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jpegparse: refactor COM parsing

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add gst_jpeg_parse_com () and get_utf8_from_data () to extract and
validate comment format

https://bugzilla.gnome.org/show_bug.cgi?id=626618
This commit is contained in:
Víctor Manuel Jáquez Leal 2010-08-13 12:38:02 +02:00 committed by Stefan Kost
parent c9b2c4abfe
commit 0e27f49dd4
1 changed files with 40 additions and 22 deletions
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62
gst/jpegformat/gstjpegparse.c
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@ -628,6 +628,44 @@ gst_jpeg_parse_app1 (GstJpegParse * parse, GstByteReader * reader)
return TRUE;
}
static inline gchar *
get_utf8_from_data (const guint8 * data, guint16 size)
{
const gchar *env_vars[] = { "GST_JPEG_TAG_ENCODING",
"GST_TAG_ENCODING", NULL
};
const char *str = (gchar *) data;
return gst_tag_freeform_string_to_utf8 (str, size, env_vars);
}
/* read comment and post as tag */
static inline gboolean
gst_jpeg_parse_com (GstJpegParse * parse, GstByteReader * reader)
{
const guint8 *data = NULL;
guint16 size = 0;
gchar *comment;
if (!gst_byte_reader_get_uint16_be (reader, &size))
return FALSE;
size -= 2;
if (!gst_byte_reader_get_data (reader, size, &data))
return FALSE;
comment = get_utf8_from_data (data, size);
if (comment) {
GstTagList *taglist = get_tag_list (parse);
gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
GST_TAG_COMMENT, comment, NULL);
g_free (comment);
}
return TRUE;
}
static gboolean
gst_jpeg_parse_read_header (GstJpegParse * parse, GstBuffer * buffer)
{
@ -660,30 +698,10 @@ gst_jpeg_parse_read_header (GstJpegParse * parse, GstBuffer * buffer)
goto error;
break;
case COM:{ /* read comment and post as tag */
const guint8 *comment = NULL;
gchar *comm;
const gchar *env_vars[] = { "GST_JPEG_TAG_ENCODING",
"GST_TAG_ENCODING", NULL
};
if (!gst_byte_reader_get_uint16_be (&reader, &size))
case COM:
if (!gst_jpeg_parse_com (parse, &reader))
goto error;
if (!gst_byte_reader_get_data (&reader, size - 2, &comment))
goto error;
comm = (gchar *) comment;
comm = gst_tag_freeform_string_to_utf8 (comm, size - 2, env_vars);
if (comm) {
if (!parse->priv->tags)
parse->priv->tags = gst_tag_list_new ();
gst_tag_list_add (parse->priv->tags, GST_TAG_MERGE_REPLACE,
GST_TAG_COMMENT, comm, NULL);
g_free (comm);
}
break;
}
case APP1:
if (!gst_jpeg_parse_app1 (parse, &reader))