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/* Copyright (C) 2000-2002, 2004-2006 MySQL 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; version 2 of the License.
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 fixed-length-records */
#include "myisam_priv.h"
using namespace drizzled;
int _mi_write_static_record(MI_INFO *info, const unsigned char *record)
{
unsigned char temp[8]; /* max pointer length */
if (info->s->state.dellink != HA_OFFSET_ERROR &&
!info->append_insert_at_end)
{
internal::my_off_t filepos=info->s->state.dellink;
info->rec_cache.seek_not_done=1; /* We have done a seek */
if (info->s->file_read(info, &temp[0],info->s->base.rec_reflength,
info->s->state.dellink+1,
MYF(MY_NABP)))
goto err;
info->s->state.dellink= _mi_rec_pos(info->s,temp);
info->state->del--;
info->state->empty-=info->s->base.pack_reclength;
if (info->s->file_write(info, record, info->s->base.reclength,
filepos,
MYF(MY_NABP)))
goto err;
}
else
{
if (info->state->data_file_length > info->s->base.max_data_file_length-
info->s->base.pack_reclength)
{
errno=HA_ERR_RECORD_FILE_FULL;
return(2);
}
if (info->opt_flag & WRITE_CACHE_USED)
{ /* Cash in use */
if (my_b_write(&info->rec_cache, record,
info->s->base.reclength))
goto err;
if (info->s->base.pack_reclength != info->s->base.reclength)
{
uint32_t length=info->s->base.pack_reclength - info->s->base.reclength;
memset(temp, 0, length);
if (my_b_write(&info->rec_cache, temp,length))
goto err;
}
}
else
{
info->rec_cache.seek_not_done=1; /* We have done a seek */
if (info->s->file_write(info, record, info->s->base.reclength,
info->state->data_file_length,
info->s->write_flag))
goto err;
if (info->s->base.pack_reclength != info->s->base.reclength)
{
uint32_t length=info->s->base.pack_reclength - info->s->base.reclength;
memset(temp, 0, length);
if (info->s->file_write(info, temp,length,
info->state->data_file_length+
info->s->base.reclength,
info->s->write_flag))
goto err;
}
}
info->state->data_file_length+=info->s->base.pack_reclength;
info->s->state.split++;
}
return 0;
err:
return 1;
}
int _mi_update_static_record(MI_INFO *info, internal::my_off_t pos, const unsigned char *record)
{
info->rec_cache.seek_not_done=1; /* We have done a seek */
return (info->s->file_write(info,
record, info->s->base.reclength,
pos,
MYF(MY_NABP)) != 0);
}
int _mi_delete_static_record(MI_INFO *info)
{
unsigned char temp[9]; /* 1+sizeof(uint32) */
info->state->del++;
info->state->empty+=info->s->base.pack_reclength;
temp[0]= '\0'; /* Mark that record is deleted */
_mi_dpointer(info,temp+1,info->s->state.dellink);
info->s->state.dellink = info->lastpos;
info->rec_cache.seek_not_done=1;
return (info->s->file_write(info,(unsigned char*) temp, 1+info->s->rec_reflength,
info->lastpos, MYF(MY_NABP)) != 0);
}
int _mi_cmp_static_record(register MI_INFO *info, register const unsigned char *old)
{
if (info->opt_flag & WRITE_CACHE_USED)
{
if (flush_io_cache(&info->rec_cache))
{
return(-1);
}
info->rec_cache.seek_not_done=1; /* We have done a seek */
}
if ((info->opt_flag & READ_CHECK_USED))
{ /* If check isn't disabled */
info->rec_cache.seek_not_done=1; /* We have done a seek */
if (info->s->file_read(info, info->rec_buff, info->s->base.reclength,
info->lastpos,
MYF(MY_NABP)))
return(-1);
if (memcmp(info->rec_buff, old,
(uint) info->s->base.reclength))
{
errno=HA_ERR_RECORD_CHANGED; /* Record have changed */
return(1);
}
}
return(0);
}
int _mi_cmp_static_unique(MI_INFO *info, MI_UNIQUEDEF *def,
const unsigned char *record, internal::my_off_t pos)
{
info->rec_cache.seek_not_done=1; /* We have done a seek */
if (info->s->file_read(info, info->rec_buff, info->s->base.reclength,
pos, MYF(MY_NABP)))
return(-1);
return(mi_unique_comp(def, record, info->rec_buff,
def->null_are_equal));
}
/* Read a fixed-length-record */
/* Returns 0 if Ok. */
/* 1 if record is deleted */
/* MY_FILE_ERROR on read-error or locking-error */
int _mi_read_static_record(register MI_INFO *info, register internal::my_off_t pos,
register unsigned char *record)
{
int error;
if (pos != HA_OFFSET_ERROR)
{
if (info->opt_flag & WRITE_CACHE_USED &&
info->rec_cache.pos_in_file <= pos &&
flush_io_cache(&info->rec_cache))
return(-1);
info->rec_cache.seek_not_done=1; /* We have done a seek */
error=info->s->file_read(info, record, info->s->base.reclength,
pos,MYF(MY_NABP)) != 0;
fast_mi_writeinfo(info);
if (! error)
{
if (!*record)
{
errno=HA_ERR_RECORD_DELETED;
return(1); /* Record is deleted */
}
info->update|= HA_STATE_AKTIV; /* Record is read */
return(0);
}
return(-1); /* Error on read */
}
fast_mi_writeinfo(info); /* No such record */
return(-1);
}
int _mi_read_rnd_static_record(MI_INFO *info, unsigned char *buf,
register internal::my_off_t filepos,
bool skip_deleted_blocks)
{
int locked,error,cache_read;
uint32_t cache_length;
MYISAM_SHARE *share=info->s;
cache_read=0;
cache_length=0;
if (info->opt_flag & WRITE_CACHE_USED &&
(info->rec_cache.pos_in_file <= filepos || skip_deleted_blocks) &&
flush_io_cache(&info->rec_cache))
return(errno);
if (info->opt_flag & READ_CACHE_USED)
{ /* Cache in use */
if (filepos == my_b_tell(&info->rec_cache) &&
(skip_deleted_blocks || !filepos))
{
cache_read=1; /* Read record using cache */
cache_length=(uint) (info->rec_cache.read_end - info->rec_cache.read_pos);
}
else
info->rec_cache.seek_not_done=1; /* Filepos is changed */
}
locked=0;
if (info->lock_type == F_UNLCK)
{
if (filepos >= info->state->data_file_length)
{ /* Test if new records */
if (_mi_readinfo(info,F_RDLCK,0))
return(errno);
locked=1;
}
else
{ /* We don't nead new info */
#ifndef UNSAFE_LOCKING
locked=1;
#else
info->tmp_lock_type=F_RDLCK;
#endif
}
}
if (filepos >= info->state->data_file_length)
{
fast_mi_writeinfo(info);
return(errno=HA_ERR_END_OF_FILE);
}
info->lastpos= filepos;
info->nextpos= filepos+share->base.pack_reclength;
if (! cache_read) /* No cacheing */
{
if ((error=_mi_read_static_record(info,filepos,buf)))
{
if (error > 0)
error=errno=HA_ERR_RECORD_DELETED;
else
error=errno;
}
return(error);
}
/* Read record with cacheing */
error=my_b_read(&info->rec_cache,(unsigned char*) buf,share->base.reclength);
if (info->s->base.pack_reclength != info->s->base.reclength && !error)
{
char tmp[8]; /* Skill fill bytes */
error=my_b_read(&info->rec_cache,(unsigned char*) tmp,
info->s->base.pack_reclength - info->s->base.reclength);
}
if (locked)
_mi_writeinfo(info,0); /* Unlock keyfile */
if (!error)
{
if (!buf[0])
{ /* Record is removed */
return(errno=HA_ERR_RECORD_DELETED);
}
/* Found and may be updated */
info->update|= HA_STATE_AKTIV | HA_STATE_KEY_CHANGED;
return(0);
}
/* errno should be set if rec_cache.error == -1 */
if (info->rec_cache.error != -1 || errno == 0)
errno=HA_ERR_WRONG_IN_RECORD;
return(errno); /* Something wrong (EOF?) */
}
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