From 26ee630756ebdd7c96bccede0881a8c8b98e8f2b Mon Sep 17 00:00:00 2001
From: Max Horn
Date: Sat, 11 Feb 2006 22:45:04 +0000
Subject: Moved engines to the new engines/ directory

svn-id: r20582
---
 engines/sword1/memman.cpp | 129 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 engines/sword1/memman.cpp

(limited to 'engines/sword1/memman.cpp')

diff --git a/engines/sword1/memman.cpp b/engines/sword1/memman.cpp
new file mode 100644
index 0000000000..b9b0dc5d24
--- /dev/null
+++ b/engines/sword1/memman.cpp
@@ -0,0 +1,129 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2003-2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#include "common/stdafx.h"
+#include "sword1/memman.h"
+#include "common/util.h"
+
+namespace Sword1 {
+
+MemMan::MemMan(void) {
+	_alloced = 0;
+	_memListFree = _memListFreeEnd = NULL;
+}
+
+MemMan::~MemMan(void) {
+	flush();
+	if (_alloced)
+		warning("deleting MemMan, still %d bytes alloced\n", _alloced);
+}
+
+void MemMan::alloc(MemHandle *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(MemHandle *bsMem) {
+	if (bsMem->cond != MEM_FREED) {
+		_alloced -= bsMem->size;
+		removeFromFreeList(bsMem);
+		free(bsMem->data);
+		bsMem->cond = MEM_FREED;
+	}
+}
+
+void MemMan::setCondition(MemHandle *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::flush(void) {
+	while (_memListFree) {
+		free(_memListFreeEnd->data);
+		_memListFreeEnd->data = NULL;
+		_memListFreeEnd->cond = MEM_FREED;
+		_alloced -= _memListFreeEnd->size;
+		removeFromFreeList(_memListFreeEnd);
+	}
+	if (_alloced)
+		warning("MemMan::flush: Something's wrong: still %d bytes alloced", _alloced);
+}
+
+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(MemHandle *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(MemHandle *bsMem) {
+	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(MemHandle *bsMem) {
+	memset(bsMem, 0, sizeof(MemHandle));
+}
+
+} // End of namespace Sword1
-- 
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