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/* GStreamer data:// uri source element
* Copyright (C) 2009 Igalia S.L
* Copyright (C) 2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/*<private>
* # Data URLs
*
* These function allow encoding and decoding of data: URLs, see
* [RFC 2397](http://tools.ietf.org/html/rfc2397) for more information.
*/
#include "config.h"
#include "gtkcssdataurlprivate.h"
#include <string.h>
#define _(x) x
/*<private>
* gtk_css_data_url_parse:
* @url: the URL to parse
* @out_mimetype: (out nullable optional): Return location to set the contained
* mime type to. If no mime type was specified, this value is set to %NULL.
* @error: error location
*
* Decodes a data URL according to RFC2397 and returns the decoded data.
*
* Returns: a new `GBytes` with the decoded data
*/
GBytes *
gtk_css_data_url_parse (const char *url,
char **out_mimetype,
GError **error)
{
char *mimetype = NULL;
const char *parameters_start;
const char *data_start;
GBytes *bytes;
gboolean base64 = FALSE;
char *charset = NULL;
gpointer bdata;
gsize bsize;
/* url must be an URI as defined in RFC 2397
* data:[<mediatype>][;base64],<data>
*/
if (g_ascii_strncasecmp ("data:", url, 5) != 0)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_FILENAME,
_("Not a data: URL"));
return NULL;
}
url += 5;
parameters_start = strchr (url, ';');
data_start = strchr (url, ',');
if (data_start == NULL)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_FILENAME,
_("Malformed data: URL"));
return NULL;
}
if (parameters_start > data_start)
parameters_start = NULL;
if (data_start != url && parameters_start != url)
{
mimetype = g_strndup (url,
(parameters_start ? parameters_start
: data_start) - url);
}
else
{
mimetype = NULL;
}
if (parameters_start != NULL)
{
char *parameters_str;
char **parameters;
guint i;
parameters_str = g_strndup (parameters_start + 1, data_start - parameters_start - 1);
parameters = g_strsplit (parameters_str, ";", -1);
for (i = 0; parameters[i] != NULL; i++)
{
if (g_ascii_strcasecmp ("base64", parameters[i]) == 0)
{
base64 = TRUE;
}
else if (g_ascii_strncasecmp ("charset=", parameters[i], 8) == 0)
{
g_free (charset);
charset = g_strdup (parameters[i] + 8);
}
}
g_free (parameters_str);
g_strfreev (parameters);
}
/* Skip comma */
data_start += 1;
if (base64)
{
bdata = g_base64_decode (data_start, &bsize);
}
else
{
/* URI encoded, i.e. "percent" encoding */
/* XXX: This doesn't allow nul bytes */
bdata = g_uri_unescape_string (data_start, NULL);
if (bdata == NULL)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_FILENAME,
_("Could not unescape string"));
g_free (mimetype);
return NULL;
}
bsize = strlen (bdata);
}
/* Convert to UTF8 */
if ((mimetype == NULL || g_ascii_strcasecmp ("text/plain", mimetype) == 0) &&
charset && g_ascii_strcasecmp ("US-ASCII", charset) != 0
&& g_ascii_strcasecmp ("UTF-8", charset) != 0)
{
gsize read;
gsize written;
gpointer data;
data = g_convert_with_fallback (bdata, bsize,
"UTF-8", charset,
(char *) "*",
&read, &written, NULL);
g_free (bdata);
bdata = data;
bsize = written;
}
bytes = g_bytes_new_take (bdata, bsize);
g_free (charset);
if (out_mimetype)
*out_mimetype = mimetype;
else
g_free (mimetype);
return bytes;
}
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