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Structs.h
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Structs.h
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//Various structs used throughout the program
/////////////////////////////////////////////////
#ifndef _Structs_h
#define _Structs_h
#include <string>
using namespace std;
#define HEADER_SIZE 20 //size (in bytes) of wlt header not including frequency table
//Holds info for the compressed file header
struct wlt_header_info
{
unsigned short hsize; //size of the wlt header
int img_size; //number of uncompressed image bytes
char steps; //number of downsample steps (either 1 or 0)
int input_bytes; //number of compressed image bytes
char h_padding; //number of padding bits at the end of the encoded image data
double scale; //the scaling value for the transformed coefficients
string frequency; //frequency table for huffman decoding
//format: "[value1] [freq1]/[value2] [freq2]/..."
//where any values (0 - 255) not listed are assumed
//to have zero frequency
};
//Just a pixel colour value
struct pixel
{
double red;
double blue;
double green;
};
//A node for the Huffman tree
struct hNode
{
int value; //the value (0 - 255) of this node if it is a
//leaf. If it is not a leaf, this will be set
//to (-1)
unsigned int freq; //the frequency that this symbol occurs (if it is a leaf)
char bit; //either 0 or 1, for generating the Huffman codewords
char is_root; //1 if this is a root node
hNode *parent, *l_child, *r_child; //pointers to connected nodes
};
#endif