create.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:11k
- /* 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 */
- /* Skapar en isam-databas */
- #include "isamdef.h"
- #if defined(MSDOS) || defined(__WIN__)
- #ifdef __WIN__
- #include <fcntl.h>
- #else
- #include <process.h> /* Prototype for getpid */
- #endif
- #endif
- /*
- ** Old options is used when recreating database, from isamchk
- ** Note that the minimun reclength that MySQL allows for static rows
- ** are 5. (Will be fixed in the next generation)
- */
- int nisam_create(const char *name,uint keys,N_KEYDEF *keyinfo,
- N_RECINFO *recinfo,
- ulong records,ulong reloc, uint flags,uint old_options,
- ulong data_file_length)
- {
- register uint i,j;
- File dfile,file;
- int errpos,save_errno;
- uint fields,length,max_key_length,packed,pointer,reclength,min_pack_length,
- key_length,info_length,key_segs,options,min_key_length_skipp,max_block,
- base_pos;
- char buff[max(FN_REFLEN,512)];
- ulong tot_length,pack_reclength;
- enum en_fieldtype type;
- ISAM_SHARE share;
- N_KEYDEF *keydef;
- N_KEYSEG *keyseg;
- N_RECINFO *rec;
- DBUG_ENTER("nisam_create");
- LINT_INIT(dfile);
- pthread_mutex_lock(&THR_LOCK_isam);
- errpos=0;
- options=0;
- base_pos=512; /* Enough for N_STATE_INFO */
- bzero((byte*) &share,sizeof(share));
- if ((file = my_create(fn_format(buff,name,"",N_NAME_IEXT,4),0,
- O_RDWR | O_EXCL | O_NOFOLLOW,MYF(MY_WME))) < 0)
- goto err;
- errpos=1;
- VOID(fn_format(buff,name,"",N_NAME_DEXT,2+4));
- if (!(flags & HA_DONT_TOUCH_DATA))
- {
- if ((dfile = my_create(buff,0,O_RDWR | O_EXCL | O_NOFOLLOW,
- MYF(MY_WME))) < 0)
- goto err;
- errpos=2;
- }
- else if (!(old_options & HA_OPTION_TEMP_COMPRESS_RECORD))
- options=old_options & (HA_OPTION_COMPRESS_RECORD |
- HA_OPTION_READ_ONLY_DATA | HA_OPTION_PACK_RECORD);
- if (reloc > records)
- reloc=records; /* Check if wrong parameter */
- /* Start by checking fields and field-types used */
- reclength=0;
- for (rec=recinfo, fields=packed=min_pack_length=0, pack_reclength=0L;
- rec->base.type != (int) FIELD_LAST;
- rec++,fields++)
- {
- reclength+=rec->base.length;
- if ((type=(enum en_fieldtype) rec->base.type))
- {
- packed++;
- if (type == FIELD_BLOB)
- {
- share.base.blobs++;
- rec->base.length-= sizeof(char*); /* Don't calc pointer */
- if (pack_reclength != NI_POS_ERROR)
- {
- if (rec->base.length == 4)
- pack_reclength= (ulong) NI_POS_ERROR;
- else
- pack_reclength+=sizeof(char*)+(1 << (rec->base.length*8));
- }
- }
- else if (type == FIELD_SKIP_PRESPACE ||
- type == FIELD_SKIP_ENDSPACE)
- {
- if (pack_reclength != NI_POS_ERROR)
- pack_reclength+= rec->base.length > 255 ? 2 : 1;
- min_pack_length++;
- }
- else if (type == FIELD_ZERO)
- packed--;
- else if (type != FIELD_SKIP_ZERO)
- {
- min_pack_length+=rec->base.length;
- packed--; /* Not a pack record type */
- }
- }
- else
- min_pack_length+=rec->base.length;
- }
- if ((packed & 7) == 1)
- { /* Bad packing, try to remove a zero-field */
- while (rec != recinfo)
- {
- rec--;
- if (rec->base.type == (int) FIELD_SKIP_ZERO && rec->base.length == 1)
- {
- rec->base.type=(int) FIELD_NORMAL;
- packed--;
- min_pack_length++;
- break;
- }
- }
- }
- if (packed && !(options & HA_OPTION_COMPRESS_RECORD))
- options|=HA_OPTION_PACK_RECORD; /* Must use packed records */
- packed=(packed+7)/8;
- if (pack_reclength != NI_POS_ERROR)
- pack_reclength+= reclength+packed;
- min_pack_length+=packed;
- if (options & HA_OPTION_COMPRESS_RECORD)
- {
- if (data_file_length >= (1L << 24))
- pointer=4;
- else if (data_file_length >= (1L << 16))
- pointer=3;
- else
- pointer=2;
- }
- else if (((records == 0L && pack_reclength < 255) ||
- options & HA_OPTION_PACK_RECORD) ||
- records >= (ulong) 16000000L ||
- pack_reclength == (ulong) NI_POS_ERROR ||
- ((options & HA_OPTION_PACK_RECORD) &&
- pack_reclength+4 >= (ulong) 14000000L/records))
- pointer=4;
- else if (records == 0L || records >= (ulong) 65000L ||
- ((options & HA_OPTION_PACK_RECORD) &&
- pack_reclength+4 >= (ulong) 60000L/records))
- pointer=3;
- else
- pointer=2;
- max_block=max_key_length=0; tot_length=key_segs=0;
- for (i=0, keydef=keyinfo ; i < keys ; i++ , keydef++)
- {
- share.state.key_root[i]= share.state.key_del[i]= NI_POS_ERROR;
- share.base.rec_per_key[i]= (keydef->base.flag & HA_NOSAME) ? 1L : 0L;
- min_key_length_skipp=length=0;
- key_length=pointer;
- if (keydef->base.flag & HA_PACK_KEY &&
- keydef->seg[0].base.length > 127)
- keydef->base.flag&= ~HA_PACK_KEY; /* Can't pack long keys */
- if (keydef->base.flag & HA_PACK_KEY)
- {
- if ((keydef->seg[0].base.flag & HA_SPACE_PACK) &&
- keydef->seg[0].base.type == (int) HA_KEYTYPE_NUM)
- keydef->seg[0].base.flag&= ~HA_SPACE_PACK;
- if (!(keydef->seg[0].base.flag & HA_SPACE_PACK))
- length++;
- keydef->seg[0].base.flag|=HA_PACK_KEY; /* for easyer intern test */
- options|=HA_OPTION_PACK_KEYS; /* Using packed keys */
- if (!(keydef->seg[0].base.flag & HA_SPACE_PACK))
- min_key_length_skipp+=keydef->seg[0].base.length;
- }
- keydef->base.keysegs=0;
- for (keyseg=keydef->seg ; keyseg->base.type ; keyseg++)
- {
- keydef->base.keysegs++;
- if (keyseg->base.length > 127)
- keyseg->base.flag&= ~(HA_SPACE_PACK | HA_PACK_KEY);
- if (keyseg->base.flag & HA_SPACE_PACK)
- {
- keydef->base.flag |= HA_SPACE_PACK_USED;
- options|=HA_OPTION_PACK_KEYS; /* Using packed keys */
- length++;
- min_key_length_skipp+=keyseg->base.length;
- }
- key_length+= keyseg->base.length;
- }
- bzero((gptr) keyseg,sizeof(keyseg[0]));
- keyseg->base.length=(uint16) pointer; /* Last key part is pointer */
- key_segs+=keydef->base.keysegs;
- length+=key_length;
- keydef->base.block_length=nisam_block_size;
- keydef->base.keylength= (uint16) key_length;
- keydef->base.minlength= (uint16) (length-min_key_length_skipp);
- keydef->base.maxlength= (uint16) length;
- if ((uint) keydef->base.block_length > max_block)
- max_block=(uint) keydef->base.block_length;
- if (length > max_key_length)
- max_key_length= length;
- tot_length+= (records/(ulong) (((uint) keydef->base.block_length-5)/
- (length*2)))*
- (ulong) keydef->base.block_length;
- }
- info_length=(uint) (base_pos+sizeof(N_BASE_INFO)+keys*sizeof(N_SAVE_KEYDEF)+
- (keys+key_segs)*sizeof(N_SAVE_KEYSEG)+
- fields*sizeof(N_SAVE_RECINFO));
- bmove(share.state.header.file_version,(byte*) nisam_file_magic,4);
- old_options=options| (old_options & HA_OPTION_TEMP_COMPRESS_RECORD ?
- HA_OPTION_COMPRESS_RECORD |
- HA_OPTION_TEMP_COMPRESS_RECORD: 0);
- int2store(share.state.header.options,old_options);
- int2store(share.state.header.header_length,info_length);
- int2store(share.state.header.state_info_length,sizeof(N_STATE_INFO));
- int2store(share.state.header.base_info_length,sizeof(N_BASE_INFO));
- int2store(share.state.header.base_pos,base_pos);
- share.state.dellink = NI_POS_ERROR;
- share.state.process= (ulong) getpid();
- share.state.uniq= (ulong) file;
- share.state.loop= 0;
- share.state.version= (ulong) time((time_t*) 0);
- share.base.options=options;
- share.base.rec_reflength=pointer;
- share.base.key_reflength=((!tot_length || tot_length > 30000000L) ? 3 :
- tot_length > 120000L ? 2 : 1);
- share.base.keys= share.state.keys = keys;
- share.base.keystart = share.state.key_file_length=MY_ALIGN(info_length,
- nisam_block_size);
- share.base.max_block=max_block;
- share.base.max_key_length=(uint) ALIGN_SIZE(max_key_length+4);
- share.base.records=records;
- share.base.reloc=reloc;
- share.base.reclength=reclength;
- share.base.pack_reclength=
- (uint) (reclength+packed-share.base.blobs*sizeof(char*));
- 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;
- share.base.sortkey= (ushort) ~0;
- share.base.max_data_file_length= (pointer == 4) ? (ulong) ~0L :
- (options & (HA_OPTION_PACK_RECORD | HA_OPTION_COMPRESS_RECORD)) ?
- (ulong) (1L << (pointer*8)) :
- (pointer == 3 && reclength >= 256L) ? (ulong) NI_POS_ERROR :
- ((ulong) reclength * (1L << (pointer*8)));
- share.base.max_key_file_length= (share.base.key_reflength == 3 ?
- NI_POS_ERROR :
- (ulong)
- (1L << (share.base.key_reflength*8))*512);
- share.base.min_block_length=
- (share.base.pack_reclength+3 < N_EXTEND_BLOCK_LENGTH &&
- ! share.base.blobs) ?
- max(share.base.pack_reclength,N_MIN_BLOCK_LENGTH) :
- N_EXTEND_BLOCK_LENGTH;
- if (! (flags & HA_DONT_TOUCH_DATA))
- share.base.create_time= (long) time((time_t*) 0);
- bzero(buff,base_pos);
- if (my_write(file,(char*) &share.state,sizeof(N_STATE_INFO),MYF(MY_NABP)) ||
- my_write(file,buff,base_pos-sizeof(N_STATE_INFO),MYF(MY_NABP)) ||
- my_write(file,(char*) &share.base,sizeof(N_BASE_INFO),MYF(MY_NABP)))
- goto err;
- for (i=0 ; i < share.base.keys ; i++)
- {
- if (my_write(file,(char*) &keyinfo[i].base,sizeof(N_SAVE_KEYDEF),
- MYF(MY_NABP)))
- goto err;
- for (j=0 ; j <= keyinfo[i].base.keysegs ; j++)
- {
- if (my_write(file,(char*) &keyinfo[i].seg[j].base,sizeof(N_SAVE_KEYSEG),
- MYF(MY_NABP)))
- goto err;
- }
- }
- for (i=0 ; i < share.base.fields ; i++)
- if (my_write(file,(char*) &recinfo[i].base, (uint) sizeof(N_SAVE_RECINFO),
- MYF(MY_NABP)))
- goto err;
- /* Enlarge files */
- if (my_chsize(file, (ulong) share.base.keystart, 0, MYF(0)))
- goto err;
- if (! (flags & HA_DONT_TOUCH_DATA))
- {
- #ifdef USE_RELOC
- if (my_chsize(dfile, share.base.min_pack_length*reloc, 0, MYF(0)))
- goto err;
- #endif
- errpos=1;
- if (my_close(dfile,MYF(0)))
- goto err;
- }
- errpos=0;
- pthread_mutex_unlock(&THR_LOCK_isam);
- if (my_close(file,MYF(0)))
- goto err;
- DBUG_RETURN(0);
- err:
- pthread_mutex_unlock(&THR_LOCK_isam);
- save_errno=my_errno;
- switch (errpos) {
- case 2:
- VOID(my_close(dfile,MYF(0)));
- /* fall through */
- case 1:
- VOID(my_close(file,MYF(0)));
- }
- my_errno=save_errno; /* R{tt felkod tillbaka */
- DBUG_RETURN(-1);
- } /* nisam_create */