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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
/*
* This code is based on Labyrinth of Time code with assistance of
*
* Copyright (c) 1993 Terra Nova Development
* Copyright (c) 2004 The Wyrmkeep Entertainment Co.
*
*/
#include "lab/stddefines.h"
#include "lab/parsetypes.h"
namespace Lab {
/* Have to make sure that ROOMBUFFERSIZE is bigger than the biggest piece of memory
that we need */
#define ROOMBUFFERSIZE (2 * 20480L)
#define EMPTYROOM ((uint16) -1)
#define MAXMARKERS 10
extern RoomData *Rooms;
extern uint16 ManyRooms;
typedef struct {
uint16 RoomNum;
void *Start0, *End0, *Start1, *End1;
} RoomMarker;
static RoomMarker RoomMarkers[MAXMARKERS];
static void *RoomBuffer = NULL;
static uint16 CurMarker = 0;
static void *MemPlace = NULL, *NextMemPlace = NULL;
static int32 MemLeftInBuffer = 0L;
/*****************************************************************************/
/* Allocates the memory for the room buffers. */
/*****************************************************************************/
bool initRoomBuffer(void) {
uint16 counter;
CurMarker = 0;
if ((RoomBuffer = calloc(ROOMBUFFERSIZE, 1))) {
MemPlace = RoomBuffer;
MemLeftInBuffer = ROOMBUFFERSIZE;
for (counter = 0; counter < MAXMARKERS; counter++)
RoomMarkers[counter].RoomNum = EMPTYROOM;
return true;
} else
return false;
}
/*****************************************************************************/
/* Frees the memory for the room buffers. */
/*****************************************************************************/
void freeRoomBuffer(void) {
if (RoomBuffer)
free(RoomBuffer);
}
/*****************************************************************************/
/* Frees a room's resources. */
/*****************************************************************************/
static void freeRoom(uint16 RMarker) {
uint16 RoomNum;
RoomNum = RoomMarkers[RMarker].RoomNum;
if (RoomNum != EMPTYROOM) {
Rooms[RoomNum].NorthView = NULL;
Rooms[RoomNum].SouthView = NULL;
Rooms[RoomNum].EastView = NULL;
Rooms[RoomNum].WestView = NULL;
Rooms[RoomNum].RuleList = NULL;
Rooms[RoomNum].RoomMsg = NULL;
}
RoomMarkers[RMarker].RoomNum = EMPTYROOM;
RoomMarkers[RMarker].Start0 = NULL;
RoomMarkers[RMarker].End0 = NULL;
RoomMarkers[RMarker].Start1 = NULL;
RoomMarkers[RMarker].End1 = NULL;
}
/*****************************************************************************/
/* Gets a chunk of memory from the buffer. */
/*****************************************************************************/
static void *getCurMem(uint16 Size) {
uint16 counter;
void *Ptr, *Start0, *Start1, *End0, *End1;
if (((int32) Size) > MemLeftInBuffer) {
MemPlace = RoomBuffer;
MemLeftInBuffer = ROOMBUFFERSIZE;
NextMemPlace = NULL;
}
Ptr = MemPlace;
MemPlace = (char *)MemPlace + Size;
MemLeftInBuffer -= Size;
if (MemPlace > NextMemPlace) {
NextMemPlace = NULL;
for (counter = 0; counter < MAXMARKERS; counter++) {
if (RoomMarkers[counter].RoomNum != EMPTYROOM) {
Start0 = RoomMarkers[counter].Start0;
Start1 = RoomMarkers[counter].Start1;
End0 = RoomMarkers[counter].End0;
End1 = RoomMarkers[counter].End1;
if (((Start0 >= Ptr) && (Start0 < MemPlace)) ||
((End0 >= Ptr) && (End0 < MemPlace)) ||
((Ptr >= Start0) && (Ptr <= End0)) ||
((Start1 >= Ptr) && (Start1 < MemPlace)) ||
((End1 >= Ptr) && (End1 < MemPlace)) ||
((Ptr >= Start1) && (Ptr <= End1))) {
freeRoom(counter);
} else {
if (Start0 >= MemPlace)
if ((NextMemPlace == NULL) || (Start0 < NextMemPlace))
NextMemPlace = Start0;
if (Start1 >= MemPlace)
if ((NextMemPlace == NULL) || (Start1 < NextMemPlace))
NextMemPlace = Start1;
}
}
}
if (NextMemPlace == NULL) {
NextMemPlace = RoomBuffer;
NextMemPlace = (char *)NextMemPlace + ROOMBUFFERSIZE;
}
}
return Ptr;
}
/*****************************************************************************/
/* Grabs a chunk of memory from the room buffer, and manages it for a */
/* particular room. */
/*****************************************************************************/
void allocRoom(void **Ptr, uint16 size, uint16 roomNum) {
uint16 rMarker;
bool doit = true;
if (1 & size) /* Memory is required to be even aligned */
size++;
rMarker = 0;
while ((rMarker < MAXMARKERS) && doit) {
if (RoomMarkers[rMarker].RoomNum == roomNum)
doit = false;
else
rMarker++;
}
if (rMarker >= MAXMARKERS) {
rMarker = CurMarker;
CurMarker++;
if (CurMarker >= MAXMARKERS)
CurMarker = 0;
freeRoom(rMarker);
RoomMarkers[rMarker].RoomNum = roomNum;
}
*Ptr = getCurMem(size);
if (RoomMarkers[rMarker].Start0 == NULL) {
RoomMarkers[rMarker].Start0 = *Ptr;
RoomMarkers[rMarker].End0 = (void *)(((char *)(*Ptr)) + size - 1);
} else if (*Ptr < RoomMarkers[rMarker].Start0) {
if (RoomMarkers[rMarker].Start1 == NULL)
RoomMarkers[rMarker].Start1 = *Ptr;
RoomMarkers[rMarker].End1 = (void *)(((char *)(*Ptr)) + size - 1);
} else
RoomMarkers[rMarker].End0 = (void *)(((char *)(*Ptr)) + size - 1);
}
} // End of namespace Lab
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