int main(int argc, const char * argv[])
{
//first, we create the linked list header
node *root = malloc(sizeof(node));
node *end = malloc(sizeof(node));
root->next = end;
end->prev = root;
end->next = NULL;
node *current_node = root;
int index;
int list_size = 100;
//then make linked list of 350
//this will be our usable coefficient buffer
for (index = 0; index<list_size; index++){
int random_number = arc4random() % 150;
random_number = (random_number%2)? random_number*-1: random_number;
node *new_node = malloc(sizeof(node));
new_node->coeff_struct.coefficient = random_number;
add_to_linked_list(new_node, current_node);
current_node = current_node->next;
}
printf("\n");
printf("loop coefficients are: ");
//print_linked_list(root);
printf("\n");
char *message = "Hello";/* that whirl me I know not whither\nYour schemes, politics, fail, lines give way, substances mock and elude me,\nOnly the theme I sing, the great and strong-possess'd soul, eludes not,\nOne's-self must never give way--that is the final substance--that\nout of all is sure,\nOut of politics, triumphs, battles, life, what at last finally remains?\nWhen shows break up what but One's-Self is sure?";*/
embedMessageIntoCoefficients(message, root, list_size);
printf("\n\nour stego coefficients: \n");
print_linked_list(root);
printf("\n");
int message_size = (int)strlen(message)*8; //getting size of message in bits
char *extractedMessage = malloc(sizeof(char) *message_size);
extractMessageFromCoefficients(root, list_size, message_size, extractedMessage);
return 0;
}
static void embed(JBLOCKARRAY *coef_buffers, const char *embedMessage, node *root, size_t root_len)
{
{
//going along random walk as produced by the CPRNG, embed/extract message into coefficients using binary hamming matrix code
embedMessageIntoCoefficients(embedMessage, root, root_len);
//then go back and update JPEG's coefficients with the changed coefficients accordingly, using the indices data stored in the coefficient struct
printf("changing coefficients\n");
node *current_node = root->next;
while (current_node != NULL) {
JCOEF coefficient = current_node->coeff_struct.coefficient;
coef_buffers[0][current_node->coeff_struct.row_index][current_node->coeff_struct.column_index][current_node->coeff_struct.block_index] = coefficient;
current_node = current_node->next;
}
printf("done embedding\n");
}
}
