priyatham/Steganography-in-C
1
0
Fork 0
mirror of https://github.com/Priyatham-sai-chand/Steganography-in-C.git synced 2026-10-05 08:51:35 -07:00
Code Issues Projects Releases Packages Wiki Activity Actions

Stable working of encoding

Browse source
This commit is contained in:
Priyatham Sai Chand 2020-08-14 21:59:32 +05:30
parent 4d73945ce9
commit 067ac3272a
2 changed files with 78 additions and 73 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

75
encode.c
View file

@ -87,26 +87,23 @@ struct PPM * encoder(struct PPM * img, char * message,unsigned int secret,int n)
for(int j = n -1; j >= 0;j--)
{
if(k > 8*mSize)break;
else
{
red->bin[7-j] = msg_bin[k];
k++;
}
}
for(int j = n -1; j >= 0;j--)
{
if(k > 8*mSize)break;
else
{
green->bin[7-j] = msg_bin[k];
k++;
}
}
@ -116,6 +113,7 @@ struct PPM * encoder(struct PPM * img, char * message,unsigned int secret,int n)
else
{
blue->bin[7-j] = msg_bin[k];
k++;
}
@ -124,25 +122,14 @@ struct PPM * encoder(struct PPM * img, char * message,unsigned int secret,int n)
p->r = bind2dec(red);
p->g = bind2dec(green);
p->b = bind2dec(blue);
//img ->p[row][column] = &p;
}
for(int s = 0; s < 8*mSize; s++)
{
printf("%d",msg_bin[s]);
}
return img;
}
@ -152,7 +139,7 @@ char * decode(struct PPM * img, unsigned int secret,int n,int mSize)
srand(secret);
int width,rando,sum = 0,row,column,i = 0,k = 0,p = 0;
int no_of_pixels = (int)ceil(mSize*8/(3*n));
int buffer[8*mSize];
char * buffer = malloc(sizeof(char) * 8 * mSize);
while(i <= no_of_pixels)
{
@ -162,7 +149,7 @@ char * decode(struct PPM * img, unsigned int secret,int n,int mSize)
row = sum / (width);
column = sum - (row * width);
printf("%d %d\n",row,column);
//get pixel
struct pixel * p = &(img->p[row][column]);
struct conv * red = dec2bind(p->r);
@ -173,6 +160,7 @@ char * decode(struct PPM * img, unsigned int secret,int n,int mSize)
{
buffer[k] =red->bin[7-j];
k++;
@ -181,6 +169,7 @@ char * decode(struct PPM * img, unsigned int secret,int n,int mSize)
{
buffer[k] =green->bin[7-j];
k++;
@ -189,6 +178,7 @@ char * decode(struct PPM * img, unsigned int secret,int n,int mSize)
{
buffer[k] =blue->bin[7-j];
k++;
@ -196,32 +186,39 @@ char * decode(struct PPM * img, unsigned int secret,int n,int mSize)
}
for(int s = 0; s < 8*mSize; s++)
{
printf("%d",buffer[s]);
}
struct conv * msg_bin[mSize];
int msg_no[mSize];
char * str = (char *)malloc(sizeof(char) * mSize);
char * str = (char *)malloc(sizeof(char) * 7);
struct conv * test;
int temp[8],temp1;
/*for(int r = 0; r < 8; r++)
int temp[8],t = 0;
int temp1[mSize];
for(int r = 0; r < mSize; r++)
{
temp[r] = buffer[r];
for(int s = 0; s < 8; s++)
{
temp[s] = buffer[t];
t++;
}
temp1[r] = bind2dectest(temp);
}
temp1 = bind2dec1(temp);
printf("%d",temp1);*/
for(int u = 0;u < 9; u++)
{
str[u] = temp1[u];
}
return "asdf";
return str;
}

76
steg.c
View file

@ -10,11 +10,11 @@ int main(int argc, char ** argv)
else
{
FILE * fin = fopen(argv[2], "r");
/* FILE * fin = fopen(argv[2], "r");
struct PPM * img = getPPM(fin);
showPPM(img);
//if(argv[1][0] == 'e')encodeFile(argc,argv);
//if(argv[1][0] == 'd')decodeFile(argc,argv);
showPPM(img);*/
if(argv[1][0] == 'e')encodeFile(argc,argv);
if(argv[1][0] == 'd')decodeFile(argc,argv);
}
@ -25,20 +25,19 @@ int main(int argc, char ** argv)
void showPPM (struct PPM * img){
//print type
printf("%s\n", img->type);
printf("%s", img->type);
//print text
int j;
struct comment * t = img->comment;
printf("%s\n", img->comment->comment);
printf("%s", img->comment->comment);
for(j = 1; j<img->cn; j++){
t = t->next;
printf("%s\n", t->comment);
printf("%s", t->comment);
}
//print general info
printf("%d\n", img->width);
printf("%d\n", img->height);
printf("%d %d\n", img->width, img->height);
printf("%d\n", img->max);
//print pixels
@ -54,14 +53,15 @@ void showPPM (struct PPM * img){
/* Utilizes the above readLine function to find the comments */
void getText(FILE * fin, struct PPM * img){
char ch = fgetc(fin);
char ch = fgetc(fin);
while(ch == '#') //lines beginning with "#" character
{
ch = fgetc(fin);
//ungetc(ch, fin);
ungetc(ch, fin);
/* //get comment
//char * line;
//get comment
//add comment to linked list
@ -69,9 +69,9 @@ void getText(FILE * fin, struct PPM * img){
{
//no previous comments
struct comment * current = img->comment;
current = (struct comment * )malloc(sizeof(struct comment));
fgets(current->comment,100,fin);
img->comment = (struct comment * )malloc(sizeof(struct comment));
fgets(img->comment->comment,100,fin);
img->cn = 1;
}
else
@ -79,15 +79,15 @@ void getText(FILE * fin, struct PPM * img){
//previous comments
int j;
struct comment * current = img->comment;
for(j=1;j<img->cn;j++)
{
current = current->next;
current->next = (struct comment *)malloc(sizeof(struct comment));
fgets(current->next->comment,100,fin);
}
current->next = (struct comment *)malloc(sizeof(struct comment));
fgets(current->next->comment,100,fin);
img->cn = img->cn + 1;
}
@ -96,7 +96,7 @@ void getText(FILE * fin, struct PPM * img){
}
//Restore to starting position
ungetc(ch, fin);*/
ungetc(ch, fin);
}
void getPixels(FILE * fin, struct PPM * img){
@ -123,10 +123,17 @@ void getPixels(FILE * fin, struct PPM * img){
/* Return PPM image file from fin */
struct PPM * getPPM(FILE * fin){
struct PPM * img = malloc(sizeof(struct PPM));
char ch;
//Type
img->type = malloc(2*sizeof(char));
img->type = "P3";
ch = fgetc(fin);
img->type = malloc(4*sizeof(char));
if( ch == 'P')
{
ungetc(ch, fin);
fgets(img->type,4,fin);
}
img->cn = 0;
getText(fin, img);
@ -157,7 +164,7 @@ void writePPM(FILE * fin, struct PPM * img, const char *fileName){
fclose(pfile);
}
void encodeFile(int argc, char ** argv){
char txt[PPM_MAXMESS];
char txt[PPM_MAXMESS],secret[PPM_MAXMESS];
int n;
FILE * fin = fopen(argv[2], "r");
if(fin == NULL){
@ -169,16 +176,16 @@ void encodeFile(int argc, char ** argv){
//get txt
printf("Message to Encode-> ");
fgets(txt, PPM_MAXMESS, stdin);
printf("Enter no. of LSBs ( 3 to 21)");
gets(txt);
printf("Enter no. of LSBs ( 3 to 21)]-> ");
scanf("%d",&n);
printf("Enter secret message -> ");
gets(secret);
printf("encoding in progress...\n");
//encode ppm
img = encoder(img, txt,1234,n);
printf("test");
showPPM(img);
//output ppm
//fputc(showPPM, outFin);
writePPM(fin, img, "modified.ppm");
@ -201,8 +208,9 @@ void decodeFile(int argc, char ** argv){
//get encoded txt
char * str = decode(img,1234,3,9);
for(int i = 0 ; i < 9;i++)printf("%c",str[i]);
//print txt
printf("%s\n", str);
//printf("%s", str);
}