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netsurf/render/favicon.c

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/*
* Copyright 2007 James Bursa <bursa@users.sourceforge.net>
* Copyright 2009 Mark Benjamin <netsurf-browser.org.MarkBenjamin@dfgh.net>
*
* 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 <string.h>
#include "content/content_protected.h"
#include "content/hlcache.h"
#include "desktop/shape.h"
#include "render/favicon.h"
#include "render/html.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/talloc.h"
#include "utils/url.h"
#include "utils/utils.h"
static char *favicon_get_icon_ref(struct content *c, xmlNode *html);
static nserror favicon_callback(hlcache_handle *icon,
const hlcache_event *event, void *pw);
/**
* retrieve 1 url reference to 1 favicon
* \param html xml node of html element
* \return pointer to url; NULL for no icon; caller owns returned pointer
*/
char *favicon_get_icon_ref(struct content *c, xmlNode *html)
{
xmlNode *node = html;
char *rel, *href, *url, *url2 = NULL;
url_func_result res;
while (node) {
if (node->children != NULL) { /* children */
node = node->children;
} else if (node->next != NULL) { /* siblings */
node = node->next;
} else { /* ancestor siblings */
while (node != NULL && node->next == NULL)
node = node->parent;
if (node == NULL)
break;
node = node->next;
}
assert(node != NULL);
if (node->type != XML_ELEMENT_NODE)
continue;
if (strcmp((const char *) node->name, "link") == 0) {
/* rel=<space separated list, including 'icon'> */
if ((rel = (char *) xmlGetProp(node,
(const xmlChar *) "rel")) == NULL)
continue;
if (strcasestr(rel, "icon") == 0) {
xmlFree(rel);
continue;
}
if (strcasecmp(rel, "apple-touch-icon") == 0) {
xmlFree(rel);
continue;
}
xmlFree(rel);
if ((href = (char *) xmlGetProp(node,
(const xmlChar *) "href")) == NULL)
continue;
res = url_join(href, c->data.html.base_url, &url);
xmlFree(href);
if (res != URL_FUNC_OK)
continue;
if (url2 != NULL) {
free(url2);
url2 = NULL;
}
res = url_normalize(url, &url2);
free(url);
if (res != URL_FUNC_OK) {
url2 = NULL;
if (res == URL_FUNC_NOMEM)
return NULL;
continue;
}
}
}
if (url2 == NULL) {
char *scheme;
/* There was no icon link defined in the HTML source data.
* If the HTML document's base URL uses either the HTTP or
* HTTPS schemes, then try using "<scheme>://host/favicon.ico"
*/
if (url_scheme(c->data.html.base_url, &scheme) != URL_FUNC_OK)
return NULL;
if (strcasecmp(scheme, "http") != 0 &&
strcasecmp(scheme, "https") != 0) {
free(scheme);
return NULL;
}
free(scheme);
if (url_join("/favicon.ico", c->data.html.base_url, &url2)
!= URL_FUNC_OK)
return NULL;
}
return url2;
}
/**
* retrieve 1 favicon
* \param c content structure
* \param html xml node of html element
* \return true for success, false for error
*/
bool favicon_get_icon(struct content *c, xmlNode *html)
{
static const content_type permitted_types[] = {
#ifdef WITH_BMP
CONTENT_ICO,
#endif
#if defined(WITH_MNG) || defined(WITH_PNG)
CONTENT_PNG,
#endif
#ifdef WITH_GIF
CONTENT_GIF,
#endif
CONTENT_UNKNOWN
};
char *url;
nserror error;
url = favicon_get_icon_ref(c, html);
if (url == NULL)
return false;
error = hlcache_handle_retrieve(url, LLCACHE_RETRIEVE_NO_ERROR_PAGES,
content__get_url(c), NULL, favicon_callback, c, NULL,
permitted_types, &c->data.html.favicon);
if (error == NSERROR_OK) {
c->active += 1;
}
free(url);
return error == NSERROR_OK;
}
/**
* Callback for fetchcache() for linked favicon
*/
nserror favicon_callback(hlcache_handle *icon,
const hlcache_event *event, void *pw)
{
struct content *c = pw;
bool consider_done = false, consider_redraw = false;
switch (event->type) {
case CONTENT_MSG_LOADING:
/* check that the favicon is really a correct image type */
if (content_get_type(icon) == CONTENT_UNKNOWN) {
union content_msg_data msg_data;
LOG(("%s is not a favicon", content_get_url(icon)));
hlcache_handle_abort(icon);
hlcache_handle_release(icon);
c->data.html.favicon = NULL;
c->active -= 1;
consider_done = true;
content_add_error(c, "NotFavIco", 0);
msg_data.error = messages_get("NotFavIco");
content_broadcast(c, CONTENT_MSG_STATUS, msg_data);
}
break;
case CONTENT_MSG_READY:
break;
case CONTENT_MSG_DONE:
c->active -= 1;
consider_done = true;
break;
case CONTENT_MSG_ERROR:
LOG(("favicon %s failed: %s",
content_get_url(icon), event->data.error));
hlcache_handle_release(c->data.html.favicon);
c->data.html.favicon = NULL;
content_add_error(c, "?", 0);
c->active -= 1;
consider_done = true;
break;
case CONTENT_MSG_STATUS:
content_broadcast(c, CONTENT_MSG_STATUS, event->data);
break;
case CONTENT_MSG_REDRAW:
/* Fall through */
case CONTENT_MSG_REFRESH:
/* Fall through */
case CONTENT_MSG_REFORMAT:
consider_redraw = true;
break;
default:
assert(0);
}
#ifdef WITH_GIF
if (consider_redraw && (c->data.html.favicon != NULL) &&
(content_get_type(c->data.html.favicon) ==
CONTENT_GIF)) {
union content_msg_data msg_data;
struct rect clip;
/* This is needed in order to cause animated GIFs to update
* their bitmap */
clip.x0 = clip.y0 = 0;
clip.x1 = clip.y1 = 0;
content_redraw(c->data.html.favicon, 0, 0, -1, -1, &clip,
1.0, 0);
content_broadcast(c, CONTENT_MSG_FAVICON_REFRESH, msg_data);
}
#endif
if (consider_done && (c->active == 0)) {
/* all objects have arrived */
content__reformat(c, c->available_width, c->height);
html_set_status(c, "");
content_set_done(c);
}
return NSERROR_OK;
}
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