diff options
Diffstat (limited to 'mysys/checksum.c')
| -rw-r--r-- | mysys/checksum.c | 45 |
1 files changed, 26 insertions, 19 deletions
diff --git a/mysys/checksum.c b/mysys/checksum.c index 00861853945..1dd135c7ad9 100644 --- a/mysys/checksum.c +++ b/mysys/checksum.c @@ -1,30 +1,37 @@ -/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB - - This library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public - License as published by the Free Software Foundation; either - version 2 of the License, or (at your option) any later version. - - This library is distributed in the hope that it will be useful, +/* Copyright (C) 2000 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 - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with this library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, - MA 02111-1307, USA */ + 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 */ -/* Calculate a long checksum for a memoryblock. Used to verify pack_isam */ -#include <global.h> +#include <my_global.h> #include "my_sys.h" +/* + Calculate a long checksum for a memoryblock. Used to verify pack_isam + + SYNOPSIS + checksum() + mem Pointer to memory block + count Count of bytes +*/ + ulong checksum(const byte *mem, uint count) { ulong crc; - for (crc=0; count-- ; mem++) - crc=((crc << 1) + *((uchar*) mem)) + + for (crc= 0; count-- ; mem++) + crc= ((crc << 1) + *((uchar*) mem)) + test(crc & ((ulong) 1L << (8*sizeof(ulong)-1))); return crc; } |