table checksum background:

   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 :))

1 files changed, 11 insertions, 10 deletions

diff --git a/mysys/checksum.c b/mysys/checksum.c
index 1dd135c7ad9..2ae139b81c3 100644
--- a/mysys/checksum.c
+++ b/mysys/checksum.c
@@ -19,19 +19,20 @@
 #include "my_sys.h"
 
 /*
-  Calculate a long checksum for a memoryblock. Used to verify pack_isam 
-   
+  Calculate a long checksum for a memoryblock.
+
   SYNOPSIS
-    checksum()
-      mem	Pointer to memory block
-      count	Count of bytes 
+    my_checksum()
+      crc       start value for crc
+      pos       pointer to memory block
+      length    length of the block
 */
 
-ulong checksum(const byte *mem, uint count)
+ha_checksum my_checksum(ha_checksum crc, const byte *pos, uint length)
 {
-  ulong crc;
-  for (crc= 0; count-- ; mem++)
-    crc= ((crc << 1) + *((uchar*) mem)) +
-      test(crc & ((ulong) 1L << (8*sizeof(ulong)-1)));
+  const byte *end=pos+length;
+  for ( ; pos != end ; pos++)
+    crc=((crc << 8) + *((uchar*) pos)) + (crc >> (8*sizeof(ha_checksum)-8));
   return crc;
 }
+