TiberianDawn/CDFILE.CPP

/*
**	Command & Conquer(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/>.
*/

/* $Header:   F:\projects\c&c\vcs\code\cdfile.cpv   2.18   16 Oct 1995 16:48:10   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 : Westwood Library                                             *
 *                                                                                             *
 *                    File Name : CDFILE.CPP                                                   *
 *                                                                                             *
 *                   Programmer : Joe L. Bostic                                                *
 *                                                                                             *
 *                   Start Date : October 18, 1994                                             *
 *                                                                                             *
 *                  Last Update : October 18, 1994   [JLB]                                     *
 *                                                                                             *
 *---------------------------------------------------------------------------------------------*
 * Functions:                                                                                  *
 *   CDFileClass::Clear_Search_Drives -- Removes all record of a search path.                  *
 *   CDFileClass::Open -- Opens the file object -- with path search.                           *
 *   CDFileClass::Open -- Opens the file wherever it can be found.                             *
 *   CDFileClass::Set_Name -- Performs a multiple directory scan to set the filename.          *
 *   CDFileClass::Set_Search_Drives -- Sets a list of search paths for file access.            *
 * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

#include	"function.h"
//#include	"cdfile.h"

/*
**	Pointer to the first search path record.
*/
CDFileClass::SearchDriveType * CDFileClass::First = 0;

int  CDFileClass::CurrentCDDrive = 0;
int  CDFileClass::LastCDDrive = 0;
char CDFileClass::RawPath[512];



int __cdecl Is_Disk_Inserted(int disk)
{
	struct find_t fb;
	char	scan[] = "?:\\*.*";

	scan[0] = 'A' + disk;
	return(_dos_findfirst(scan, _A_SUBDIR, &fb) == 0);
}


CDFileClass::CDFileClass(char const *filename) :
	IsDisabled(false)
{
	Set_Name(filename);
	memset (RawPath, 0, sizeof(RawPath));
}


CDFileClass::CDFileClass(void) :
	IsDisabled(false)
{
}


/***********************************************************************************************
 * CDFileClass::Open -- Opens the file object -- with path search.                             *
 *                                                                                             *
 *    This will open the file object, but since the file object could have been constructed    *
 *    with a pathname, this routine will try to find the file first. For files opened for      *
 *    writing, then use the existing filename without performing a path search.                *
 *                                                                                             *
 * INPUT:   rights   -- The access rights to use when opening the file                         *
 *                                                                                             *
 * OUTPUT:  bool; Was the open successful?                                                     *
 *                                                                                             *
 * WARNINGS:   none                                                                            *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   10/18/1994 JLB : Created.                                                                 *
 *=============================================================================================*/
int CDFileClass::Open(int rights)
{
	return(RawFileClass::Open(rights));
}


/***********************************************************************************************
 * CDFC::Refresh_Search_Drives -- Updates the search path when a CD changes or is added        *
 *                                                                                             *
 *                                                                                             *
 *                                                                                             *
 * INPUT:    Nothing                                                                           *
 *                                                                                             *
 * OUTPUT:   Nothing                                                                           *
 *                                                                                             *
 * WARNINGS: None                                                                              *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *    5/22/96 9:01AM ST : Created                                                              *
 *=============================================================================================*/
void CDFileClass::Refresh_Search_Drives (void)
{
	Clear_Search_Drives();
	Set_Search_Drives(RawPath);
}





/***********************************************************************************************
 * CDFileClass::Set_Search_Drives -- Sets a list of search paths for file access.              *
 *                                                                                             *
 *    This routine sets up a list of search paths to use when accessing files. The path list   *
 *    is scanned if the file could not be found in the current directory. This is the primary  *
 *    method of supporting CD-ROM drives, but is also useful for scanning network and other    *
 *    directories. The pathlist as passed to this routine is of the same format as the path    *
 *    list used by DOS -- paths are separated by semicolons and need not end in an antivirgule.*
 *                                                                                             *
 *    If a path entry begins with "?:" then the question mark will be replaced with the first  *
 *    CD-ROM drive letter available. If there is no CD-ROM driver detected, then this path     *
 *    entry will be ignored. By using this feature, you can always pass the CD-ROM path        *
 *    specification to this routine and it will not break if the CD-ROM is not loaded (as in   *
 *    the case during development).                                                            *
 *                                                                                             *
 *    Here is an example path specification:                                                   *
 *                                                                                             *
 *       Set_Search_Drives("DATA;?:\DATA;F:\PROJECT\DATA");                                    *
 *                                                                                             *
 *    In this example, the current directory will be searched first, followed by a the         *
 *    subdirectory "DATA" located off of the current directory. If not found, then the CD-ROM  *
 *    will be searched in a directory called "\DATA". If not found or the CD-ROM is not        *
 *    present, then it will look to the hard coded path of "F:\PROJECTS\DATA" (maybe a         *
 *    network?). If all of these searches fail, the file system will default to the current    *
 *    directory and let the normal file error system take over.                                *
 *                                                                                             *
 * INPUT:   pathlist -- Pointer to string of path specifications (separated by semicolons)     *
 *                      that will be used to search for files.                                 *
 *                                                                                             *
 * OUTPUT:  none                                                                               *
 *                                                                                             *
 * WARNINGS:   none                                                                            *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   10/18/1994 JLB : Created.                                                                 *
 *   05/21/1996 ST  : Modified to recognise multiple CD drives                                 *
 *=============================================================================================*/
int CDFileClass::Set_Search_Drives(char * pathlist)
{
	int found = FALSE;
	int empty = FALSE;
	/*
	**	If there is no pathlist to add, then just return.
	*/
	if (!pathlist) return(0);

	/*
	** Save the path as it was passed in so we can parse it again later.
	** Check for the case where RawPath was passed in.
	*/
	if (pathlist != RawPath){
		strcat (RawPath, ";");
		strcat (RawPath, pathlist);
	}

	char const * ptr = strtok(pathlist, ";");
	while (ptr) {
		if (strlen(ptr)){

			char path[PATH_MAX];						// Working path buffer.

			/*
			**	Fixup the path to be legal. Legal is defined as all that is necessary to
			**	create a pathname is to append the actual filename submitted to the
			**	file system. This means that it must have either a trailing ':' or '\'
			**	character.
			*/
			strcpy(path, ptr);
			switch (path[strlen(path)-1]) {
				case ':':
				case '\\':
					break;

				default:
					strcat(path, "\\");
					break;
			}

			/*
			**	If there is a drive letter specified, and this drive letter is '?', then it should
			**	be substituted with the CD-ROM drive letter. In the case of no CD-ROM attached, then
			**	merely ignore this path entry.
			*/
			if (strncmp(path, "?:", 2) == 0) {
				if (CurrentCDDrive){
					found = TRUE;
					/*
					** If the drive has a C&C CD in it then add it to the path
					*/
					if (Get_CD_Index(CurrentCDDrive, 2*60) >= 0){
						path[0] = CurrentCDDrive + 'A';
						Add_Search_Drive(path);
					}
				}
				/*
				**	Find the next path string and resubmit.
				*/
				ptr = strtok(NULL, ";");
				continue;
			}

			found	= TRUE;
			Add_Search_Drive(path);
		}

		/*
		**	Find the next path string and resubmit.
		*/
		ptr = strtok(NULL, ";");
	}
	if (!found) return(1);
	if (empty) return(2);
	return(0);
}



/***********************************************************************************************
 * CDFC::Set_CD_Drive -- sets the current CD drive letter                                      *
 *                                                                                             *
 *                                                                                             *
 *                                                                                             *
 * INPUT:    Nothing                                                                           *
 *                                                                                             *
 * OUTPUT:   Nothing                                                                           *
 *                                                                                             *
 * WARNINGS: None                                                                              *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *    5/22/96 9:39AM ST : Created                                                              *
 *=============================================================================================*/

void CDFileClass::Set_CD_Drive (int drive)
{
	LastCDDrive = CurrentCDDrive;
	CurrentCDDrive = drive;
}



/***********************************************************************************************
 * CDFC::Add_Search_Drive -- Add a new path to the search path list                            *
 *                                                                                             *
 *                                                                                             *
 *                                                                                             *
 * INPUT:    path                                                                              *
 *                                                                                             *
 * OUTPUT:   Nothing                                                                           *
 *                                                                                             *
 * WARNINGS: None                                                                              *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *    5/22/96 10:12AM ST : Created                                                             *
 *=============================================================================================*/

void CDFileClass::Add_Search_Drive(char *path)
{
	SearchDriveType *srch;					// Working pointer to path object.
	/*
	**	Allocate a record structure.
	*/
	srch	= new SearchDriveType;

	/*
	**	Attach the path to this structure.
	*/
	srch->Path = strdup(path);
	srch->Next = NULL;

	/*
	**	Attach this path record to the end of the path chain.
	*/
	if (!First) {
		First = srch;
	} else {
		SearchDriveType * chain = First;

		while (chain->Next) {
			chain = (SearchDriveType *)chain->Next;
		}
		chain->Next = srch;
	}
}




/***********************************************************************************************
 * CDFileClass::Clear_Search_Drives -- Removes all record of a search path.                    *
 *                                                                                             *
 *    Use this routine to clear out any previous path(s) set with Set_Search_Drives()          *
 *    function.                                                                                *
 *                                                                                             *
 * INPUT:   none                                                                               *
 *                                                                                             *
 * OUTPUT:  none                                                                               *
 *                                                                                             *
 * WARNINGS:   none                                                                            *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   10/18/1994 JLB : Created.                                                                 *
 *=============================================================================================*/
void CDFileClass::Clear_Search_Drives(void)
{
	SearchDriveType	* chain;			// Working pointer to path chain.

	chain = First;
	while (chain) {
		SearchDriveType	*next;

		next = (SearchDriveType *)chain->Next;
		if (chain->Path) {
			free((char *)chain->Path);
		}
		delete chain;

		chain = next;
	}
	First = 0;
}


/***********************************************************************************************
 * CDFileClass::Set_Name -- Performs a multiple directory scan to set the filename.            *
 *                                                                                             *
 *    This routine will scan all the directories specified in the path list and if the file    *
 *    was found in one of the directories, it will set the filename to a composite of the      *
 *    correct directory and the filename. It is used to allow path searching when searching    *
 *    for files. Typical use is to support CD-ROM drives. This routine examines the current    *
 *    directory first before scanning through the path list. If after scanning the entire      *
 *    path list, the file still could not be found, then the file object's name is set with    *
 *    just the raw filename as passed to this routine.                                         *
 *                                                                                             *
 * INPUT:   filename -- Pointer to the filename to set as the name of this file object.        *
 *                                                                                             *
 * OUTPUT:  Returns a pointer to the final and complete filename of this file object. This     *
 *          may have a path attached to the file.                                              *
 *                                                                                             *
 * WARNINGS:   none                                                                            *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   10/18/1994 JLB : Created.                                                                 *
 *=============================================================================================*/
char const * CDFileClass::Set_Name(char const *filename)
{
	/*
	**	Try to find the file in the current directory first. If it can be found, then
	**	just return with the normal file name setting process. Do the same if there is
	**	no multi-drive search path.
	*/
	RawFileClass::Set_Name(filename);
	if (IsDisabled || !First || RawFileClass::Is_Available()) {
		return(File_Name());
	}

	/*
	**	Attempt to find the file first. Check the current directory. If not found there, then
	**	search all the path specifications available. If it still can't be found, then just
	**	fall into the normal raw file filename setting system.
	*/
	SearchDriveType * srch = First;

	while (srch) {
		char path[_MAX_PATH];

		/*
		**	Build a pathname to search for.
		*/
		strcpy(path, srch->Path);
		strcat(path, filename);

		/*
		**	Check to see if the file could be found. The low level Is_Available logic will
		**	prompt if necessary when the CD-ROM drive has been removed. In all other cases,
		**	it will return false and the search process will continue.
		*/
		RawFileClass::Set_Name(path);
		if (RawFileClass::Is_Available()) {
			return(File_Name());
		}

		/*
		**	It wasn't found, so try the next path entry.
		*/
		srch = (SearchDriveType *)srch->Next;
	}

	/*
	**	At this point, all path searching has failed. Just set the file name to the
	**	plain text passed to this routine and be done with it.
	*/
	RawFileClass::Set_Name(filename);
	return(File_Name());
}


/***********************************************************************************************
 * CDFileClass::Open -- Opens the file wherever it can be found.                               *
 *                                                                                             *
 *    This routine is similar to the RawFileClass open except that if the file is being        *
 *    opened only for READ access, it will search all specified directories looking for the    *
 *    file. If after a complete search the file still couldn't be found, then it is opened     *
 *    using the normal RawFileClass system -- resulting in normal error procedures.            *
 *                                                                                             *
 * INPUT:   filename -- Pointer to the override filename to supply for this file object. It    *
 *                      would be the base filename (sans any directory specification).         *
 *                                                                                             *
 *          rights   -- The access rights to use when opening the file.                        *
 *                                                                                             *
 * OUTPUT:  bool; Was the file opened successfully? If so then the filename may be different   *
 *                than requested. The location of the file can be determined by examining the  *
 *                filename of this file object. The filename will contain the complete         *
 *                pathname used to open the file.                                              *
 *                                                                                             *
 * WARNINGS:   none                                                                            *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   10/18/1994 JLB : Created.                                                                 *
 *=============================================================================================*/
int CDFileClass::Open(char const *filename, int rights)
{
	Close();

	/*
	**	Verify that there is a filename associated with this file object. If not, then this is a
	**	big error condition.
	*/
	if (!filename) {
		Error(ENOENT, false);
	}

	/*
	**	If writing is requested, then multiple drive searching is not performed.
	*/
	if (IsDisabled || rights == WRITE) {
		return(RawFileClass::Open(filename, rights));
	}

	/*
	**	Perform normal multiple drive searching for the filename and open
	**	using the normal procedure.
	*/
	Set_Name(filename);
	return(RawFileClass::Open(rights));
}


#ifdef NEVER
/* Get the drive letters if the CD's online */
WORD __cdecl GetCDDrive(VOID)
{
	_ES = FP_SEG(&cdDrive[0]);
	_BX = FP_OFF(&cdDrive[0]);
	_AX = 0x150d;
	geninterrupt(0x2F);
	return((WORD)(*cdDrive));
}
#endif

int Get_CD_Drive(void)
{
#ifdef NEVER
	for (int index = 0; index < 26; index++) {
		union REGS regs;

		regs.w.ax = 0x150B;
		regs.w.bx = 0;
		regs.w.cx = index;
		int386(0x2F, &regs, &regs);
		if (regs.w.bx == 0xADAD) {
			return(index);
		}
	}
	return(0);
#else

//	GetCDClass temp;
//	return(temp.GetCDDrive());
	return (0);
#endif

}