--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hedgewars/uRandom.pas	Mon Aug 22 13:35:41 2005 +0000
@@ -0,0 +1,75 @@
+(*
+ * Hedgewars, a worms-like game
+ * Copyright (c) 2004, 2005 Andrey Korotaev <unC0Rr@gmail.com>
+ *
+ * Distributed under the terms of the BSD-modified licence:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * with the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *)
+
+unit uRandom;
+interface
+uses uSHA;
+
+procedure SetRandomParams(Seed: shortstring; FillBuf: shortstring);
+function  GetRandom: real; overload;
+function  GetRandom(m: LongWord): LongWord; overload;
+
+implementation
+var  sc1, sc2: TSHA1Context;
+     Fill: shortstring;
+
+procedure SetRandomParams(Seed: shortstring; FillBuf: shortstring);
+begin
+SHA1Init(sc1);
+SHA1Update(sc1, @Seed, Length(Seed)+1);
+Fill:= FillBuf
+end;
+
+function GetRandom: real;
+var dig: TSHA1Digest;
+begin
+SHA1Update(sc1, @Fill[1], Length(Fill));
+sc2:= sc1;
+dig:= SHA1Final(sc1);
+Result:= frac( dig.LongWords[0]*0.0000731563977
+               + pi * dig.Words[6]
+               + 0.0109070019*dig.Words[9]);
+sc1:= sc2
+end;
+
+function  GetRandom(m: LongWord): LongWord;
+var dig: TSHA1Digest;
+begin
+SHA1Update(sc1, @Fill[1], Length(Fill));
+sc2:= sc1;
+dig:= SHA1Final(sc1);
+Result:= (((dig.LongWords[0] mod m) + (dig.LongWords[2] mod m)) mod m + (dig.LongWords[3] mod m)) mod m;
+sc1:= sc2
+end;
+
+end.