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mariadb/myisam/mi_create.c
monty@hundin.mysql.fi 4cbe66582c Symlinking of tables should not work. 
Fixed error number handling bug in mysqltest.
Fixed that error number from insert delayed is reported correctly.
merged new vio code with old violite code.
2001-06-05 03:38:10 +03:00

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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* Create a MyISAM table */
#include "fulltext.h"
#if defined(MSDOS) || defined(__WIN__)
#ifdef __WIN__
#include <fcntl.h>
#else
#include <process.h> /* Prototype for getpid */
#endif
#endif
#include <m_ctype.h>
/*
** Old options is used when recreating database, from isamchk
*/
int mi_create(const char *name,uint keys,MI_KEYDEF *keydefs,
uint columns, MI_COLUMNDEF *recinfo,
uint uniques, MI_UNIQUEDEF *uniquedefs,
MI_CREATE_INFO *ci,uint flags)
{
register uint i,j;
File dfile,file;
int errpos,save_errno;
myf create_flag;
uint fields,length,max_key_length,packed,pointer,
key_length,info_length,key_segs,options,min_key_length_skipp,
base_pos,varchar_count,long_varchar_count,varchar_length,
max_key_block_length,unique_key_parts,offset;
ulong reclength, real_reclength,min_pack_length;
char filename[FN_REFLEN],linkname[FN_REFLEN], *linkname_ptr;
ulong pack_reclength;
ulonglong tot_length,max_rows;
enum en_fieldtype type;
MYISAM_SHARE share;
MI_KEYDEF *keydef,tmp_keydef;
MI_UNIQUEDEF *uniquedef;
MI_KEYSEG *keyseg,tmp_keyseg;
MI_COLUMNDEF *rec;
ulong *rec_per_key_part;
my_off_t key_root[MI_MAX_POSSIBLE_KEY],key_del[MI_MAX_KEY_BLOCK_SIZE];
MI_CREATE_INFO tmp_create_info;
DBUG_ENTER("mi_create");
if (!ci)
{
bzero((char*) &tmp_create_info,sizeof(tmp_create_info));
ci=&tmp_create_info;
}
if (keys + uniques > MI_MAX_KEY)
{
DBUG_RETURN(my_errno=HA_WRONG_CREATE_OPTION);
}
LINT_INIT(dfile);
LINT_INIT(file);
pthread_mutex_lock(&THR_LOCK_myisam);
errpos=0;
options=0;
bzero((byte*) &share,sizeof(share));
if (flags & HA_DONT_TOUCH_DATA)
{
if (!(ci->old_options & HA_OPTION_TEMP_COMPRESS_RECORD))
options=ci->old_options &
(HA_OPTION_COMPRESS_RECORD | HA_OPTION_PACK_RECORD |
HA_OPTION_READ_ONLY_DATA | HA_OPTION_CHECKSUM |
HA_OPTION_TMP_TABLE | HA_OPTION_DELAY_KEY_WRITE);
else
options=ci->old_options &
(HA_OPTION_CHECKSUM | HA_OPTION_TMP_TABLE | HA_OPTION_DELAY_KEY_WRITE);
}
if (ci->reloc_rows > ci->max_rows)
ci->reloc_rows=ci->max_rows; /* Check if wrong parameter */
if (!(rec_per_key_part=
(ulong*) my_malloc((keys + uniques)*MI_MAX_KEY_SEG*sizeof(long),
MYF(MY_WME | MY_ZEROFILL))))
DBUG_RETURN(my_errno);
/* Start by checking fields and field-types used */
reclength=varchar_count=varchar_length=long_varchar_count=packed=
min_pack_length=pack_reclength=0;
for (rec=recinfo, fields=0 ;
fields != columns ;
rec++,fields++)
{
reclength+=rec->length;
if ((type=(enum en_fieldtype) rec->type) != FIELD_NORMAL &&
type != FIELD_CHECK)
{
packed++;
if (type == FIELD_BLOB)
{
share.base.blobs++;
if (pack_reclength != INT_MAX32)
{
if (rec->length == 4+mi_portable_sizeof_char_ptr)
pack_reclength= INT_MAX32;
else
pack_reclength+=(1 << ((rec->length-mi_portable_sizeof_char_ptr)*8)); /* Max blob length */
}
}
else if (type == FIELD_SKIPP_PRESPACE ||
type == FIELD_SKIPP_ENDSPACE)
{
if (pack_reclength != INT_MAX32)
pack_reclength+= rec->length > 255 ? 2 : 1;
min_pack_length++;
}
else if (type == FIELD_VARCHAR)
{
varchar_count++;
varchar_length+=rec->length-2;
packed--;
pack_reclength+=1;
if (test(rec->length > 257))
{ /* May be packed on 3 bytes */
long_varchar_count++;
pack_reclength+=2;
}
}
else if (type != FIELD_SKIPP_ZERO)
{
min_pack_length+=rec->length;
packed--; /* Not a pack record type */
}
}
else /* FIELD_NORMAL */
min_pack_length+=rec->length;
}
if ((packed & 7) == 1)
{ /* Bad packing, try to remove a zero-field */
while (rec != recinfo)
{
rec--;
if (rec->type == (int) FIELD_SKIPP_ZERO && rec->length == 1)
{
rec->type=(int) FIELD_NORMAL;
packed--;
min_pack_length++;
break;
}
}
}
if (packed || (flags & HA_PACK_RECORD))
options|=HA_OPTION_PACK_RECORD; /* Must use packed records */
if (options & (HA_OPTION_PACK_RECORD | HA_OPTION_COMPRESS_RECORD))
min_pack_length+=varchar_count; /* Min length to pack */
else
{
min_pack_length+=varchar_length+2*varchar_count;
}
if (flags & HA_CREATE_TMP_TABLE)
options|= HA_OPTION_TMP_TABLE;
if (flags & HA_CREATE_CHECKSUM || (options & HA_OPTION_CHECKSUM))
{
options|= HA_OPTION_CHECKSUM;
min_pack_length++;
}
if (flags & HA_CREATE_DELAY_KEY_WRITE)
options|= HA_OPTION_DELAY_KEY_WRITE;
packed=(packed+7)/8;
if (pack_reclength != INT_MAX32)
pack_reclength+= reclength+packed +
test(test_all_bits(options, HA_OPTION_CHECKSUM | HA_PACK_RECORD));
min_pack_length+=packed;
if (!ci->data_file_length)
{
if (ci->max_rows == 0 || pack_reclength == INT_MAX32)
ci->data_file_length= INT_MAX32-1; /* Should be enough */
else if ((~(ulonglong) 0)/ci->max_rows < (ulonglong) pack_reclength)
ci->data_file_length= ~(ulonglong) 0;
else
ci->data_file_length=(ulonglong) ci->max_rows*pack_reclength;
}
else if (!ci->max_rows)
ci->max_rows=(ha_rows) (ci->data_file_length/(min_pack_length +
((options & HA_OPTION_PACK_RECORD) ?
3 : 0)));
if (options & (HA_OPTION_COMPRESS_RECORD | HA_OPTION_PACK_RECORD))
pointer=mi_get_pointer_length(ci->data_file_length,4);
else
pointer=mi_get_pointer_length(ci->max_rows,4);
if (!(max_rows=(ulonglong) ci->max_rows))
max_rows= ((((ulonglong) 1 << (pointer*8)) -1) / min_pack_length);
real_reclength=reclength;
if (!(options & (HA_OPTION_COMPRESS_RECORD | HA_OPTION_PACK_RECORD)))
{
if (reclength <= pointer)
reclength=pointer+1; /* reserve place for delete link */
}
else
reclength+=long_varchar_count; /* We need space for this! */
max_key_length=0; tot_length=0 ; key_segs=0;
max_key_block_length=0;
share.state.rec_per_key_part=rec_per_key_part;
share.state.key_root=key_root;
share.state.key_del=key_del;
if (uniques)
{
max_key_block_length= MI_KEY_BLOCK_LENGTH;
max_key_length= MI_UNIQUE_HASH_LENGTH;
}
for (i=0, keydef=keydefs ; i < keys ; i++ , keydef++)
{
share.state.key_root[i]= HA_OFFSET_ERROR;
min_key_length_skipp=length=0;
key_length=pointer;
if (keydef->flag & HA_FULLTEXT) /* SerG */
{
keydef->flag=HA_FULLTEXT | HA_PACK_KEY | HA_VAR_LENGTH_KEY;
options|=HA_OPTION_PACK_KEYS; /* Using packed keys */
if (flags & HA_DONT_TOUCH_DATA)
{
/* called by myisamchk - i.e. table structure was taken from
MYI file and FULLTEXT key *do has* additional FT_SEGS keysegs.
We'd better delete them now
*/
keydef->keysegs-=FT_SEGS;
}
for (j=0, keyseg=keydef->seg ; (int) j < keydef->keysegs ;
j++, keyseg++)
{
if (keyseg->type != HA_KEYTYPE_TEXT &&
keyseg->type != HA_KEYTYPE_VARTEXT)
{
my_errno=HA_WRONG_CREATE_OPTION;
goto err;
}
}
keydef->keysegs+=FT_SEGS;
key_length+= HA_FT_MAXLEN+HA_FT_WLEN;
#ifdef EVAL_RUN
key_length++;
#endif
length++; /* At least one length byte */
min_key_length_skipp+=HA_FT_MAXLEN;
#if HA_FT_MAXLEN >= 255
min_key_length_skipp+=2; /* prefix may be 3 bytes */
length+=2;
#endif
}
else
{
/* Test if prefix compression */
if (keydef->flag & HA_PACK_KEY)
{
/* Can't use space_compression on number keys */
if ((keydef->seg[0].flag & HA_SPACE_PACK) &&
keydef->seg[0].type == (int) HA_KEYTYPE_NUM)
keydef->seg[0].flag&= ~HA_SPACE_PACK;
/* Only use HA_PACK_KEY if the first segment is a variable length key */
if (!(keydef->seg[0].flag & (HA_SPACE_PACK | HA_BLOB_PART |
HA_VAR_LENGTH)))
{
/* pack relative to previous key */
keydef->flag&= ~HA_PACK_KEY;
keydef->flag|= HA_BINARY_PACK_KEY | HA_VAR_LENGTH_KEY;
}
else
{
keydef->seg[0].flag|=HA_PACK_KEY; /* for easyer intern test */
keydef->flag|=HA_VAR_LENGTH_KEY;
options|=HA_OPTION_PACK_KEYS; /* Using packed keys */
}
}
if (keydef->flag & HA_BINARY_PACK_KEY)
options|=HA_OPTION_PACK_KEYS; /* Using packed keys */
if (keydef->flag & HA_AUTO_KEY)
share.base.auto_key=i+1;
for (j=0, keyseg=keydef->seg ; j < keydef->keysegs ; j++, keyseg++)
{
/* numbers are stored with high by first to make compression easier */
switch (keyseg->type) {
case HA_KEYTYPE_SHORT_INT:
case HA_KEYTYPE_LONG_INT:
case HA_KEYTYPE_FLOAT:
case HA_KEYTYPE_DOUBLE:
case HA_KEYTYPE_USHORT_INT:
case HA_KEYTYPE_ULONG_INT:
case HA_KEYTYPE_LONGLONG:
case HA_KEYTYPE_ULONGLONG:
case HA_KEYTYPE_INT24:
case HA_KEYTYPE_UINT24:
case HA_KEYTYPE_INT8:
keyseg->flag|= HA_SWAP_KEY;
/* fall through */
default:
break;
}
if (keyseg->flag & HA_SPACE_PACK)
{
keydef->flag |= HA_SPACE_PACK_USED | HA_VAR_LENGTH_KEY;
options|=HA_OPTION_PACK_KEYS; /* Using packed keys */
length++; /* At least one length byte */
min_key_length_skipp+=keyseg->length;
if (keyseg->length >= 255)
{ /* prefix may be 3 bytes */
min_key_length_skipp+=2;
length+=2;
}
}
if (keyseg->flag & (HA_VAR_LENGTH | HA_BLOB_PART))
{
keydef->flag|=HA_VAR_LENGTH_KEY;
length++; /* At least one length byte */
options|=HA_OPTION_PACK_KEYS; /* Using packed keys */
min_key_length_skipp+=keyseg->length;
if (keyseg->length >= 255)
{ /* prefix may be 3 bytes */
min_key_length_skipp+=2;
length+=2;
}
}
key_length+= keyseg->length;
if (keyseg->null_bit)
{
key_length++;
options|=HA_OPTION_PACK_KEYS;
keyseg->flag|=HA_NULL_PART;
keydef->flag|=HA_VAR_LENGTH_KEY | HA_NULL_PART_KEY;
}
}
} /* if HA_FULLTEXT */
key_segs+=keydef->keysegs;
if (keydef->keysegs > MI_MAX_KEY_SEG)
{
my_errno=HA_WRONG_CREATE_OPTION;
goto err;
}
if ((keydef->flag & (HA_NOSAME | HA_NULL_PART_KEY)) == HA_NOSAME)
share.state.rec_per_key_part[key_segs-1]=1L;
length+=key_length;
keydef->block_length= MI_BLOCK_SIZE(length,pointer,MI_MAX_KEYPTR_SIZE);
if (keydef->block_length/MI_KEY_BLOCK_LENGTH > MI_MAX_KEY_BLOCK_SIZE)
{
my_errno=HA_WRONG_CREATE_OPTION;
goto err;
}
set_if_bigger(max_key_block_length,keydef->block_length);
keydef->keylength= (uint16) key_length;
keydef->minlength= (uint16) (length-min_key_length_skipp);
keydef->maxlength= (uint16) length;
if (length > max_key_length)
max_key_length= length;
tot_length+= (max_rows/(ulong) (((uint) keydef->block_length-5)/
(length*2)))*
(ulong) keydef->block_length;
}
for (i=max_key_block_length/MI_KEY_BLOCK_LENGTH ; i-- ; )
key_del[i]=HA_OFFSET_ERROR;
unique_key_parts=0;
offset=reclength-uniques*MI_UNIQUE_HASH_LENGTH;
for (i=0, uniquedef=uniquedefs ; i < uniques ; i++ , uniquedef++)
{
uniquedef->key=keys+i;
unique_key_parts+=uniquedef->keysegs;
share.state.key_root[keys+i]= HA_OFFSET_ERROR;
}
keys+=uniques; /* Each unique has 1 key */
key_segs+=uniques; /* Each unique has 1 key seg */
base_pos=(MI_STATE_INFO_SIZE + keys * MI_STATE_KEY_SIZE +
max_key_block_length/MI_KEY_BLOCK_LENGTH*MI_STATE_KEYBLOCK_SIZE+
key_segs*MI_STATE_KEYSEG_SIZE);
info_length=base_pos+(uint) (MI_BASE_INFO_SIZE+
keys * MI_KEYDEF_SIZE+
uniques * MI_UNIQUEDEF_SIZE +
(key_segs + unique_key_parts)*MI_KEYSEG_SIZE+
columns*MI_COLUMNDEF_SIZE);
bmove(share.state.header.file_version,(byte*) myisam_file_magic,4);
ci->old_options=options| (ci->old_options & HA_OPTION_TEMP_COMPRESS_RECORD ?
HA_OPTION_COMPRESS_RECORD |
HA_OPTION_TEMP_COMPRESS_RECORD: 0);
mi_int2store(share.state.header.options,ci->old_options);
mi_int2store(share.state.header.header_length,info_length);
mi_int2store(share.state.header.state_info_length,MI_STATE_INFO_SIZE);
mi_int2store(share.state.header.base_info_length,MI_BASE_INFO_SIZE);
mi_int2store(share.state.header.base_pos,base_pos);
share.state.header.language= (ci->language ?
ci->language : MY_CHARSET_CURRENT);
share.state.header.max_block_size=max_key_block_length/MI_KEY_BLOCK_LENGTH;
share.state.dellink = HA_OFFSET_ERROR;
share.state.process= (ulong) getpid();
share.state.unique= (ulong) 0;
share.state.update_count=(ulong) 0;
share.state.version= (ulong) time((time_t*) 0);
share.state.sortkey= (ushort) ~0;
share.state.auto_increment=ci->auto_increment;
share.options=options;
share.base.rec_reflength=pointer;
share.base.key_reflength=
mi_get_pointer_length((tot_length + max_key_block_length * keys *
MI_INDEX_BLOCK_MARGIN) / MI_KEY_BLOCK_LENGTH,
3);
share.base.keys= share.state.header.keys = keys;
share.state.header.uniques= uniques;
mi_int2store(share.state.header.key_parts,key_segs);
mi_int2store(share.state.header.unique_key_parts,unique_key_parts);
share.state.key_map = ((ulonglong) 1 << keys)-1;
share.base.keystart = share.state.state.key_file_length=
MY_ALIGN(info_length, myisam_block_size);
share.base.max_key_block_length=max_key_block_length;
share.base.max_key_length=ALIGN_SIZE(max_key_length+4);
share.base.records=ci->max_rows;
share.base.reloc= ci->reloc_rows;
share.base.reclength=real_reclength;
share.base.pack_reclength=reclength+ test(options & HA_OPTION_CHECKSUM);;
share.base.max_pack_length=pack_reclength;
share.base.min_pack_length=min_pack_length;
share.base.pack_bits=packed;
share.base.fields=fields;
share.base.pack_fields=packed;
#ifdef USE_RAID
share.base.raid_type=ci->raid_type;
share.base.raid_chunks=ci->raid_chunks;
share.base.raid_chunksize=ci->raid_chunksize;
#endif
/* max_data_file_length and max_key_file_length are recalculated on open */
if (options & HA_OPTION_TMP_TABLE)
share.base.max_data_file_length=(my_off_t) ci->data_file_length;
share.base.min_block_length=
(share.base.pack_reclength+3 < MI_EXTEND_BLOCK_LENGTH &&
! share.base.blobs) ?
max(share.base.pack_reclength,MI_MIN_BLOCK_LENGTH) :
MI_EXTEND_BLOCK_LENGTH;
if (! (flags & HA_DONT_TOUCH_DATA))
share.state.create_time= (long) time((time_t*) 0);
if (ci->index_file_name)
{
fn_format(filename, ci->index_file_name,"",MI_NAME_IEXT,4);
fn_format(linkname,name, "",MI_NAME_IEXT,4);
linkname_ptr=linkname;
/*
Don't create the table if the link or file exists to ensure that one
doesn't accidently destroy another table.
*/
create_flag=0;
}
else
{
fn_format(filename,name,"",MI_NAME_IEXT,(4+ (flags & HA_DONT_TOUCH_DATA) ?
32 : 0));
linkname_ptr=0;
/* Replace the current file */
create_flag=MY_DELETE_OLD;
}
if ((file= my_create_with_symlink(linkname_ptr,
filename,
0, O_RDWR | O_TRUNC,
MYF(MY_WME | create_flag))) < 0)
goto err;
errpos=1;
if (!(flags & HA_DONT_TOUCH_DATA))
{
#ifdef USE_RAID
if (share.base.raid_type)
{
(void) fn_format(filename,name,"",MI_NAME_DEXT,2+4);
if ((dfile=my_raid_create(filename,0,O_RDWR | O_TRUNC,
share.base.raid_type,
share.base.raid_chunks,
share.base.raid_chunksize,
MYF(MY_WME | MY_RAID))) < 0)
goto err;
}
else
#endif
{
if (ci->data_file_name)
{
fn_format(filename, ci->data_file_name,"",MI_NAME_DEXT,4);
fn_format(linkname, name, "",MI_NAME_DEXT,4);
linkname_ptr=linkname;
create_flag=0;
}
else
{
fn_format(filename,name,"",MI_NAME_DEXT,4);
linkname_ptr=0;
create_flag=MY_DELETE_OLD;
}
if ((dfile=
my_create_with_symlink(linkname_ptr, filename,
0,O_RDWR | O_TRUNC,
MYF(MY_WME | create_flag))) < 0)
goto err;
}
errpos=3;
}
if (mi_state_info_write(file, &share.state, 2) ||
mi_base_info_write(file, &share.base))
goto err;
#ifndef DBUG_OFF
if ((uint) my_tell(file,MYF(0)) != base_pos+ MI_BASE_INFO_SIZE)
{
uint pos=(uint) my_tell(file,MYF(0));
DBUG_PRINT("warning",("base_length: %d != used_length: %d",
base_pos+ MI_BASE_INFO_SIZE, pos));
}
#endif
/* Write key and keyseg definitions */
for (i=0 ; i < share.base.keys - uniques; i++)
{
uint ft_segs=(keydefs[i].flag & HA_FULLTEXT) ? FT_SEGS : 0;
if (mi_keydef_write(file, &keydefs[i]))
goto err;
for (j=0 ; j < keydefs[i].keysegs-ft_segs ; j++)
if (mi_keyseg_write(file, &keydefs[i].seg[j]))
goto err;
for (j=0 ; j < ft_segs ; j++)
{
MI_KEYSEG seg=ft_keysegs[j];
seg.language= keydefs[i].seg[0].language;
if (mi_keyseg_write(file, &seg))
goto err;
}
}
/* Create extra keys for unique definitions */
offset=reclength-uniques*MI_UNIQUE_HASH_LENGTH;
bzero((char*) &tmp_keydef,sizeof(tmp_keydef));
bzero((char*) &tmp_keyseg,sizeof(tmp_keyseg));
for (i=0; i < uniques ; i++)
{
tmp_keydef.keysegs=1;
tmp_keydef.flag= HA_UNIQUE_CHECK;
tmp_keydef.block_length= MI_KEY_BLOCK_LENGTH;
tmp_keydef.keylength= MI_UNIQUE_HASH_LENGTH + pointer;
tmp_keydef.minlength=tmp_keydef.maxlength=tmp_keydef.keylength;
tmp_keyseg.type= MI_UNIQUE_HASH_TYPE;
tmp_keyseg.length= MI_UNIQUE_HASH_LENGTH;
tmp_keyseg.start= offset;
offset+= MI_UNIQUE_HASH_LENGTH;
if (mi_keydef_write(file,&tmp_keydef) ||
mi_keyseg_write(file,(&tmp_keyseg)))
goto err;
}
/* Save unique definition */
for (i=0 ; i < share.state.header.uniques ; i++)
{
if (mi_uniquedef_write(file, &uniquedefs[i]))
goto err;
for (j=0 ; j < uniquedefs[i].keysegs ; j++)
{
if (mi_keyseg_write(file, &uniquedefs[i].seg[j]))
goto err;
}
}
for (i=0 ; i < share.base.fields ; i++)
if (mi_recinfo_write(file, &recinfo[i]))
goto err;
#ifndef DBUG_OFF
if ((uint) my_tell(file,MYF(0)) != info_length)
{
uint pos= (uint) my_tell(file,MYF(0));
DBUG_PRINT("warning",("info_length: %d != used_length: %d",
info_length, pos));
}
#endif
/* Enlarge files */
if (my_chsize(file,(ulong) share.base.keystart,MYF(0)))
goto err;
if (! (flags & HA_DONT_TOUCH_DATA))
{
#ifdef USE_RELOC
if (my_chsize(dfile,share.base.min_pack_length*ci->reloc_rows,MYF(0)))
goto err;
#endif
errpos=2;
if (my_close(dfile,MYF(0)))
goto err;
}
errpos=0;
pthread_mutex_unlock(&THR_LOCK_myisam);
if (my_close(file,MYF(0)))
goto err;
my_free((char*) rec_per_key_part,MYF(0));
DBUG_RETURN(0);
err:
pthread_mutex_unlock(&THR_LOCK_myisam);
save_errno=my_errno;
switch (errpos) {
case 3:
VOID(my_close(dfile,MYF(0)));
/* fall through */
case 2:
/* QQ: T<>nu should add a call to my_raid_delete() here */
if (! (flags & HA_DONT_TOUCH_DATA))
my_delete_with_symlink(fn_format(filename,name,"",MI_NAME_DEXT,2+4),
MYF(0));
/* fall through */
case 1:
VOID(my_close(file,MYF(0)));
if (! (flags & HA_DONT_TOUCH_DATA))
my_delete_with_symlink(fn_format(filename,name,"",MI_NAME_IEXT,2+4),
MYF(0));
}
my_free((char*) rec_per_key_part, MYF(0));
DBUG_RETURN(my_errno=save_errno); /* return the fatal errno */
}
uint mi_get_pointer_length(ulonglong file_length, uint def)
{
if (file_length) /* If not default */
{
if (file_length >= (longlong) 1 << 56)
def=8;
if (file_length >= (longlong) 1 << 48)
def=7;
if (file_length >= (longlong) 1 << 40)
def=6;
else if (file_length >= (longlong) 1 << 32)
def=5;
else if (file_length >= (1L << 24))
def=4;
else if (file_length >= (1L << 16))
def=3;
else
def=2;
}
return def;
}
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