152 lines
6.5 KiB
C++
152 lines
6.5 KiB
C++
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/*
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** Command & Conquer Red Alert(tm)
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** Copyright 2025 Electronic Arts Inc.
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**
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** This program is free software: you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation, either version 3 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/***************************************************************************
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** 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 **
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***************************************************************************
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* *
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* Project Name : WWLIB *
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* *
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* File Name : GETCD.CPP *
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* *
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* Programmer : STEVE WETHERILL BASED ON JOE BOSTIC CODE *
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* *
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* Start Date : 5/13/94 *
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* *
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* Last Update : June 4, 1994 [SW] *
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* *
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*-------------------------------------------------------------------------*
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*-------------------------------------------------------------------------*
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* Functions: *
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* GetCDClass::GetCDClass -- default constructor *
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* GetCDClass::~GetCDClass -- destructor *
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* GetCDClass::GetCDDrive -- returns the logical CD drive *
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* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <dos.h>
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#include "wwstd.h"
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#include "playcd.h"
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#include "wwmem.h"
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/***************************************************************************
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* GetCDClass -- default constructor *
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* *
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* *
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* *
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* INPUT: *
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* none *
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* OUTPUT: *
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* none *
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* WARNINGS: *
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* *
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* HISTORY: *
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* 05/26/1994 SW : Created. *
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*=========================================================================*/
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GetCDClass::GetCDClass(VOID)
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{
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memset ( this , 0 , sizeof ( GetCDClass ) ) ;
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if (DPMI_real_alloc(2, &cdDrive_addrp, &largestp))
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exit(1);
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CDCount = 0;
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CDIndex = 0;
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/*
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** Set all CD drive placeholders to empty
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*/
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memset (CDDrives, NO_CD_DRIVE, MAX_CD_DRIVES);
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/*
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** Dos will only currently support one cd drive so just
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** set the first entry to it.
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*/
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GetCDDrives();
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}
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/***************************************************************************
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* GetCDClass -- destructor *
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* *
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* *
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* *
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* INPUT: *
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* none *
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* OUTPUT: *
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* none *
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* WARNINGS: *
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* *
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* HISTORY: *
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* 05/26/1994 SW: Created. *
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*=========================================================================*/
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GetCDClass::~GetCDClass(VOID)
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{
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if(cdDrive_addrp.seg)
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DPMI_real_free(cdDrive_addrp); // free up those conventional buffers
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}
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/***************************************************************************
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* GetCDDrive -- returns the logical CD drive *
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* *
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* *
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* *
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* INPUT: *
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* none *
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* OUTPUT: *
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* WORD logical_drive *
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* WARNINGS: *
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* *
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* HISTORY: *
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* 05/26/1994 SW : Created. *
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*=========================================================================*/
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void GetCDClass::GetCDDrives(VOID)
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{
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for (int lp = 0; lp < 26; lp++ ) {
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/*
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** This call determines if the current specifed drive is a
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** CD ROM drive.
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** Input:
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** AX = 150Bh
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** CX = CD rom drive letter to check (A = 0, B = 1)
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** Output:
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** AX = non zero if drive is a CD ROM, zero if it is not.
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** BX = Signature word (ADADh if CD rom extension are installed)
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*/
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sregs . es = cdDrive_addrp . seg ;
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regs . x . ebx = 0;
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regs . x . eax = 0x150B;
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regs . x . ecx = lp;
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DPMI_real_intr ( 0x2F , & regs , & sregs ) ;
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if (regs.x.ebx == 0xADAD && regs.x.eax != 0) {
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CDDrives[CDCount++] = lp;
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}
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}
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}
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/* ==================================================================== */
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