Initial Source Code commit

Initial commit of original Tiberian Dawn and Red Alert source code converted to build as DLLs, and compatible with the release version of Command & Conquer Remastered.

REDALERT/CRC.H

@@ -0,0 +1,118 @@
+//
+// Copyright 2020 Electronic Arts Inc.
+//
+// TiberianDawn.DLL and RedAlert.dll and corresponding source code 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 3 of the License, or (at your option) any later version.
+
+// TiberianDawn.DLL and RedAlert.dll and corresponding source code is distributed 
+// in the hope that it will be useful, but with permitted additional restrictions 
+// under Section 7 of the GPL. See the GNU General Public License in LICENSE.TXT 
+// distributed with this program. You should have received a copy of the 
+// GNU General Public License along with permitted additional restrictions 
+// with this program. If not, see https://github.com/electronicarts/CnC_Remastered_Collection
+
+/* $Header: /CounterStrike/CRC.H 1     3/03/97 10:24a Joe_bostic $ */
+/***********************************************************************************************
+ ***              C O N F I D E N T I A L  ---  W E S T W O O D  S T U D I O S               ***
+ ***********************************************************************************************
+ *                                                                                             *
+ *                 Project Name : Command & Conquer                                            *
+ *                                                                                             *
+ *                    File Name : CRC.H                                                        *
+ *                                                                                             *
+ *                   Programmer : Joe L. Bostic                                                *
+ *                                                                                             *
+ *                   Start Date : 03/02/96                                                     *
+ *                                                                                             *
+ *                  Last Update : March 2, 1996 [JLB]                                          *
+ *                                                                                             *
+ *---------------------------------------------------------------------------------------------*
+ * Functions:                                                                                  *
+ * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
+
+
+#ifndef CRC_H
+#define CRC_H
+
+#include	<stdlib.h>
+
+/*
+**	The "bool" integral type was defined by the C++ comittee in
+**	November of '94. Until the compiler supports this, use the following
+**	definition.
+*/
+#ifndef __BORLANDC__
+#ifndef TRUE_FALSE_DEFINED
+#define TRUE_FALSE_DEFINED
+enum {false=0,true=1};
+typedef int bool;
+#endif
+#endif
+
+/*
+**	This is a CRC engine class. It will process submitted data and generate a CRC from it.
+**	Well, actually, the value returned is not a true CRC. However, it shares the same strength
+**	characteristic and is faster to generate than the traditional CRC. This object is treated like
+**	a method class. If it is called as a function (using the function operator), it will return
+**	the CRC value. There are other function operators to submit data for processing.
+*/
+class CRCEngine {
+	public:
+
+		// Constructor for CRC engine (it can have an override initial CRC value).
+		CRCEngine(long initial=0) : CRC(initial), Index(0) {
+			StagingBuffer.Composite = 0;
+		};
+
+		// Fetches CRC value.
+		long operator() (void) const {return(Value());};
+
+		// Submits one byte sized datum to the CRC accumulator.
+		void operator() (char datum);
+
+		// Submits an arbitrary buffer to the CRC accumulator.
+		long operator() (void const * buffer, int length);
+
+		// Implicit conversion operator so this object appears like a 'long integer'.
+		operator long(void) const {return(Value());};
+
+	protected:
+
+		bool Buffer_Needs_Data(void) const {
+			return(Index != 0);
+		};
+
+		long Value(void) const {
+			if (Buffer_Needs_Data()) {
+				return(_lrotl(CRC, 1) + StagingBuffer.Composite);
+			}
+			return(CRC);
+		};
+
+		/*
+		**	Current accumulator of the CRC value. This value doesn't take into
+		**	consideration any pending data in the staging buffer.
+		*/
+		long CRC;
+
+		/*
+		**	This is the sub index into the staging buffer used to keep track of
+		**	partial data blocks as they are submitted to the CRC engine.
+		*/
+		int Index;
+
+		/*
+		**	This is the buffer that holds the incoming partial data. When the buffer
+		**	is filled, the value is transformed into the CRC and the buffer is flushed
+		**	in preparation for additional data.
+		*/
+		union {
+			long Composite;
+			char Buffer[sizeof(long)];
+		} StagingBuffer;
+};
+
+#endif
+