RxFPC:start reorder source folder structure

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@5699 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/rx/trunk/rxtools/rxcrc.pas

@@ -0,0 +1,67 @@
+{ 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.
+