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CnC_Remastered_Collection/TIBERIANDAWN/MIXFILE.CPP
PG-SteveT 03416d24e1 Initial Source Code commit 
Initial commit of original Tiberian Dawn and Red Alert source code converted to build as DLLs, and compatible with the release version of Command & Conquer Remastered.
2020-05-27 12:16:20 -07:00

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//
// Copyright 2020 Electronic Arts Inc.
//
// TiberianDawn.DLL and RedAlert.dll and corresponding source code 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.
// TiberianDawn.DLL and RedAlert.dll and corresponding source code is distributed
// in the hope that it will be useful, but with permitted additional restrictions
// under Section 7 of the GPL. See the GNU General Public License in LICENSE.TXT
// distributed with this program. You should have received a copy of the
// GNU General Public License along with permitted additional restrictions
// with this program. If not, see https://github.com/electronicarts/CnC_Remastered_Collection
/* $Header: F:\projects\c&c\vcs\code\mixfile.cpv 2.18 16 Oct 1995 16:48:46 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 : Command & Conquer *
* *
* File Name : MIXFILE.CPP *
* *
* Programmer : Joe L. Bostic *
* *
* Start Date : August 8, 1994 *
* *
* Last Update : January 23, 1995 [JLB] *
* *
*---------------------------------------------------------------------------------------------*
* Functions: *
* MixFileClass::Cache -- Caches the named mixfile into RAM. *
* MixFileClass::Cache -- Loads this particular mixfile's data into RAM. *
* MixFileClass::Finder -- Finds the mixfile object that matches the name specified. *
* MixFileClass::Free -- Frees the allocated raw data block (not the index block). *
* MixFileClass::MixFileClass -- Constructor for mixfile object. *
* MixFileClass::Offset -- Determines if the file is in a mixfile and where its sublocation is.*
* MixFileClass::Offset -- Searches in mixfile for matching file and returns offset if found.*
* MixFileClass::Retrieve -- Retrieves a pointer to the specified data file. *
* MixFileClass::~MixFileClass -- Destructor for the mixfile object. *
* MixFileClass::Offset -- Determines the offset of the requested file from the mixfile system.*
* MixFileClass::Free -- Uncaches a cached mixfile. *
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#include "function.h"
#include <direct.h>
#include <fcntl.h>
#include <io.h>
#include <dos.h>
#include <errno.h>
#include <share.h>
#include "mixfile.h"
template<class T> int Compare(T const *obj1, T const *obj2) {
if (*obj1 < *obj2) return(-1);
if (*obj1 > *obj2) return(1);
return(0);
};
/*
** This is the pointer to the first mixfile in the list of mixfiles registered
** with the mixfile system.
*/
MixFileClass * MixFileClass::First = 0;
/***********************************************************************************************
* MixFileClass::Free -- Uncaches a cached mixfile. *
* *
* Use this routine to uncache a mixfile that has been cached. *
* *
* INPUT: filename -- Pointer to the filename of the mixfile that is to be uncached. *
* *
* OUTPUT: bool; Was the mixfile found and freed? *
* *
* WARNINGS: none *
* *
* HISTORY: *
* 01/23/1995 JLB : Created. *
*=============================================================================================*/
bool MixFileClass::Free(char const *filename)
{
MixFileClass * ptr = Finder(filename);
if (ptr) {
ptr->Free();
return(true);
}
return(false);
}
//#ifndef NOMEMCHECK
void MixFileClass::Free_All(void)
{
while (First) {
delete First;
}
}
//#endif
/***********************************************************************************************
* MixFileClass::~MixFileClass -- Destructor for the mixfile object. *
* *
* This destructor will free all memory allocated by this mixfile and will remove it from *
* the system. A mixfile removed in this fashion must be created anew in order to be *
* subsequent used. *
* *
* INPUT: none *
* *
* OUTPUT: none *
* *
* WARNINGS: none *
* *
* HISTORY: *
* 08/08/1994 JLB : Created. *
* 01/06/1995 JLB : Puts mixfile header table into EMS. *
*=============================================================================================*/
MixFileClass::~MixFileClass(void)
{
/*
** Deallocate any allocated memory.
*/
if (Filename) {
free((char *)Filename);
}
if (Data) {
delete [] Data;
}
if (Buffer) {
delete [] Buffer;
}
/*
** Unlink this mixfile object from the chain.
*/
if (this == First) {
First = (MixFileClass *)Get_Next();
} else {
Remove();
}
// Can't do this here since the link class destructor hasn't been called yet, so clearing out the data will mess up the
// linked list. How did this work before? Did the watcom compiler call the destructors in a different order?
// ST - 1/3/2019 5:34PM
//Zap();
}
/***********************************************************************************************
* MixFileClass::MixFileClass -- Constructor for mixfile object. *
* *
* This is the constructor for the mixfile object. It takes a filename and a memory *
* handler object and registers the mixfile object with the system. The index block is *
* allocated and loaded from disk by this routine. *
* *
* INPUT: filename -- Pointer to the filename of the mixfile object. *
* *
* OUTPUT: none *
* *
* WARNINGS: none *
* *
* HISTORY: *
* 08/08/1994 JLB : Created. *
*=============================================================================================*/
MixFileClass::MixFileClass(char const *filename)
{
CCFileClass file; // Working file object.
/*
** Load in the control block. It always remains resident.
*/
Data = 0;
Count = 0;
Buffer = 0;
file.Set_Name(filename);
Filename = strdup(file.File_Name());
if (!Force_CD_Available(RequiredCD)) {
Prog_End("MixFileClass::MixFileClass CD not found", true);
if (!RunningAsDLL) {
exit(EXIT_FAILURE);
}
return;
}
if (file.Is_Available(true)) {
FileHeader fileheader;
file.Open();
file.Read(&fileheader, sizeof(fileheader));
Count = fileheader.count;
DataSize = fileheader.size;
/*
** Load up the offset control array. This could be located in
** EMS if possible.
*/
Buffer = new SubBlock [Count];
if (Buffer) {
file.Read(Buffer, Count * sizeof(SubBlock));
}
file.Close();
} else {
// delete this;
return;
}
/*
** Raw data block starts uncached.
*/
Data = 0;
/*
** Attach to list of mixfiles.
*/
Zap();
if (!First) {
First = this;
} else {
Add_Tail(*First);
}
}
/***********************************************************************************************
* MixFileClass::Retrieve -- Retrieves a pointer to the specified data file. *
* *
* This routine will return with a pointer to the specified data file if the file resides *
* in memory. Otherwise, this routine returns NULL. Use this routine to access a resident *
* file directly rather than going through the process of pseudo disk access. This will *
* save both time and RAM. *
* *
* INPUT: filename -- Pointer to the filename of the data file to retrieve a pointer to. *
* *
* OUTPUT: Returns with a pointer to the data file's data. If the file is not in RAM, then *
* NULL is returned. *
* *
* WARNINGS: none *
* *
* HISTORY: *
* 08/23/1994 JLB : Created. *
*=============================================================================================*/
void const * MixFileClass::Retrieve(char const *filename) {
void *ptr = 0;
Offset(filename, &ptr);
// if (!ptr) {
// errno = ENOENT;
// File_Fatal(filename);
// }
return(ptr);
};
/***********************************************************************************************
* MixFileClass::Finder -- Finds the mixfile object that matches the name specified. *
* *
* This routine will scan through all registered mixfiles and return with a pointer to *
* the matching mixfile. If no mixfile could be found that matches the name specified, *
* then NULL is returned. *
* *
* INPUT: filename -- Pointer to the filename to search for. *
* *
* OUTPUT: Returns with a pointer to the matching mixfile -- if found. *
* *
* WARNINGS: none *
* *
* HISTORY: *
* 08/08/1994 JLB : Created. *
*=============================================================================================*/
MixFileClass * MixFileClass::Finder(char const *filename)
{
MixFileClass * ptr;
ptr = First;
while (ptr) {
if (stricmp(&ptr->Filename[strlen(ptr->Filename)-strlen(filename)], filename) == 0) {
return(ptr);
}
ptr = (MixFileClass *)ptr->Get_Next();
}
return(0);
}
/***********************************************************************************************
* MixFileClass::Cache -- Caches the named mixfile into RAM. *
* *
* This routine will cache the mixfile, specified by name, into RAM. *
* *
* INPUT: filename -- The name of the mixfile that should be cached. *
* *
* OUTPUT: bool; Was the cache successful? *
* *
* WARNINGS: This routine could go to disk for a very long time. *
* *
* HISTORY: *
* 08/08/1994 JLB : Created. *
*=============================================================================================*/
bool MixFileClass::Cache(char const *filename)
{
MixFileClass * mixer = Finder(filename);
if (mixer) {
return(mixer->Cache());
}
return(false);
}
/***********************************************************************************************
* MixFileClass::Cache -- Loads this particular mixfile's data into RAM. *
* *
* This load the mixfile data into ram for this mixfile object. This is the counterpart *
* to the Free() function. *
* *
* INPUT: none *
* *
* OUTPUT: bool; Was the file load successful? It could fail if there wasn't enough room *
* to allocate the raw data block. *
* *
* WARNINGS: This routine goes to disk for a potentially very long time. *
* *
* HISTORY: *
* 08/08/1994 JLB : Created. *
*=============================================================================================*/
bool MixFileClass::Cache(void)
{
if (Data) return(true);
Data = new char [DataSize];
if (Data) {
CCFileClass file(Filename);
file.Open();
file.Seek(sizeof(SubBlock) * Count + sizeof(FileHeader));
long actual = file.Read(Data, DataSize);
if (actual != DataSize) {
#ifdef GERMAN
Fatal("Korrupte .MIX-Datei \"%s\". Beim Versuch, %ld zu lesen, nur %ld gefunden.", Filename, DataSize, actual);
#else
#ifdef FRENCH
Fatal("Fichier .MIX corrumpu \"%s\". Essai de lecture de %ld, mais %ld obtenu.", Filename, DataSize, actual);
#else
Fatal("Corrupt .MIX file \"%s\". Tried to read %ld, but got %ld.", Filename, DataSize, actual);
#endif
#endif
}
file.Close();
return(true);
}
#ifdef GERMAN
Fatal("Kann Datei \"%s\" nicht laden.", Filename);
#else
#ifdef FRENCH
Fatal("Impossible de charger \"%s\".", Filename);
#else
Fatal("Unable to load \"%s\".", Filename);
#endif
#endif
return(false);
}
/***********************************************************************************************
* MixFileClass::Free -- Frees the allocated raw data block (not the index block). *
* *
* This routine will free the (presumably large) raw data block, but leave the index *
* block intact. By using this in conjunction with the Cache() function, one can maintain *
* tight control of memory usage. If the index block is desired to be freed, then the *
* mixfile object must be deleted. *
* *
* INPUT: none *
* *
* OUTPUT: none *
* *
* WARNINGS: none *
* *
* HISTORY: *
* 08/08/1994 JLB : Created. *
*=============================================================================================*/
void MixFileClass::Free(void)
{
if (Data) {
delete [] Data;
Data = 0;
}
}
/***********************************************************************************************
* MixFileClass::Offset -- Determines if the file is in a mixfile and where its sublocation is.*
* *
* This routine will scan through all registers mixfiles in an attempt to locate the file *
* in question. Whether the file is located in RAM or on disk does not restrict this *
* search operation. *
* *
* INPUT: filename -- The filename of the file to search within the mixfile system. *
* *
* realptr -- Pointer to pointer that will be filled with the RAM pointer to *
* the file if it happens to be in RAM. NULL if otherwise. *
* *
* mixfile -- Pointer to the mixfile object that contains the file in question. *
* *
* offset -- The offset to the start of the data of the file. If the file is *
* on disk then this is the offset from the start of the file, if *
* it is located in RAM, then it is the offset from the start of the *
* raw data block. *
* *
* size -- Pointer to where the size of the file will be stored. *
* *
* OUTPUT: bool; Was the file found in one of the mixfiles? The value stored in "realptr" *
* will be NULL if it is on disk, otherwise it is in RAM. *
* *
* WARNINGS: none *
* *
* HISTORY: *
* 08/08/1994 JLB : Created. *
*=============================================================================================*/
//int _USERENTRY Compare(MixFileClass::SubBlock const *, MixFileClass::SubBlock const *);
// int _USERENTRY compfunc(void const *ptr1, void const *ptr2)
int compfunc(void const *ptr1, void const *ptr2)
{
// long diff = *(long const *)ptr1 - *(long const *)ptr2;
// return FP_SEG(diff);
if (*(long const *)ptr1 < *(long const *)ptr2) return(-1);
if (*(long const *)ptr1 > *(long const *)ptr2) return(1);
return(0);
}
/***********************************************************************************************
* MixFileClass::Offset -- Determines the offset of the requested file from the mixfile system.*
* *
* This routine will take the falename specified and search through the mixfile system *
* looking for it. If the file was found, then the mixfile it was found int, the offset *
* from the start of the mixfile, and the size of the embedded file will be returned. *
* Using this method it is possible for the CCFileClass system to process it as a normal *
* file. *
* *
* INPUT: filename -- The filename to search for. *
* *
* realptr -- Stores a pointer to the start of the file in memory here. If the *
* file is not in memory, then NULL is stored here. *
* *
* mixfile -- The pointer to the corresponding mixfile is placed here. If no *
* mixfile was found that contains the file, then NULL is stored here. *
* *
* offset -- The starting offset from the beginning of the parent mixfile is *
* stored here. *
* *
* size -- The size of the embedded file is stored here. *
* *
* OUTPUT: bool; Was the file found? The file may or may not be resident, but it does exist *
* and can be opened. *
* *
* WARNINGS: none *
* *
* HISTORY: *
* 10/17/1994 JLB : Created. *
*=============================================================================================*/
bool MixFileClass::Offset(char const *filename, void ** realptr, MixFileClass ** mixfile, long * offset, long * size)
{
MixFileClass * ptr;
if (!filename) return(false);
/*
** Create the key block that will be used to binary search for the file.
*/
char file_name_copy[_MAX_PATH];
strcpy(file_name_copy, filename);
strupr(file_name_copy);
long crc = Calculate_CRC(file_name_copy, strlen(file_name_copy));
SubBlock key;
key.CRC = crc;
/*
** Sweep through all registered mixfiles, trying to find the file in question.
*/
ptr = First;
while (ptr) {
SubBlock * block;
/*
** Binary search for the file in this mixfile. If it is found, then extract the
** appropriate information and store it in the locations provided and then return.
*/
block = (SubBlock *)bsearch(&key, ptr->Buffer, ptr->Count, sizeof(SubBlock), compfunc);
if (block) {
if (mixfile) *mixfile = ptr;
if (size) *size = block->Size;
if (realptr) *realptr = 0;
if (offset) *offset = block->Offset;
if (realptr && ptr->Data) {
*realptr = Add_Long_To_Pointer(ptr->Data, block->Offset);
}
if (!ptr->Data && offset) {
*offset += sizeof(SubBlock) * ptr->Count + sizeof(FileHeader);
}
return(true);
}
/*
** Advance to next mixfile.
*/
ptr = (MixFileClass *)ptr->Get_Next();
}
/*
** All the mixfiles have been examined but no match was found. Return with the non success flag.
*/
return(false);
}
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