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tag: id3v2: fix parsing of UTF-16 text on systems with crippled iconv

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Use g_utf16_to_utf8() instead of the more generic g_convert(), so
that we can extract text in UTF-16 format even on embedded systems
with crippled iconv support.

This code path is exercised by the id3demux test_unsync_v23
check in gst-plugins-good.

https://bugzilla.gnome.org/show_bug.cgi?id=741144
This commit is contained in:
Tim-Philipp Müller 2015-05-25 22:37:56 +01:00
parent a5f6c4583c
commit ea5d912b9f
1 changed files with 51 additions and 14 deletions
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65
gst-libs/gst/tag/id3v2frames.c
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@ -953,16 +953,16 @@ static const gchar utf16leenc[] = "UTF-16LE";
static const gchar utf16beenc[] = "UTF-16BE";
static gboolean
find_utf16_bom (gchar * data, const gchar ** p_in_encoding)
find_utf16_bom (gchar * data, gint * p_data_endianness)
{
guint16 marker = (GST_READ_UINT8 (data) << 8) | GST_READ_UINT8 (data + 1);
switch (marker) {
case 0xFFFE:
*p_in_encoding = utf16leenc;
*p_data_endianness = G_LITTLE_ENDIAN;
return TRUE;
case 0xFEFF:
*p_in_encoding = utf16beenc;
*p_data_endianness = G_BIG_ENDIAN;
return TRUE;
default:
break;
@ -1047,32 +1047,69 @@ parse_insert_string_field (guint8 encoding, gchar * data, gint data_size,
case ID3V2_ENCODING_UTF16:
case ID3V2_ENCODING_UTF16BE:
{
const gchar *in_encode;
gunichar2 *utf16;
gint data_endianness;
glong n_read = 0, size = 0;
guint len, i;
if (encoding == ID3V2_ENCODING_UTF16)
in_encode = utf16enc;
data_endianness = G_BYTE_ORDER;
else
in_encode = utf16beenc;
data_endianness = G_BIG_ENDIAN;
/* Sometimes we see strings with multiple BOM markers at the start.
* In that case, we assume the innermost one is correct. If that fails
* to produce valid UTF-8, we try the other endianness anyway */
while (data_size > 2 && find_utf16_bom (data, &in_encode)) {
while (data_size > 2 && find_utf16_bom (data, &data_endianness)) {
data += 2; /* skip BOM */
data_size -= 2;
}
field = g_convert (data, data_size, "UTF-8", in_encode, NULL, NULL, NULL);
/* alloc needed to ensure correct alignment which is required by GLib */
len = data_size / 2;
utf16 = g_try_new (gunichar2, len + 1);
if (utf16 == NULL)
break;
if (field == NULL || !g_utf8_validate (field, -1, NULL)) {
/* As a fallback, try interpreting UTF-16 in the other endianness */
if (in_encode == utf16beenc)
field = g_convert (data, data_size, "UTF-8", utf16leenc,
NULL, NULL, NULL);
memcpy (utf16, data, 2 * len);
GST_LOG ("Trying interpreting data as UTF-16-%s first",
(data_endianness == G_LITTLE_ENDIAN) ? "LE" : "BE");
if (data_endianness != G_BYTE_ORDER) {
/* convert to native endian UTF-16 */
for (i = 0; i < len; ++i)
utf16[i] = GUINT16_SWAP_LE_BE (utf16[i]);
}
}
/* convert to UTF-8 */
field = g_utf16_to_utf8 (utf16, len, &n_read, &size, NULL);
if (field != NULL && n_read > 0 && g_utf8_validate (field, -1, NULL)) {
g_free (utf16);
break;
}
GST_DEBUG ("Trying interpreting data as UTF-16-%s now as fallback",
(data_endianness == G_LITTLE_ENDIAN) ? "BE" : "LE");
for (i = 0; i < len; ++i)
utf16[i] = GUINT16_SWAP_LE_BE (utf16[i]);
g_free (field);
n_read = size = 0;
/* try again */
field = g_utf16_to_utf8 (utf16, len, &n_read, &size, NULL);
g_free (utf16);
if (field != NULL && n_read > 0 && g_utf8_validate (field, -1, NULL))
break;
GST_DEBUG ("Could not convert UTF-16 string to UTF-8");
g_free (field);
field = NULL;
break;
}
case ID3V2_ENCODING_ISO8859:
if (g_utf8_validate (data, data_size, NULL))
field = g_strndup (data, data_size);