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mysys/array.c: Rewrite functions comments mysys/checksum.c: Rewrite function comment Style cleanup mysys/mulalloc.c: Rewrite function comment mysys/my_chsize.c: Rewrite function comment mysys/my_error.c: Rewrite comments mysys/my_once.c: Rewrite comments mysys/my_div.c: Rewrite comments mysys/my_open.c: Rewrite comments
37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include <my_global.h>
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#include "my_sys.h"
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/*
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Calculate a long checksum for a memoryblock. Used to verify pack_isam
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SYNOPSIS
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checksum()
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mem Pointer to memory block
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count Count of bytes
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*/
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ulong checksum(const byte *mem, uint count)
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{
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ulong crc;
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for (crc= 0; count-- ; mem++)
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crc= ((crc << 1) + *((uchar*) mem)) +
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test(crc & ((ulong) 1L << (8*sizeof(ulong)-1)));
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return crc;
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}
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