You've already forked lazarus-ccr
68 lines
2.2 KiB
ObjectPascal
68 lines
2.2 KiB
ObjectPascal
|
{ rxCRC unit
|
||
|
|
|
||
|
|
Copyright (C) 2005-2017 Lagunov Aleksey alexs@yandex.ru and Lazarus team
|
||
|
|
original conception from rx library for Delphi (c)
|
||
|
|
|
||
|
|
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 with the following modification:
|
||
|
|
|
||
|
|
As a special exception, the copyright holders of this library give you
|
||
|
|
permission to link this library with independent modules to produce an
|
||
|
|
executable, regardless of the license terms of these independent modules,and
|
||
|
|
to copy and distribute the resulting executable under terms of your choice,
|
||
|
|
provided that you also meet, for each linked independent module, the terms
|
||
|
|
and conditions of the license of that module. An independent module is a
|
||
|
|
module which is not derived from or based on this library. If you modify
|
||
|
|
this library, you may extend this exception to your version of the library,
|
||
|
|
but you are not obligated to do so. If you do not wish to do so, delete this
|
||
|
|
exception statement from your 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.
|
||
|
|
}
|
||
|
|
|
||
|
|
unit rxCRC;
|
||
|
|
|
||
|
|
{$mode objfpc}{$H+}
|
||
|
|
|
||
|
|
interface
|
||
|
|
|
||
|
|
uses
|
||
|
|
Classes, SysUtils;
|
||
|
|
|
||
|
|
function crc8(Buffer:String;Polynom,Initial:Cardinal):Cardinal;
|
||
|
|
implementation
|
||
|
|
|
||
|
|
{autor - hansotten
|
||
|
|
http://forum.lazarus.freepascal.org/index.php?topic=31532.msg202338#msg202338
|
||
|
|
}
|
||
|
|
function crc8(Buffer:String;Polynom,Initial:Cardinal):Cardinal;
|
||
|
|
var
|
||
|
|
i,j : Integer;
|
||
|
|
begin
|
||
|
|
Result:=Initial;
|
||
|
|
for i:=1 to Length(Buffer) do
|
||
|
|
begin
|
||
|
|
Result:=Result xor Ord(buffer[i]);
|
||
|
|
for j:=0 to 7 do
|
||
|
|
begin
|
||
|
|
if (Result and $80)<>0 then
|
||
|
|
Result:=(Result shl 1) xor Polynom
|
||
|
|
else
|
||
|
|
Result:=Result shl 1;
|
||
|
|
end;
|
||
|
|
end;
|
||
|
|
Result:=Result and $ff;
|
||
|
|
end;
|
||
|
|
|
||
|
|
end.
|
||
|
|
|