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table checksum background:

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my_checksum() mysys function
   NISAM checksum code moved from mysys to isam/ - it's obsolete
   MyISAM checksum code moved to mysys
   table's checksum accessible from sql layer
   SHOW TABLE STATUS shows checksum (WL#646)
code cleanup


include/my_sys.h:
  table checksum background: my_checksum() mysys function
include/myisam.h:
  table checksum background: my_checksum() mysys function
  MyISAM checksum code moved to mysys
isam/isamchk.c:
  table checksum background:
  NISAM checksum code moved from mysys to isam/ - it's obsolete
isam/isamdef.h:
  table checksum background:
  NISAM checksum code moved from mysys to isam/ - it's obsolete
isam/open.c:
  table checksum background:
  NISAM checksum code moved from mysys to isam/ - it's obsolete
isam/pack_isam.c:
  table checksum background:
  NISAM checksum code moved from mysys to isam/ - it's obsolete
myisam/mi_checksum.c:
  table checksum background: my_checksum() mysys function
  MyISAM checksum code moved to mysys
mysys/checksum.c:
  table checksum background: my_checksum() mysys function
  MyISAM checksum code moved to mysys
sql/ha_myisam.cc:
  table checksum background: table's checksum accessible from sql layer
sql/ha_myisam.h:
  table checksum background: table's checksum accessible from sql layer
sql/handler.h:
  table checksum background: table's checksum accessible from sql layer
  code cleanup
sql/sql_lex.h:
  table checksum background: table's checksum accessible from sql layer
  code cleanup
sql/sql_select.cc:
  warning removed
sql/sql_show.cc:
  SHOW TABLE STATUS shows checksum (WL#646)
sql/sql_yacc.yy:
  cleanup
  (DROP TABLES syntax added as a side effect :))
This commit is contained in:
unknown 2003-08-05 21:14:15 +02:00
commit eb5f968c45
15 changed files with 118 additions and 84 deletions
Download patch file Download diff file Expand all files Collapse all files

2
isam/isamchk.c
View file

@ -1328,7 +1328,7 @@ int extend;
print_error("Found wrong record at %lu",(ulong) start_recpos);
got_error=1;
}
crc^=checksum(record,info->s->base.reclength);
crc^=_nisam_checksum(record,info->s->base.reclength);
link_used+=info->s->pack.ref_length;
used+=block_info.rec_len+info->s->pack.ref_length;
}

1
isam/isamdef.h
View file

@ -358,6 +358,7 @@ extern int _nisam_read_pack_record(N_INFO *info,ulong filepos,byte *buf);
extern int _nisam_read_rnd_pack_record(N_INFO*, byte *,ulong, int);
extern int _nisam_pack_rec_unpack(N_INFO *info,byte *to,byte *from,
uint reclength);
extern ulong _nisam_checksum(const byte *mem, uint count);
typedef struct st_sortinfo {
uint key_length;

19
isam/open.c
View file

@ -453,3 +453,22 @@ static void setup_key_functions(register N_KEYDEF *keyinfo)
}
return;
}
/*
Calculate a long checksum for a memoryblock. Used to verify pack_isam
SYNOPSIS
checksum()
mem Pointer to memory block
count Count of bytes
*/
ulong _nisam_checksum(const byte *mem, uint count)
{
ulong crc;
for (crc= 0; count-- ; mem++)
crc= ((crc << 1) + *((uchar*) mem)) +
test(crc & ((ulong) 1L << (8*sizeof(ulong)-1)));
return crc;
}

2
isam/pack_isam.c
View file

@ -738,7 +738,7 @@ static int get_statistic(MRG_INFO *mrg,HUFF_COUNTS *huff_counts)
{
if (! error)
{
crc^=checksum(record,reclength);
crc^=_nisam_checksum(record,reclength);
for (pos=record,count=huff_counts ;
count < end_count ;
count++,