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/* steganalysis.word-gaps.c - Letter gap steganalysis
*
* This program is part of Crank, a cryptanalysis tool
* Copyright (C) 2000 Matthew Russell
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License (LICENSE) for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include "crank-interface.h"
/* Global data */
#define MODE_LETTER_IN_WORD 1 /* nth letter in a word */
#define MODE_LETTER_IN_STRING 2 /* nth letter in a string */
#define MODE_WORD_IN_TEXT 3 /* nth word in the text */
static int nth_letter = 1;
static int mode = MODE_LETTER_IN_WORD;
/* Function declares */
void cb_spinbox_changed (GtkEditable *editable, gpointer user_data);
void cb_change_mode(GtkToggleButton *togglebutton, gpointer user_data);
/* Plugin Interface */
/* ---------------- */
const char name[] = "steganalysis.word-gaps";
const char version[] = VERSION;
const char author[] = "Matthew Russell";
const char description[] = "Displays letters and words selected at intervals, either within words or within strings, to break hidden messages.";
const int interface_version = 1;
const int plugin_type = PLUGIN_MODE;
const char menu_string[] = "/Text/Word Gaps";
int boot(void) {
return PLUGIN_BOOT_OK;
}
void init_plugin(void) {;}
void deactivate_plugin(void) {;}
GtkWidget *make_widget(char *text) {
GtkWidget *hbox;
GtkObject *adjustment;
GtkWidget *spinbox;
GtkWidget *label;
GSList *group;
GtkWidget *button_letter_word, *button_letter_string, *button_word_text;
hbox = gtk_hbox_new(FALSE, 0);
label = gtk_label_new("Interval:");
gtk_widget_show(label);
gtk_box_pack_start(GTK_BOX(hbox), label, FALSE, FALSE, 0);
adjustment = gtk_adjustment_new((float) nth_letter, 1.0, 40.0, 1.0, 1.0, 0.0);
spinbox = gtk_spin_button_new(GTK_ADJUSTMENT(adjustment), 0.0, 0);
gtk_signal_connect(GTK_OBJECT(spinbox), "changed", GTK_SIGNAL_FUNC(cb_spinbox_changed), NULL);
gtk_widget_show(spinbox);
gtk_box_pack_start(GTK_BOX(hbox), spinbox, FALSE, FALSE, 0);
button_letter_word = gtk_radio_button_new_with_label(NULL, "Letter position within each word");
group = gtk_radio_button_group(GTK_RADIO_BUTTON(button_letter_word));
gtk_signal_connect(GTK_OBJECT(button_letter_word), "toggled", GTK_SIGNAL_FUNC(cb_change_mode), GINT_TO_POINTER(MODE_LETTER_IN_WORD));
gtk_widget_show(button_letter_word);
gtk_box_pack_start(GTK_BOX(hbox), button_letter_word, FALSE, FALSE, 0);
button_letter_string = gtk_radio_button_new_with_label(group, "Letter position within entire text");
gtk_signal_connect(GTK_OBJECT(button_letter_string), "toggled", GTK_SIGNAL_FUNC(cb_change_mode), GINT_TO_POINTER(MODE_LETTER_IN_STRING));
gtk_widget_show(button_letter_string);
gtk_box_pack_start(GTK_BOX(hbox), button_letter_string, FALSE, FALSE, 0);
group = gtk_radio_button_group(GTK_RADIO_BUTTON(button_letter_string));
button_word_text = gtk_radio_button_new_with_label(group, "Word position within entire text");
gtk_signal_connect(GTK_OBJECT(button_word_text), "toggled", GTK_SIGNAL_FUNC(cb_change_mode), GINT_TO_POINTER(MODE_WORD_IN_TEXT));
gtk_widget_show(button_word_text);
gtk_box_pack_start(GTK_BOX(hbox), button_word_text, FALSE, FALSE, 0);
if (mode == MODE_LETTER_IN_WORD)
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON(button_letter_word), TRUE);
else if (mode == MODE_LETTER_IN_STRING)
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON(button_letter_string), TRUE);
else if (mode == MODE_WORD_IN_TEXT)
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button_word_text), TRUE);
return hbox;
}
char *transform(char *text) {
char *newtext, c;
int word_pos = 0, in_word = FALSE, i, position = 0, length = strlen(text);
newtext = malloc((sizeof(char) * (length + 1)));
for (i = 0; i < length; i++) {
c = text[i];
if (mode == MODE_LETTER_IN_WORD) {
if (!isspace(c)) {
word_pos++;
} else {
word_pos = 0;
}
if (word_pos == nth_letter) {
newtext[position++] = c;
}
} else if (mode == MODE_LETTER_IN_STRING) {
if (nth_letter && !(i % nth_letter)) {
newtext[position++] = c;
}
} else if (mode == MODE_WORD_IN_TEXT) {
if (isspace(c)) {
newtext[position++] = c;
in_word = FALSE;
} else {
/* Check to see if this is the start of a new word */
if (!in_word) {
word_pos++;
}
if (nth_letter && !((word_pos - 1) % nth_letter))
newtext[position++] = c;
in_word = TRUE;
}
}
}
newtext[position] = '\0';
return newtext;
}
void reset(void) {
;
}
/* Plugin implementation */
/* --------------------- */
/* Callbacks */
/* --------- */
void cb_spinbox_changed (GtkEditable *editable, gpointer user_data) {
nth_letter = gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(editable));
display_text();
}
void cb_change_mode(GtkToggleButton *togglebutton, gpointer user_data) {
if (gtk_toggle_button_get_active(togglebutton)) {
mode = GPOINTER_TO_INT(user_data);
display_text();
}
}
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