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/*
* TDDD86 Huffman Encoding
*
* This file declares the HuffmanNode structure that you will use in your
* Huffman encoding tree.
*
* Please do not modify this provided file. Your turned-in files should work
* with an unmodified version of all provided code files.
*/
#ifndef _huffmannode_h
#define _huffmannode_h
#include <cstddef>
#include <iomanip>
#include <iostream>
#include <sstream>
#include <string>
#include "bitstream.h"
using namespace std;
/* Type: HuffmanNode
* A node inside a Huffman encoding tree. Each node stores four
* values - the character stored here (or NOT_A_CHAR if the value
* is not a character), pointers to the 0 and 1 subtrees, and the
* character count (weight) of the tree.
*/
struct HuffmanNode {
int character; // character being represented by this node
int count; // number of occurrences of that character
HuffmanNode* zero; // 0 (left) subtree (nullptr if empty)
HuffmanNode* one; // 1 (right) subtree (nullptr if empty)
/*
* Constructs a new node to store the given character and its count,
* along with the given child pointers.
*/
HuffmanNode(int character = NOT_A_CHAR, int count = 0,
HuffmanNode* zero = nullptr, HuffmanNode* one = nullptr);
/*
* Returns true if this node is a leaf (has NULL children).
*/
bool isLeaf() const;
/*
* Returns a string representation of this node for debugging.
*/
string toString() const;
/*
* Returns false if count of this node is strictly less than that of rhs,
* true otherwise.
*/
bool operator <(const HuffmanNode &rhs) const;
};
/*
* Prints an indented horizontal view of the tree of HuffmanNodes with the given
* node as its root.
* Can optionally show the memory addresses of each node for debugging.
*/
void printSideways(HuffmanNode* node, bool showAddresses = false, string indent = "");
/*
* Stream insertion operator so that a HuffmanNode can be printed for debugging.
*/
ostream& operator <<(ostream& out, const HuffmanNode& node);
#endif
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