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CnC_Remastered_Collection/REDALERT/WIN32LIB/ALLOC.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
/***************************************************************************
** 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 **
***************************************************************************
* *
* Project Name : Westwood Library *
* *
* File Name : ALLOC.CPP *
* *
* Programmer : Joe L. Bostic *
* *
* Start Date : February 1, 1992 *
* *
* Last Update : March 9, 1995 [JLB] *
* *
*-------------------------------------------------------------------------*
* Functions: *
* Alloc -- Allocates system RAM. *
* Ram_Free -- Determines the largest free chunk of RAM. *
* Free -- Free an Alloc'ed block of RAM. *
* Resize_Alloc -- Change the size of an allocated block. *
* Heap_Size -- Size of the heap we have. *
* Total_Ram_Free -- Total amount of free RAM. *
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#include <malloc.h>
#include <string.h>
#include <stdlib.h>
//#include <dos.h>
//#include <bios.h>
#ifndef WWMEM_H
#include "wwmem.h"
#endif
extern "C" unsigned long Largest_Mem_Block ( void ) ;
/*
** Define the equates necessary to call a DPMI interrupt.
*/
#define DPMI_INT 0x0031
#define DPMI_LOCK_MEM 0x0600
#define DPMI_UNLOCK_MEM 0x0601
/*=========================================================================*/
/* The following PRIVATE functions are in this file: */
/*=========================================================================*/
/*= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =*/
unsigned long MinRam=0L; // Record of least memory at worst case.
unsigned long MaxRam=0L; // Record of total allocated at worst case.
static unsigned long TotalRam = 0L;
static unsigned long Memory_Calls = 0L;
void (*Memory_Error)(void) = NULL;
extern void (*Memory_Error_Exit)(char *string)=NULL;
//#define MEM_CHECK
#ifdef MEM_CHECK
extern "C"{
extern void __cdecl Int3(void);
}
#endif //MEM_CHECK
/***************************************************************************
* DPMI_LOCK -- handles locking a block of DPMI memory *
* *
* INPUT: *
* *
* OUTPUT: *
* *
* WARNINGS: *
* *
* HISTORY: *
* 06/23/1995 PWG : Created. *
*=========================================================================*/
#include"mono.h"
void DPMI_Lock(VOID const *, long const )
{
}
/***************************************************************************
* DPMI_UNLOCK -- Handles unlocking a locked block of DPMI *
* *
* INPUT: *
* *
* OUTPUT: *
* *
* WARNINGS: *
* *
* HISTORY: *
* 06/23/1995 PWG : Created. *
*=========================================================================*/
void DPMI_Unlock(void const *, long const )
{
}
/***************************************************************************
* Alloc -- Allocates system RAM. *
* *
* This is the basic RAM allocation function. It is used for all *
* memory allocations needed by the system or the main program. *
* *
* INPUT: bytes_to_alloc -- LONG value of the number of bytes to alloc. *
* *
* flags -- Memory allocation control flags. *
* MEM_NORMAL: No special flags. *
* MEM_CLEAR: Zero out memory block. *
* MEM_NEW: Called by a new. *
* *
* OUTPUT: Returns with pointer to allocated block. If NULL was returned *
* it indicates a failure to allocate. Note: NULL will never be *
* returned if the standard library allocation error routine is *
* used. *
* *
* WARNINGS: If you replace the standard memory allocation error routine *
* and make it so that Alloc CAN return with a NULL, be sure *
* and check for this in your code. *
* *
* HISTORY: *
* 09/03/1991 JLB : Documented. *
* 08/09/1993 JLB : Updated with EMS memory support. *
* 04/28/1994 JAW : Updated to 32bit Protected mode. *
* 03/09/1995 JLB : Fixed *
* 09/28/1995 ST : Simplified for win95 *
*=========================================================================*/
void *Alloc(unsigned long bytes_to_alloc, MemoryFlagType flags)
{
#ifdef WIN32
void *mem_ptr;
#ifdef MEM_CHECK
bytes_to_alloc += 32;
#endif //MEM_CHECK
mem_ptr = malloc ( bytes_to_alloc );
if ( !mem_ptr && Memory_Error ){
Memory_Error();
}
if ( mem_ptr && ( flags & MEM_CLEAR ) ){
memset ( mem_ptr , 0 , bytes_to_alloc );
}
#ifdef MEM_CHECK
mem_ptr = (void*)((char*)mem_ptr + 16);
unsigned long *magic_ptr =(unsigned long*) ( ((char *)mem_ptr) - 16 );
*magic_ptr++ = (unsigned long)mem_ptr;
*magic_ptr++ = (unsigned long)mem_ptr;
*magic_ptr++ = (unsigned long)mem_ptr;
*magic_ptr = bytes_to_alloc - 32;
magic_ptr = (unsigned long*) ( ((char*)mem_ptr) + bytes_to_alloc - 32 );
*magic_ptr++ = (unsigned long)mem_ptr;
*magic_ptr++ = (unsigned long)mem_ptr;
*magic_ptr++ = (unsigned long)mem_ptr;
*magic_ptr = (unsigned long)mem_ptr;
#endif //MEM_CHECK
Memory_Calls++;
return ( mem_ptr );
#else
union REGS regs ;
struct SREGS sregs ;
unsigned char *retval=NULL; // Pointer to allocated block.
unsigned long original_size; // Original allocation size.
unsigned long bytesfree; // Number of free bytes.
long *longptr=NULL; // Pointer used to store selector
/*
** Save the original allocated space size so that we can clear the
** exact amount of RAM if they specified MEM_CLEAR.
*/
original_size = bytes_to_alloc;
/*
** Reserve one byte for the header of the memory we allocated.
** We will store the flags variable there for later use.
*/
bytes_to_alloc += (flags & MEM_LOCK) ? 5 : 1;
/*
** Initialize the total ram available value.
*/
if (!TotalRam) {
TotalRam = Total_Ram_Free(MEM_NORMAL);
}
// Try to allocate the memory out of the protected mode memory
// chain if we did not require a real mode allocation. If this
// fails we will have to try to allocate it out of real mode memory.
// Real mode memory is a last resort because some types of applications
// require real mode memory.
if (!(flags & MEM_REAL)) {
retval = (unsigned char*)malloc(bytes_to_alloc);
}
// Try to allocate the memory out of the real mode memory using DPMI
// service 0x100. Note that retval will be null if we are requesting
// real mode memory so that we do not have to explicitly check for the
// real mode flag. Remember we need to reserve room for the dos
// selector value at the beginning of our allocated block so rather than
// adding fifteen and rounding, we need to add 19 and round.
if (!retval) {
flags = (MemoryFlagType)(flags | MEM_REAL);
regs.x.eax = 0x100;
regs.x.ebx = (bytes_to_alloc + 19) >> 4;
if (regs.x.ebx & 0xFFFF0000) {
retval = NULL;
} else {
segread ( & sregs ) ;
int386x ( 0x31 , & regs, & regs , & sregs ) ;
if (regs.x.cflag)
retval = NULL;
else {
longptr = (long *)(((regs.x.eax & 0xFFFF) << 4)+ 1);
*longptr++ = regs.x.edx & 0xFFFF;
retval = (unsigned char *)longptr;
}
}
}
// If the alloc failed then we need to signify a memory error.
if (retval == NULL) {
if(Memory_Error != NULL)
Memory_Error();
return NULL;
}
// If the memory needs to be DPMI locked then we should store the
// original size in the header before we store the flags.
if (flags & MEM_LOCK) {
longptr = (long *)retval;
*longptr++ = original_size;
retval = (unsigned char *)longptr;
}
// Now that we know the alloc was sucessful (and for an extra byte
// more than the user wanted) we need to stick in the memory flags.
*retval++ = flags;
// If the memory needed to be DPMI locked then set it up so it
// is locked.
if (flags & MEM_LOCK) {
DPMI_Lock(retval, original_size);
}
/* Clear the space if they wanted it clear */
if (flags & MEM_CLEAR) {
unsigned char *ptr; // Working memory block pointer.
ptr = retval;
memset(ptr, '\0', original_size);
}
bytesfree = Total_Ram_Free(MEM_NORMAL);
if (bytesfree < MinRam) {
MinRam = bytesfree;
}
if (TotalRam-bytesfree > MaxRam) {
MaxRam = TotalRam-bytesfree;
}
Memory_Calls++;
return(retval);
#endif
}
/***************************************************************************
* Free -- Free an Alloc'ed block of RAM. *
* *
* FUNCTION: *
* *
* INPUT: A pointer to a block of RAM from Alloc. *
* *
* OUTPUT: None. *
* *
* WARNINGS: Don't use this for an Alloc_Block'ed RAM block. *
* *
* HISTORY: *
* 05/25/1990 : Created. *
***************************************************************************/
#ifdef WIN32
void Free(void const *pointer)
{
if ( pointer ){
#ifdef MEM_CHECK
unsigned long *magic_ptr = (unsigned long*) ( ((char*)pointer) - 16 );
if (*magic_ptr++ != (unsigned long)pointer ||
*magic_ptr++ != (unsigned long)pointer ||
*magic_ptr++ != (unsigned long)pointer ){
Int3();
}
magic_ptr = (unsigned long*) ( ((char*)pointer) + *magic_ptr );
if (*magic_ptr++ != (unsigned long)pointer ||
*magic_ptr++ != (unsigned long)pointer ||
*magic_ptr++ != (unsigned long)pointer ||
*magic_ptr++ != (unsigned long)pointer ){
Int3();
}
pointer = (void*) (((char*)pointer)-16);
#endif //MEM_CHECK
free ( (void*)pointer );
Memory_Calls--;
}
#else
void Free(void const *pointer)
{
union REGS regs ;
struct SREGS sregs ;
if (pointer) {
/*
** Get a pointer to the flags that we stored off.
*/
char *byteptr = ((char *)pointer) - 1;
/*
** Check to see if this was locked me and if it was unlock it.
*/
if (*byteptr & MEM_LOCK) {
long *longptr = ((long *)byteptr) - 1;
DPMI_Unlock(pointer, *longptr);
pointer = (void *)longptr;
} else
pointer = (void *)byteptr;
// If the pointer is a real mode pointer than it will point to the
// first megabyte of system memory. If it does than we need to
// use DPMI to free it.
if (*byteptr & MEM_REAL) {
regs.x.eax = 0x101;
regs.x.edx = *(((long *)pointer) - 1);
segread ( & sregs ) ;
int386x(0x31, &regs, &regs, &sregs);
} else {
free((void *)pointer);
}
Memory_Calls--;
}
#endif
}
/***************************************************************************
* Resize_Alloc -- Change the size of an allocated block. *
* *
* This routine will take a previously allocated block and change its *
* size without unnecessarily altering its contents. *
* *
* INPUT: pointer -- Pointer to the original memory allocation. *
* *
* new_size -- Size in bytes that it will be converted to. *
* *
* OUTPUT: Returns with a pointer to the new allocation. *
* *
* WARNINGS: ??? *
* *
* HISTORY: *
* 02/01/1992 JLB : Commented. *
*=========================================================================*/
void *Resize_Alloc(void *original_ptr, unsigned long new_size_in_bytes)
{
unsigned long *temp;
temp = (unsigned long*)original_ptr;
/* ReAlloc the space */
temp = (unsigned long *)realloc(temp, new_size_in_bytes);
if (temp == NULL) {
if(Memory_Error != NULL)
Memory_Error();
return NULL;
}
return(temp);
}
/***************************************************************************
* Ram_Free -- Determines the largest free chunk of RAM. *
* *
* Use this routine to determine the largest free chunk of available *
* RAM for allocation. It also performs a check of the memory chain. *
* *
* INPUT: none *
* *
* OUTPUT: Returns with the size of the largest free chunk of RAM. *
* *
* WARNINGS: This does not return the TOTAL memory free, only the *
* largest free chunk. *
* *
* HISTORY: *
* 09/03/1991 JLB : Commented. *
*=========================================================================*/
long Ram_Free(MemoryFlagType)
{
// return(_memmax());
#if(0)
MEMORYSTATUS mem_info;
mem_info.dwLength=sizeof(mem_info);
GlobalMemoryStatus(&mem_info);
return ( mem_info.dwAvailPhys );
#endif
return ( 64*1024*1024 );
}
/***************************************************************************
* Heap_Size -- Size of the heap we have. *
* *
* *
* *
* INPUT: *
* *
* OUTPUT: *
* *
* WARNINGS: *
* *
* HISTORY: *
* 06/21/1994 SKB : Created. *
*=========================================================================*/
long Heap_Size(MemoryFlagType )
{
if (!TotalRam) {
TotalRam = Total_Ram_Free(MEM_NORMAL);
}
return(TotalRam);
}
/***************************************************************************
* Total_Ram_Free -- Total amount of free RAM. *
* *
* *
* *
* INPUT: *
* *
* OUTPUT: *
* *
* WARNINGS: *
* *
* HISTORY: *
* 06/21/1994 SKB : Created. *
* 03/09/1995 JLB : Uses prerecorded heap size maximum. *
*=========================================================================*/
long Total_Ram_Free(MemoryFlagType )
{
#if(0)
MEMORYSTATUS mem_info;
mem_info.dwLength=sizeof(mem_info);
GlobalMemoryStatus(&mem_info);
return ( mem_info.dwAvailPhys );
#endif
return ( 64*1024*1024 );
}
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