From 7ad533cca5136ab94de00078ff7b95791b3d7671 Mon Sep 17 00:00:00 2001
From: Warren Dukes <warren.dukes@gmail.com>
Date: Thu, 3 Aug 2006 02:42:27 +0000
Subject: [PATCH] remove tree.[ch] from trunk, it will be added back once the
 mpd-tree branch is merged back into trunk

git-svn-id: https://svn.musicpd.org/mpd/trunk@4535 09075e82-0dd4-0310-85a5-a0d7c8717e4f
---
 src/tree.c | 673 -----------------------------------------------------
 src/tree.h |  49 ----
 2 files changed, 722 deletions(-)
 delete mode 100644 src/tree.c
 delete mode 100644 src/tree.h

diff --git a/src/tree.c b/src/tree.c
deleted file mode 100644
index f5a804a92..000000000
--- a/src/tree.c
+++ /dev/null
@@ -1,673 +0,0 @@
-/* the Music Player Daemon (MPD)
- * (c)2006 by Warren Dukes (warren.dukes@gmail.com)
- * This project's homepage is: http://www.musicpd.org
- *
- * 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
- */
-
-#include "tree.h"
-
-#include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-
-#ifndef CHILDREN_PER_NODE
-#define CHILDREN_PER_NODE 3
-#endif
-
-#define DATA_PER_NODE (CHILDREN_PER_NODE-1)
-
-#if CHILDREN_PER_NODE > 7
-#define USE_BINARY_SEARCH 1
-#endif
-
-
-/************************* DATA STRUCTURES **********************************/
-
-struct _TreeNode
-{
-	void * data[DATA_PER_NODE];
-	struct _TreeNode * parent;
-	short parentPos;
-	struct _TreeNode * children[CHILDREN_PER_NODE];
-	short dataCount;
-};
-
-struct _Tree
-{
-	TreeCompareDataFunction compareData;
-	TreeFreeDataFunction freeData;
-	TreeNode * rootNode;
-};
-
-/************************* STATIC METHODS ***********************************/
-
-static
-TreeNode *
-_MakeNode()
-{
-	TreeNode * ret = malloc(sizeof(TreeNode));
-	memset(ret, 0, sizeof(TreeNode));
-	return ret;
-}
-
-static
-int
-_FindPosition(Tree * tree, TreeNode * node, void * data, int * pos)
-{
-#ifdef USE_BINARY_SEARCH
-	int low = 0;
-	int high = node->dataCount;
-	int cmp = -1;
-
-	while (high > low)
-	{
-		int cur = (high + low) >> 1;
-		cmp = tree->compareData(data, node->data[cur]);
-		if (cmp > 0)
-		{
-			low = cur+1;
-		}
-		else if (cmp < 0)
-		{
-			high = cur;
-		}
-		else
-		{
-			low = cur;
-			break;
-		}
-	}
-
-	*pos = low;
-	return (cmp == 0);
-#else
-	int i = 0;
-	int cmp = -1;
-	for (; 
-	     i < node->dataCount &&
-	     (cmp = tree->compareData(data, node->data[i])) > 0;
-	     i++);
-	*pos = i;
-	return (cmp == 0);
-#endif
-}
-
-static
-int
-_Find(TreeIterator * iter, void * data)
-{
-	while (1)
-	{
-		if (_FindPosition(iter->tree, iter->node, data, &iter->which))
-		{
-			return 1;
-		}
-
-		if (iter->node->children[iter->which])
-		{
-			iter->node = iter->node->children[iter->which];
-		}
-		else
-		{
-			return 0;
-		}
-	}
-}
-
-static void _SetTreeIteratorToRoot(TreeIterator * iter, Tree * tree)
-{
-	iter->tree = tree;
-	iter->node = tree->rootNode;
-	iter->which = 0;
-}
-
-static
-TreeNode *
-_SplitNode(TreeNode * node)
-{
-	assert(node->dataCount == DATA_PER_NODE);
-
-	TreeNode * newNode = _MakeNode();
-
-	int i = DATA_PER_NODE/2;
-	int j = 0;
-	for (; i < DATA_PER_NODE; i++, j++)
-	{
-		newNode->data[j] = node->data[i];
-		newNode->children[j+1] = node->children[i+1];
-		if (newNode->children[j+1])
-		{
-			newNode->children[j+1]->parent = newNode;
-			newNode->children[j+1]->parentPos = j+1;
-		}
-		node->data[i] = NULL;
-		node->children[i+1] = NULL;
-	}
-	newNode->dataCount = (DATA_PER_NODE-DATA_PER_NODE/2);
-	node->dataCount -= (DATA_PER_NODE-DATA_PER_NODE/2);
-
-	return newNode;
-}
-
-static
-void
-_InsertNodeAndData(Tree * tree, 
-		   TreeNode * node,
-		   int pos,
-		   TreeNode * newNode,
-		   void * data)
-{
-	assert(node->dataCount < DATA_PER_NODE);
-#ifdef TREE_DEBUG
-	assert(!newNode || tree->compareData(data, newNode->data[0]) < 0);
-#endif
-
-	int j = node->dataCount;
-	for (; j > pos; j--)
-	{
-		node->data[j] = node->data[j-1];
-		node->children[j+1] = node->children[j];
-		if (node->children[j+1])
-		{
-			node->children[j+1]->parentPos = j+1;
-		}
-	}
-
-#ifdef TREE_DEBUG
-	assert(!node->children[pos] ||
-	       tree->compareData(data, node->children[pos]->data[0]) > 0);
-#endif
-
-	node->data[pos] = data;
-	node->dataCount++;
-
-	node->children[pos+1] = newNode;
-	if (newNode)
-	{
-		newNode->parent = node;
-		newNode->parentPos = pos+1;
-	}
-}
-
-static
-void *
-_AddDataToSplitNodes(Tree * tree,
-		     TreeNode * lessNode, 
-		     TreeNode * moreNode,
-		     int pos,
-		     TreeNode * newNode,
-		     void * data)
-{
-#ifdef TREE_DEBUG
-	assert(newNode == NULL ||
-	       tree->compareData(data, newNode->data[0]) < 0);
-#endif
-	assert(moreNode->children[0] == NULL);
-
-	void * retData;
-
-	if (pos <= lessNode->dataCount)
-	{
-		_InsertNodeAndData(tree, lessNode, pos, newNode, data);
-		lessNode->dataCount--;
-		retData = lessNode->data[lessNode->dataCount];
-		lessNode->data[lessNode->dataCount] = NULL;
-		moreNode->children[0] = 
-			lessNode->children[lessNode->dataCount+1];
-		if (moreNode->children[0])
-		{
-			moreNode->children[0]->parent = moreNode;
-			moreNode->children[0]->parentPos = 0;
-		}
-		lessNode->children[lessNode->dataCount+1] = NULL;
-	}
-	else
-	{
-		pos -= lessNode->dataCount;
-		retData = moreNode->data[0];
-		assert(!moreNode->children[0]);
-		assert(!moreNode->data[moreNode->dataCount]);
-
-		int j = 0;
-		for (; j < pos; j++)
-		{
-			moreNode->data[j] = moreNode->data[j+1];
-			moreNode->children[j] = moreNode->children[j+1];
-			if (moreNode->children[j])
-			{
-				moreNode->children[j]->parentPos = j;
-			}
-		}
-
-		assert(!moreNode->children[pos-1] ||
-		       tree->compareData(data,
-			       		 moreNode->children[pos-1]->data[0]) > 0);
-
-		moreNode->data[pos-1] = data;
-		moreNode->children[pos] = newNode;
-		if (newNode)
-		{
-			newNode->parent = moreNode;
-			newNode->parentPos = pos;
-		}
-	}
-
-	return retData;
-}
-
-static
-void
-_InsertAt(TreeIterator * iter, void * data)
-{
-	TreeNode * node = iter->node;
-	TreeNode * insertNode = NULL;
-	int pos = iter->which;
-	
-	while (node != NULL)
-	{
-#ifdef TREE_DEBUG
-		assert((pos == node->dataCount ||
-		       iter->tree->compareData(data, node->data[pos]) < 0));
-#endif
-
-		// see if there's any NULL data in the current node
-		if (node->dataCount == DATA_PER_NODE)
-		{
-			// no open data slots, split this node!
-			TreeNode * newNode = _SplitNode(node);
-
-			// insert data in split nodes
-			data = _AddDataToSplitNodes(iter->tree,
-						    node, 
-						    newNode,
-						    pos,
-						    insertNode,
-						    data);
-
-			if (node->parent == NULL)
-			{
-				assert(node == iter->tree->rootNode);
-				iter->tree->rootNode = _MakeNode();
-				iter->tree->rootNode->children[0] = node;
-				node->parent = iter->tree->rootNode;
-				node->parentPos = 0;
-				iter->tree->rootNode->children[1] = newNode;
-				newNode->parent = iter->tree->rootNode;
-				newNode->parentPos = 1;
-				iter->tree->rootNode->data[0] = data;
-				iter->tree->rootNode->dataCount = 1;
-				return;
-			}
-
-			pos = node->parentPos;
-			node = node->parent;
-			insertNode = newNode;
-		}
-		else
-		{
-			// insert the data and newNode
-			_InsertNodeAndData(iter->tree, 
-					   node,
-					   pos,
-					   insertNode,
-					   data);
-			return;
-		}
-	}
-}
-
-static
-void
-_MergeNodes(TreeNode * lessNode, TreeNode * moreNode)
-{
-	int i = 0;
-	int j = lessNode->dataCount;
-
-	assert((lessNode->dataCount + moreNode->dataCount) <= DATA_PER_NODE);
-	assert(lessNode->children[j] == NULL);
-
-	for(; i < moreNode->dataCount; i++,j++)
-	{
-		assert(!lessNode->children[j]);
-		assert(!lessNode->data[j]);
-		lessNode->data[j] = moreNode->data[i];
-		lessNode->children[j] = moreNode->children[i];
-		if (lessNode->children[j])
-		{
-			lessNode->children[j]->parent = lessNode;
-			lessNode->children[j]->parentPos = j;
-		}
-	}
-	lessNode->children[j] = moreNode->children[i];
-	if (lessNode->children[j])
-	{
-		lessNode->children[j]->parent = lessNode;
-		lessNode->children[j]->parentPos = j;
-	}
-	lessNode->dataCount += i;
-
-	free(moreNode);
-}
-
-void
-_DeleteAt(TreeIterator * iter)
-{
-	TreeNode * node = iter->node;
-	int pos = iter->which;
-	void ** data = &(node->data[pos]);
-	void * dataToFree = *data;
-
-	{
-		// find the least greater than data to fill the whole!
-		if (node->children[pos+1])
-		{
-			TreeNode * child = node->children[++pos];
-			while (child->children[0])
-			{
-				pos = 0;
-				child = child->children[0];
-			}
-
-			*data = child->data[0];
-			data = &(child->data[0]);
-			node = child;
-		}
-		// or the greatest lesser than data to fill the whole!
-		else if (node->children[pos])
-		{
-			TreeNode * child = node->children[pos];
-			while (child->children[child->dataCount])
-			{
-				pos = child->dataCount;
-				child = child->children[child->dataCount];
-			}
-
-			*data = child->data[child->dataCount-1];
-			data = &(child->data[child->dataCount-1]);
-			node = child;
-		}
-		else
-		{
-			pos = node->parentPos;
-		}
-	}
-
-	// move data nodes over, we're at a leaf node, so we can ignore
-	// children
-	int i = data - node->data;;
-	for (; i < node->dataCount-1; i++)
-	{
-		node->data[i] = node->data[i+1];
-	}
-	node->data[--node->dataCount] = NULL;
-
-	// merge the nodes from the bottom up which have too few data
-	while (node->dataCount < (DATA_PER_NODE/2))
-	{
-		// if we're not the root
-		if (node->parent)
-		{
-			TreeNode ** child = &(node->parent->children[pos]);
-			assert(node->parent->children[pos] == node);
-
-			// check siblings for extra data
-			if (pos < node->parent->dataCount &&
-			    (*(child+1))->dataCount > (DATA_PER_NODE/2))
-			{
-				child++;
-				node->data[node->dataCount++] = 
-					node->parent->data[pos];
-				node->children[node->dataCount] =
-					(*child)->children[0];
-				if (node->children[node->dataCount])
-				{
-					node->children[node->dataCount]->
-						parent = node;
-					node->children[node->dataCount]->
-						parentPos = node->dataCount;
-				}
-				node->parent->data[pos] =
-					(*child)->data[0];
-				int i = 0;
-				for(; i < (*child)->dataCount-1; i++)
-				{
-					(*child)->data[i] = (*child)->data[i+1];
-					(*child)->children[i] =
-						(*child)->children[i+1];
-					if ((*child)->children[i])
-					{
-						(*child)->children[i]->
-							parentPos = i;
-					}
-				}
-				(*child)->children[i] = (*child)->children[i+1];
-				if ((*child)->children[i])
-				{
-					(*child)->children[i]->parentPos = i;
-				}
-				(*child)->children[i+1] =NULL;
-				(*child)->data[i] = NULL;
-				(*child)->dataCount--;
-			}
-			else if (pos > 0 &&
-				 (*(child-1))->dataCount>(DATA_PER_NODE/2))
-			{
-				child--;
-				int i = node->dataCount++;
-				for(; i > 0; i--)
-				{
-					node->data[i] = node->data[i-1];
-					node->children[i+1] = node->children[i];
-					if (node->children[i+1])
-					{
-						node->children[i+1]->parentPos =
-							i+1;
-					}
-				}
-				node->children[1] = node->children[0];
-				if (node->children[1])
-				{
-					node->children[1]->parentPos = 1;
-				}
-				node->data[0] = node->parent->data[pos-1];
-				node->children[0] = 
-					(*child)->children[(*child)->dataCount];
-				if (node->children[0])
-				{
-					node->children[0]->parent = node;
-					node->children[0]->parentPos = 0;
-				}
-				node->parent->data[pos-1] = 
-					(*child)->data[(*child)->dataCount-1];
-				(*child)->children[(*child)->dataCount--] =
-					NULL;
-				(*child)->data[(*child)->dataCount] = NULL;
-			}
-			// merge with one of our siblings
-			else
-			{
-				if (pos < node->parent->dataCount)
-				{
-					child++;
-					assert(*child);
-
-					node->data[node->dataCount++] =
-						node->parent->data[pos];
-
-					_MergeNodes(node, *child);
-				}
-				else
-				{
-					assert(pos > 0);
-					child--;
-					assert(*child);
-					pos--;
-
-					(*child)->data[(*child)->dataCount++] = 
-						node->parent->data[pos];
-
-					_MergeNodes(*child, node);
-					node = *child;
-				}
-
-				int i = pos;
-				for(; i < node->parent->dataCount-1; i++)
-				{
-					node->parent->data[i] =
-						node->parent->data[i+1];
-					node->parent->children[i+1] =
-						node->parent->children[i+2];
-					if (node->parent->children[i+1])
-					{
-						node->parent->children[i+1]->
-							parentPos = i+1;
-					}
-				}
-				node->parent->data[i] = NULL;
-				node->parent->children[i+1] = NULL;
-				node->parent->dataCount--;
-
-				node = node->parent;
-				pos = node->parentPos;
-			}
-		}
-		// this is a root node
-		else 
-		{
-			if (node->dataCount == 0)
-			{
-				if (node->children[0])
-				{
-					node->children[0]->parent = NULL;
-					node->children[0]->parentPos = 0;
-				}
-
-				iter->tree->rootNode = node->children[0];
-
-				free(node);
-			}
-
-			break;
-		}
-	}
-
-	if (iter->tree->freeData)
-	{
-		iter->tree->freeData(dataToFree);
-	}
-}
-
-/************************* PUBLIC METHODS ***********************************/
-
-Tree *
-MakeTree(TreeCompareDataFunction compareData, TreeFreeDataFunction freeData)
-{
-	Tree * ret = malloc(sizeof(Tree));
-	ret->compareData = compareData;
-	ret->freeData = freeData;
-	ret->rootNode = _MakeNode();
-	return ret;
-}
-
-void SetTreeIteratorToBegin(TreeIterator * iter, Tree * tree)
-{
-	_SetTreeIteratorToRoot(iter, tree);
-	IncrementTreeIterator(iter);
-}
-
-int IsTreeIteratorAtEnd(const TreeIterator * iter)
-{
-	return (iter->node == NULL);
-}
-
-void IncrementTreeIterator(TreeIterator * iter)
-{
-	while(iter->node)
-	{
-		if (iter->node->children[iter->which])
-		{
-			iter->node = iter->node->children[iter->which];
-			iter->which = 0;
-		}
-		else
-		{
-			iter->which++;
-		}
-
-		while (iter->node && iter->which > iter->node->dataCount)
-		{
-			TreeNode * childNode = iter->node;
-			iter->node = childNode->parent;
-			if (iter->node)
-			{
-				for (iter->which = 0;
-				     childNode != 
-				     iter->node->children[iter->which];
-				     iter->which++)
-				{
-					assert(iter->which <= 
-					       iter->node->dataCount);
-				}
-				iter->which++;
-			}
-		}
-
-		if (iter->node &&
-		    iter->which > 0 && iter->which <= iter->node->dataCount)
-		{
-			return;
-		}
-	}
-}
-
-void *
-GetDataFromTreeIterator(TreeIterator * iter)
-{
-	assert(iter->node && 
-	       iter->which > 0 && 
-	       iter->which <= iter->node->dataCount);
-	return iter->node->data[iter->which-1];
-}
-
-int
-InsertIntoTree(Tree * tree, void * data)
-{
-	TreeIterator iter;
-	_SetTreeIteratorToRoot(&iter, tree);
-
-	if (_Find(&iter, data))
-	{
-		return 0;
-	}
-
-	_InsertAt(&iter, data);
-
-	return 1;
-}
-
-int
-DeleteFromTree(Tree * tree, void * data)
-{
-	TreeIterator iter;
-	_SetTreeIteratorToRoot(&iter, tree);
-
-	if (_Find(&iter, data))
-	{
-		_DeleteAt(&iter);
-		return 1;
-	}
-
-	return 0;
-}
diff --git a/src/tree.h b/src/tree.h
deleted file mode 100644
index 6f53a9145..000000000
--- a/src/tree.h
+++ /dev/null
@@ -1,49 +0,0 @@
-/* the Music Player Daemon (MPD)
- * (c)2006 by Warren Dukes (warren.dukes@gmail.com)
- * This project's homepage is: http://www.musicpd.org
- *
- * 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
- */
-
-#ifndef TREE_H
-#define TREE_H
-
-typedef struct _Tree Tree;
-typedef struct _TreeNode TreeNode;
-typedef struct _TreeIterator TreeIterator;
-
-struct _TreeIterator
-{
-	Tree * tree;
-	TreeNode * node;
-	int which;
-};
-
-typedef int (*TreeCompareDataFunction)(const void * data1, const void * data2);
-typedef void (*TreeFreeDataFunction)(void * data);
-
-Tree * MakeTree(TreeCompareDataFunction compareFunc, 
-		TreeFreeDataFunction freeData);
-
-void SetTreeIteratorToBegin(TreeIterator * iter, Tree * tree);
-int IsTreeIteratorAtEnd(const TreeIterator * iter);
-void IncrementTreeIterator(TreeIterator * iter);
-
-void * GetDataFromTreeIterator(TreeIterator * iter);
-
-int InsertIntoTree(Tree * tree, void * data);
-
-int DeleteFromTree(Tree * tree, void * data);
-
-#endif