mariadb/myisam/mi_check.c

/* 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 */

/* Descript, check and repair of ISAM tables */

#include "fulltext.h"
#include <m_ctype.h>
#include <stdarg.h>
#include <getopt.h>
#include <assert.h>
#ifdef HAVE_SYS_VADVICE_H
#include <sys/vadvise.h>
#endif
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif

#ifndef USE_RAID
#define my_raid_create(A,B,C,D,E,F,G) my_create(A,B,C,G)
#define my_raid_delete(A,B,C) my_delete(A,B)
#endif

	/* Functions defined in this file */

static int check_k_link(MI_CHECK *param, MI_INFO *info,uint nr);
static int chk_index(MI_CHECK *param, MI_INFO *info, MI_KEYDEF *keyinfo,
		     my_off_t page, uchar *buff, ha_rows *keys,
		     ha_checksum *key_checksum, uint level);
static uint isam_key_length(MI_INFO *info,MI_KEYDEF *keyinfo);
static ha_checksum calc_checksum(ha_rows count);
static int writekeys(MI_INFO *info,byte *buff,my_off_t filepos);
static int sort_one_index(MI_CHECK *param, MI_INFO *info,MI_KEYDEF *keyinfo,
			  my_off_t pagepos, File new_file);
static int sort_key_read(SORT_INFO *sort_info,void *key);
static int sort_get_next_record(SORT_INFO *sort_info);
static int sort_key_cmp(SORT_INFO *sort_info, const void *a,const void *b);
static int sort_key_write(SORT_INFO *sort_info, const void *a);
static my_off_t get_record_for_key(MI_INFO *info,MI_KEYDEF *keyinfo,
				uchar *key);
static int sort_insert_key(MI_CHECK *param, reg1 SORT_KEY_BLOCKS *key_block,
			   uchar *key, my_off_t prev_block);
static int sort_delete_record(MI_CHECK *param);
static int flush_pending_blocks(MI_CHECK *param);
static SORT_KEY_BLOCKS	*alloc_key_blocks(MI_CHECK *param, uint blocks,
					  uint buffer_length);
static void update_key_parts(MI_KEYDEF *keyinfo,
			     ulong *rec_per_key_part,
			     ulonglong *unique,
			     ulonglong records);
static ha_checksum mi_byte_checksum(const byte *buf, uint length);


#ifdef __WIN__
static double ulonglong2double(ulonglong value)
{
  longlong nr=(longlong) value;
  if (nr >= 0)
    return (double) nr;
  return (18446744073709551616.0 + (double) nr);
}

#if SIZEOF_OFF_T > 4
#define my_off_t2double(A) ulonglong2double(A)
#else
#define my_off_t2double(A) ((double) (A))
#endif /* SIZEOF_OFF_T > 4 */
#endif

void myisamchk_init(MI_CHECK *param)
{
  bzero((gptr) param,sizeof(*param));
  param->opt_follow_links=1;
  param->keys_in_use= ~(ulonglong) 0;
  param->search_after_block=HA_OFFSET_ERROR;
  param->auto_increment_value= 0;
  param->use_buffers=USE_BUFFER_INIT;
  param->read_buffer_length=READ_BUFFER_INIT;
  param->write_buffer_length=READ_BUFFER_INIT;
  param->sort_buffer_length=SORT_BUFFER_INIT;
  param->sort_key_blocks=BUFFERS_WHEN_SORTING;
  param->tmpfile_createflag=O_RDWR | O_TRUNC | O_EXCL;
  param->myf_rw=MYF(MY_NABP | MY_WME | MY_WAIT_IF_FULL);
  param->sort_info.param=param;
  param->start_check_pos=0;
}

	/* Check delete links */

int chk_del(MI_CHECK *param, register MI_INFO *info, uint test_flag)
{
  reg2 ha_rows i;
  uint j,delete_link_length;
  my_off_t empty,next_link,old_link;
  char buff[22],buff2[22];
  DBUG_ENTER("chk_del");

  if (!(test_flag & T_SILENT))
    puts("- check key delete-chain");

  LINT_INIT(old_link);
  param->record_checksum=0;
  param->key_file_blocks=info->s->base.keystart;
  for (j=0 ; j < info->s->state.header.max_block_size ; j++)
    if (check_k_link(param,info,j))
      goto wrong;
  delete_link_length=((info->s->options & HA_OPTION_PACK_RECORD) ? 20 :
		      info->s->rec_reflength+1);

  if (!(test_flag & T_SILENT))
    puts("- check record delete-chain");

  next_link=info->s->state.dellink;
  if (info->state->del == 0)
  {
    if (test_flag & T_VERBOSE)
    {
      puts("No recordlinks");
    }
  }
  else
  {
    if (test_flag & T_VERBOSE)
      printf("Recordlinks:    ");
    empty=0;
    for (i= info->state->del ; i > 0L && next_link != HA_OFFSET_ERROR ; i--)
    {
      if (test_flag & T_VERBOSE)
	printf(" %9s",llstr(next_link,buff));
      if (next_link >= info->state->data_file_length)
	goto wrong;
      if (my_pread(info->dfile,(char*) buff,delete_link_length,
		   next_link,MYF(MY_NABP)))
      {
	if (test_flag & T_VERBOSE) puts("");
	mi_check_print_error(param,"Can't read delete-link at filepos: %s",
		    llstr(next_link,buff));
	DBUG_RETURN(1);
      }
      if (*buff != '\0')
      {
	if (test_flag & T_VERBOSE) puts("");
	mi_check_print_error(param,"Record at pos: %s is not remove-marked",
		    llstr(next_link,buff));
	goto wrong;
      }
      if (info->s->options & HA_OPTION_PACK_RECORD)
      {
	my_off_t prev_link=mi_sizekorr(buff+12);
	if (empty && prev_link != old_link)
	{
	  if (test_flag & T_VERBOSE) puts("");
	  mi_check_print_error(param,"Deleted block at %s doesn't point back at previous delete link",llstr(next_link,buff2));
	  goto wrong;
	}
	old_link=next_link;
	next_link=mi_sizekorr(buff+4);
	empty+=mi_uint3korr(buff+1);
      }
      else
      {
	param->record_checksum+=(ha_checksum) next_link;
	next_link=_mi_rec_pos(info->s,(uchar*) buff+1);
	empty+=info->s->base.pack_reclength;
      }
    }
    if (empty != info->state->empty)
    {
      if (test_flag & T_VERBOSE) puts("");
      mi_check_print_warning(param,
			     "Not used space is supposed to be: %s but is: %s",
			     llstr(info->state->empty,buff),
			     llstr(empty,buff2));
      info->state->empty=empty;
    }
    if (i != 0 || next_link != HA_OFFSET_ERROR)
      goto wrong;

    if (test_flag & T_VERBOSE) puts("\n");
  }
  DBUG_RETURN(0);
wrong:
  param->retry_without_quick=1;		// Don't use quick repair
  if (test_flag & T_VERBOSE) puts("");
  mi_check_print_error(param,"record delete-link-chain corrupted");
  DBUG_RETURN(1);
} /* chk_del */


	/* Check delete links in index file */

static int check_k_link(MI_CHECK *param, register MI_INFO *info, uint nr)
{
  my_off_t next_link;
  uint block_size=(nr+1)*MI_KEY_BLOCK_LENGTH;
  ha_rows records;
  char llbuff[21],*buff;
  DBUG_ENTER("check_k_link");

  if (param->testflag & T_VERBOSE)
    printf("block_size %4d:",block_size);

  next_link=info->s->state.key_del[nr];
  records= (ha_rows) (info->state->key_file_length / block_size);
  while (next_link != HA_OFFSET_ERROR && records > 0)
  {
    if (param->testflag & T_VERBOSE)
      printf("%16s",llstr(next_link,llbuff));
    if (next_link > info->state->key_file_length ||
	next_link & (info->s->blocksize-1))
      DBUG_RETURN(1);
    if (!(buff=key_cache_read(info->s->kfile, next_link, (byte*) info->buff,
			      myisam_block_size, block_size, 1)))
      DBUG_RETURN(1);
    next_link=mi_sizekorr(buff);
    records--;
    param->key_file_blocks+=block_size;
  }
  if (param->testflag & T_VERBOSE)
  {
    if (next_link != HA_OFFSET_ERROR)
      printf("%16s\n",llstr(next_link,llbuff));
    else
      puts("");
  }
  DBUG_RETURN (next_link != HA_OFFSET_ERROR);
} /* check_k_link */


	/* Kontrollerar storleken p} filerna */

int chk_size(MI_CHECK *param, register MI_INFO *info)
{
  int error=0;
  register my_off_t skr,size;
  char buff[22],buff2[22];
  DBUG_ENTER("chk_size");

  if (!(param->testflag & T_SILENT)) puts("- check file-size");

  flush_key_blocks(info->s->kfile, FLUSH_FORCE_WRITE); /* If called externally */

  size=my_seek(info->s->kfile,0L,MY_SEEK_END,MYF(0));
  if ((skr=(my_off_t) info->state->key_file_length) != size)
  {
    if (skr > size)
    {
      error=1;
      mi_check_print_error(param,
			   "Size of indexfile is: %-8s        Should be: %s",
			   llstr(size,buff), llstr(skr,buff2));
    }
    else
      mi_check_print_warning(param,
			     "Size of indexfile is: %-8s      Should be: %s",
			     llstr(size,buff), llstr(skr,buff2));
  }
  if (!(param->testflag & T_VERY_SILENT) &&
      ! (info->s->options & HA_OPTION_COMPRESS_RECORD) &&
      ulonglong2double(info->state->key_file_length) >
      ulonglong2double(info->s->base.margin_key_file_length)*0.9)
    mi_check_print_warning(param,"Keyfile is almost full, %10s of %10s used",
			   llstr(info->state->key_file_length,buff),
			   llstr(info->s->base.max_key_file_length-1,buff));

  size=my_seek(info->dfile,0L,MY_SEEK_END,MYF(0));
  skr=(my_off_t) info->state->data_file_length;
  if (info->s->options & HA_OPTION_COMPRESS_RECORD)
    skr+= MEMMAP_EXTRA_MARGIN;
#ifdef USE_RELOC
  if (info->data_file_type == STATIC_RECORD &&
      skr < (my_off_t) info->s->base.reloc*info->s->base.min_pack_length)
    skr=(my_off_t) info->s->base.reloc*info->s->base.min_pack_length;
#endif
  if (skr != size)
  {
    info->state->data_file_length=size;	/* Skipp other errors */
    if (skr > size && skr != size + MEMMAP_EXTRA_MARGIN)
    {
      error=1;
      mi_check_print_error(param,"Size of datafile is: %-8s         Should be: %s",
		    llstr(size,buff), llstr(skr,buff2));
      param->retry_without_quick=1;		// Don't use quick repair
    }
    else
    {
      mi_check_print_warning(param,
			     "Size of datafile is: %-8s       Should be: %s",
			     llstr(size,buff), llstr(skr,buff2));
    }
  }
  if (!(param->testflag & T_VERY_SILENT) &&
      !(info->s->options & HA_OPTION_COMPRESS_RECORD) &&
      ulonglong2double(info->state->data_file_length) >
      (ulonglong2double(info->s->base.max_data_file_length)*0.9))
    mi_check_print_warning(param, "Datafile is almost full, %10s of %10s used",
			   llstr(info->state->data_file_length,buff),
			   llstr(info->s->base.max_data_file_length-1,buff2));
  DBUG_RETURN(error);
} /* chk_size */


	/* Check keys */

int chk_key(MI_CHECK *param, register MI_INFO *info)
{
  uint key,found_keys=0,full_text_keys=0,result=0;
  ha_rows keys;
  ha_checksum old_record_checksum,init_checksum;
  my_off_t all_keydata,all_totaldata,key_totlength,length;
  ulong   *rec_per_key_part;
  MYISAM_SHARE *share=info->s;
  MI_KEYDEF *keyinfo;
  char buff[22],buff2[22];
  DBUG_ENTER("chk_key");

  if (!(param->testflag & T_SILENT)) puts("- check index reference");

  all_keydata=all_totaldata=key_totlength=0;
  old_record_checksum=0;
  init_checksum=param->record_checksum;
  if (!(share->options &
	(HA_OPTION_PACK_RECORD | HA_OPTION_COMPRESS_RECORD)))
    old_record_checksum=calc_checksum(info->state->records+info->state->del-1)*
      share->base.pack_reclength;
  rec_per_key_part= param->rec_per_key_part;
  for (key= 0,keyinfo= &share->keyinfo[0]; key < share->base.keys ;
       rec_per_key_part+=keyinfo->keysegs, key++, keyinfo++)
  {
    param->key_crc[key]=0;
    if (!(((ulonglong) 1 << key) & share->state.key_map))
    {
      /* Remember old statistics for key */
      memcpy((char*) rec_per_key_part,
	     (char*) share->state.rec_per_key_part+
	     (uint) (rec_per_key_part - param->rec_per_key_part),
	     keyinfo->keysegs*sizeof(*rec_per_key_part));
      continue;
    }
    found_keys++;

    param->record_checksum=init_checksum;
    bzero((char*) &param->unique_count,sizeof(param->unique_count));
    if ((!(param->testflag & T_SILENT)))
      printf ("- check data record references index: %d\n",key+1);
    if (share->state.key_root[key] == HA_OFFSET_ERROR &&
	info->state->records == 0)
      continue;
    if (!_mi_fetch_keypage(info,keyinfo,share->state.key_root[key],info->buff,
			   0))
    {
      mi_check_print_error(param,"Can't read indexpage from filepos: %s",
		  llstr(share->state.key_root[key],buff));
      if (!(param->testflag & T_INFO))
	DBUG_RETURN(-1);
      result= -1;
      continue;
    }
    param->key_file_blocks+=keyinfo->block_length;
    keys=0;
    param->keydata=param->totaldata=0;
    param->key_blocks=0;
    param->max_level=0;
    if (chk_index(param,info,keyinfo,share->state.key_root[key],info->buff,
		  &keys, param->key_crc+key,1))
      DBUG_RETURN(-1);
    if(!(keyinfo->flag & HA_FULLTEXT))
    {
      if (keys != info->state->records)
      {
	mi_check_print_error(param,"Found %s keys of %s",llstr(keys,buff),
		    llstr(info->state->records,buff2));
	if (!(param->testflag & T_INFO))
	DBUG_RETURN(-1);
	result= -1;
	continue;
      }
      if (found_keys - full_text_keys == 1 &&
	  ((share->options &
	    (HA_OPTION_PACK_RECORD | HA_OPTION_COMPRESS_RECORD)) ||
	   (param->testflag & T_DONT_CHECK_CHECKSUM)))
	old_record_checksum=param->record_checksum;
      else if (old_record_checksum != param->record_checksum)
      {
	if (key)
	  mi_check_print_error(param,"Key %u doesn't point at same records that key 1",
		      key+1);
	else
	  mi_check_print_error(param,"Key 1 doesn't point at all records");
	if (!(param->testflag & T_INFO))
	  DBUG_RETURN(-1);
	result= -1;
	continue;
      }
    }
    else
      full_text_keys++;
    /* Check that auto_increment key is bigger than max key value */
    if ((uint) share->base.auto_key -1 == key)
    {
      ulonglong save_auto_value=info->s->state.auto_increment;
      info->s->state.auto_increment=0;
      info->lastinx=key;
      _mi_read_key_record(info, 0L, info->rec_buff);
      update_auto_increment(info, info->rec_buff);
      if (info->s->state.auto_increment > save_auto_value)
      {
	mi_check_print_warning(param,
			       "Auto-increment value: %s is smaller than max used value: %s",
			       llstr(save_auto_value,buff2),
			       llstr(info->s->state.auto_increment, buff));
      }
      if (param->testflag & T_AUTO_INC)
      {
	set_if_bigger(info->s->state.auto_increment,
		      param->auto_increment_value);
      }
      else
	info->s->state.auto_increment=save_auto_value;
    }

    length=(my_off_t) isam_key_length(info,keyinfo)*keys + param->key_blocks*2;
    if (param->testflag & T_INFO && param->totaldata != 0L && keys != 0L)
      printf("Key: %2d:  Keyblocks used: %3d%%  Packed: %4d%%  Max levels: %2d\n",
	     key+1,
	     (int) (my_off_t2double(param->keydata)*100.0/my_off_t2double(param->totaldata)),
	     (int) ((my_off_t2double(length) - my_off_t2double(param->keydata))*100.0/
		    my_off_t2double(length)),
	     param->max_level);
    all_keydata+=param->keydata; all_totaldata+=param->totaldata; key_totlength+=length;

    if (param->testflag & T_STATISTICS)
      update_key_parts(keyinfo, rec_per_key_part, param->unique_count,
		       (ulonglong) info->state->records);
  }
  if (param->testflag & T_INFO)
  {
    if (all_totaldata != 0L && found_keys > 0)
      printf("Total:    Keyblocks used: %3d%%  Packed: %4d%%\n\n",
	     (int) (my_off_t2double(all_keydata)*100.0/
		    my_off_t2double(all_totaldata)),
	     (int) ((my_off_t2double(key_totlength) -
		     my_off_t2double(all_keydata))*100.0/
		     my_off_t2double(key_totlength)));
    else if (all_totaldata != 0L && share->state.key_map)
      puts("");
  }
  if (param->key_file_blocks != info->state->key_file_length &&
      param->keys_in_use != ~(ulonglong) 0)
    mi_check_print_warning(param, "Some data are unreferenced in keyfile");
  if (found_keys != full_text_keys)
    param->record_checksum=old_record_checksum-init_checksum;	/* Remove delete links */
  else
    param->record_checksum=0;
  DBUG_RETURN(0);
} /* chk_key */


	/* Check if index is ok */

static int chk_index(MI_CHECK *param, MI_INFO *info, MI_KEYDEF *keyinfo,
		     my_off_t page, uchar *buff, ha_rows *keys,
		     ha_checksum *key_checksum, uint level)
{
  int flag;
  uint used_length,comp_flag,nod_flag,key_length,not_used;
  uchar key[MI_MAX_POSSIBLE_KEY_BUFF],*temp_buff,*keypos,*old_keypos,*endpos;
  my_off_t next_page,record;
  char llbuff[22],llbuff2[22];
  DBUG_ENTER("chk_index");
  DBUG_DUMP("buff",(byte*) buff,mi_getint(buff));

  if (!(temp_buff=(uchar*) my_alloca((uint) keyinfo->block_length)))
  {
    mi_check_print_error(param,"Not Enough memory");
    DBUG_RETURN(-1);
  }

  if (keyinfo->flag & HA_NOSAME)
    comp_flag=SEARCH_FIND | SEARCH_UPDATE;	/* Not real duplicates */
  else
    comp_flag=SEARCH_SAME;			/* Keys in positionorder */
  nod_flag=mi_test_if_nod(buff);
  used_length=mi_getint(buff);
  keypos=buff+2+nod_flag;
  endpos=buff+used_length;

  param->keydata+=used_length; param->totaldata+=keyinfo->block_length;	/* INFO */
  param->key_blocks++;
  if (level > param->max_level)
    param->max_level=level;

  if (used_length > keyinfo->block_length)
  {
    mi_check_print_error(param,"Wrong pageinfo at page: %s", llstr(page,llbuff));
    goto err;
  }
  for ( ;; )
  {
    if (nod_flag)
    {
      next_page=_mi_kpos(nod_flag,keypos);
      if (next_page > info->state->key_file_length ||
	  (nod_flag && (next_page & (info->s->blocksize -1))))
      {
	my_off_t max_length=my_seek(info->s->kfile,0L,MY_SEEK_END,MYF(0));
	mi_check_print_error(param,"Wrong pagepointer: %s at page: %s",
		    llstr(next_page,llbuff),llstr(page,llbuff2));

	if (next_page+info->s->blocksize > max_length)
	  goto err;
	info->state->key_file_length=(max_length &
					~ (my_off_t) (info->s->blocksize-1));
      }
      if (!_mi_fetch_keypage(info,keyinfo,next_page,temp_buff,0))
      {
	mi_check_print_error(param,"Can't read key from filepos: %s",llstr(next_page,llbuff));
	goto err;
      }
      param->key_file_blocks+=keyinfo->block_length;
      if (chk_index(param,info,keyinfo,next_page,temp_buff,keys,key_checksum,
		    level+1))
	goto err;
    }
    old_keypos=keypos;
    if (keypos >= endpos ||
	(key_length=(*keyinfo->get_key)(keyinfo,nod_flag,&keypos,key)) == 0)
      break;
    if (keypos > endpos)
    {
      mi_check_print_error(param,"Wrong key block length at page: %s",llstr(page,llbuff));
      goto err;
    }
    if ((*keys)++ &&
	(flag=_mi_key_cmp(keyinfo->seg,info->lastkey,key,key_length,
			  comp_flag, &not_used)) >=0)
    {
      DBUG_DUMP("old",(byte*) info->lastkey, info->lastkey_length);
      DBUG_DUMP("new",(byte*) key, key_length);
      DBUG_DUMP("new_in_page",(char*) old_keypos,(uint) (keypos-old_keypos));

      if (comp_flag & SEARCH_FIND && flag == 0)
	mi_check_print_error(param,"Found duplicated key at page %s",llstr(page,llbuff));
      else
	mi_check_print_error(param,"Key in wrong position at page %s",llstr(page,llbuff));
      goto err;
    }
    if (param->testflag & T_STATISTICS)
    {
      if (*keys == 1L)				/* first_key */
	param->unique_count[keyinfo->keysegs]++;
      else
      {
	uint diff;
	_mi_key_cmp(keyinfo->seg,info->lastkey,key,USE_WHOLE_KEY,SEARCH_FIND,
		    &diff);
	param->unique_count[diff-1]++;
      }
    }
    (*key_checksum)+= mi_byte_checksum((byte*) key,
				       key_length- info->s->rec_reflength);
    memcpy((char*) info->lastkey,(char*) key,key_length);
    info->lastkey_length=key_length;
    record= _mi_dpos(info,0,key+key_length);
    if (record >= info->state->data_file_length)
    {
#ifndef DBUG_OFF
      char llbuff3[22];
#endif
      mi_check_print_error(param,"Found key at page %s that points to record outside datafile",llstr(page,llbuff));
      DBUG_PRINT("test",("page: %s  record: %s  filelength: %s",
			 llstr(page,llbuff),llstr(record,llbuff2),
			 llstr(info->state->data_file_length,llbuff3)));
      DBUG_DUMP("key",(byte*) info->lastkey,key_length);
      DBUG_DUMP("new_in_page",(char*) old_keypos,(uint) (keypos-old_keypos));
      goto err;
    }
    param->record_checksum+=(ha_checksum) record;
  }
  if (keypos != endpos)
  {
    mi_check_print_error(param,"Keyblock size at page %s is not correct.  Block length: %d  key length: %d",
                llstr(page,llbuff), used_length, (keypos - buff));
    goto err;
  }
  my_afree((byte*) temp_buff);
  DBUG_RETURN(0);
 err:
  my_afree((byte*) temp_buff);
  DBUG_RETURN(1);
} /* chk_index */


	/* Calculate a checksum of 1+2+3+4...N = N*(N+1)/2 without overflow */

static ha_checksum calc_checksum(ha_rows count)
{
  ulonglong sum,a,b;
  DBUG_ENTER("calc_checksum");

  sum=0;
  a=count; b=count+1;
  if (a & 1)
    b>>=1;
  else
    a>>=1;
  while (b)
  {
    if (b & 1)
      sum+=a;
    a<<=1; b>>=1;
  }
  DBUG_PRINT("exit",("sum: %lx",(ulong) sum));
  DBUG_RETURN((ha_checksum) sum);
} /* calc_checksum */


	/* Calc length of key in normal isam */

static uint isam_key_length(MI_INFO *info, register MI_KEYDEF *keyinfo)
{
  uint length;
  MI_KEYSEG *keyseg;
  DBUG_ENTER("isam_key_length");

  length= info->s->rec_reflength;
  for (keyseg=keyinfo->seg ; keyseg->type ; keyseg++)
    length+= keyseg->length;

  DBUG_PRINT("exit",("length: %d",length));
  DBUG_RETURN(length);
} /* key_length */


	/* Check that record-link is ok */

int chk_data_link(MI_CHECK *param, MI_INFO *info,int extend)
{
  int	error,got_error,flag;
  uint	key,left_length,b_type,field;
  ha_rows records,del_blocks;
  my_off_t used,empty,pos,splits,start_recpos,
	   del_length,link_used,start_block;
  byte	*record,*to;
  char llbuff[22],llbuff2[22],llbuff3[22];
  ha_checksum intern_record_checksum;
  ha_checksum key_checksum[MI_MAX_POSSIBLE_KEY];
  my_bool static_row_size;
  MI_KEYDEF *keyinfo;
  MI_BLOCK_INFO block_info;
  DBUG_ENTER("chk_data_link");

  if (!(param->testflag & T_SILENT))
  {
    if (extend)
      puts("- check records and index references");
    else
      puts("- check record links");
  }

  if (!(record= (byte*) my_alloca(info->s->base.pack_reclength)))
  {
    mi_check_print_error(param,"Not Enough memory");
    DBUG_RETURN(-1);
  }
  records=del_blocks=0;
  used=link_used=splits=del_length=0;
  intern_record_checksum=param->glob_crc=0;
  LINT_INIT(left_length);  LINT_INIT(start_recpos);  LINT_INIT(to);
  got_error=error=0;
  empty=info->s->pack.header_length;

  /* Check how to calculate checksum of rows */
  static_row_size=1;
  if (info->s->data_file_type == COMPRESSED_RECORD)
  {
    for (field=0 ; field < info->s->base.fields ; field++)
    {
      if (info->s->rec[field].base_type == FIELD_BLOB ||
	  info->s->rec[field].base_type == FIELD_VARCHAR)
      {
	static_row_size=0;
	break;
      }
    }
  }

  pos=my_b_tell(&param->read_cache);
  bzero((char*) key_checksum, info->s->base.keys * sizeof(key_checksum[0]));
  while (pos < info->state->data_file_length)
  {
    switch (info->s->data_file_type) {
    case STATIC_RECORD:
      if (my_b_read(&param->read_cache,(byte*) record,
		    info->s->base.pack_reclength))
	goto err;
      start_recpos=pos;
      pos+=info->s->base.pack_reclength;
      splits++;
      if (*record == '\0')
      {
	del_blocks++;
	del_length+=info->s->base.pack_reclength;
	continue;					/* Record removed */
      }
      param->glob_crc+= mi_static_checksum(info,record);
      used+=info->s->base.pack_reclength;
      break;
    case DYNAMIC_RECORD:
      flag=block_info.second_read=0;
      block_info.next_filepos=pos;
      do
      {
	if (_mi_read_cache(&param->read_cache,(byte*) block_info.header,
			  (start_block=block_info.next_filepos),
			  sizeof(block_info.header),test(! flag) | 2))
	  goto err;
	if (start_block & (MI_DYN_ALIGN_SIZE-1))
	{
	  mi_check_print_error(param,"Wrong aligned block at %s",llstr(start_block,llbuff));
	  goto err2;
	}
	b_type=_mi_get_block_info(&block_info,-1,start_block);
	if (b_type & (BLOCK_DELETED | BLOCK_ERROR | BLOCK_SYNC_ERROR |
		      BLOCK_FATAL_ERROR))
	{
	  if (b_type & BLOCK_SYNC_ERROR)
	  {
	    if (flag)
	    {
	      mi_check_print_error(param,"Unexpected byte: %d at link: %s",
			  (int) block_info.header[0],
			  llstr(start_block,llbuff));
	      goto err2;
	    }
	    pos=block_info.filepos+block_info.block_len;
	    goto next;
	  }
	  if (b_type & BLOCK_DELETED)
	  {
	    if (block_info.block_len < info->s->base.min_block_length)
	    {
	      mi_check_print_error(param,
				   "Deleted block with impossible length %lu at %s",
				   block_info.block_len,llstr(pos,llbuff));
	      goto err2;
	    }
	    if ((block_info.next_filepos != HA_OFFSET_ERROR &&
		 block_info.next_filepos >= info->state->data_file_length) ||
		(block_info.prev_filepos != HA_OFFSET_ERROR &&
		 block_info.prev_filepos >= info->state->data_file_length))
	    {
	      mi_check_print_error(param,"Delete link points outside datafile at %s",
			  llstr(pos,llbuff));
	      goto err2;
	    }
	    del_blocks++;
	    del_length+=block_info.block_len;
	    pos=block_info.filepos+block_info.block_len;
	    splits++;
	    goto next;
	  }
	  mi_check_print_error(param,"Wrong bytesec: %d-%d-%d at linkstart: %s",
		      block_info.header[0],block_info.header[1],
		      block_info.header[2],
		      llstr(start_block,llbuff));
	  goto err2;
	}
	if (info->state->data_file_length < block_info.filepos+
	    block_info.block_len)
	{
	  mi_check_print_error(param,"Recordlink that points outside datafile at %s",
		      llstr(pos,llbuff));
	  got_error=1;
	  break;
	}
	splits++;
	if (!flag++)				/* First block */
	{
	  start_recpos=pos;
	  pos=block_info.filepos+block_info.block_len;
	  if (block_info.rec_len > (uint) info->s->base.max_pack_length)
	  {
	    mi_check_print_error(param,"Found too long record (%d) at %s",
			block_info.rec_len,
			llstr(start_recpos,llbuff));
	    got_error=1;
	    break;
	  }
	  if (info->s->base.blobs)
	  {
	    if (!(to=mi_fix_rec_buff_for_blob(info,block_info.rec_len)))
	    {
	      mi_check_print_error(param,"Not enough memory for blob at %s",
			  llstr(start_recpos,llbuff));
	      got_error=1;
	      break;
	    }
	  }
	  else
	    to= info->rec_buff;
	  left_length=block_info.rec_len;
	}
	if (left_length < block_info.data_len)
	{
	  mi_check_print_error(param,"Found too long record at %s",
		      llstr(start_recpos,llbuff));
	  got_error=1; break;
	}
	if (_mi_read_cache(&param->read_cache,(byte*) to,block_info.filepos,
			   (uint) block_info.data_len, test(flag == 1)))
	  goto err;
	to+=block_info.data_len;
	link_used+= block_info.filepos-start_block;
	used+= block_info.filepos - start_block + block_info.data_len;
	empty+=block_info.block_len-block_info.data_len;
	left_length-=block_info.data_len;
	if (left_length)
	{
	  if (b_type & BLOCK_LAST)
	  {
	    mi_check_print_error(param,"Record link to short for record at %s",
			llstr(start_recpos,llbuff));
	    got_error=1;
	    break;
	  }
	  if (info->state->data_file_length < block_info.next_filepos)
	  {
	    mi_check_print_error(param,"Found next-recordlink that points outside datafile at %s",
			llstr(block_info.filepos,llbuff));
	    got_error=1;
	    break;
	  }
	}
      } while (left_length);
      if (! got_error)
      {
	if (_mi_rec_unpack(info,record,info->rec_buff,block_info.rec_len) ==
	    MY_FILE_ERROR)
	{
	  mi_check_print_error(param,"Found wrong record at %s", llstr(start_recpos,llbuff));
	  got_error=1;
	}
	else
	{
	  info->checksum=mi_checksum(info,record);
	  if (param->testflag & (T_EXTEND | T_MEDIUM | T_VERBOSE))
	  {
	    if (_mi_rec_check(info,record))
	    {
	      mi_check_print_error(param,"Found wrong packed record at %s",
			  llstr(start_recpos,llbuff));
	      got_error=1;
	    }
	  }
	  if (!got_error)
	    param->glob_crc+= info->checksum;
	}
      }
      else if (!flag)
	pos=block_info.filepos+block_info.block_len;
      break;
    case COMPRESSED_RECORD:
      if (_mi_read_cache(&param->read_cache,(byte*) block_info.header, pos,
			 info->s->pack.ref_length, 1))
	goto err;
      start_recpos=pos;
      splits++;
      VOID(_mi_pack_get_block_info(info,&block_info, -1, start_recpos, NullS));
      pos=block_info.filepos+block_info.rec_len;
      if (block_info.rec_len < (uint) info->s->min_pack_length ||
	  block_info.rec_len > (uint) info->s->max_pack_length)
      {
	mi_check_print_error(param,"Found block with wrong recordlength: %d at %s",
		    block_info.rec_len, llstr(start_recpos,llbuff));
	got_error=1;
	break;
      }
      if (_mi_read_cache(&param->read_cache,(byte*) info->rec_buff,
			block_info.filepos, block_info.rec_len,1))
	goto err;
      if (_mi_pack_rec_unpack(info,record,info->rec_buff,block_info.rec_len))
      {
	mi_check_print_error(param,"Found wrong record at %s", llstr(start_recpos,llbuff));
	got_error=1;
      }
      if (static_row_size)
	param->glob_crc+= mi_static_checksum(info,record);
      else
	param->glob_crc+= mi_checksum(info,record);
      link_used+= (block_info.filepos - start_recpos);
      used+= (pos-start_recpos);
    } /* switch */
    if (! got_error)
    {
      intern_record_checksum+=(ha_checksum) start_recpos;
      records++;
      if (param->testflag & T_WRITE_LOOP && records % WRITE_COUNT == 0)
      {
	printf("%s\r", llstr(records,llbuff)); VOID(fflush(stdout));
      }

      /* Check if keys match the record */

      for (key=0,keyinfo= info->s->keyinfo; key < info->s->base.keys;
	   key++,keyinfo++)
      {
	if ((((ulonglong) 1 << key) & info->s->state.key_map))
	{
	  if(!(keyinfo->flag & HA_FULLTEXT))
	  {
	    uint key_length=_mi_make_key(info,key,info->lastkey,record,
					 start_recpos);
	    if (extend)
	    {
	      /* We don't need to lock the key tree here as we don't allow
		 concurrent threads when running myisamchk
	      */
	      if (_mi_search(info,keyinfo,info->lastkey,key_length,
			     SEARCH_SAME, info->s->state.key_root[key]))
	      {
		mi_check_print_error(param,"Record at: %10s  Can't find key for index: %2d",
			    llstr(start_recpos,llbuff),key+1);
		if (error++ > MAXERR || !(param->testflag & T_VERBOSE))
		  goto err2;
	      }
	    }
	    else
	      key_checksum[key]+=mi_byte_checksum((byte*) info->lastkey,
						  key_length);
	  }
	}
      }
    }
    else
    {
      got_error=0;
      if (error++ > MAXERR || !(param->testflag & T_VERBOSE))
	goto err2;
    }
  next:;				/* Next record */
  }
  if (param->testflag & T_WRITE_LOOP)
  {
    VOID(fputs("          \r",stdout)); VOID(fflush(stdout));
  }
  if (records != info->state->records)
  {
    mi_check_print_error(param,"Record-count is not ok; is %-10s   Should be: %s",
		llstr(records,llbuff), llstr(info->state->records,llbuff2));
    error=1;
  }
  else if (param->record_checksum &&
	   param->record_checksum != intern_record_checksum)
  {
    mi_check_print_error(param,
			 "Keypointers and record positions doesn't match");
    error=1;
  }
  else if (param->glob_crc != info->s->state.checksum &&
	   (info->s->options &
	    (HA_OPTION_CHECKSUM | HA_OPTION_COMPRESS_RECORD)))
  {
    mi_check_print_warning(param,
			   "Record checksum is not the same as checksum stored in the index file\n");
    error=1;
  }
  else if (!extend)
  {
    for (key=0 ; key < info->s->base.keys;  key++)
    {
      if (key_checksum[key] != param->key_crc[key] &&
          !(info->s->keyinfo[key].flag & HA_FULLTEXT))
      {
	mi_check_print_error(param,"Checksum for key: %2d doesn't match checksum for records",
		    key+1);
	error=1;
      }
    }
  }

  if (used+empty+del_length != info->state->data_file_length)
  {
    mi_check_print_warning(param,
			   "Found %s record-data and %s unused data and %s deleted-data",
			   llstr(used,llbuff),llstr(empty,llbuff2),
			   llstr(del_length,llbuff3));
    mi_check_print_warning(param,
			   "Total %s, Should be: %s",
			   llstr((used+empty+del_length),llbuff),
			   llstr(info->state->data_file_length,llbuff2));
  }
  if (del_blocks != info->state->del)
  {
    mi_check_print_warning(param,
			   "Found %10s deleted blocks       Should be: %s",
			   llstr(del_blocks,llbuff),
			   llstr(info->state->del,llbuff2));
  }
  if (splits != info->s->state.split)
  {
    mi_check_print_warning(param,
			   "Found %10s parts                Should be: %s parts",
			   llstr(splits,llbuff),
			   llstr(info->s->state.split,llbuff2));
  }
  if (param->testflag & T_INFO)
  {
    if (param->warning_printed || param->error_printed)
      puts("");
    if (used != 0 && ! param->error_printed)
    {
      printf("Records:%18s    M.recordlength:%9lu   Packed:%14.0f%%\n",
 	     llstr(records,llbuff), (long)((used-link_used)/records),
	     (info->s->base.blobs ? 0.0 :
	      (ulonglong2double((ulonglong) info->s->base.reclength*records)-
	       my_off_t2double(used))/
	      ulonglong2double((ulonglong) info->s->base.reclength*records)*100.0));
      printf("Recordspace used:%9.0f%%   Empty space:%12d%%  Blocks/Record: %6.2f\n",
	     (ulonglong2double(used-link_used)/ulonglong2double(used-link_used+empty)*100.0),
	     (!records ? 100 : (int) (ulonglong2double(del_length+empty)/
				      my_off_t2double(used)*100.0)),
	     ulonglong2double(splits - del_blocks) / records);
    }
    printf("Record blocks:%12s    Delete blocks:%10s\n",
	   llstr(splits-del_blocks,llbuff),llstr(del_blocks,llbuff2));
    printf("Record data:  %12s    Deleted data: %10s\n",
	   llstr(used-link_used,llbuff),llstr(del_length,llbuff2));
    printf("Lost space:   %12s    Linkdata:     %10s\n",
	   llstr(empty,llbuff),llstr(link_used,llbuff2));
  }
  my_afree((gptr) record);
  DBUG_RETURN (error);
 err:
  mi_check_print_error(param,"got error: %d when reading datafile",my_errno);
 err2:
  my_afree((gptr) record);
  DBUG_RETURN(1);
} /* chk_data_link */


	/* Recover old table by reading each record and writing all keys */
	/* Save new datafile-name in temp_filename */

int mi_repair(MI_CHECK *param, register MI_INFO *info,
	      my_string name, int rep_quick)
{
  int error,got_error;
  uint i;
  ha_rows start_records,new_header_length;
  my_off_t del;
  File new_file;
  MYISAM_SHARE *share=info->s;
  char llbuff[22],llbuff2[22];
  SORT_INFO *sort_info= &param->sort_info;
  DBUG_ENTER("mi_repair");

  start_records=info->state->records;
  new_header_length=(param->testflag & T_UNPACK) ? 0L :
    share->pack.header_length;
  got_error=1;
  new_file= -1;
  if (!(param->testflag & T_SILENT))
  {
    printf("- recovering (with keycache) MyISAM-table '%s'\n",name);
    printf("Data records: %s\n", llstr(info->state->records,llbuff));
  }

  if (!param->using_global_keycache)
    VOID(init_key_cache(param->use_buffers,NEAD_MEM));

  if (init_io_cache(&param->read_cache,info->dfile,
		    (uint) param->read_buffer_length,
		    READ_CACHE,share->pack.header_length,1,MYF(MY_WME)))
    goto err;
  if (!rep_quick)
    if (init_io_cache(&info->rec_cache,-1,(uint) param->write_buffer_length,
		      WRITE_CACHE, new_header_length, 1,
		      MYF(MY_WME | MY_WAIT_IF_FULL)))
      goto err;
  info->opt_flag|=WRITE_CACHE_USED;
  sort_info->start_recpos=0;
  sort_info->buff=0; sort_info->buff_length=0;
  if (!(sort_info->record=(byte*) my_malloc((uint) share->base.pack_reclength,
					   MYF(0))))
  {
    mi_check_print_error(param,"Not enough memory for extra record");
    goto err;
  }

  if (!rep_quick)
  {
    if ((new_file=my_raid_create(fn_format(param->temp_filename,name,"",
					   DATA_TMP_EXT,
					   2+4),
				 0,param->tmpfile_createflag,
				 share->base.raid_type,
				 share->base.raid_chunks,
				 share->base.raid_chunksize,
				 MYF(0))) < 0)
    {
      mi_check_print_error(param,"Can't create new tempfile: '%s'",
			   param->temp_filename);
      goto err;
    }
    if (filecopy(param,new_file,info->dfile,0L,new_header_length,
		 "datafile-header"))
      goto err;
    info->s->state.dellink= HA_OFFSET_ERROR;
    info->rec_cache.file=new_file;
    if (param->testflag & T_UNPACK)
    {
      share->options&= ~HA_OPTION_COMPRESS_RECORD;
      mi_int2store(share->state.header.options,share->options);
    }
  }
  sort_info->info=info;
  sort_info->pos=sort_info->max_pos=share->pack.header_length;
  sort_info->filepos=new_header_length;
  param->read_cache.end_of_file=sort_info->filelength=
    my_seek(info->dfile,0L,MY_SEEK_END,MYF(0));
  sort_info->dupp=0;
  sort_info->fix_datafile= (my_bool) (! rep_quick);
  sort_info->max_records= ~(ha_rows) 0;
  if ((sort_info->new_data_file_type=share->data_file_type) ==
      COMPRESSED_RECORD && param->testflag & T_UNPACK)
  {
    if (share->options & HA_OPTION_PACK_RECORD)
      sort_info->new_data_file_type = DYNAMIC_RECORD;
    else
      sort_info->new_data_file_type = STATIC_RECORD;
  }

  del=info->state->del;
  info->state->records=info->state->del=share->state.split=0;
  info->state->empty=0;
  if (sort_info->new_data_file_type != COMPRESSED_RECORD && !rep_quick)
    share->state.checksum=0;
  info->update= (short) (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
  for (i=0 ; i < info->s->base.keys ; i++)
    share->state.key_root[i]= HA_OFFSET_ERROR;
  for (i=0 ; i < share->state.header.max_block_size ; i++)
    share->state.key_del[i]=  HA_OFFSET_ERROR;

  /* I think mi_repair and mi_repair_by_sort should do the same
     (according, e.g. to ha_myisam::repair), but as mi_repair doesn't
     touch key_map it cannot be used to T_CREATE_MISSING_KEYS.
     That is the next line for... (serg)
  */

  share->state.key_map= ((ulonglong)1L << share->base.keys)-1;

  info->state->key_file_length=share->base.keystart;

  lock_memory(param);			/* Everything is alloced */
  while (!(error=sort_get_next_record(sort_info)))
  {
    if (writekeys(info,(byte*) sort_info->record,sort_info->filepos))
    {
      if (my_errno != HA_ERR_FOUND_DUPP_KEY) goto err;
      DBUG_DUMP("record",(byte*) sort_info->record,share->base.pack_reclength);
      mi_check_print_info(param,"Duplicate key %2d for record at %10s against new record at %10s",
		 info->errkey+1,
		 llstr(sort_info->start_recpos,llbuff),
		 llstr(info->lastpos,llbuff2));
      if (param->testflag & T_VERBOSE)
      {
	VOID(_mi_make_key(info,(uint) info->errkey,info->lastkey,
			  sort_info->record,0L));
	_mi_print_key(stdout,share->keyinfo[info->errkey].seg,info->lastkey,
		      USE_WHOLE_KEY);
      }
      sort_info->dupp++;
      if (rep_quick == 1)
      {
	param->error_printed=1;
	goto err;
      }
      continue;
    }
    if (sort_write_record(sort_info))
      goto err;
  }
  if (error > 0 || write_data_suffix(param,info) ||
      flush_io_cache(&info->rec_cache) || param->read_cache.error < 0)
    goto err;

  if (param->testflag & T_WRITE_LOOP)
  {
    VOID(fputs("          \r",stdout)); VOID(fflush(stdout));
  }
  if (my_chsize(share->kfile,info->state->key_file_length,MYF(0)))
  {
    mi_check_print_warning(param,
			   "Can't change size of indexfile, error: %d",
			   my_errno);
    goto err;
  }

  if (rep_quick && del+sort_info->dupp != info->state->del)
  {
    mi_check_print_error(param,"Couldn't fix table with quick recovery: Found wrong number of deleted records");
    mi_check_print_error(param,"Run recovery again without -q");
    got_error=1;
    param->retry_repair=param->retry_without_quick=1;
    goto err;
  }

  if (!rep_quick)
  {
    my_close(info->dfile,MYF(0));
    info->dfile=new_file;
    info->state->data_file_length=sort_info->filepos;
    /* Only whole records */
    share->state.split=info->state->records+info->state->del;
    param->out_flag|=O_NEW_DATA;			/* Data in new file */
    share->state.version=(ulong) time((time_t*) 0);	/* Force reopen */
  }
  else
    info->state->data_file_length=sort_info->max_pos;

  if (!(param->testflag & T_SILENT))
  {
    if (start_records != info->state->records)
      printf("Data records: %s\n", llstr(info->state->records,llbuff));
    if (sort_info->dupp)
      mi_check_print_warning(param,
			     "%s records have been removed",
			     llstr(sort_info->dupp,llbuff));
  }

  got_error=0;
  /* If invoked by external program that uses thr_lock */
  if (&share->state.state != info->state)
    memcpy( &share->state.state, info->state, sizeof(*info->state));

err:
  if (got_error)
  {
    if (! param->error_printed)
      mi_check_print_error(param,"%d for record at pos %s",my_errno,
		  llstr(sort_info->start_recpos,llbuff));
    if (new_file >= 0)
    {
      VOID(my_close(new_file,MYF(0)));
      VOID(my_raid_delete(param->temp_filename,info->s->base.raid_chunks,
			  MYF(MY_WME)));
    }
    mi_mark_crashed_on_repair(info);
  }
  if (sort_info->record)
    my_free(sort_info->record,MYF(0));

  my_free(sort_info->buff,MYF(MY_ALLOW_ZERO_PTR));
  VOID(end_io_cache(&param->read_cache));
  info->opt_flag&= ~(READ_CACHE_USED | WRITE_CACHE_USED);
  VOID(end_io_cache(&info->rec_cache));
  got_error|=flush_blocks(param,share->kfile);
  if (!got_error && param->testflag & T_UNPACK)
  {
    share->state.header.options[0]&= (uchar) ~HA_OPTION_COMPRESS_RECORD;
    share->pack.header_length=0;
    share->data_file_type=sort_info->new_data_file_type;
  }
  share->state.changed|=STATE_NOT_OPTIMIZED_KEYS | STATE_NOT_SORTED_PAGES;
  DBUG_RETURN(got_error);
}


/* Uppate keyfile when doing repair */

static int writekeys(register MI_INFO *info,byte *buff,my_off_t filepos)
{
  register uint i;
  uchar *key;
  DBUG_ENTER("writekeys");

  key=info->lastkey+info->s->base.max_key_length;
  for (i=0 ; i < info->s->base.keys ; i++)
  {
    if (((ulonglong) 1 << i) & info->s->state.key_map)
    {
      if (info->s->keyinfo[i].flag & HA_FULLTEXT )
      {
        if (_mi_ft_add(info,i,(char*) key,buff,filepos))  goto err;
      }
      else
      {
	uint key_length=_mi_make_key(info,i,key,buff,filepos);
	if (_mi_ck_write(info,i,key,key_length)) goto err;
      }
    }
  }
  DBUG_RETURN(0);

 err:
  if (my_errno == HA_ERR_FOUND_DUPP_KEY)
  {
    info->errkey=(int) i;			/* This key was found */
    while ( i-- > 0 )
    {
      if (((ulonglong) 1 << i) & info->s->state.key_map)
      {
	if (info->s->keyinfo[i].flag & HA_FULLTEXT)
        {
          if (_mi_ft_del(info,i,(char*) key,buff,filepos)) break;
        }
        else
	{
	  uint key_length=_mi_make_key(info,i,key,buff,filepos);
	  if (_mi_ck_delete(info,i,key,key_length)) break;
	}
      }
    }
  }
  DBUG_PRINT("error",("errno: %d",my_errno));
  DBUG_RETURN(-1);
} /* writekeys */


	/* Change all key-pointers that points to a records */

int movepoint(register MI_INFO *info, byte *record, my_off_t oldpos,
	      my_off_t newpos, uint prot_key)
{
  register uint i;
  uchar *key;
  uint key_length;
  DBUG_ENTER("movepoint");

  key=info->lastkey+info->s->base.max_key_length;
  for (i=0 ; i < info->s->base.keys; i++)
  {
    if (i != prot_key && (((ulonglong) 1 << i) & info->s->state.key_map))
    {
      key_length=_mi_make_key(info,i,key,record,oldpos);
      if (info->s->keyinfo[i].flag & HA_NOSAME)
      {					/* Change pointer direct */
	uint nod_flag;
	MI_KEYDEF *keyinfo;
	keyinfo=info->s->keyinfo+i;
	if (_mi_search(info,keyinfo,key,USE_WHOLE_KEY,
		       (uint) (SEARCH_SAME | SEARCH_SAVE_BUFF),
		       info->s->state.key_root[i]))
	  DBUG_RETURN(-1);
	nod_flag=mi_test_if_nod(info->buff);
	_mi_dpointer(info,info->int_keypos-nod_flag-
		     info->s->rec_reflength,newpos);
	if (_mi_write_keypage(info,keyinfo,info->last_keypage,info->buff))
	  DBUG_RETURN(-1);
      }
      else
      {					/* Change old key to new */
	if (_mi_ck_delete(info,i,key,key_length))
	  DBUG_RETURN(-1);
	key_length=_mi_make_key(info,i,key,record,newpos);
	if (_mi_ck_write(info,i,key,key_length))
	  DBUG_RETURN(-1);
      }
    }
  }
  DBUG_RETURN(0);
} /* movepoint */


	/* Tell system that we want all memory for our cache */

void lock_memory(MI_CHECK *param __attribute__((unused)))
{
#ifdef SUN_OS				/* Key-cacheing thrases on sun 4.1 */
  if (param->opt_lock_memory)
  {
    int success = mlockall(MCL_CURRENT);	/* or plock(DATLOCK); */
    if (geteuid() == 0 && success != 0)
      mi_check_print_warning(param,
			     "Failed to lock memory. errno %d",my_errno);
  }
#endif
} /* lock_memory */


	/* Flush all changed blocks to disk */

int flush_blocks(MI_CHECK *param, File file)
{
  if (flush_key_blocks(file,FLUSH_RELEASE))
  {
    mi_check_print_error(param,"%d when trying to write bufferts",my_errno);
    return(1);
  }
  if (!param->using_global_keycache)
    end_key_cache();
  return 0;
} /* flush_blocks */


	/* Sort index for more efficent reads */

int mi_sort_index(MI_CHECK *param, register MI_INFO *info, my_string name)
{
  reg2 uint key;
  reg1 MI_KEYDEF *keyinfo;
  File new_file;
  my_off_t index_pos[MI_MAX_POSSIBLE_KEY];
  DBUG_ENTER("sort_index");

  if (!(param->testflag & T_SILENT))
    printf("- Sorting index for MyISAM-table '%s'\n",name);

  if ((new_file=my_create(fn_format(param->temp_filename,name,"",
				    INDEX_TMP_EXT,2+4),
			  0,param->tmpfile_createflag,MYF(0))) <= 0)
  {
    mi_check_print_error(param,"Can't create new tempfile: '%s'",
			 param->temp_filename);
    DBUG_RETURN(-1);
  }
  if (filecopy(param, new_file,info->s->kfile,0L,
	       (ulong) info->s->base.keystart, "headerblock"))
    goto err;

  param->new_file_pos=info->s->base.keystart;
  for (key= 0,keyinfo= &info->s->keyinfo[0]; key < info->s->base.keys ;
       key++,keyinfo++)
  {
    if (!(((ulonglong) 1 << key) & info->s->state.key_map))
      continue;

    if (info->s->state.key_root[key] != HA_OFFSET_ERROR)
    {
      index_pos[key]=param->new_file_pos;		/* Write first block here */
      if (sort_one_index(param,info,keyinfo,info->s->state.key_root[key],
			 new_file))
	goto err;
    }
    else
      index_pos[key]= HA_OFFSET_ERROR;		/* No blocks */
  }

  /* Flush key cache for this file if we are calling this outside myisamchk */
  flush_key_blocks(info->s->kfile, FLUSH_IGNORE_CHANGED);

	/* Put same locks as old file */
  if (lock_file(param,new_file,0L,F_WRLCK,"tempfile",param->temp_filename))
    goto err;
  info->s->state.version=(ulong) time((time_t*) 0);
  VOID(_mi_writeinfo(info,WRITEINFO_UPDATE_KEYFILE));
  VOID(my_close(info->s->kfile,MYF(MY_WME)));
  param->out_flag|=O_NEW_INDEX;			/* Data in new file */

  info->s->kfile=new_file;
  info->state->key_file_length=param->new_file_pos;
  info->update= (short) (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
  for (key=0 ; key < info->s->base.keys ; key++)
    info->s->state.key_root[key]=index_pos[key];
  for (key=0 ; key < info->s->state.header.max_block_size ; key++)
    info->s->state.key_del[key]=  HA_OFFSET_ERROR;

  info->s->state.changed&= ~STATE_NOT_SORTED_PAGES;
  DBUG_RETURN(0);

err:
  VOID(my_close(new_file,MYF(MY_WME)));
  VOID(my_delete(param->temp_filename,MYF(MY_WME)));
  DBUG_RETURN(-1);
} /* sort_index */


	 /* Sort records recursive using one index */

static int sort_one_index(MI_CHECK *param, MI_INFO *info, MI_KEYDEF *keyinfo,
			  my_off_t pagepos, File new_file)
{
  uint length,nod_flag,used_length;
  uchar *buff,*keypos,*endpos;
  uchar key[MI_MAX_POSSIBLE_KEY_BUFF];
  my_off_t new_page_pos,next_page;
  char llbuff[22];
  DBUG_ENTER("sort_one_index");

  new_page_pos=param->new_file_pos;
  param->new_file_pos+=keyinfo->block_length;

  if (!(buff=(uchar*) my_alloca((uint) keyinfo->block_length)))
  {
    mi_check_print_error(param,"Not Enough memory");
    DBUG_RETURN(-1);
  }
  if (!_mi_fetch_keypage(info,keyinfo,pagepos,buff,0))
  {
    mi_check_print_error(param,"Can't read key block from filepos: %s",
		llstr(pagepos,llbuff));
    goto err;
  }
  if ((nod_flag=mi_test_if_nod(buff)))
  {
    used_length=mi_getint(buff);
    keypos=buff+2+nod_flag;
    endpos=buff+used_length;
    for ( ;; )
    {
      if (nod_flag)
      {
	next_page=_mi_kpos(nod_flag,keypos);
	_mi_kpointer(info,keypos-nod_flag,param->new_file_pos); /* Save new pos */
	if (sort_one_index(param,info,keyinfo,next_page, new_file))
	{
	  DBUG_PRINT("error",("From page: %ld, keyoffset: %d  used_length: %d",
			      (ulong) pagepos, (int) (keypos - buff),
			      (int) used_length));
	  DBUG_DUMP("buff",(byte*) buff,used_length);
	  goto err;
	}
      }
      if (keypos >= endpos ||
	  ((*keyinfo->get_key)(keyinfo,nod_flag,&keypos,key)) == 0)
	break;
#ifdef EXTRA_DEBUG
      assert(keypos <= endpos);
#endif
    }
  }

  /* Fill block with zero and write it to the new index file */
  length=mi_getint(buff);
  bzero((byte*) buff+length,keyinfo->block_length-length);
  if (my_pwrite(new_file,(byte*) buff,(uint) keyinfo->block_length,
		new_page_pos,MYF(MY_NABP | MY_WAIT_IF_FULL)))
  {
    mi_check_print_error(param,"Can't write indexblock, error: %d",my_errno);
    goto err;
  }
  my_afree((gptr) buff);
  DBUG_RETURN(0);
err:
  my_afree((gptr) buff);
  DBUG_RETURN(1);
} /* sort_one_index */


	/* Change to use new file */
	/* Copy stats from old file to new file, deletes orginal and */
	/* changes new file name to old file name */

int change_to_newfile(const char * filename, const char * old_ext,
		      const char * new_ext,
		      uint raid_chunks __attribute__((unused)),
		      myf MyFlags)
{
  char old_filename[FN_REFLEN],new_filename[FN_REFLEN];
#ifdef USE_RAID
  if (raid_chunks)
    return my_raid_redel(fn_format(old_filename,filename,"",old_ext,2+4),
			 fn_format(new_filename,filename,"",new_ext,2+4),
			 raid_chunks,
			 MYF(MY_WME | MY_LINK_WARNING | MyFlags));
#endif
  return my_redel(fn_format(old_filename,filename,"",old_ext,2+4),
		  fn_format(new_filename,filename,"",new_ext,2+4),
		  MYF(MY_WME | MY_LINK_WARNING | MyFlags));
} /* change_to_newfile */


	/* Locks a whole file */
	/* Gives an error-message if file can't be locked */

int lock_file(MI_CHECK *param, File file, my_off_t start, int lock_type,
	      const char *filetype, const char *filename)
{
  if (my_lock(file,lock_type,start,F_TO_EOF,
	      param->testflag & T_WAIT_FOREVER ? MYF(MY_SEEK_NOT_DONE) :
	      MYF(MY_SEEK_NOT_DONE |  MY_DONT_WAIT)))
  {
    mi_check_print_error(param," %d when locking %s '%s'",my_errno,filetype,filename);
    param->error_printed=2;		/* Don't give that data is crashed */
    return 1;
  }
  return 0;
} /* lock_file */


	/* Copy a block between two files */

int filecopy(MI_CHECK *param, File to,File from,my_off_t start,
	     my_off_t length, const char *type)
{
  char tmp_buff[IO_SIZE],*buff;
  ulong buff_length;
  DBUG_ENTER("filecopy");

  buff_length=(ulong) min(param->write_buffer_length,length);
  if (!(buff=my_malloc(buff_length,MYF(0))))
  {
    buff=tmp_buff; buff_length=IO_SIZE;
  }

  VOID(my_seek(from,start,MY_SEEK_SET,MYF(0)));
  while (length > buff_length)
  {
    if (my_read(from,(byte*) buff,buff_length,MYF(MY_NABP)) ||
	my_write(to,(byte*) buff,buff_length,param->myf_rw))
      goto err;
    length-= buff_length;
  }
  if (my_read(from,(byte*) buff,(uint) length,MYF(MY_NABP)) ||
      my_write(to,(byte*) buff,(uint) length,param->myf_rw))
    goto err;
  if (buff != tmp_buff)
    my_free(buff,MYF(0));
  DBUG_RETURN(0);
err:
  if (buff != tmp_buff)
    my_free(buff,MYF(0));
  mi_check_print_error(param,"Can't copy %s to tempfile, error %d",
		       type,my_errno);
  DBUG_RETURN(1);
}

	/* Fix table or given index using sorting */
	/* saves new table in temp_filename */

int mi_repair_by_sort(MI_CHECK *param, register MI_INFO *info,
		      const char * name, int rep_quick)
{
  int got_error;
  uint i;
  ulong length;
  ha_rows start_records;
  my_off_t new_header_length,del;
  File new_file;
  MI_SORT_PARAM sort_param;
  MYISAM_SHARE *share=info->s;
  ulong   *rec_per_key_part;
  char llbuff[22];
  SORT_INFO *sort_info= &param->sort_info;
  ulonglong key_map=share->state.key_map;
  DBUG_ENTER("mi_repair_by_sort");

  start_records=info->state->records;
  got_error=1;
  new_file= -1;
  new_header_length=(param->testflag & T_UNPACK) ? 0 :
    share->pack.header_length;
  if (!(param->testflag & T_SILENT))
  {
    printf("- recovering (with sort) MyISAM-table '%s'\n",name);
    printf("Data records: %s\n", llstr(start_records,llbuff));
  }
  bzero((char*) sort_info,sizeof(*sort_info));
  if (!(sort_info->key_block=
	alloc_key_blocks(param,
			 (uint) param->sort_key_blocks,
			 share->base.max_key_block_length))
      || init_io_cache(&param->read_cache,info->dfile,
		       (uint) param->read_buffer_length,
		       READ_CACHE,share->pack.header_length,1,MYF(MY_WME)) ||
      (! rep_quick &&
       init_io_cache(&info->rec_cache,info->dfile,
		     (uint) param->write_buffer_length,
		     WRITE_CACHE,new_header_length,1,
		     MYF(MY_WME | MY_WAIT_IF_FULL) & param->myf_rw)))
    goto err;
  sort_info->key_block_end=sort_info->key_block+param->sort_key_blocks;
  info->opt_flag|=WRITE_CACHE_USED;
  info->rec_cache.file=info->dfile;		/* for sort_delete_record */

  if (!(sort_info->record=(byte*) my_malloc((uint) share->base.pack_reclength,
					   MYF(0))))
  {
    mi_check_print_error(param,"Not enough memory for extra record");
    goto err;
  }
  if (!rep_quick)
  {
    if ((new_file=my_raid_create(fn_format(param->temp_filename,name,"",
					   DATA_TMP_EXT,
					   2+4),
				 0,param->tmpfile_createflag,
				 share->base.raid_type,
				 share->base.raid_chunks,
				 share->base.raid_chunksize,
				 MYF(0))) < 0)
    {
      mi_check_print_error(param,"Can't create new tempfile: '%s'",
			   param->temp_filename);
      goto err;
    }
    if (filecopy(param, new_file,info->dfile,0L,new_header_length,
		 "datafile-header"))
      goto err;
    if (param->testflag & T_UNPACK)
    {
      share->options&= ~HA_OPTION_COMPRESS_RECORD;
      mi_int2store(share->state.header.options,share->options);
    }
    share->state.dellink= HA_OFFSET_ERROR;
    info->rec_cache.file=new_file;
  }

  info->update= (short) (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
  if (!(param->testflag & T_CREATE_MISSING_KEYS))
  {
    /*
      Flush key cache for this file if we are calling this outside
      myisamchk
    */
    flush_key_blocks(share->kfile, FLUSH_IGNORE_CHANGED);
    /* Clear the pointers to the given rows */
    for (i=0 ; i < share->base.keys ; i++)
      share->state.key_root[i]= HA_OFFSET_ERROR;
    for (i=0 ; i < share->state.header.max_block_size ; i++)
      share->state.key_del[i]=  HA_OFFSET_ERROR;
    info->state->key_file_length=share->base.keystart;
  }
  else
  {
    if (flush_key_blocks(share->kfile, FLUSH_FORCE_WRITE))
      goto err;
    key_map= ~key_map;				/* Create the missing keys */
  }

  sort_info->info=info;
  sort_info->param = param;

  if ((sort_info->new_data_file_type=share->data_file_type) ==
      COMPRESSED_RECORD && param->testflag & T_UNPACK)
  {
    if (share->options & HA_OPTION_PACK_RECORD)
      sort_info->new_data_file_type = DYNAMIC_RECORD;
    else
      sort_info->new_data_file_type = STATIC_RECORD;
  }

  sort_info->filepos=new_header_length;
  sort_info->dupp=0;
  sort_info->buff=0;
  param->read_cache.end_of_file=sort_info->filelength=
    my_seek(param->read_cache.file,0L,MY_SEEK_END,MYF(0));

  if (share->data_file_type == DYNAMIC_RECORD)
    length=max(share->base.min_pack_length+1,share->base.min_block_length);
  else if (share->data_file_type == COMPRESSED_RECORD)
    length=share->base.min_block_length;
  else
    length=share->base.pack_reclength;
  sort_param.max_records=sort_info->max_records=
    ((param->testflag & T_TRUST_HEADER) ? info->state->records :
     (ha_rows) (sort_info->filelength/length+1));
  sort_param.key_cmp=sort_key_cmp;
  sort_param.key_write=sort_key_write;
  sort_param.key_read=sort_key_read;
  sort_param.lock_in_memory=lock_memory;
  sort_param.tmpdir=param->tmpdir;
  sort_param.myf_rw=param->myf_rw;
  sort_param.sort_info=sort_info;

  del=info->state->del;
  if (sort_info->new_data_file_type != COMPRESSED_RECORD &&
      ! rep_quick)
    share->state.checksum=0;

  rec_per_key_part= param->rec_per_key_part;
  for (sort_info->key=0 ; sort_info->key < share->base.keys ;
       rec_per_key_part+=sort_info->keyinfo->keysegs, sort_info->key++)
  {
    sort_info->keyinfo=share->keyinfo+sort_info->key;
    if (!(((ulonglong) 1 << sort_info->key) & key_map))
    {
      /* Remember old statistics for key */
      memcpy((char*) rec_per_key_part,
	     (char*) share->state.rec_per_key_part+
	     (uint) (rec_per_key_part - param->rec_per_key_part),
	     sort_info->keyinfo->keysegs*sizeof(*rec_per_key_part));
      continue;
    }

    if ((!(param->testflag & T_SILENT)))
      printf ("- Fixing index %d\n",sort_info->key+1);
    sort_info->max_pos=sort_info->pos=share->pack.header_length;
    sort_info->keyseg=sort_info->keyinfo->seg;
    sort_info->fix_datafile= (my_bool) (sort_info->key == 0 && ! rep_quick);
    bzero((char*) sort_info->unique,sizeof(sort_info->unique));
    sort_param.key_length=share->rec_reflength;
    for (i=0 ; sort_info->keyseg[i].type != HA_KEYTYPE_END; i++)
    {
      sort_param.key_length+=sort_info->keyseg[i].length;
      if (sort_info->keyseg[i].flag & HA_SPACE_PACK)
	sort_param.key_length+=get_pack_length(sort_info->keyseg[i].length);
      if (sort_info->keyseg[i].flag & (HA_BLOB_PART | HA_VAR_LENGTH))
	sort_param.key_length+=2 + test(sort_info->keyseg[i].length >= 127);
      if (sort_info->keyseg[i].flag & HA_NULL_PART)
	sort_param.key_length++;
    }
    info->state->records=info->state->del=share->state.split=0;
    info->state->empty=0;

    if (_create_index_by_sort(&sort_param,
			      (my_bool) (!(param->testflag & T_VERBOSE)),
			      (uint) param->sort_buffer_length))
    {
      param->retry_repair=1;
      goto err;
    }

    /* Set for next loop */
    sort_param.max_records=sort_info->max_records=
      (ha_rows) info->state->records;

    if (param->testflag & T_STATISTICS)
      update_key_parts(sort_info->keyinfo, rec_per_key_part, sort_info->unique,
		       (ulonglong) info->state->records);
    share->state.key_map|=(ulonglong) 1 << sort_info->key;

    if (sort_info->fix_datafile)
    {
      param->read_cache.end_of_file=sort_info->filepos;
      if (write_data_suffix(param,info) || end_io_cache(&info->rec_cache))
	goto err;
      if (param->testflag & T_SAFE_REPAIR)
      {
	/* Don't repair if we loosed more than one row */
	if (info->state->records+1 < start_records)
	{
	  info->state->records=start_records;
	  goto err;
	}
      }
      share->state.state.data_file_length = info->state->data_file_length
	= sort_info->filepos;
      /* Only whole records */
      share->state.split=info->state->records+info->state->del;
      share->state.version=(ulong) time((time_t*) 0);
      param->out_flag|=O_NEW_DATA;		/* Data in new file */
      my_close(info->dfile,MYF(0));
      info->dfile=new_file;
      share->data_file_type=sort_info->new_data_file_type;
      share->pack.header_length=(ulong) new_header_length;
    }
    else
      info->state->data_file_length=sort_info->max_pos;

    if (flush_pending_blocks(param))
      goto err;

    param->read_cache.file=info->dfile;		/* re-init read cache */
    reinit_io_cache(&param->read_cache,READ_CACHE,share->pack.header_length,1,
		    1);
  }

  if (param->testflag & T_WRITE_LOOP)
  {
    VOID(fputs("          \r",stdout)); VOID(fflush(stdout));
  }

  if (rep_quick && del+sort_info->dupp != info->state->del)
  {
    mi_check_print_error(param,"Couldn't fix table with quick recovery: Found wrong number of deleted records");
    mi_check_print_error(param,"Run recovery again without -q");
    got_error=1;
    param->retry_repair=param->retry_without_quick=1;
    goto err;
  }

  if (rep_quick != 1)
  {
    my_off_t skr=info->state->data_file_length+
      (share->options & HA_OPTION_COMPRESS_RECORD ?
       MEMMAP_EXTRA_MARGIN : 0);
#ifdef USE_RELOC
    if (share->data_file_type == STATIC_RECORD &&
	skr < share->base.reloc*share->base.min_pack_length)
      skr=share->base.reloc*share->base.min_pack_length;
#endif
    if (skr != sort_info->filelength && !info->s->base.raid_type)
      if (my_chsize(info->dfile,skr,MYF(0)))
	mi_check_print_warning(param,
			       "Can't change size of datafile,  error: %d",
			       my_errno);
  }
  if (my_chsize(share->kfile,info->state->key_file_length,MYF(0)))
    mi_check_print_warning(param,
			   "Can't change size of indexfile, error: %d",
			   my_errno);

  if (!(param->testflag & T_SILENT))
  {
    if (start_records != info->state->records)
      printf("Data records: %s\n", llstr(info->state->records,llbuff));
    if (sort_info->dupp)
      mi_check_print_warning(param,
			     "%s records have been removed",
			     llstr(sort_info->dupp,llbuff));
  }
  got_error=0;

  if (&share->state.state != info->state)
    memcpy( &share->state.state, info->state, sizeof(*info->state));

err:
  if (got_error)
  {
    if (! param->error_printed)
      mi_check_print_error(param,"%d when fixing table",my_errno);
    if (new_file >= 0)
    {
      VOID(end_io_cache(&info->rec_cache));
      VOID(my_close(new_file,MYF(0)));
      VOID(my_raid_delete(param->temp_filename,info->s->base.raid_chunks,
			  MYF(MY_WME)));
      if (info->dfile == new_file)
	info->dfile=0;
    }
    mi_mark_crashed_on_repair(info);
  }
  else if (key_map == share->state.key_map)
    share->state.changed&= ~STATE_NOT_OPTIMIZED_KEYS;
  share->state.changed|=STATE_NOT_SORTED_PAGES;

  my_free((gptr) sort_info->key_block,MYF(MY_ALLOW_ZERO_PTR));
  my_free(sort_info->record,MYF(MY_ALLOW_ZERO_PTR));
  my_free(sort_info->buff,MYF(MY_ALLOW_ZERO_PTR));
  VOID(end_io_cache(&param->read_cache));
  VOID(end_io_cache(&info->rec_cache));
  info->opt_flag&= ~(READ_CACHE_USED | WRITE_CACHE_USED);
  if (!got_error && (param->testflag & T_UNPACK))
  {
    share->state.header.options[0]&= (uchar) ~HA_OPTION_COMPRESS_RECORD;
    share->pack.header_length=0;
  }
  DBUG_RETURN(got_error);
}


	/* Read next record and return next key */

static int sort_key_read(SORT_INFO *sort_info, void *key)
{
  int error;
  MI_INFO *info;
  DBUG_ENTER("sort_key_read");

  info=sort_info->info;

  if ((error=sort_get_next_record(sort_info)))
    DBUG_RETURN(error);
  if (info->state->records == sort_info->max_records)
  {
    mi_check_print_error(sort_info->param,
			 "Found too many records; Can`t continue");
    DBUG_RETURN(1);
  }
  /* Hmm, repair_by_sort uses find_all_keys, and find_all_keys strictly
     implies "one row - one key per keynr", while for ft_key one row/keynr
     can produce as many keys as the number of unique words in the text
     that's why I disabled repair_by_sort for ft-keys. (serg)
   */
  if (sort_info->keyinfo->flag & HA_FULLTEXT )
  {
    mi_check_print_error(sort_info->param,
    			 "Can`t use repair_by_sort with FULLTEXT key");
    DBUG_RETURN(1);
  }
  else
  {
    VOID(_mi_make_key(info,sort_info->key,key,sort_info->record,
                      sort_info->filepos));
  }
  DBUG_RETURN(sort_write_record(sort_info));
} /* sort_key_read */


	/* Read next record from file using parameters in sort_info */
	/* Return -1 if end of file, 0 if ok and > 0 if error */

static int sort_get_next_record(SORT_INFO *sort_info)
{
  int searching;
  uint found_record,b_type,left_length;
  my_off_t pos;
  byte *to;
  MI_BLOCK_INFO block_info;
  MI_INFO *info;
  MYISAM_SHARE *share;
  MI_CHECK *param=sort_info->param;
  char llbuff[22],llbuff2[22];
  DBUG_ENTER("sort_get_next_record");

  info=sort_info->info;
  share=info->s;
  switch (share->data_file_type) {
  case STATIC_RECORD:
    for (;;)
    {
      if (my_b_read(&param->read_cache,sort_info->record,
		    share->base.pack_reclength))
      {
	if (param->read_cache.error)
	  param->out_flag |= O_DATA_LOST;
	DBUG_RETURN(-1);
      }
      sort_info->start_recpos=sort_info->pos;
      if (!sort_info->fix_datafile)
	sort_info->filepos=sort_info->pos;
      sort_info->max_pos=(sort_info->pos+=share->base.pack_reclength);
      share->state.split++;
      if (*sort_info->record)
	DBUG_RETURN(0);
      if (!sort_info->fix_datafile)
      {
	info->state->del++;
	info->state->empty+=share->base.pack_reclength;
      }
    }
  case DYNAMIC_RECORD:
    LINT_INIT(to);
    pos=sort_info->pos;
    searching=(sort_info->fix_datafile && (param->testflag & T_EXTEND));
    for (;;)
    {
      found_record=block_info.second_read= 0;
      left_length=1;
      if (searching)
	pos=MY_ALIGN(pos,MI_DYN_ALIGN_SIZE);
      do
      {
	if (pos > sort_info->max_pos)
	  sort_info->max_pos=pos;
	if (pos & (MI_DYN_ALIGN_SIZE-1))
	{
	  if ((param->testflag & T_VERBOSE) || searching == 0)
	  {
	    mi_check_print_info(param,"Wrong aligned block at %s",
				llstr(pos,llbuff));
	    goto try_next;
	  }
	}
	if (found_record && pos == param->search_after_block)
	  mi_check_print_info(param,"Block: %s used by record at %s",
		     llstr(param->search_after_block,llbuff),
		     llstr(sort_info->start_recpos,llbuff2));
	if (_mi_read_cache(&param->read_cache,(byte*) block_info.header,pos,
			  MI_BLOCK_INFO_HEADER_LENGTH,
			   test(! found_record) | 2))
	{
	  if (found_record)
	  {
	    mi_check_print_info(param,
				"Can't read whole record at %s (errno: %d)",
				llstr(sort_info->start_recpos,llbuff),errno);
	    goto try_next;
	  }
	  DBUG_RETURN(-1);
	}
	if (searching && ! sort_info->fix_datafile)
	{
	  param->error_printed=1;
	  DBUG_RETURN(1);	/* Something wrong with data */
	}
	if (((b_type=_mi_get_block_info(&block_info,-1,pos)) &
	     (BLOCK_ERROR | BLOCK_FATAL_ERROR)) ||
	    ((b_type & BLOCK_FIRST) &&
	     (block_info.rec_len < (uint) share->base.min_pack_length ||
	      block_info.rec_len > (uint) share->base.max_pack_length)))
	{
	  uint i;
	  if (param->testflag & T_VERBOSE || searching == 0)
	    mi_check_print_info(param,
				"Wrong bytesec: %3d-%3d-%3d at %10s; Skipped",
		       block_info.header[0],block_info.header[1],
		       block_info.header[2],llstr(pos,llbuff));
	  if (found_record)
	    goto try_next;
	  block_info.second_read=0;
	  searching=1;
	  /* Search after block in read header string */
	  for (i=MI_DYN_ALIGN_SIZE ;
	       i < MI_BLOCK_INFO_HEADER_LENGTH ;
	       i+= MI_DYN_ALIGN_SIZE)
	    if (block_info.header[i] >= 1 &&
		block_info.header[i] <= MI_MAX_DYN_HEADER_BYTE)
	      break;
	  pos+=(ulong) i;
	  continue;
	}
	if (b_type & BLOCK_DELETED)
	{
	  bool error=0;
	  if (block_info.block_len+ (uint) (block_info.filepos-pos) <
	      share->base.min_block_length)
	  {
	    if (!searching)
	      mi_check_print_info(param,
				  "Deleted block with impossible length %u at %s",
				  block_info.block_len,llstr(pos,llbuff));
	    error=1;
	  }
	  else
	  {
	    if ((block_info.next_filepos != HA_OFFSET_ERROR &&
		 block_info.next_filepos >=
		 info->state->data_file_length) ||
		(block_info.prev_filepos != HA_OFFSET_ERROR &&
		 block_info.prev_filepos >= info->state->data_file_length))
	    {
	      if (!searching)
		mi_check_print_info(param,
				    "Delete link points outside datafile at %s",
				    llstr(pos,llbuff));
	      error=1;
	    }
	  }
	  if (error)
	  {
	    if (found_record)
	      goto try_next;
	    searching=1;
	    pos++;
	    block_info.second_read=0;
	    continue;
	  }
	}
	else
	{
	  if (block_info.block_len+ (uint) (block_info.filepos-pos) <
	      share->base.min_block_length ||
	      block_info.block_len > (uint) share->base.max_pack_length+
	      MI_SPLIT_LENGTH)
	  {
	    if (!searching)
	      mi_check_print_info(param,
				  "Found block with impossible length %u at %s; Skipped",
				  block_info.block_len+ (uint) (block_info.filepos-pos),
				  llstr(pos,llbuff));
	    if (found_record)
	      goto try_next;
	    searching=1;
	    pos++;
	    block_info.second_read=0;
	    continue;
	  }
	}
	if (b_type & (BLOCK_DELETED | BLOCK_SYNC_ERROR))
	{
	  if (!sort_info->fix_datafile && (b_type & BLOCK_DELETED))
	  {
	    info->state->empty+=block_info.block_len;
	    info->state->del++;
	    share->state.split++;
	  }
	  if (found_record)
	    goto try_next;
	  if (searching)
	    pos++;
	  else
	    pos=block_info.filepos+block_info.block_len;
	  block_info.second_read=0;
	  continue;
	}

	share->state.split++;
	if (! found_record++)
	{
	  sort_info->find_length=left_length=block_info.rec_len;
	  sort_info->start_recpos=pos;
	  if (!sort_info->fix_datafile)
	    sort_info->filepos=sort_info->start_recpos;
	  if (sort_info->fix_datafile && (param->testflag & T_EXTEND))
	    sort_info->pos=block_info.filepos+1;
	  else
	    sort_info->pos=block_info.filepos+block_info.block_len;
	  if (share->base.blobs)
	  {
	    if (!(to=mi_fix_rec_buff_for_blob(info,block_info.rec_len)))
	    {
	      mi_check_print_error(param,"Not enough memory for blob at %s",
			  llstr(sort_info->start_recpos,llbuff));
	      DBUG_RETURN(-1);
	    }
	  }
	  else
	    to= info->rec_buff;
	}
	if (left_length < block_info.data_len || ! block_info.data_len)
	{
	  mi_check_print_info(param,"Found block with too small length at %s; Skipped",
		     llstr(sort_info->start_recpos,llbuff));
	  goto try_next;
	}
	if (block_info.filepos + block_info.data_len >
	    param->read_cache.end_of_file)
	{
	  mi_check_print_info(param,"Found block that points outside data file at %s",
			      llstr(sort_info->start_recpos,llbuff));
	  goto try_next;
	}
	if (_mi_read_cache(&param->read_cache,to,block_info.filepos,
			   block_info.data_len, test(found_record == 1)))
	{
	  mi_check_print_info(param,"Read error for block at: %s (error: %d); Skipped",
			      llstr(block_info.filepos,llbuff),my_errno);
	  goto try_next;
	}
	left_length-=block_info.data_len;
	to+=block_info.data_len;
	pos=block_info.next_filepos;
	if (pos == HA_OFFSET_ERROR && left_length)
	{
	  mi_check_print_info(param,"Wrong block with wrong total length starting at %s",
			      llstr(sort_info->start_recpos,llbuff));
	  goto try_next;
	}
	if (pos + MI_BLOCK_INFO_HEADER_LENGTH > param->read_cache.end_of_file)
	{
	  mi_check_print_info(param,"Found link that points at %s (outside data file) at %s",
			      llstr(pos,llbuff2),
			      llstr(sort_info->start_recpos,llbuff));
	  goto try_next;
	}
      } while (left_length);

      if (_mi_rec_unpack(info,sort_info->record,info->rec_buff,
			 sort_info->find_length) != MY_FILE_ERROR)
      {
	if (param->read_cache.error < 0)
	  DBUG_RETURN(1);
	if ((param->testflag & (T_EXTEND | T_REP)) || searching)
	{
	  if (info->s->calc_checksum)
	    info->checksum=mi_checksum(info,sort_info->record);
	  if (_mi_rec_check(info, sort_info->record))
	  {
	    mi_check_print_info(param,"Found wrong packed record at %s",
				llstr(sort_info->start_recpos,llbuff));
	    goto try_next;
	  }
	}
	DBUG_RETURN(0);
      }
    try_next:
      pos=(sort_info->start_recpos+=MI_DYN_ALIGN_SIZE);
      searching=1;
    }
  case COMPRESSED_RECORD:
    for (searching=0 ;; searching=1, sort_info->pos++)
    {
      if (_mi_read_cache(&param->read_cache,(byte*) block_info.header,sort_info->pos,
			share->pack.ref_length,1))
	DBUG_RETURN(-1);
      if (searching && ! sort_info->fix_datafile)
      {
	param->error_printed=1;
	DBUG_RETURN(1);		/* Something wrong with data */
      }
      sort_info->start_recpos=sort_info->pos;
      if (_mi_pack_get_block_info(info,&block_info,-1,sort_info->pos, NullS))
	DBUG_RETURN(-1);
      if (!block_info.rec_len &&
	  sort_info->pos + MEMMAP_EXTRA_MARGIN ==
	  param->read_cache.end_of_file)
	DBUG_RETURN(-1);
      if (block_info.rec_len < (uint) share->min_pack_length ||
	  block_info.rec_len > (uint) share->max_pack_length)
      {
	if (! searching)
	  mi_check_print_info(param,"Found block with wrong recordlength: %d at %s\n",
			      block_info.rec_len,
			      llstr(sort_info->pos,llbuff));
	continue;
      }
      if (_mi_read_cache(&param->read_cache,(byte*) info->rec_buff,
			block_info.filepos, block_info.rec_len,1))
      {
	if (! searching)
	  mi_check_print_info(param,"Couldn't read hole record from %s",
			      llstr(sort_info->pos,llbuff));
	continue;
      }
      if (_mi_pack_rec_unpack(info,sort_info->record,info->rec_buff,
			      block_info.rec_len))
      {
	if (! searching)
	  mi_check_print_info(param,"Found wrong record at %s",
			      llstr(sort_info->pos,llbuff));
	continue;
      }
      if (!sort_info->fix_datafile)
	sort_info->filepos=sort_info->pos;
      sort_info->max_pos=(sort_info->pos=block_info.filepos+
			 block_info.rec_len);
      share->state.split++;
      info->packed_length=block_info.rec_len;
      DBUG_RETURN(0);
    }
  }
  DBUG_RETURN(1);		/* Impossible */
}


	/* Write record to new file */

int sort_write_record(SORT_INFO *sort_info)
{
  int flag;
  uint length;
  ulong block_length,reclength;
  byte *from;
  byte block_buff[8];
  MI_INFO *info;
  MYISAM_SHARE *share;
  MI_CHECK *param=sort_info->param;
  DBUG_ENTER("sort_write_record");

  info=sort_info->info;
  share=info->s;
  if (sort_info->fix_datafile)
  {
    switch (sort_info->new_data_file_type) {
    case STATIC_RECORD:
      if (my_b_write(&info->rec_cache,sort_info->record,
		     share->base.pack_reclength))
      {
	mi_check_print_error(param,"%d when writing to datafile",my_errno);
	DBUG_RETURN(1);
      }
      sort_info->filepos+=share->base.pack_reclength;
      info->s->state.checksum+=mi_static_checksum(info, sort_info->record);
      break;
    case DYNAMIC_RECORD:
      if (! info->blobs)
	from=info->rec_buff;
      else
      {
	/* must be sure that local buffer is big enough */
	reclength=info->s->base.pack_reclength+
	  _my_calc_total_blob_length(info,sort_info->record)+
	  ALIGN_SIZE(MI_MAX_DYN_BLOCK_HEADER)+MI_SPLIT_LENGTH+
	  MI_DYN_DELETE_BLOCK_HEADER;
	if (sort_info->buff_length < reclength)
	{
	  if (!(sort_info->buff=my_realloc(sort_info->buff, (uint) reclength,
					  MYF(MY_FREE_ON_ERROR |
					      MY_ALLOW_ZERO_PTR))))
	    DBUG_RETURN(1);
	  sort_info->buff_length=reclength;
	}
	from=sort_info->buff+ALIGN_SIZE(MI_MAX_DYN_BLOCK_HEADER);
      }
      info->checksum=mi_checksum(info,sort_info->record);
      reclength=_mi_rec_pack(info,from,sort_info->record);
      info->s->state.checksum+=info->checksum;
      block_length=reclength+ 3 +test(reclength > 65532L);
      if (block_length < share->base.min_block_length)
	block_length=share->base.min_block_length;
      flag=0;
      info->update|=HA_STATE_WRITE_AT_END;
      block_length=MY_ALIGN(block_length,MI_DYN_ALIGN_SIZE);
      if (_mi_write_part_record(info,0L,block_length,HA_OFFSET_ERROR,
				&from,&reclength,&flag))
      {
	mi_check_print_error(param,"%d when writing to datafile",my_errno);
	DBUG_RETURN(1);
      }
      sort_info->filepos+=block_length;
      break;
    case COMPRESSED_RECORD:
      reclength=info->packed_length;
      length=save_pack_length(block_buff,reclength);
      if (info->s->base.blobs)
	length+=save_pack_length(block_buff+length,info->blob_length);
      if (my_b_write(&info->rec_cache,block_buff,length) ||
	  my_b_write(&info->rec_cache,(byte*) info->rec_buff,reclength))
      {
	mi_check_print_error(param,"%d when writing to datafile",my_errno);
	DBUG_RETURN(1);
      }
      sort_info->filepos+=reclength+length;
      break;
    }
  }
  info->state->records++;
  if ((param->testflag & T_WRITE_LOOP) &&
      (info->state->records % WRITE_COUNT) == 0)
  {
    char llbuff[22];
    printf("%s\r", llstr(info->state->records,llbuff)); VOID(fflush(stdout));
  }
  DBUG_RETURN(0);
} /* sort_write_record */


	/* Compare two keys from _create_index_by_sort */

static int sort_key_cmp(SORT_INFO *sort_info, const void *a, const void *b)
{
  uint not_used;
  return (_mi_key_cmp(sort_info->keyseg,*((uchar**) a),*((uchar**) b),
		      USE_WHOLE_KEY, SEARCH_SAME,&not_used));
} /* sort_key_cmp */


static int sort_key_write(SORT_INFO *sort_info, const void *a)
{
  uint diff_pos;
  char llbuff[22],llbuff2[22];
  MI_CHECK *param= sort_info->param;
  int cmp;

  if (sort_info->key_block->inited)
  {
    cmp=_mi_key_cmp(sort_info->keyseg,sort_info->key_block->lastkey,(uchar*) a,
		    USE_WHOLE_KEY,SEARCH_FIND | SEARCH_UPDATE ,&diff_pos);
  }
  else
  {
    cmp= -1;  diff_pos=sort_info->keyinfo->keysegs;
  }
  if ((sort_info->keyinfo->flag & HA_NOSAME) && cmp == 0)
  {
    sort_info->dupp++;
    sort_info->info->lastpos=get_record_for_key(sort_info->info,
					       sort_info->keyinfo,
					       (uchar*) a);
    mi_check_print_warning(param,
			   "Duplicate key for record at %10s against record at %10s",
			   llstr(sort_info->info->lastpos,llbuff),
			   llstr(get_record_for_key(sort_info->info,
						    sort_info->keyinfo,
						    sort_info->key_block->
						    lastkey),
				 llbuff2));
    if (sort_info->param->testflag & T_VERBOSE)
      _mi_print_key(stdout,sort_info->keyseg,(uchar*) a, USE_WHOLE_KEY);
    return (sort_delete_record(param));
  }
  sort_info->unique[diff_pos-1]++;
#ifndef DBUG_OFF
  if (cmp > 0)
  {
    mi_check_print_error(param,
			 "Internal error: Keys are not in order from sort");
    return(1);
  }
#endif
  return (sort_insert_key(param,sort_info->key_block,(uchar*) a,
			  HA_OFFSET_ERROR));
} /* sort_key_write */


	/* get pointer to record from a key */

static my_off_t get_record_for_key(MI_INFO *info, MI_KEYDEF *keyinfo,
				   uchar *key)
{
  return _mi_dpos(info,0,key+_mi_keylength(keyinfo,key));
} /* get_record_for_key */


	/* Insert a key in sort-key-blocks */

static int sort_insert_key(MI_CHECK *param,
			   register SORT_KEY_BLOCKS *key_block, uchar *key,
			   my_off_t prev_block)
{
  uint a_length,t_length,nod_flag;
  my_off_t filepos;
  uchar *anc_buff,*lastkey;
  MI_KEY_PARAM s_temp;
  MI_INFO *info;
  SORT_INFO *sort_info= &param->sort_info;
  DBUG_ENTER("sort_insert_key");

  anc_buff=key_block->buff;
  info=sort_info->info;
  lastkey=key_block->lastkey;
  nod_flag= (key_block == sort_info->key_block ? 0 :
	     sort_info->info->s->base.key_reflength);

  if (!key_block->inited)
  {
    key_block->inited=1;
    if (key_block == sort_info->key_block_end)
    {
      mi_check_print_error(param,"To many key-block-levels; Try increasing sort_key_blocks");
      DBUG_RETURN(1);
    }
    a_length=2+nod_flag;
    key_block->end_pos=anc_buff+2;
    lastkey=0;					/* No previous key in block */
  }
  else
    a_length=mi_getint(anc_buff);

	/* Save pointer to previous block */
  if (nod_flag)
    _mi_kpointer(info,key_block->end_pos,prev_block);

  t_length=(*sort_info->keyinfo->pack_key)(sort_info->keyinfo,nod_flag,
					  (uchar*) 0,lastkey,lastkey,key,
					  &s_temp);
  (*sort_info->keyinfo->store_key)(sort_info->keyinfo,
				  key_block->end_pos+nod_flag,&s_temp);
  a_length+=t_length;
  mi_putint(anc_buff,a_length,nod_flag);
  key_block->end_pos+=t_length;
  if (a_length <= sort_info->keyinfo->block_length)
  {
    VOID(_mi_move_key(sort_info->keyinfo,key_block->lastkey,key));
    key_block->last_length=a_length-t_length;
    DBUG_RETURN(0);
  }

	/* Fill block with end-zero and write filled block */
  mi_putint(anc_buff,key_block->last_length,nod_flag);
  bzero((byte*) anc_buff+key_block->last_length,
	sort_info->keyinfo->block_length- key_block->last_length);
  if ((filepos=_mi_new(info,sort_info->keyinfo)) == HA_OFFSET_ERROR)
    return 1;
  if (my_pwrite(info->s->kfile,(byte*) anc_buff,
		(uint) sort_info->keyinfo->block_length,filepos,
		param->myf_rw))
    DBUG_RETURN(1);
  DBUG_DUMP("buff",(byte*) anc_buff,mi_getint(anc_buff));

	/* Write separator-key to block in next level */
  if (sort_insert_key(param,key_block+1,key_block->lastkey,filepos))
    DBUG_RETURN(1);

	/* clear old block and write new key in it */
  key_block->inited=0;
  DBUG_RETURN(sort_insert_key(param, key_block,key,prev_block));
} /* sort_insert_key */


	/* Delete record when we found a duplicated key */

static int sort_delete_record(MI_CHECK *param)
{
  uint i;
  int old_file,error;
  uchar *key;
  MI_INFO *info;
  SORT_INFO *sort_info= &param->sort_info;
  DBUG_ENTER("sort_delete_record");

  if (param->opt_rep_quick == 1)
  {
    mi_check_print_error(param,
			 "Quick-recover aborted; Run recovery without switch 'q' or with switch -qq");
    DBUG_RETURN(1);
  }
  info=sort_info->info;
  if (info->s->options & HA_OPTION_COMPRESS_RECORD)
  {
    mi_check_print_error(param,
			 "Recover aborted; Can't run standard recovery on compressed tables with errors in data-file. Use switch 'myisamchk --safe-recover' to fix it\n",stderr);;
    DBUG_RETURN(1);
  }

  old_file=info->dfile;
  info->dfile=info->rec_cache.file;
  if (sort_info->key)
  {
    key=info->lastkey+info->s->base.max_key_length;
    if ((error=(*info->s->read_rnd)(info,sort_info->record,info->lastpos,0)) &&
	error != HA_ERR_RECORD_DELETED)
    {
      mi_check_print_error(param,"Can't read record to be removed");
      info->dfile=old_file;
      DBUG_RETURN(1);
    }

    for (i=0 ; i < sort_info->key ; i++)
    {
      uint key_length=_mi_make_key(info,i,key,sort_info->record,info->lastpos);
      if (_mi_ck_delete(info,i,key,key_length))
      {
	mi_check_print_error(param,"Can't delete key %d from record to be removed",i+1);
	info->dfile=old_file;
	DBUG_RETURN(1);
      }
    }
    if (info->s->calc_checksum)
      info->s->state.checksum-=(*info->s->calc_checksum)(info,
							 sort_info->record);
  }
  error=flush_io_cache(&info->rec_cache) || (*info->s->delete_record)(info);
  info->dfile=old_file;				/* restore actual value */
  info->state->records--;
  DBUG_RETURN(error);
} /* sort_delete_record */


	/* Fix all pending blocks and flush everything to disk */

static int flush_pending_blocks(MI_CHECK *param)
{
  uint nod_flag,length;
  my_off_t filepos;
  MI_INFO *info;
  SORT_KEY_BLOCKS *key_block;
  SORT_INFO *sort_info= &param->sort_info;
  DBUG_ENTER("flush_pending_blocks");

  filepos= HA_OFFSET_ERROR;			/* if empty file */
  info=sort_info->info;
  nod_flag=0;
  for (key_block=sort_info->key_block ; key_block->inited ; key_block++)
  {
    key_block->inited=0;
    length=mi_getint(key_block->buff);
    if (nod_flag)
      _mi_kpointer(info,key_block->end_pos,filepos);
    if ((filepos=_mi_new(info,sort_info->keyinfo)) == HA_OFFSET_ERROR)
      DBUG_RETURN(1);
    bzero((byte*) key_block->buff+length,
	  sort_info->keyinfo->block_length-length);
    if (my_pwrite(info->s->kfile,(byte*) key_block->buff,
		 (uint) sort_info->keyinfo->block_length,filepos,
                 param->myf_rw))
      DBUG_RETURN(1);
    DBUG_DUMP("buff",(byte*) key_block->buff,length);
    nod_flag=1;
  }
  info->s->state.key_root[sort_info->key]=filepos;	/* Last is root for tree */
  DBUG_RETURN(0);
} /* flush_pending_blocks */


	/* alloc space and pointers for key_blocks */

static SORT_KEY_BLOCKS *alloc_key_blocks(MI_CHECK *param, uint blocks,
                                         uint buffer_length)
{
  reg1 uint i;
  SORT_KEY_BLOCKS *block;
  DBUG_ENTER("alloc_key_blocks");

  if (!(block=(SORT_KEY_BLOCKS*) my_malloc((sizeof(SORT_KEY_BLOCKS)+
					    buffer_length+IO_SIZE)*blocks,
					   MYF(0))))
  {
    mi_check_print_error(param,"Not Enough memory for sort-key-blocks");
    return(0);
  }
  for (i=0 ; i < blocks ; i++)
  {
    block[i].inited=0;
    block[i].buff=(uchar*) (block+blocks)+(buffer_length+IO_SIZE)*i;
  }
  DBUG_RETURN(block);
} /* alloc_key_blocks */


	/* Check if file is almost full */

int test_if_almost_full(MI_INFO *info)
{
  if (info->s->options & HA_OPTION_COMPRESS_RECORD)
    return 0;
  return (my_seek(info->s->kfile,0L,MY_SEEK_END,MYF(0))/10*9 >
	  (my_off_t) (info->s->base.max_key_file_length) ||
	  my_seek(info->dfile,0L,MY_SEEK_END,MYF(0))/10*9 >
	  (my_off_t) info->s->base.max_data_file_length);
}

	/* Recreate table with bigger more alloced record-data */

int recreate_table(MI_CHECK *param, MI_INFO **org_info, char *filename)
{
  int error;
  MI_INFO info;
  MYISAM_SHARE share;
  MI_KEYDEF *keyinfo,*key,*key_end;
  MI_KEYSEG *keysegs,*keyseg;
  MI_COLUMNDEF *recdef,*rec,*end;
  MI_UNIQUEDEF *uniquedef,*u_ptr,*u_end;
  MI_STATUS_INFO status_info;
  uint unpack,key_parts;
  ha_rows max_records;
  char name[FN_REFLEN];
  ulonglong file_length,tmp_length;
  MI_CREATE_INFO create_info;

  error=1;					/* Default error */
  info= **org_info;
  status_info= (*org_info)->state[0];
  info.state= &status_info;
  share= *(*org_info)->s;
  unpack= (share.options & HA_OPTION_COMPRESS_RECORD) &&
    (param->testflag & T_UNPACK);
  if (!(keyinfo=(MI_KEYDEF*) my_alloca(sizeof(MI_KEYDEF)*share.base.keys)))
    return 0;
  memcpy((byte*) keyinfo,(byte*) share.keyinfo,
	 (size_t) (sizeof(MI_KEYDEF)*share.base.keys));

  key_parts= share.base.all_key_parts;
  if (!(keysegs=(MI_KEYSEG*) my_alloca(sizeof(MI_KEYSEG)*
				       (key_parts+share.base.keys))))
  {
    my_afree((gptr) keyinfo);
    return 1;
  }
  if (!(recdef=(MI_COLUMNDEF*)
	my_alloca(sizeof(MI_COLUMNDEF)*(share.base.fields+1))))
  {
    my_afree((gptr) keyinfo);
    my_afree((gptr) keysegs);
    return 1;
  }
  if (!(uniquedef=(MI_UNIQUEDEF*)
	my_alloca(sizeof(MI_UNIQUEDEF)*(share.state.header.uniques+1))))
  {
    my_afree((gptr) recdef);
    my_afree((gptr) keyinfo);
    my_afree((gptr) keysegs);
    return 1;
  }

  /* Copy the column definitions */
  memcpy((byte*) recdef,(byte*) share.rec,
	 (size_t) (sizeof(MI_COLUMNDEF)*(share.base.fields+1)));
  for (rec=recdef,end=recdef+share.base.fields; rec != end ; rec++)
  {
    if (unpack && !(share.options & HA_OPTION_PACK_RECORD) &&
	rec->type != FIELD_BLOB &&
	rec->type != FIELD_VARCHAR &&
	rec->type != FIELD_CHECK)
      rec->type=(int) FIELD_NORMAL;
  }

  /* Change the new key to point at the saved key segments */
  memcpy((byte*) keysegs,(byte*) share.keyparts,
	 (size_t) (sizeof(MI_KEYSEG)*(key_parts+share.base.keys+
				      share.state.header.uniques)));
  keyseg=keysegs;
  for (key=keyinfo,key_end=keyinfo+share.base.keys; key != key_end ; key++)
  {
    key->seg=keyseg;
    for (; keyseg->type ; keyseg++)
    {
      if (param->language)
	keyseg->language=param->language;	/* change language */
    }
    keyseg++;					/* Skipp end pointer */
  }

  /* Copy the unique definitions and change them to point at the new key
     segments*/
  memcpy((byte*) uniquedef,(byte*) share.uniqueinfo,
	 (size_t) (sizeof(MI_UNIQUEDEF)*(share.state.header.uniques)));
  for (u_ptr=uniquedef,u_end=uniquedef+share.state.header.uniques;
       u_ptr != u_end ; u_ptr++)
  {
    u_ptr->seg=keyseg;
    keyseg+=u_ptr->keysegs+1;
  }
  if (share.options & HA_OPTION_COMPRESS_RECORD)
    share.base.records=max_records=info.state->records;
  else if (share.base.min_pack_length)
    max_records=(ha_rows) (my_seek(info.dfile,0L,MY_SEEK_END,MYF(0)) /
			   (ulong) share.base.min_pack_length);
  else
    max_records=0;
  unpack= (share.options & HA_OPTION_COMPRESS_RECORD) &&
    (param->testflag & T_UNPACK);
  share.options&= ~HA_OPTION_TEMP_COMPRESS_RECORD;

  file_length=(ulonglong) my_seek(info.dfile,0L,MY_SEEK_END,MYF(0));
  tmp_length= file_length+file_length/10;
  set_if_bigger(file_length,param->max_data_file_length);
  set_if_bigger(file_length,tmp_length);
  set_if_bigger(file_length,(ulonglong) share.base.max_data_file_length);

  VOID(mi_close(*org_info));
  bzero((char*) &create_info,sizeof(create_info));
  create_info.max_rows=max(max_records,share.base.records);
  create_info.reloc_rows=share.base.reloc;
  create_info.old_options=(share.options |
			   (unpack ? HA_OPTION_TEMP_COMPRESS_RECORD : 0));

  create_info.data_file_length=file_length;
  create_info.auto_increment=share.state.auto_increment;
  create_info.raid_type=   share.base.raid_type;
  create_info.raid_chunks= share.base.raid_chunks;
  create_info.raid_chunksize= share.base.raid_chunksize;
  create_info.language = (param->language ? param->language :
			  share.state.header.language);

  if (mi_create(fn_format(name,filename,"",MI_NAME_IEXT,
			  4+ (param->opt_follow_links ? 16 : 0)),
		share.base.keys - share.state.header.uniques,
		keyinfo, share.base.fields, recdef,
		share.state.header.uniques, uniquedef,
		&create_info,
		HA_DONT_TOUCH_DATA))
  {
    mi_check_print_error(param,"Got error %d when trying to recreate indexfile",my_errno);
    goto end;
  }
  *org_info=mi_open(name,O_RDWR,
		    (param->testflag & T_WAIT_FOREVER) ? HA_OPEN_WAIT_IF_LOCKED :
		    (param->testflag & T_DESCRIPT) ? HA_OPEN_IGNORE_IF_LOCKED :
		    HA_OPEN_ABORT_IF_LOCKED);
  if (!*org_info)
  {
    mi_check_print_error(param,"Got error %d when trying to open re-created indexfile",
		my_errno);
    goto end;
  }
  /* We are modifing */
  (*org_info)->s->options&= ~HA_OPTION_READ_ONLY_DATA;
  VOID(_mi_readinfo(*org_info,F_WRLCK,0));
  (*org_info)->state->records=info.state->records;
  if (share.state.create_time)
    (*org_info)->s->state.create_time=share.state.create_time;
  (*org_info)->s->state.unique=(*org_info)->this_unique=
    share.state.unique;
  (*org_info)->s->state.checksum=share.state.checksum;
  (*org_info)->state->del=info.state->del;
  (*org_info)->s->state.dellink=share.state.dellink;
  (*org_info)->state->empty=info.state->empty;
  (*org_info)->state->data_file_length=info.state->data_file_length;
  if (update_state_info(param,*org_info,UPDATE_TIME | UPDATE_STAT |
			UPDATE_OPEN_COUNT))
    goto end;
  error=0;
end:
  my_afree((gptr) uniquedef);
  my_afree((gptr) keyinfo);
  my_afree((gptr) recdef);
  my_afree((gptr) keysegs);
  return error;
}


	/* write suffix to data file if neaded */

int write_data_suffix(MI_CHECK *param, MI_INFO *info)
{
  if (info->s->options & HA_OPTION_COMPRESS_RECORD &&
      param->sort_info.fix_datafile)
  {
    char buff[MEMMAP_EXTRA_MARGIN];
    bzero(buff,sizeof(buff));
    if (my_b_write(&info->rec_cache,buff,sizeof(buff)))
    {
      mi_check_print_error(param,"%d when writing to datafile",my_errno);
      return 1;
    }
    param->read_cache.end_of_file+=sizeof(buff);
  }
  return 0;
}


	/* Update state and myisamchk_time of indexfile */

int update_state_info(MI_CHECK *param, MI_INFO *info,uint update)
{
  MYISAM_SHARE *share=info->s;

  if (update & UPDATE_OPEN_COUNT)
  {
    share->state.open_count=0;
    share->global_changed=0;
  }
  if (update & UPDATE_STAT)
  {
    uint key_parts= mi_uint2korr(share->state.header.key_parts);
    share->state.rec_per_key_rows=info->state->records;
    memcpy((char*) share->state.rec_per_key_part,
	   (char*) param->rec_per_key_part,
	   sizeof(*param->rec_per_key_part)*key_parts);
    share->state.changed&= ~STATE_NOT_ANALYZED;
  }
  if (update & (UPDATE_STAT | UPDATE_SORT | UPDATE_TIME | UPDATE_AUTO_INC))
  {
    if (update & UPDATE_TIME)
    {
      share->state.check_time= (long) time((time_t*) 0);
      if (!share->state.create_time)
	share->state.create_time=share->state.check_time;
    }
    if (mi_state_info_write(share->kfile,&share->state,1+2))
      goto err;
  }
  {						/* Force update of status */
    int error;
    uint r_locks=share->r_locks,w_locks=share->w_locks;
    share->r_locks=share->w_locks=0;
    error=_mi_writeinfo(info,WRITEINFO_NO_UNLOCK);
    share->r_locks=r_locks; share->w_locks=w_locks;
    if (!error)
      return 0;
  }
err:
  mi_check_print_error(param,"%d when updateing keyfile",my_errno);
  return 1;
}

	/*
	  Update auto increment value for a table
	  When setting the 'repair_only' flag we only want to change the
	  old auto_increment value if its wrong (smaller than some given key).
	  The reason is that we shouldn't change the auto_increment value
	  for a table without good reason when only doing a repair; If the
	  user have inserted and deleted rows, the auto_increment value
	  may be bigger than the biggest current row and this is ok.

	  If repair_only is not set, we will update the flag to the value in
	  param->auto_increment is bigger than the biggest key.
	*/

void update_auto_increment_key(MI_CHECK *param, MI_INFO *info,
			       my_bool repair_only)
{
  if (!info->s->base.auto_key ||
      !(((ulonglong) 1 << (info->s->base.auto_key-1)
	 & info->s->state.key_map)))
  {
    if (!(param->testflag & T_VERY_SILENT))
      mi_check_print_info(param,
			  "Table: %s doesn't have an auto increment key\n",
			  param->isam_file_name);
    return;
  }
  if (!(param->testflag & T_SILENT) &&
      !(param->testflag & (T_REP | T_REP_BY_SORT)))
    printf("Updating MyISAM file: %s\n", param->isam_file_name);
  /* We have to use keyread here as a normal read uses info->rec_buff */
  mi_extra(info,HA_EXTRA_KEYREAD);
  if (mi_rlast(info,info->rec_buff, info->s->base.auto_key-1))
  {
    if (my_errno != HA_ERR_END_OF_FILE)
    {
      mi_extra(info,HA_EXTRA_NO_KEYREAD);
      mi_check_print_error(param,"%d when reading last record",my_errno);
      return;
    }
    if (!repair_only)
      info->s->state.auto_increment=param->auto_increment_value;
  }
  else
  {
    ulonglong auto_increment= (repair_only ? info->s->state.auto_increment :
			       param->auto_increment_value);
    info->s->state.auto_increment=0;
    update_auto_increment(info,info->rec_buff);
    set_if_bigger(info->s->state.auto_increment,auto_increment);
  }
  mi_extra(info,HA_EXTRA_NO_KEYREAD);
  update_state_info(param, info, UPDATE_AUTO_INC);
  return;
}

    /* calculate unique keys for each part key */

static void update_key_parts(MI_KEYDEF *keyinfo,
			     ulong *rec_per_key_part,
			     ulonglong *unique,
			     ulonglong records)
{
  ulonglong count=0,tmp;
  uint parts;
  for (parts=0 ; parts < keyinfo->keysegs  ; parts++)
  {
    count+=unique[parts];
    if (count == 0)
      tmp=records;
    else
      tmp= (records+count/2) / count;
    if (tmp >= (ulonglong) ~(ulong) 0)
      tmp=(ulonglong) ~(ulong) 0;
    *rec_per_key_part=(ulong) tmp;
    rec_per_key_part++;
  }
}


ha_checksum mi_byte_checksum(const byte *buf, uint length)
{
  ha_checksum crc;
  const byte *end=buf+length;
  for (crc=0; buf != end; buf++)
    crc=((crc << 1) + *((uchar*) buf)) +
      test(crc & (((ha_checksum) 1) << (8*sizeof(ha_checksum)-1)));
  return crc;
}

/*
  Deactive all not unique index that can be recreated fast
  These include packed keys on which sorting will use more temporary
  space than the max allowed file length or for which the unpacked keys
  will take much more space than packed keys.
  Note that 'rows' may be zero for the case when we don't know how many
  rows we will put into the file.
 */

static my_bool mi_too_big_key_for_sort(MI_KEYDEF *key, ha_rows rows)
{
  return (key->flag & (HA_BINARY_PACK_KEY | HA_VAR_LENGTH_KEY | HA_FULLTEXT) &&
	  ((ulonglong) rows * key->maxlength >
	   (ulonglong) myisam_max_temp_length ||
	   (ulonglong) rows * (key->maxlength - key->minlength) / 2 >
	   myisam_max_extra_temp_length ||
	   (rows == 0 && (key->maxlength / key->minlength) > 2)));
}


void mi_disable_non_unique_index(MI_INFO *info, ha_rows rows)
{
  MYISAM_SHARE *share=info->s;
  uint i;
  if (!info->state->records)			/* Don't do this if old rows */
  {
    MI_KEYDEF *key=share->keyinfo;
    for (i=0 ; i < share->base.keys ; i++,key++)
    {
      if (!(key->flag & HA_NOSAME) && ! mi_too_big_key_for_sort(key,rows) &&
	  info->s->base.auto_key != i+1)
      {
	share->state.key_map&= ~ ((ulonglong) 1 << i);
	info->update|= HA_STATE_CHANGED;
      }
    }
  }
}


/*
  Return TRUE if we can use repair by sorting
  One can set the force argument to force to use sorting
  even if the temporary file would be quite big!
*/

my_bool mi_test_if_sort_rep(MI_INFO *info, ha_rows rows, 
			    my_bool force __attribute__((unused)))
{
  MYISAM_SHARE *share=info->s;
  uint i;
  MI_KEYDEF *key=share->keyinfo;
  if (!share->state.key_map)
    return FALSE;				/* Can't use sort */
  for (i=0 ; i < share->base.keys ; i++,key++)
  {
/* It's to disable repair_by_sort for ft-keys.
   Another solution would be to make ft-keys just too_big_key_for_sort,
   but then they won't be disabled by dectivate_non_unique_index
   and so they will be created at the first stage. As ft-key creation
   is very time-consuming process, it's better to leave it to repair stage
   but this repair shouldn't be repair_by_sort (serg)
 */
    if (mi_too_big_key_for_sort(key,rows) || (key->flag & HA_FULLTEXT))
      return FALSE;
  }
  return TRUE;
}