Initial commit of Command & Conquer Red Alert source code.

2025-12-16 07:31:39 -05:00 · 2025-02-27 16:15:05 +00:00
parent b685cea758
commit 5e733d5dcc
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--- a/WWFLAT32/MISC/ASM.ASM.BAK
+++ b/WWFLAT32/MISC/ASM.ASM.BAK
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+;
+;	Command & Conquer Red Alert(tm)
+;	Copyright 2025 Electronic Arts Inc.
+;
+;	This program 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.
+;
+;	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 General Public License for more details.
+;
+;	You should have received a copy of the GNU General Public License
+;	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+;
+
+;***************************************************************************
+;**   C O N F I D E N T I A L --- W E S T W O O D   A S S O C I A T E S   **
+;***************************************************************************
+;*                                                                         *
+;*                 Project Name : Westwood Library                         *
+;*                                                                         *
+;*                    File Name : CRC.ASM                                  *
+;*                                                                         *
+;*                   Programmer : Joe L. Bostic                            *
+;*                                                                         *
+;*                   Start Date : June 12, 1992                            *
+;*                                                                         *
+;*                  Last Update : February 10, 1995 [BWG]                  *
+;*                                                                         *
+;*-------------------------------------------------------------------------*
+;* Functions:                                                              *
+;* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - *
+
+IDEAL
+P386
+;MODEL USE32 FLAT
+MODEL	LARGE
+
+GLOBAL	C Calculate_CRC:FAR
+
+	CODESEG
+
+; LONG Calculate_CRC(VOID *buffer, LONG length);
+	PROC	Calculate_CRC C far
+	USES 	esi,ebx,ecx
+
+	ARG	buffer:DWORD
+	ARG	length:DWORD
+
+	LOCAL	crc:DWORD
+
+	; Load pointer to data block.
+	mov	[crc],0
+	pushf
+	mov	esi,[buffer]
+	cld
+
+	; Clear CRC to default (NULL) value.
+	xor	ebx,ebx
+
+	; Fetch the length of the data block to CRC.
+	mov	ecx,[length]
+	jecxz	short ??fini
+
+	; Prepare the length counters.
+	mov	edx,ecx
+	and	dl,011b
+	shr	ecx,2
+
+	; Perform the bulk of the CRC scanning.
+	jecxz	short ??remainder
+??accumloop:
+	lodsd
+	rol	ebx,1
+	add	ebx,eax
+	loop	??accumloop
+
+	; Handle the remainder bytes.
+??remainder:
+	or	dl,dl
+	jz	short ??fini
+	mov	ecx,edx
+	xor	eax,eax
+
+	and 	ecx,0FFFFh
+	push	ecx
+??nextbyte:
+	lodsb
+	ror	eax,8
+	loop	??nextbyte
+	pop	ecx
+	neg	ecx
+	add	ecx,4
+	shl	ecx,3
+	ror	eax,cl
+
+;??nextbyte:
+;	shl	eax,8
+;	lodsb
+;	loop	??nextbyte
+	rol	ebx,1
+	add	ebx,eax
+
+??fini:
+	mov	[crc],ebx
+	popf
+	mov	dx,[WORD PTR crc+2]
+	mov	ax,[WORD PTR crc]
+	ret
+
+	ENDP	Calculate_CRC
+
+	END
+