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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
parent ecc7001fbf
commit eb5f968c45
15 changed files with 119 additions and 85 deletions
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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;
}