277 lines
13 KiB
C++
277 lines
13 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 : Library - Fileio information functions. *
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* *
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* File Name : FILE.CPP *
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* *
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* Programmer : Scott K. Bowen *
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* *
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* Start Date : September 13, 1993 *
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* *
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* Last Update : April 19, 1994 [SKB] *
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* *
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*-------------------------------------------------------------------------*
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* Functions: *
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* Get_DOS_Handle -- Fetches system specific DOS file handle. *
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* Find_Disk_Number -- Determine disk a file resides upon. *
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* Set_File_Flags -- Sets flags for file if FileData table. *
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* Get_File_Flags -- Gets the flags on a file in the FileData table. *
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* Free_Handles -- Returns number of free file handles in WW system. *
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* Multi_Drive_Search -- Turns Multi search drive on and off. *
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* Clear_File_Flags -- Clears flags specified for file. *
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* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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#ifndef WWSTD_H
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#include "wwstd.h"
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#endif
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#ifndef _FILE_H
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#include "_file.h"
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#endif
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/*=========================================================================*/
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/* The following PRIVATE functions are in this file: */
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/*=========================================================================*/
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/*= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =*/
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/***************************************************************************
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* GET_DOS_HANDLE -- Fetches system specific DOS file handle. *
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* *
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* This routine will return with the system specific DOS file handle. *
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* On the IBM, this is a WORD, on the Amiga, it is a LONG (BPTR). Use *
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* this routine with caution, because the value returned is NOT *
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* portable. *
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* *
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* INPUT: fh -- Westwood file system handle. *
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* *
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* OUTPUT: Returns with the system DOS file handle (WORD or LONG). *
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* *
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* WARNINGS: If you pass in an invalid file handle, or a file handle *
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* that references a resident file, then the ERROR code is *
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* returned. Be SURE to check for this. *
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* *
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* HISTORY: *
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* 08/21/1991 JLB : Created. *
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* 11/09/1991 JLB : Checks for illegal file handle passed in. *
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*=========================================================================*/
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WORD cdecl Get_DOS_Handle(WORD fh)
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{
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/*
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** If an illegal file handle is passed in then always abort.
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*/
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if (fh >= 0 && fh < TABLE_MAX) {
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if (!FileHandleTable[fh].Empty || FileHandleTable[fh].Handle) {
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return(FileHandleTable[fh].Handle);
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}
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/*
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** If it falls through here, then the file must be resident. It is
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** illegal to get a DOS handle to a resident file.
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*/
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}
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return(FILEOPENERROR);
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}
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/***************************************************************************
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* FREE_HANDLES -- Returns number of free file handles in WW system. *
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* *
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* INPUT: NONE. *
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* *
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* OUTPUT: NONE. *
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* *
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* WARNINGS: *
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* *
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* HISTORY: *
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* 09/13/1993 SKB : Created. *
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*=========================================================================*/
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WORD cdecl Free_Handles(VOID)
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{
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WORD count; // Count of the number of free file handles.
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WORD index; // Working file handle index var.
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count = 0;
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for (index = 0; index < TABLE_MAX; index++) {
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if (FileHandleTable[index].Empty) count++;
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}
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return(count);
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}
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/***************************************************************************
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* FIND_DISK_NUMBER -- Determine disk a file resides upon. *
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* *
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* This routine will determine the disk number that the specified *
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* file resides upon. It determines this by scanning through the *
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* FileData table. If the specified file is a packed file, then it *
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* will reference the parent packed file to determine the disk number. *
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* *
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* INPUT: file_name -- Pointer to the file name to check. *
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* *
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* OUTPUT: Returns with the disk number that the file resides upon. If *
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* ERROR is returned, then the file does not exist in the *
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* FileTable. The number returned is 0=A, 1=B, etc. *
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* *
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* WARNINGS: none *
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* *
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* HISTORY: *
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* 11/22/1991 JLB : Created. *
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*=========================================================================*/
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WORD cdecl Find_Disk_Number(BYTE const *file_name)
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{
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FileDataType *filedata; // Pointer to the current FileData.
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WORD index; // FileTable index.
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index = Find_File_Index(file_name);
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if (index != ERROR) {
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filedata = &FileDataPtr[index];
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if (filedata->Flag & FILEF_PACKED) {
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return (Find_Disk_Number(FileDataPtr[filedata->Disk].Name));
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}
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return(filedata->Disk);
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}
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return (index);
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}
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/***************************************************************************
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* SET_FILE_FLAGS -- Sets flags for file if FileData table. *
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* *
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* INPUT: BYTE *filename - file to modify. *
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* WORD flags - flags to set in file. *
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* *
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* OUTPUT: WORD - if file found in FileData table. *
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* *
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* WARNINGS: *
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* *
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* HISTORY: *
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* 10/04/1993 SKB : Created. *
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*=========================================================================*/
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WORD cdecl Set_File_Flags(BYTE const *filename, WORD flags)
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{
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FileDataType *filedata; // Pointer to the current FileData.
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WORD index; // FileTable index.
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index = Find_File_Index(filename);
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if (index != ERROR) {
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filedata = &FileDataPtr[index];
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filedata->Flag |= flags;
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return (TRUE);
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}
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return (FALSE);
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}
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/***************************************************************************
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* CLEAR_FILE_FLAGS -- Clears flags specified for file. *
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* *
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* INPUT: BYTE *filename - file to modify. *
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* WORD flags - flags to set in file. *
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* *
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* OUTPUT: WORD - if file found in FileData table. *
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* *
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* WARNINGS: *
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* *
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* HISTORY: *
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* 04/19/1994 SKB : Created. *
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*=========================================================================*/
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WORD cdecl Clear_File_Flags(BYTE const *filename, WORD flags)
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{
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FileDataType *filedata; // Pointer to the current FileData.
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WORD index; // FileTable index.
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index = Find_File_Index(filename);
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if (index != ERROR) {
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filedata = &FileDataPtr[index];
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filedata->Flag &= ~flags;
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return (TRUE);
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}
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return (FALSE);
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}
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/***************************************************************************
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* GET_FILE_FLAGS -- Gets the flags on a file in the FileData table. *
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* *
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* *
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* INPUT: BYTE *filename - file to modify. *
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* *
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* OUTPUT: *
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* *
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* OUTPUT: WORD - if file found in FileData table. *
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* *
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* HISTORY: *
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* 10/04/1993 SKB : Created. *
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*=========================================================================*/
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WORD cdecl Get_File_Flags(BYTE const *filename)
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{
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FileDataType *filedata; // Pointer to the current FileData.
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WORD index; // FileTable index.
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index = Find_File_Index(filename);
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if (index != ERROR) {
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filedata = &FileDataPtr[index];
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return (filedata->Flag);
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}
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return (FALSE);
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}
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/***************************************************************************
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* MULTI_DRIVE_SEARCH -- Turns Multi search drive on and off. *
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* *
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* *
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* *
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* INPUT: *
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* *
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* OUTPUT: *
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* *
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* WARNINGS: *
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* *
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* HISTORY: *
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* 09/13/1993 SKB : Created. *
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*=========================================================================*/
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BOOL cdecl Multi_Drive_Search(BOOL on)
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{
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BOOL old;
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Hard_Error_Occured = 0;
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old = MultiDriveSearch;
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MultiDriveSearch = on;
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return(old);
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}
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