We need a stack. Using the one from bfs.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1356 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/media/TStack.h

@@ -0,0 +1,58 @@
+#ifndef STACK_H
+#define STACK_H
+/* Stack - a template stack class
+**
+** Copyright 2001 pinc Software. All Rights Reserved.
+** This file may be used under the terms of the OpenBeOS License.
+*/
+
+
+#include <SupportDefs.h>
+
+
+template<class T> class Stack {
+	public:
+		Stack()
+			:
+			fArray(NULL),
+			fUsed(0),
+			fMax(0)
+		{
+		}
+		
+		~Stack()
+		{
+			if (fArray)
+				free(fArray);
+		}
+		
+		status_t Push(T value)
+		{
+			if (fUsed >= fMax) {
+				fMax += 16;
+				T *newArray = (T *)realloc(fArray,fMax * sizeof(T));
+				if (newArray == NULL)
+					return B_NO_MEMORY;
+
+				fArray = newArray;
+			}
+			fArray[fUsed++] = value;
+			return B_OK;
+		}
+		
+		bool Pop(T *value)
+		{
+			if (fUsed == 0)
+				return false;
+
+			*value = fArray[--fUsed];
+			return true;
+		}
+		
+	private:
+		T		*fArray;
+		int32	fUsed;
+		int32	fMax;
+};
+
+#endif	/* STACK_H */