rcfile.cpp

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/*
**  Command & Conquer Generals Zero Hour(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  S T U D I O S               ***
 ***********************************************************************************************
 *                                                                                             *
 *                 Project Name : wwlib                                                        *
 *                                                                                             *
 *                     $Archive:: /Commando/Code/wwlib/rcfile.cpp                             $*
 *                                                                                             *
 *                       Author:: Greg Hjelstrom                                               *
 *                                                                                             *
 *                     $Modtime:: 7/09/99 1:37p                                               $*
 *                                                                                             *
 *                    $Revision:: 5                                                           $*
 *                                                                                             *
 *---------------------------------------------------------------------------------------------*
 * Functions:                                                                                  *
 * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 
 
#include "rcfile.h"
#include <stdlib.h>
 
const char * RESOURCE_FILE_TYPE_NAME = "File";
 
 
ResourceFileClass::ResourceFileClass(HMODULE hmodule, char const *filename) :
    ResourceName(NULL),
    hModule(NULL),
    FileBytes(NULL),
    FilePtr(NULL),
    EndOfFile(NULL)
{
    Set_Name(filename);
    HRSRC hresource = FindResource(hmodule,ResourceName,RESOURCE_FILE_TYPE_NAME);    
 
    if (hresource) {
        HGLOBAL hglob = LoadResource(hmodule,hresource);
        if (hglob) {
            FileBytes = (unsigned char *)LockResource(hglob);
            if (FileBytes) {
                FilePtr = FileBytes;
                EndOfFile = FileBytes + SizeofResource(hmodule,hresource);
            }
        }
    }
}
 
ResourceFileClass::~ResourceFileClass(void)                                    
{ 
    if (ResourceName) 
        free(ResourceName); 
}
 
char const * ResourceFileClass::Set_Name(char const *filename)
{
    if (ResourceName) {
        free(ResourceName);
        ResourceName = NULL;
    }
    if (filename) {
        ResourceName = strdup(filename);
    } 
    return ResourceName;
}
 
int ResourceFileClass::Read(void *buffer, int size)
{
    if (!FilePtr) return 0;
 
    if (FilePtr + size > EndOfFile) {
        size = EndOfFile - FilePtr;
    }
    memcpy(buffer,FilePtr,size);
    FilePtr += size;
    return size;
}
 
int ResourceFileClass::Seek(int pos, int dir)
{
    switch (dir) {
        case SEEK_SET:
            FilePtr = FileBytes + pos;
            break;
 
        case SEEK_CUR:
            FilePtr = FilePtr + pos;
            break;
 
        case SEEK_END:
            FilePtr = EndOfFile + pos;
            break;
    }
 
    if (FilePtr > EndOfFile) {
        FilePtr = EndOfFile;
    }
    if (FilePtr < FileBytes) {
        FilePtr = FileBytes;
    }
    
    return FilePtr - FileBytes;
}
 
int ResourceFileClass::Size(void)
{
    return EndOfFile - FileBytes;
}
 
void ResourceFileClass::Error(int /*error*/, int /*canretry*/, char const * /*filename*/)
{
}