private static void FillEncodeTable(HuffmanNode node, BitsWithLength[] encodeSubstitutionTable, byte bitvector = 0, byte depth = 0)
{
if (node.LeafLabel != null)
{
encodeSubstitutionTable[node.LeafLabel.Value] = new BitsWithLength(bitvector, depth);
}
else
{
if (node.Left != null)
{
FillEncodeTable(node.Left, encodeSubstitutionTable, (byte)((bitvector << 1) + 1), (byte)(depth + 1));
FillEncodeTable(node.Right, encodeSubstitutionTable, (byte)((bitvector << 1) + 0), (byte)(depth + 1));
}
}
}
public void HuffmanDepthTest()
{
HuffmanNode node1 = new HuffmanNode(1, 1);
HuffmanNode node2 = new HuffmanNode(2, 1);
HuffmanNode node3 = new HuffmanNode(5, 5);
HuffmanNode node4 = new HuffmanNode(7, 7);
HuffmanNode node5 = new HuffmanNode(10, 10);
HuffmanNode node6 = new HuffmanNode(14, 14);
List <HuffmanNode> testList = new List <HuffmanNode> {
node1, node5, node3, node6, node2, node4
};
HuffmanEncoder encoder = new HuffmanEncoder();
Dictionary <byte, int> testDict = new Dictionary <byte, int>();
//testDict = encoder.EncodeToPackageMerge(testList, 4);
}
//recurses through the entire tree and stacks up the respective code, then adds the respective symbol and code to the HuffmanTable when reaching a leave
public void ConvertTreeToTable(List <bool> code, HuffmanNode node) //
{
if (node == null)
{
return;
}
if (node.isLeaf == true)
{
huffmanTable.Add(node.symbol, code);
return;
}
code.Add(false);
ConvertTreeToTable(code, node.left);
code.RemoveAt(code.Count - 1);
code.Add(true);
ConvertTreeToTable(code, node.right);
}
private static void FillEncodeTable(HuffmanNode node, BitsWithLength[] encodeSubstitutionTable, int bitvector = 0, int depth = 0)
{
if (node.LeafLabel != null)
{
encodeSubstitutionTable[node.LeafLabel.Value] = new BitsWithLength {
Bits = bitvector, BitsCount = depth
}
}
;
else
{
if (node.Left != null)
{
FillEncodeTable(node.Left, encodeSubstitutionTable, (bitvector << 1) + 1, depth + 1);
FillEncodeTable(node.Right, encodeSubstitutionTable, (bitvector << 1) + 0, depth + 1);
}
}
}
private static List <HuffmanNode> GetNodes(int[] frequences)
{
var nodesCount = frequences.Count(f => f > 0);
var nodes = new HuffmanNode[nodesCount];
var index = 0;
for (var i = 0; i < frequences.Length; i++)
{
if (frequences[i] > 0)
{
nodes[index++] = new HuffmanNode {
Frequency = frequences[i], LeafLabel = (byte)i
}
}
;
}
return(nodes.Distinct().OrderBy(n => n.Frequency).ToList());
}
//3b
//builds the HuffmanTree so that the left child of each node is a leaf with the highest remaining frequency (growing to the right hand side)
//NOITCE: the lowest non-leaf node consists of two leafs with the lowest-frequency-leaf (total) as the right child
public HuffmanNode ReorderTreeToRightSide(HuffmanNode root)
{
depthList = new List <List <HuffmanNode> >();
maximumDepth = 0;
GoThroughTree(root);
for (int i = maximumDepth; i > 0; i--)
{
depthList[i].Sort((nodeOne, nodeTwo) => nodeOne.depth.CompareTo(nodeTwo.depth));
while (depthList[i].Count > 0)
{
HuffmanNode newNode = new HuffmanNode(depthList[i][depthList[i].Count - 2], depthList[i][depthList[i].Count - 1]);
newNode.depth = newNode.right.depth + 1;
depthList[i - 1].Add(newNode);
depthList[i].RemoveAt(depthList[i].Count - 1);
depthList[i].RemoveAt(depthList[i].Count - 1);
}
}
return(depthList[0][0]);
}
//3d
public void EncodeToPackageMerge(List <HuffmanNode> inputlist, int depth)
{
//Sortierung nach Frequenz
inputlist.Sort((nodeOne, nodeTwo) => nodeOne.frequency.CompareTo(nodeTwo.frequency));
List <HuffmanNode> nodelist = new List <HuffmanNode>(inputlist);
//Durchlaufe die Liste entsprechend der Tiefe
for (int i = 2; i <= depth; i++)
{
//Bilde Paare und erstelle einen neuen Knoten, alle erstellten Knoten werden in tempList gespeichert
List <HuffmanNode> tempList = new List <HuffmanNode>();
for (int c = 1; c < nodelist.Count; c += 2)
{
HuffmanNode mergedNode = new HuffmanNode(nodelist[c - 1].frequency + nodelist[c].frequency, nodelist[c - 1], nodelist[c]);
tempList.Add(mergedNode);
}
nodelist.Clear(); //lösche alte liste
nodelist.AddRange(inputlist); // setzte liste auf die Anfangswerte
nodelist.AddRange(tempList); // füge erzeugte knoten der liste hinzu
tempList.Clear(); //Lösche alte Knoten für einen neuen Schleifendurchlauf
//Sortiere neue Liste nach frequency
nodelist.Sort((nodeOne, nodeTwo) => nodeOne.frequency.CompareTo(nodeTwo.frequency));
}
//---------------Liste mit Knoten wurde erstellt---------------------------------------------
var valueTable = new Dictionary <byte, int>();
for (int i = 0; i < inputlist.Count; i++)
{
valueTable[inputlist[i].symbol] = inputlist[i].depth;
}
//---------------Liste auf 2n-2 Elemente kürzen-----------------------------------------------
int cutter = inputlist.Count * 2 - 2;
if (nodelist.Count > cutter)
{
nodelist.RemoveRange(cutter, nodelist.Count - cutter);
}
//---------------Key/Value Liste für die Kodierungsgewichtung erstellt------------------------
for (int i = 0; i < nodelist.Count; i++)
{
if (nodelist[i].isDepthNode == true)
{
nodelist.Add(nodelist[i].left);
nodelist.Add(nodelist[i].right);
nodelist.Remove(nodelist[i]);
i--;
}
else
{
valueTable[nodelist[i].symbol]++;
}
}
Dictionary <Byte, int> wertOutput = new Dictionary <byte, int>();
foreach (var item in inputlist)
{
wertOutput.Add(item.symbol, item.frequency);
}
EncodeToPackageMergeList(valueTable, wertOutput);
}