From 189e08bc7985fc5664e7ab95195bbade07488f48 Mon Sep 17 00:00:00 2001
From: Robert Göffringmann
Date: Tue, 16 Dec 2003 02:10:15 +0000
Subject: Broken Sword 1: initial import

svn-id: r11664
---
 sword1/memman.cpp | 123 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 sword1/memman.cpp

(limited to 'sword1/memman.cpp')

diff --git a/sword1/memman.cpp b/sword1/memman.cpp
new file mode 100644
index 0000000000..82e5fd7b8c
--- /dev/null
+++ b/sword1/memman.cpp
@@ -0,0 +1,123 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2003 The ScummVM project
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * $Header$
+ *
+ */
+
+#include "stdafx.h"
+#include "memman.h"
+#include "common/util.h"
+
+MemMan::MemMan(void) {
+	_alloced = 0;
+	_memListFree = _memListFreeEnd = NULL;
+}
+
+MemMan::~MemMan(void) {
+}
+
+void MemMan::alloc(BsMemHandle *bsMem, uint32 pSize, uint16 pCond) {
+	_alloced += pSize;
+	bsMem->data = (void*)malloc(pSize);
+	if (!bsMem->data)
+		error("MemMan::alloc(): Can't alloc %d bytes of memory.", pSize);
+	bsMem->cond = pCond;
+	bsMem->size = pSize;
+	if (pCond == MEM_CAN_FREE) {
+		warning("%d Bytes alloced as FREEABLE.", pSize); // why should one want to alloc mem if it can be freed?
+		addToFreeList(bsMem);
+	} else if (bsMem->next || bsMem->prev) // it's in our _freeAble list, remove it from there
+        removeFromFreeList(bsMem);
+	checkMemoryUsage();
+}
+
+void MemMan::freeNow(BsMemHandle *bsMem) {
+	if (bsMem->cond != MEM_FREED) {
+		_alloced -= bsMem->size;
+		removeFromFreeList(bsMem);
+		free(bsMem->data);
+		bsMem->cond = MEM_FREED;
+	}
+}
+
+void MemMan::setCondition(BsMemHandle *bsMem, uint16 pCond) {
+	if ((pCond == MEM_FREED) || (pCond > MEM_DONT_FREE))
+		error("MemMan::setCondition: program tried to set illegal memory condition");
+	if (bsMem->cond != pCond) {
+		bsMem->cond = pCond;
+		if (pCond == MEM_DONT_FREE)
+			removeFromFreeList(bsMem);
+		else if (pCond == MEM_CAN_FREE)
+			addToFreeList(bsMem);
+	}
+}
+
+void MemMan::checkMemoryUsage(void) {
+	while ((_alloced > MAX_ALLOC) && _memListFree) {
+		free(_memListFreeEnd->data);
+		_memListFreeEnd->data = NULL;
+		_memListFreeEnd->cond = MEM_FREED;
+		_alloced -= _memListFreeEnd->size;
+		removeFromFreeList(_memListFreeEnd);
+	}
+}
+
+void MemMan::addToFreeList(BsMemHandle *bsMem) {
+	if (bsMem->next || bsMem->prev) {
+		warning("addToFreeList: mem block is already in freeList");
+		return;
+	}
+	bsMem->prev = NULL;
+	bsMem->next = _memListFree;
+	if (bsMem->next)
+		bsMem->next->prev = bsMem;
+	_memListFree = bsMem;
+	if (!_memListFreeEnd)
+		_memListFreeEnd = _memListFree;
+}
+
+void MemMan::removeFromFreeList(BsMemHandle *bsMem) {
+	/*BsMemHandle *forw = _memListFree;
+	BsMemHandle *rev = _memListFreeEnd;
+
+	while (forw || rev) {
+		if (!(forw && rev))
+			error("mem list is completely fubared");
+		printf("%p <-> %p\n", forw, rev);
+		forw = forw->next;
+		rev = rev->prev;
+	}
+	printf("\n");*/
+	if (!(bsMem->prev || bsMem->next))
+		warning("removeFromFreeList: memory block wasn't in list");
+	if (_memListFree == bsMem)
+		_memListFree = bsMem->next;
+	if (_memListFreeEnd == bsMem)
+		_memListFreeEnd = bsMem->prev;
+
+	if (bsMem->next)
+		bsMem->next->prev = bsMem->prev;
+	if (bsMem->prev)
+		bsMem->prev->next = bsMem->next;
+	bsMem->next = bsMem->prev = NULL;
+}
+
+void MemMan::initHandle(BsMemHandle *bsMem) {
+	memset(bsMem, 0, sizeof(BsMemHandle));
+}
+
-- 
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