CnC_Remastered_Collection

Command and Conquer: Red Alert
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LZW.H (3799B)

      1 //
      2 // Copyright 2020 Electronic Arts Inc.
      3 //
      4 // TiberianDawn.DLL and RedAlert.dll and corresponding source code is free 
      5 // software: you can redistribute it and/or modify it under the terms of 
      6 // the GNU General Public License as published by the Free Software Foundation, 
      7 // either version 3 of the License, or (at your option) any later version.
      8 
      9 // TiberianDawn.DLL and RedAlert.dll and corresponding source code is distributed 
     10 // in the hope that it will be useful, but with permitted additional restrictions 
     11 // under Section 7 of the GPL. See the GNU General Public License in LICENSE.TXT 
     12 // distributed with this program. You should have received a copy of the 
     13 // GNU General Public License along with permitted additional restrictions 
     14 // with this program. If not, see https://github.com/electronicarts/CnC_Remastered_Collection
     15 
     16 /* $Header: /CounterStrike/LZW.H 1     3/03/97 10:25a Joe_bostic $ */
     17 /***********************************************************************************************
     18  ***              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               ***
     19  ***********************************************************************************************
     20  *                                                                                             *
     21  *                 Project Name : Command & Conquer                                            *
     22  *                                                                                             *
     23  *                    File Name : LZW.H                                                        *
     24  *                                                                                             *
     25  *                   Programmer : Joe L. Bostic                                                *
     26  *                                                                                             *
     27  *                   Start Date : 08/28/96                                                     *
     28  *                                                                                             *
     29  *                  Last Update : August 28, 1996 [JLB]                                        *
     30  *                                                                                             *
     31  *---------------------------------------------------------------------------------------------*
     32  * Functions:                                                                                  *
     33  * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     34 
     35 #ifndef _LZW_H
     36 #define _LZW_H
     37 
     38 #include	"buff.h"
     39 
     40 class LZWEngine
     41 {
     42 	public:
     43 		LZWEngine(void);
     44 
     45 		int Compress(Buffer const & input, Buffer const & output);
     46 		int Uncompress(Buffer const & input, Buffer const & output);
     47 
     48 		void Reset(void);
     49 
     50 	private:
     51 		typedef short CodeType;
     52 		struct CodeClass {
     53 			CodeType CodeValue;
     54 			CodeType ParentCode;
     55 			char CharValue;
     56 
     57 			CodeClass(void) {}
     58 			CodeClass(CodeType code, CodeType parent, char c) : CodeValue(code), ParentCode(parent), CharValue(c) {}
     59 
     60 			enum {UNUSED=-1};
     61 			void Make_Unused(void) {CodeValue = UNUSED;}
     62 			bool Is_Unused(void) const {return(CodeValue == UNUSED);}
     63 			bool Is_Matching(CodeType code, char c) const {return(ParentCode == code && CharValue == c);}
     64 		};
     65 
     66 		enum {
     67 			BITS=12,
     68 			MAX_CODE=((1 << BITS ) - 1),
     69 			FIRST_CODE=257,
     70 			END_OF_STREAM=256,
     71 			TABLE_SIZE=5021
     72 		};
     73 		CodeClass dict[TABLE_SIZE];
     74 
     75 		char decode_stack[TABLE_SIZE];
     76 
     77 		int Find_Child_Node(CodeType parent_code, char child_character);
     78 		int Decode_String(char * ptr, CodeType code);
     79 		static int Make_LZW_Hash(CodeType code, char character);
     80 };
     81 
     82 
     83 int LZW_Compress(Buffer const & inbuff, Buffer const & outbuff);
     84 int LZW_Uncompress(Buffer const & inbuff, Buffer const & outbuff);
     85 
     86 #endif