netsurf/gtk/gui.c

/*
 * Copyright 2004-2010 James Bursa <bursa@users.sourceforge.net>
 * Copyright 2010 Vincent Sanders <vince@debian.org>
 * Copyright 2004-2009 John-Mark Bell <jmb@netsurf-browser.org>
 * Copyright 2009 Paul Blokus <paul_pl@users.sourceforge.net>
 * Copyright 2006-2009 Daniel Silverstone <dsilvers@netsurf-browser.org>
 * Copyright 2006-2008 Rob Kendrick <rjek@netsurf-browser.org>
 * Copyright 2008 John Tytgat <joty@netsurf-browser.org>
 * Copyright 2008 Adam Blokus <adamblokus@gmail.com>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf 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; version 2 of the License.
 *
 * NetSurf 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <curl/curl.h>
#include <gdk/gdkkeysyms.h>
#include <gtk/gtk.h>
#include <glade/glade.h>
#include <glib.h>
#include <glib/gi18n.h>

#include "content/content.h"
#include "content/fetch.h"
#include "content/fetchers/curl.h"
#include "content/fetchers/resource.h"
#include "content/hlcache.h"
#include "content/urldb.h"
#include "desktop/browser.h"
#include "desktop/cookies.h"
#include "desktop/gui.h"
#include "desktop/history_global_core.h"
#include "desktop/netsurf.h"
#include "desktop/options.h"
#include "desktop/save_pdf/pdf_plotters.h"
#include "desktop/searchweb.h"
#include "desktop/sslcert.h"
#include "desktop/textinput.h"
#include "desktop/tree.h"
#include "css/utils.h"
#include "gtk/dialogs/options.h"
#include "gtk/completion.h"
#include "gtk/cookies.h"
#include "gtk/download.h"
#include "gtk/filetype.h"
#include "gtk/gui.h"
#include "gtk/history.h"
#include "gtk/hotlist.h"
#include "gtk/throbber.h"
#include "gtk/treeview.h"
#include "gtk/window.h"
#include "gtk/options.h"
#include "gtk/schedule.h"

#include "render/box.h"
#include "render/form.h"
#include "utils/filepath.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/url.h"
#include "utils/utf8.h"
#include "utils/utils.h"

char *default_stylesheet_url;
char *quirks_stylesheet_url;
char *adblock_stylesheet_url;
char *options_file_location;
char *toolbar_indices_file_location;
char *res_dir_location;
char *print_options_file_location;
char *languages_file_location;

char *glade_netsurf_file_location;
char *glade_password_file_location;
char *glade_warning_file_location;
char *glade_login_file_location;
char *glade_ssl_file_location;
char *glade_toolbar_file_location;
char *glade_options_file_location;

static char *glade_downloads_file_location;
static char *glade_history_file_location;
static char *glade_hotlist_file_location;
static char *glade_cookies_file_location;

static GtkWindow *nsgtk_warning_window;
GtkWidget *widWarning;

static GtkWidget *select_menu;
static struct browser_window *select_menu_bw;
static struct form_control *select_menu_control;

static void nsgtk_ssl_accept(GtkButton *w, gpointer data);
static void nsgtk_ssl_reject(GtkWidget *w, gpointer data);
static gboolean nsgtk_ssl_delete_event(GtkWidget *w, GdkEvent  *event,
		gpointer data);
static void nsgtk_select_menu_clicked(GtkCheckMenuItem *checkmenuitem,
					gpointer user_data);
#ifdef WITH_PDF_EXPORT
static void nsgtk_PDF_set_pass(GtkButton *w, gpointer data);
static void nsgtk_PDF_no_pass(GtkButton *w, gpointer data);
#endif

#define THROBBER_FRAMES 9

static char **respaths; /** resource search path vector */

/** Create an array of valid paths to search for resources.
 *
 * The idea is that all the complex path computation to find resources
 * is performed here, once, rather than every time a resource is
 * searched for.
 */
static char **
nsgtk_init_resource(const char *resource_path)
{
	const gchar * const *langv;
	char **pathv; /* resource path string vector */
	char **respath; /* resource paths vector */

	pathv = filepath_path_to_strvec(resource_path);

	langv = g_get_language_names();

	respath = filepath_generate(pathv, langv);

	filepath_free_strvec(pathv);

	return respath;
}

/* This is an ugly hack to just get the new-style throbber going.
 * It, along with the PNG throbber loader, need making more generic.
 */
static bool nsgtk_throbber_init(char **respath, int framec)
{
	char **filenames;
	char targetname[PATH_MAX];
	int frame_num;
	bool ret;

	filenames = calloc(framec, sizeof(char *));
	if (filenames == NULL)
		return false;

	for (frame_num = 0; frame_num < framec; frame_num++) {
		snprintf(targetname, PATH_MAX, "throbber/throbber%d.png", frame_num);
		filenames[frame_num] = filepath_find(respath, targetname);
	}

	ret = nsgtk_throbber_initialise_from_png(frame_num, filenames);

	for (frame_num = 0; frame_num < framec; frame_num++) {
		free(filenames[frame_num]);
	}
	free(filenames);

	return ret;

}

#define NEW_GLADE_ERROR_SIZE 128

static char *
nsgtk_new_glade(char **respath, const char *name, GladeXML **pglade)
{
	GladeXML *newglade;
	char *filepath;
	char errorstr[NEW_GLADE_ERROR_SIZE];
	char resname[PATH_MAX];

	snprintf(resname, PATH_MAX, "%s.glade", name);

	filepath = filepath_find(respath, resname);
	if (filepath == NULL) {
		snprintf(errorstr, NEW_GLADE_ERROR_SIZE, 
			 "Unable to locate %s glade template file.\n", name);
		die(errorstr);
	}

	newglade = glade_xml_new(filepath, NULL, NULL);
	if (newglade == NULL) {
		snprintf(errorstr, NEW_GLADE_ERROR_SIZE, 
			 "Unable to load glade %s window definitions.\n", name);

		die(errorstr);
	}
	glade_xml_signal_autoconnect(newglade);

	LOG(("Using '%s' as %s glade template file", filepath, name));

	if (pglade != NULL) {
		*pglade = newglade;
	}

	return filepath;
}

/**
 * Load definitions from glade files.
 */
static void 
nsgtk_init_glade(char **respath)
{
	GladeXML *gladeWarning;

	glade_init();

	glade_netsurf_file_location = nsgtk_new_glade(respath, "netsurf", NULL);
	glade_password_file_location = nsgtk_new_glade(respath, "password", NULL);
	glade_login_file_location = nsgtk_new_glade(respath, "login", NULL);
	glade_ssl_file_location = nsgtk_new_glade(respath, "ssl", NULL);
	glade_toolbar_file_location = nsgtk_new_glade(respath, "toolbar", NULL);
	glade_downloads_file_location = nsgtk_new_glade(respath, "downloads", NULL);
	glade_history_file_location = nsgtk_new_glade(respath, "history", NULL);
	glade_options_file_location = nsgtk_new_glade(respath, "options", NULL);
	glade_hotlist_file_location = nsgtk_new_glade(respath, "hotlist", NULL);
	glade_cookies_file_location = nsgtk_new_glade(respath, "cookies", NULL);

	glade_warning_file_location = nsgtk_new_glade(respath, "warning", &gladeWarning);
	nsgtk_warning_window = GTK_WINDOW(glade_xml_get_widget(gladeWarning, "wndWarning"));
	widWarning = glade_xml_get_widget(gladeWarning, "labelWarning");
}

static void check_options(char **respath)
{
	char *hdir = getenv("HOME");
	char buf[PATH_MAX];

	option_core_select_menu = true;

	/* Attempt to handle nonsense status bar widths.  These may exist
	 * in people's Choices as the GTK front end used to abuse the
	 * status bar width option by using it for an absolute value in px.
	 * The GTK front end now correctly uses it as a proportion of window
	 * width.  Here we assume that a value of less than 15% is wrong
	 * and set to the default two thirds. */
	if (option_toolbar_status_width < 1500) {
		option_toolbar_status_width = 6667;
	}

	/* user options should be stored in the users home directory */
	snprintf(buf, PATH_MAX, "%s/.netsurf/Choices", hdir);      
	options_file_location = strdup(buf);

        /* VRS - I do not beleive these setting should search the
	 * resource path, they should just be set to the default
	 * values! 
	 */
	if (!option_cookie_file) {
		filepath_sfinddef(respath, buf, "Cookies", "~/.netsurf/");
		LOG(("Using '%s' as Cookies file", buf));
		option_cookie_file = strdup(buf);
	}
	if (!option_cookie_jar) {
		filepath_sfinddef(respath, buf, "Cookies", "~/.netsurf/");
		LOG(("Using '%s' as Cookie Jar file", buf));
		option_cookie_jar = strdup(buf);
	}
	if (!option_cookie_file || !option_cookie_jar)
		die("Failed initialising cookie options");

	if (!option_url_file) {
		filepath_sfinddef(respath, buf, "URLs", "~/.netsurf/");
		LOG(("Using '%s' as URL file", buf));
		option_url_file = strdup(buf);
	}

        if (!option_ca_path) {
		filepath_sfinddef(respath, buf, "certs", "/etc/ssl/");
                LOG(("Using '%s' as certificate path", buf));
                option_ca_path = strdup(buf);
        }

        if (!option_downloads_directory) {
        	LOG(("Using '%s' as download directory", hdir));
        	option_downloads_directory = hdir;
	}
	
	filepath_sfinddef(respath, buf, "icons/", "~/.netsurf/");
	LOG(("Using '%s' as Tree icons dir", buf));
	tree_set_icon_dir(strdup(buf));

	if (!option_hotlist_path) {
		filepath_sfinddef(respath, buf, "Hotlist", "~/.netsurf/");
		LOG(("Using '%s' as Hotlist file", buf));
		option_hotlist_path = strdup(buf);		
	}
	if (!option_hotlist_path)
		die("Failed initialising hotlist option");	
	

	filepath_sfinddef(respath, buf, "Print", "~/.netsurf/");
	LOG(("Using '%s' as Print Settings file", buf));
	print_options_file_location = strdup(buf);

	/* check what the font settings are, setting them to a default font
	 * if they're not set - stops Pango whinging
	 */
#define SETFONTDEFAULT(x,y) (x) = ((x) != NULL) ? (x) : strdup((y))
	SETFONTDEFAULT(option_font_sans, "Sans");
	SETFONTDEFAULT(option_font_serif, "Serif");
	SETFONTDEFAULT(option_font_mono, "Monospace");
	SETFONTDEFAULT(option_font_cursive, "Serif");
	SETFONTDEFAULT(option_font_fantasy, "Serif");

}

char* gui_get_resource_url(const char *filename)
{
	char buf[PATH_MAX];
	return path_to_url(filepath_sfind(respaths, buf, filename));
}


/**
 * Initialize GTK interface.
 */
static void gui_init(int argc, char** argv, char **respath)
{
	char buf[PATH_MAX];
	struct browser_window *bw;
	const char *addr = NETSURF_HOMEPAGE;
	char *resource_filename;

	/* check user options */
	check_options(respath);

	/* Obtain resources path location. 
	 *
	 * Uses the directory the languages file was found in,
	 * previously the location of the glade files was used,
	 * however these may be translated which breaks things
	 * relying on res_dir_location.
	 */	
	resource_filename = filepath_find(respath, "languages");
	resource_filename[strlen(resource_filename) - 9] = 0;
	res_dir_location = resource_filename;

	/* languages file */
	languages_file_location = filepath_find(respath, "languages");

	/* initialise the glade templates */
	nsgtk_init_glade(respath);

	/* set default icon if its available */
	resource_filename = filepath_find(respath, "netsurf.xpm");
	if (resource_filename != NULL) {
		gtk_window_set_default_icon_from_file(resource_filename, NULL);
		free(resource_filename);
	}

	/* Search engine sources */
	search_engines_file_location = filepath_find(respath, "SearchEngines");
	LOG(("Using '%s' as Search Engines file", search_engines_file_location));

	/* Default Icon */
	search_default_ico_location = filepath_find(respath, "default.ico");
	LOG(("Using '%s' as default search ico", search_default_ico_location));

	/* Toolbar inicies file */
	toolbar_indices_file_location = filepath_find(respath, "toolbarIndices");
	LOG(("Using '%s' as custom toolbar settings file", toolbar_indices_file_location));

        /* load throbber images */
	if (nsgtk_throbber_init(respath, THROBBER_FRAMES) == false)
		die("Unable to load throbber image.\n");

	/* Initialise completions - cannot fail */
	nsgtk_completion_init();

	filepath_sfinddef(respath, buf, "mime.types", "/etc/");
	gtk_fetch_filetype_init(buf);

	/* set up stylesheet urls */
	default_stylesheet_url = strdup("resource:gtkdefault.css");
	LOG(("Using '%s' as Default CSS URL", default_stylesheet_url));

	quirks_stylesheet_url = strdup("resource:quirks.css");
	LOG(("Using '%s' as quirks CSS URL", quirks_stylesheet_url));

	adblock_stylesheet_url = strdup("resource:adblock.css");
	LOG(("Using '%s' as AdBlock CSS URL", adblock_stylesheet_url));

	urldb_load(option_url_file);
	urldb_load_cookies(option_cookie_file);

	/* The tree view system needs to know the screen's DPI, so we
	 * find that out here, rather than when we create a first browser
	 * window.
	 */

	nscss_screen_dpi = FLTTOFIX(gdk_screen_get_resolution(
					    gdk_screen_get_default()));
	LOG(("Set CSS DPI to %f", FIXTOFLT(nscss_screen_dpi)));

	if (nsgtk_history_init(glade_history_file_location) == false)
		die("Unable to initialise history window.\n");

	if (nsgtk_download_init(glade_downloads_file_location) == false)
		die("Unable to initialise download window.\n");

	if (nsgtk_cookies_init(glade_cookies_file_location) == false)
		die("Unable to initialise cookies window.\n");

	if (nsgtk_hotlist_init(glade_hotlist_file_location) == false)
		die("Unable to initialise hotlist window.\n");

	sslcert_init(tree_content_icon_name);

        if (option_homepage_url != NULL && option_homepage_url[0] != '\0')
                addr = option_homepage_url;

	if (2 <= argc)
		addr = argv[1];

        /* Last step of initialization. Opens the main browser window. */
	bw = browser_window_create(addr, 0, 0, true, false);
}


/**
 * Check that ~/.netsurf/ exists, and if it doesn't, create it.
 */
static void nsgtk_check_homedir(void)
{
	char *hdir = getenv("HOME");
	char buf[PATH_MAX];

	if (hdir == NULL) {
		/* we really can't continue without a home directory. */
		LOG(("HOME is not set - nowhere to store state!"));
		die("NetSurf requires HOME to be set in order to run.\n");

	}

	snprintf(buf, PATH_MAX, "%s/.netsurf", hdir);
	if (access(buf, F_OK) != 0) {
		LOG(("You don't have a ~/.netsurf - creating one for you."));
		if (mkdir(buf, 0777) == -1) {
			LOG(("Unable to create %s", buf));
			die("NetSurf requires ~/.netsurf to exist, but it cannot be created.\n");
		}
	}
}

/**
 * Main entry point from OS.
 */
int main(int argc, char** argv)
{
	char *messages;
	char *options;

	/* check home directory is available */
	nsgtk_check_homedir();

	respaths = nsgtk_init_resource("${HOME}/.netsurf/:${NETSURFRES}:"GTK_RESPATH":./gtk/res");

	gtk_init(&argc, &argv);
	
        /* set standard error to be non-buffering */
	setbuf(stderr, NULL);

	options = filepath_find(respaths, "Choices");
	messages = filepath_find(respaths, "Messages");

	netsurf_init(&argc, &argv, options, messages);

	free(messages);
	free(options);

	gui_init(argc, argv, respaths);

	netsurf_main_loop();

	netsurf_exit();

	return 0;
}


void gui_poll(bool active)
{
	CURLMcode code;
	fd_set read_fd_set, write_fd_set, exc_fd_set;
	int max_fd;
	GPollFD *fd_list[1000];
	unsigned int fd_count = 0;
	bool block = true;

	schedule_run();
	
	if (browser_reformat_pending)
		block = false;

	if (active) {
		FD_ZERO(&read_fd_set);
		FD_ZERO(&write_fd_set);
		FD_ZERO(&exc_fd_set);
		code = curl_multi_fdset(fetch_curl_multi,
				&read_fd_set,
				&write_fd_set,
				&exc_fd_set,
				&max_fd);
		assert(code == CURLM_OK);
		for (int i = 0; i <= max_fd; i++) {
			if (FD_ISSET(i, &read_fd_set)) {
				GPollFD *fd = malloc(sizeof *fd);
				fd->fd = i;
				fd->events = G_IO_IN | G_IO_HUP | G_IO_ERR;
				g_main_context_add_poll(0, fd, 0);
				fd_list[fd_count++] = fd;
			}
			if (FD_ISSET(i, &write_fd_set)) {
				GPollFD *fd = malloc(sizeof *fd);
				fd->fd = i;
				fd->events = G_IO_OUT | G_IO_ERR;
				g_main_context_add_poll(0, fd, 0);
				fd_list[fd_count++] = fd;
			}
			if (FD_ISSET(i, &exc_fd_set)) {
				GPollFD *fd = malloc(sizeof *fd);
				fd->fd = i;
				fd->events = G_IO_ERR;
				g_main_context_add_poll(0, fd, 0);
				fd_list[fd_count++] = fd;
			}
		}
	}

	gtk_main_iteration_do(block);

	for (unsigned int i = 0; i != fd_count; i++) {
		g_main_context_remove_poll(0, fd_list[i]);
		free(fd_list[i]);
	}

	schedule_run();

	if (browser_reformat_pending)
		nsgtk_window_process_reformats();
}


void gui_quit(void)
{
	nsgtk_download_destroy();
	urldb_save_cookies(option_cookie_jar);
	urldb_save(option_url_file);
	nsgtk_cookies_destroy();
	nsgtk_history_destroy();
	nsgtk_hotlist_destroy();
	sslcert_cleanup();
	free(default_stylesheet_url);
	free(quirks_stylesheet_url);
	free(adblock_stylesheet_url);
	free(option_cookie_file);
	free(option_cookie_jar);
	free(print_options_file_location);
	free(search_engines_file_location);
	free(search_default_ico_location);
	free(toolbar_indices_file_location);
	gtk_fetch_filetype_fin();
}









static void nsgtk_select_menu_clicked(GtkCheckMenuItem *checkmenuitem,
					gpointer user_data)
{
	form_select_process_selection(select_menu_bw->current_content,
			select_menu_control, (intptr_t)user_data);
}

void gui_create_form_select_menu(struct browser_window *bw,
		struct form_control *control)
{

	intptr_t i;
	struct form_option *option;

	GtkWidget *menu_item;

	/* control->data.select.multiple is true if multiple selections
	 * are allowable.  We ignore this, as the core handles it for us.
	 * Yay. \o/
	 */

	if (select_menu != NULL)
		gtk_widget_destroy(select_menu);

	select_menu = gtk_menu_new();
	select_menu_bw = bw;
	select_menu_control = control;

	for (i = 0, option = control->data.select.items; option;
		i++, option = option->next) {
		menu_item = gtk_check_menu_item_new_with_label(option->text);
		if (option->selected)
			gtk_check_menu_item_set_active(
				GTK_CHECK_MENU_ITEM(menu_item), TRUE);

		g_signal_connect(menu_item, "toggled",
			G_CALLBACK(nsgtk_select_menu_clicked), (gpointer)i);

		gtk_menu_shell_append(GTK_MENU_SHELL(select_menu), menu_item);
	}

	gtk_widget_show_all(select_menu);

	gtk_menu_popup(GTK_MENU(select_menu), NULL, NULL, NULL,
			NULL /* data */, 0, gtk_get_current_event_time());

}

void gui_window_save_link(struct gui_window *g, const char *url, 
		const char *title)
{
}

void gui_launch_url(const char *url)
{
}

void warn_user(const char *warning, const char *detail)
{
	char buf[300];	/* 300 is the size the RISC OS GUI uses */

  	LOG(("%s %s", warning, detail ? detail : ""));
	fflush(stdout);

	snprintf(buf, sizeof(buf), "%s %s", messages_get(warning),
			detail ? detail : "");
	buf[sizeof(buf) - 1] = 0;

	gtk_label_set_text(GTK_LABEL(widWarning), buf);

	gtk_widget_show_all(GTK_WIDGET(nsgtk_warning_window));
}

void die(const char * const error)
{
	fprintf(stderr, "%s", error);
	exit(EXIT_FAILURE);
}


void gui_cert_verify(const char *url, const struct ssl_cert_info *certs, 
		unsigned long num, nserror (*cb)(bool proceed, void *pw),
		void *cbpw)
{	
	static struct nsgtk_treeview *ssl_window;	
	struct sslcert_session_data *data;
	GladeXML *x = glade_xml_new(glade_ssl_file_location, NULL, NULL);
	GtkButton *accept, *reject;
	void **session = calloc(sizeof(void *), 3);
	GtkWindow *window;
	GtkScrolledWindow *scrolled;
	GtkDrawingArea *drawing_area;

	data = sslcert_create_session_data(num, url, cb, cbpw);
		
	window = GTK_WINDOW(
			glade_xml_get_widget(x,"wndSSLProblem"));
	scrolled = GTK_SCROLLED_WINDOW(
			glade_xml_get_widget(x,"SSLScrolled"));
	drawing_area = GTK_DRAWING_AREA(
			glade_xml_get_widget(x,"SSLDrawingArea"));


	ssl_window = nsgtk_treeview_create(sslcert_get_tree_flags(),
			window, scrolled, drawing_area);
	
	if (ssl_window == NULL)
		return;
	
	sslcert_load_tree(nsgtk_treeview_get_tree(ssl_window), certs, data);
	
	accept = GTK_BUTTON(glade_xml_get_widget(x, "sslaccept"));
	reject = GTK_BUTTON(glade_xml_get_widget(x, "sslreject"));	

	session[0] = x;
	session[1] = ssl_window;
	session[2] = data;
	
#define CONNECT(obj, sig, callback, ptr) \
	g_signal_connect(G_OBJECT(obj), (sig), G_CALLBACK(callback), (ptr))	
	
	CONNECT(accept, "clicked", nsgtk_ssl_accept, session);
	CONNECT(reject, "clicked", nsgtk_ssl_reject, session);
 	CONNECT(window, "delete_event", G_CALLBACK(nsgtk_ssl_delete_event),
			(gpointer)session);
	
	gtk_widget_show(GTK_WIDGET(window));	
}

void nsgtk_ssl_accept(GtkButton *w, gpointer data)
{
	void **session = data;
	GladeXML *x = session[0];
	struct nsgtk_treeview *wnd = session[1];
	struct sslcert_session_data *ssl_data = session[2];

	sslcert_accept(ssl_data);
  		
	nsgtk_treeview_destroy(wnd);
	g_object_unref(G_OBJECT(x));
	free(session);
}

void nsgtk_ssl_reject(GtkWidget *w, gpointer data)
{
	void **session = data;
	GladeXML *x = session[0];
	struct nsgtk_treeview *wnd = session[1];
	struct sslcert_session_data *ssl_data = session[2];

	sslcert_reject(ssl_data);
	
	nsgtk_treeview_destroy(wnd);
	g_object_unref(G_OBJECT(x));
	free(session);
}

gboolean nsgtk_ssl_delete_event(GtkWidget *w, GdkEvent  *event, gpointer data)
{
	nsgtk_ssl_reject(w, data);
	return FALSE;
}

utf8_convert_ret utf8_to_local_encoding(const char *string, size_t len,
		char **result)
{
	assert(string && result);

	if (len == 0)
		len = strlen(string);

	*result = strndup(string, len);
	if (!(*result))
		return UTF8_CONVERT_NOMEM;

	return UTF8_CONVERT_OK;
}


utf8_convert_ret utf8_from_local_encoding(const char *string, size_t len,
		char **result)
{
	assert(string && result);

	if (len == 0)
		len = strlen(string);

	*result = strndup(string, len);
	if (!(*result))
		return UTF8_CONVERT_NOMEM;

	return UTF8_CONVERT_OK;
}


char *path_to_url(const char *path)
{
	int urllen;
	char *url;

	if (path == NULL) {
		return NULL;
	}
		
	urllen = strlen(path) + FILE_SCHEME_PREFIX_LEN + 1;

	url = malloc(urllen);
	if (url == NULL) {
		return NULL;
	}

	if (*path == '/') {
		path++; /* file: paths are already absolute */
	} 

	snprintf(url, urllen, "%s%s", FILE_SCHEME_PREFIX, path);

	return url;
}


char *url_to_path(const char *url)
{
	char *path;
	char *respath;
	url_func_result res; /* result from url routines */

	res = url_path(url, &path);
	if (res != URL_FUNC_OK) {
		return NULL;
	}

	res = url_unescape(path, &respath);
	free(path);
	if (res != URL_FUNC_OK) {
		return NULL;
	}

	return respath;
}

#ifdef WITH_PDF_EXPORT

void PDF_Password(char **owner_pass, char **user_pass, char *path)
{
	GladeXML *x = glade_xml_new(glade_password_file_location, NULL, NULL);
	GtkWindow *wnd = GTK_WINDOW(glade_xml_get_widget(x, "wndPDFPassword"));
	GtkButton *ok, *no;
	void **data = malloc(5 * sizeof(void *));

	*owner_pass = NULL;
	*user_pass = NULL;

	data[0] = owner_pass;
	data[1] = user_pass;
	data[2] = wnd;
	data[3] = x;
	data[4] = path;

	ok = GTK_BUTTON(glade_xml_get_widget(x, "buttonPDFSetPassword"));
	no = GTK_BUTTON(glade_xml_get_widget(x, "buttonPDFNoPassword"));

	g_signal_connect(G_OBJECT(ok), "clicked",
			 G_CALLBACK(nsgtk_PDF_set_pass), (gpointer)data);
	g_signal_connect(G_OBJECT(no), "clicked",
			 G_CALLBACK(nsgtk_PDF_no_pass), (gpointer)data);

	gtk_widget_show(GTK_WIDGET(wnd));
}

static void nsgtk_PDF_set_pass(GtkButton *w, gpointer data)
{
	char **owner_pass = ((void **)data)[0];
	char **user_pass = ((void **)data)[1];
	GtkWindow *wnd = ((void **)data)[2];
	GladeXML *x = ((void **)data)[3];
	char *path = ((void **)data)[4];

	char *op, *op1;
	char *up, *up1;

	op = strdup(gtk_entry_get_text(GTK_ENTRY(glade_xml_get_widget(x,
			"entryPDFOwnerPassword"))));
	op1 = strdup(gtk_entry_get_text(GTK_ENTRY(glade_xml_get_widget(x,
			"entryPDFOwnerPassword1"))));
	up = strdup(gtk_entry_get_text(GTK_ENTRY(glade_xml_get_widget(x,
		    	"entryPDFUserPassword"))));
	up1 = strdup(gtk_entry_get_text(GTK_ENTRY(glade_xml_get_widget(x,
		     	"entryPDFUserPassword1"))));


	if (op[0] == '\0') {
		gtk_label_set_text(GTK_LABEL(glade_xml_get_widget(x,
				"labelInfo")),
       				"Owner password must be at least 1 character long:");
		free(op);
		free(up);
	}
	else if (!strcmp(op, up)) {
		gtk_label_set_text(GTK_LABEL(glade_xml_get_widget(x,
				"labelInfo")),
       				"User and owner passwords must be different:");
		free(op);
		free(up);
	}
	else if (!strcmp(op, op1) && !strcmp(up, up1)) {

		*owner_pass = op;
		if (up[0] == '\0')
			free(up);
		else
			*user_pass = up;

		free(data);
		gtk_widget_destroy(GTK_WIDGET(wnd));
		g_object_unref(G_OBJECT(x));

		save_pdf(path);
		free(path);
	}
	else {
		gtk_label_set_text(GTK_LABEL(glade_xml_get_widget(x,
				"labelInfo")), "Passwords not confirmed:");
		free(op);
		free(up);
	}

	free(op1);
	free(up1);
}

static void nsgtk_PDF_no_pass(GtkButton *w, gpointer data)
{
	GtkWindow *wnd = ((void **)data)[2];
	GladeXML *x = ((void **)data)[3];
	char *path = ((void **)data)[4];

	free(data);

	gtk_widget_destroy(GTK_WIDGET(wnd));
	g_object_unref(G_OBJECT(x));

	save_pdf(path);
	free(path);
}
#endif

uint32_t gtk_gui_gdkkey_to_nskey(GdkEventKey *key)
{
	/* this function will need to become much more complex to support
	 * everything that the RISC OS version does.  But this will do for
	 * now.  I hope.
	 */
	switch (key->keyval) {
	
	case GDK_Tab:
		return KEY_TAB;

	case GDK_BackSpace:
		if (key->state & GDK_SHIFT_MASK)
			return KEY_DELETE_LINE_START;
		else
			return KEY_DELETE_LEFT;
	case GDK_Delete:
		if (key->state & GDK_SHIFT_MASK)
			return KEY_DELETE_LINE_END;
		else
			return KEY_DELETE_RIGHT;
	case GDK_Linefeed:	return 13;
	case GDK_Return:	return 10;
	case GDK_Left:		return KEY_LEFT;
	case GDK_Right:		return KEY_RIGHT;
	case GDK_Up:		return KEY_UP;
	case GDK_Down:		return KEY_DOWN;
	case GDK_Home:
		if (key->state & GDK_CONTROL_MASK)
			return KEY_TEXT_START;
		else
			return KEY_LINE_START;
	case GDK_End:
		if (key->state & GDK_CONTROL_MASK)
			return KEY_TEXT_END;
		else
			return KEY_LINE_END;
	case GDK_Page_Up:
		return KEY_PAGE_UP;
	case GDK_Page_Down:
		return KEY_PAGE_DOWN;
	case 'a':
		if (key->state & GDK_CONTROL_MASK)
			return KEY_SELECT_ALL;
		return gdk_keyval_to_unicode(key->keyval);
	case 'u':
		if (key->state & GDK_CONTROL_MASK)
			return KEY_CLEAR_SELECTION;
		return gdk_keyval_to_unicode(key->keyval);
	case GDK_Escape:
		return KEY_ESCAPE;

		/* Modifiers - do nothing for now */
	case GDK_Shift_L:
	case GDK_Shift_R:
	case GDK_Control_L:
	case GDK_Control_R:
	case GDK_Caps_Lock:
	case GDK_Shift_Lock:
	case GDK_Meta_L:
	case GDK_Meta_R:
	case GDK_Alt_L:
	case GDK_Alt_R:
	case GDK_Super_L:
	case GDK_Super_R:
	case GDK_Hyper_L:
	case GDK_Hyper_R:	
		return 0;

	default:		
		return gdk_keyval_to_unicode(key->keyval);
        }
}

/**
 * Return the filename part of a full path
 *
 * \param path full path and filename
 * \return filename (will be freed with free())
 */

char *filename_from_path(char *path)
{
	char *leafname;

	leafname = strrchr(path, '/');
	if (!leafname)
		leafname = path;
	else
		leafname += 1;

	return strdup(leafname);
}

/**
 * Add a path component/filename to an existing path
 *
 * \param path buffer containing path + free space
 * \param length length of buffer "path"
 * \param newpart string containing path component to add to path
 * \return true on success
 */

bool path_add_part(char *path, int length, const char *newpart)
{
	if(path[strlen(path) - 1] != '/')
		strncat(path, "/", length);

	strncat(path, newpart, length);

	return true;
}