYPE_TEXT)
my_tosort(default_charset_info,(byte*) key,length);
}
key+= length;
}
if (!keyseg->base.type)
{
if (k_length >= 0) /* Hole key */
key_length=0;
}
else
{ /* Part-key ; fill with null */
length= (uint) -k_length; /* unused part of last key */
do
{
length+= (keyseg->base.flag & HA_SPACE_PACK) ? 1 :
keyseg->base.length;
keyseg++;
} while (keyseg->base.type);
bzero((byte*) key,length);
}
DBUG_RETURN(key_length); /* Return part-keylength */
} /* _nisam_pack_key */
/* Put a key in record */
/* Used when only-keyread is wanted */
static void _nisam_put_key_in_record(register N_INFO *info, uint keynr, byte *record)
{
uint length;
reg2 byte *key;
byte *pos;
reg1 N_KEYSEG *keyseg;
DBUG_ENTER("_nisam_put_key_in_record");
key=(byte*) info->lastkey;
for (keyseg=info->s->keyinfo[keynr].seg ; keyseg->base.type ;keyseg++)
{
if (keyseg->base.flag & HA_SPACE_PACK)
{
length= (uint) (uchar) *key++;
pos= record+keyseg->base.start;
if (keyseg->base.type != (int) HA_KEYTYPE_NUM)
{
memcpy(pos,key,(size_t) length);
bfill(pos+length,keyseg->base.length-length,' ');
}
else
{
bfill(pos,keyseg->base.length-length,' ');
memcpy(pos+keyseg->base.length-length,key,(size_t) length);
}
key+=length;
}
else
{
memcpy(record+keyseg->base.start,(byte*) key,
(size_t) keyseg->base.length);
key+= keyseg->base.length;
}
}
DBUG_VOID_RETURN;
} /* _nisam_put_key_in_record */
/* Here when key reads are used */
int _nisam_read_key_record(N_INFO *info, ulong filepos, byte *buf)
{
VOID(_nisam_writeinfo(info,0));
if (filepos != NI_POS_ERROR)
{
if (info->lastinx >= 0)
{ /* Read only key */
_nisam_put_key_in_record(info,(uint) info->lastinx,buf);
info->update|= HA_STATE_AKTIV; /* We should find a record */
return 0;
}
my_errno=HA_ERR_WRONG_INDEX;
return(-1);
}
return(-1); /* Wrong data to read */
}
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