/*Authur Xuntan
This sample program shows how to decode a ssreader image file
Based on xuntan's reverse engineer work.
Gif writing function is not included
*/


#include <stdio.h>
#include <math.h>
#include "gif.h"

typedef struct {
    int width;
    int height;
    unsigned char * data;
    }
myimg,*pmyimg;

int huffman1();
int huffman2();
int GetNextBit();
void MyImageDestory(pmyimg p);
pmyimg ReadMyImageHead(char * fname);
void DecodeMyImage(pmyimg img);
void ScaleMyImage(pmyimg,int neww);
void WriteGifFile(pmyimg image);
void CropMyImage(pmyimg image);
void Error(char *);

/* Global Variable*/
FILE * fimg;
unsigned int bdata;
int len=16;
int buf1[1024];
int buf2[1024];
int offset;

int main(int argc,char *argv[]){
FILE * out;
int color[16];
int i,j;
pmyimg image;
char * p,q;
char * query;
char fname[64];
char buf [64];
char buf2[16];

if(argc<2) {
    printf("usage: gifconv filename\n");
    exit(0);
    }

image=ReadMyImageHead(argv[1]);

DecodeMyImage(image);
WriteGifFile(image);
MyImageDestory(image);
}

void Error(char * msg){    
    printf("%s\n",msg);
    exit(0);
    }

void WriteGifFile(pmyimg image){
    GIFStream    *stream;
    GIFData        *cur;
    GIF89info    info;
    int i,j;
    
    stream=(GIFStream *)malloc(sizeof(GIFStream));
    if(!stream)
        Error("error in malloc gif data\n");        
    stream->width =image->width;
    stream->height=image->height;
    stream->cmapSize=16;
    stream->colorMapSize =16;
    stream->colorResolution =4;
    stream->background =0;
    stream->ASPectRatio= 0;
    stream->data =NULL;
    stream->cmapData[0][0]=255;
    stream->cmapData[0][1]=255;
    stream->cmapData[0][2]=255;
    for(i=1;i<16;i++){
        stream->cmapData[i][0]=256-i*16;
        stream->cmapData[i][1]=256-i*16;
        stream->cmapData[i][2]=256-i*16;
        }
    info.disposal    = 0;
    info.inputFlag   = 0;
    info.delayTime   = 0;
    info.transparent = -1;
    
    cur=(GIFData *)malloc(sizeof(GIFData));
    cur->type =gif_image;
    cur->info =info;
    cur->x      =0;
  &nbs