transmission/gtk/favicon.c

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C
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/*
* This file Copyright (C) Mnemosyne LLC
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2 (b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id$
*/
#include <glib/gstdio.h> /* g_remove () */
#include <gtk/gtk.h>
#include <libtransmission/transmission.h>
#include <libtransmission/web.h> /* tr_webRun () */
#include "favicon.h"
#include "util.h" /* gtr_get_host_from_url () */
#define IMAGE_TYPES 4
static const char * image_types[IMAGE_TYPES] = { "ico", "png", "gif", "jpg" };
struct favicon_data
{
tr_session * session;
GFunc func;
gpointer data;
char * host;
char * contents;
size_t len;
int type;
};
static char*
get_url (const char * host, int image_type)
{
return g_strdup_printf ("http://%s/favicon.%s", host, image_types[image_type]);
}
static char*
favicon_get_cache_dir (void)
{
static char * dir = NULL;
if (dir == NULL)
{
dir = g_build_filename (g_get_user_cache_dir (),
"transmission",
"favicons",
NULL);
g_mkdir_with_parents (dir, 0777);
}
return dir;
}
static char*
favicon_get_cache_filename (const char * host)
{
return g_build_filename (favicon_get_cache_dir (), host, NULL);
}
static void
favicon_save_to_cache (const char * host, const void * data, size_t len)
{
char * filename = favicon_get_cache_filename (host);
g_file_set_contents (filename, data, len, NULL);
g_free (filename);
}
static GdkPixbuf*
favicon_load_from_cache (const char * host)
{
char * filename = favicon_get_cache_filename (host);
GdkPixbuf * pixbuf = gdk_pixbuf_new_from_file_at_size (filename, 16, 16, NULL);
if (pixbuf == NULL) /* bad file */
g_remove (filename);
g_free (filename);
return pixbuf;
}
static void favicon_web_done_cb (tr_session*, bool, bool, long, const void*, size_t, void*);
static gboolean
favicon_web_done_idle_cb (gpointer vfav)
{
GdkPixbuf * pixbuf = NULL;
gboolean finished = FALSE;
struct favicon_data * fav = vfav;
if (fav->len > 0) /* we got something... try to make a pixbuf from it */
{
favicon_save_to_cache (fav->host, fav->contents, fav->len);
pixbuf = favicon_load_from_cache (fav->host);
finished = pixbuf != NULL;
}
if (!finished) /* no pixbuf yet... */
{
if (++fav->type == IMAGE_TYPES) /* failure */
{
finished = TRUE;
}
else /* keep trying */
{
char * url = get_url (fav->host, fav->type);
g_free (fav->contents);
fav->contents = NULL;
fav->len = 0;
tr_webRun (fav->session, url, NULL, NULL, favicon_web_done_cb, fav);
g_free (url);
}
}
if (finished)
{
fav->func (pixbuf, fav->data);
g_free (fav->host);
g_free (fav->contents);
g_free (fav);
}
return FALSE;
}
static void
favicon_web_done_cb (tr_session * session UNUSED,
bool did_connect UNUSED,
bool did_timeout UNUSED,
long code UNUSED,
const void * data,
size_t len,
void * vfav)
{
struct favicon_data * fav = vfav;
fav->contents = g_memdup (data, len);
fav->len = len;
gdk_threads_add_idle (favicon_web_done_idle_cb, fav);
}
void
gtr_get_favicon (tr_session * session,
const char * host,
GFunc pixbuf_ready_func,
gpointer pixbuf_ready_func_data)
{
GdkPixbuf * pixbuf = favicon_load_from_cache (host);
if (pixbuf != NULL)
{
pixbuf_ready_func (pixbuf, pixbuf_ready_func_data);
}
else
{
struct favicon_data * data;
char * url = get_url (host, 0);
data = g_new (struct favicon_data, 1);
data->session = session;
data->func = pixbuf_ready_func;
data->data = pixbuf_ready_func_data;
data->host = g_strdup (host);
data->type = 0;
tr_webRun (session, url, NULL, NULL, favicon_web_done_cb, data);
g_free (url);
}
}
void
gtr_get_favicon_from_url (tr_session * session,
const char * url,
GFunc pixbuf_ready_func,
gpointer pixbuf_ready_func_data)
{
char host[1024];
gtr_get_host_from_url (host, sizeof (host), url);
gtr_get_favicon (session, host, pixbuf_ready_func, pixbuf_ready_func_data);
}