beginnings of a B-tree, currently insertion has been implemented and test

git-svn-id: https://svn.musicpd.org/mpd/trunk@4487 09075e82-0dd4-0310-85a5-a0d7c8717e4f

1 files changed, 36 insertions, 0 deletions

diff --git a/src/tree.h b/src/tree.h
new file mode 100644
index 000000000..737f914d2
--- /dev/null
+++ b/src/tree.h
@@ -0,0 +1,36 @@
+#define CHILDREN_PER_NODE 3
+#define DATA_PER_NODE 2
+
+typedef struct _TreeNode
+{
+	void * data[DATA_PER_NODE];
+	struct _TreeNode * parent;
+	struct _TreeNode * children[CHILDREN_PER_NODE];
+	unsigned dataCount;
+} TreeNode;
+
+typedef int (*TreeCompareDataFunction)(void * data1, void * data2);
+typedef void (*TreeFreeDataFunction)(void * data);
+
+typedef struct _Tree
+{
+	TreeCompareDataFunction compareData;
+	TreeFreeDataFunction freeData;
+	TreeNode * rootNode;
+} Tree;
+
+typedef struct _TreeIterator
+{
+	Tree * tree;
+	TreeNode * node;
+	unsigned which;
+} TreeIterator;
+
+Tree * MakeTree(TreeCompareDataFunction compareFunc, 
+		TreeFreeDataFunction freeData);
+
+void SetIteratorToBegin(TreeIterator * iter, Tree * tree);
+
+int InsertIntoTree(Tree * tree, void * data);
+
+void DeleteFromTree(Tree * tree, void * data);