merged

mysys/Makefile.am

@@ -29,7 +29,7 @@ libmysys_a_SOURCES =	my_init.c my_getwd.c mf_getdate.c\
 			mf_path.c mf_loadpath.c\
 			my_open.c my_create.c my_dup.c my_seek.c my_read.c \
 			my_pread.c my_write.c \
-			mf_keycache.c \
+			mf_keycache.c my_crc32.c \
 			mf_iocache.c mf_iocache2.c mf_cache.c mf_tempfile.c \
 			mf_tempdir.c my_lock.c mf_brkhant.c my_alarm.c \
 			my_malloc.c my_realloc.c my_once.c mulalloc.c \

mysys/checksum.c

@@ -19,19 +19,22 @@
 #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;
+*/
+  return (ha_checksum)crc32((uint)crc, (const uchar *)pos, length);
 }
+

mysys/my_crc32.c

@@ -0,0 +1,36 @@
+/* Copyright (C) 2003 MySQL 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 */
+
+#include "mysys_priv.h"
+
+#ifndef HAVE_COMPRESS
+
+/* minimal set of defines for using crc32() from zlib codebase */
+#define _ZLIB_H
+#define ZEXPORT
+#define Z_NULL  0
+#define OF(args)  args
+#undef DYNAMIC_CRC_TABLE
+typedef uchar  Byte;
+typedef uchar  Bytef;
+typedef uint   uInt;
+typedef ulong  uLong;
+typedef ulong  uLongf;
+
+#include "../zlib/crc32.c"
+
+#endif
+