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gst/typefind/gsttypefindfunctions.c: Add typefind functions for tar archives, ar archives,

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Original commit message from CVS:
* gst/typefind/gsttypefindfunctions.c: (tar_type_find),
(ar_type_find), (msdos_type_find), (plugin_init):
Add typefind functions for tar archives, ar archives,
RAR archives, and msdos-executables (dlls, exe, etc.).
Some of those would be wrongly identified as mpeg
streams of some sort before (#315550).
This commit is contained in:
Tim-Philipp Müller 2005-10-09 19:01:10 +00:00
parent 9be025e197
commit bca499edda
2 changed files with 92 additions and 0 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2005-10-09 Tim-Philipp Müller <tim at centricular dot net>
* gst/typefind/gsttypefindfunctions.c: (tar_type_find),
(ar_type_find), (msdos_type_find), (plugin_init):
Add typefind functions for tar archives, ar archives,
RAR archives, and msdos-executables (dlls, exe, etc.).
Some of those would be wrongly identified as mpeg
streams of some sort before (#315550).
2005-10-09 Stefan Kost <ensonic@users.sf.net>
* configure.ac:

83
gst/typefind/gsttypefindfunctions.c
View file

@ -1555,6 +1555,75 @@ cmml_type_find (GstTypeFind * tf, gpointer private)
}
}
/*** application/x-tar ***/
static GstStaticCaps tar_caps = GST_STATIC_CAPS ("application/x-tar");
#define TAR_CAPS (gst_static_caps_get(&tar_caps))
#define OLDGNU_MAGIC "ustar " /* 7 chars and a NUL */
#define NEWGNU_MAGIC "ustar" /* 5 chars and a NUL */
static void
tar_type_find (GstTypeFind * tf, gpointer unused)
{
guint8 *data = gst_type_find_peek (tf, 257, 8);
/* of course we are not certain, but we don't want other typefind funcs
* to detect formats of files within the tar archive, e.g. mp3s */
if (data) {
if (memcmp (data, OLDGNU_MAGIC, 8) == 0) { /* sic */
gst_type_find_suggest (tf, GST_TYPE_FIND_NEARLY_CERTAIN, TAR_CAPS);
} else if (memcmp (data, NEWGNU_MAGIC, 6) == 0 && /* sic */
g_ascii_isdigit (data[6]) && g_ascii_isdigit (data[7])) {
gst_type_find_suggest (tf, GST_TYPE_FIND_NEARLY_CERTAIN, TAR_CAPS);
}
}
}
/*** application/x-ar ***/
static GstStaticCaps ar_caps = GST_STATIC_CAPS ("application/x-ar");
#define AR_CAPS (gst_static_caps_get(&ar_caps))
static void
ar_type_find (GstTypeFind * tf, gpointer unused)
{
guint8 *data = gst_type_find_peek (tf, 0, 24);
if (data && memcmp (data, "!<arch>", 7) == 0) {
gint i;
for (i = 7; i < 24; ++i) {
if (!g_ascii_isprint (data[i]) && data[i] != '\n') {
gst_type_find_suggest (tf, GST_TYPE_FIND_POSSIBLE, AR_CAPS);
}
}
gst_type_find_suggest (tf, GST_TYPE_FIND_NEARLY_CERTAIN, AR_CAPS);
}
}
/*** application/x-ms-dos-executable ***/
static GstStaticCaps msdos_caps =
GST_STATIC_CAPS ("application/x-ms-dos-executable");
#define MSDOS_CAPS (gst_static_caps_get(&msdos_caps))
/* see http://www.madchat.org/vxdevl/papers/winsys/pefile/pefile.htm */
static void
msdos_type_find (GstTypeFind * tf, gpointer unused)
{
guint8 *data = gst_type_find_peek (tf, 0, 64);
if (data && data[0] == 'M' && data[1] == 'Z' &&
GST_READ_UINT16_LE (data + 8) == 4) {
guint32 pe_offset = GST_READ_UINT32_LE (data + 60);
data = gst_type_find_peek (tf, pe_offset, 2);
if (data && data[0] == 'P' && data[1] == 'E') {
gst_type_find_suggest (tf, GST_TYPE_FIND_NEARLY_CERTAIN, MSDOS_CAPS);
}
}
}
/*** generic typefind for streams that have some data at a specific position***/
typedef struct
{
@ -1693,6 +1762,12 @@ plugin_init (GstPlugin * plugin)
static gchar *m4a_exts[] = { "m4a", NULL };
static gchar *q3gp_exts[] = { "3gp", NULL };
static gchar *aac_exts[] = { "aac", NULL };
static gchar *rar_exts[] = { "rar", NULL };
static gchar *tar_exts[] = { "tar", NULL };
static gchar *ar_exts[] = { "a", NULL };
static gchar *msdos_exts[] = { "dll", "exe", "ocx", "sys", "scr",
"msstyles", "cpl", NULL
};
GST_DEBUG_CATEGORY_INIT (type_find_debug, "typefindfunctions",
GST_DEBUG_FG_GREEN | GST_DEBUG_BG_RED, "generic type find functions");
@ -1839,6 +1914,14 @@ plugin_init (GstPlugin * plugin)
GST_RANK_MARGINAL, NULL, "\177ELF", 4, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER (plugin, "adts_mpeg_stream", GST_RANK_SECONDARY,
aac_type_find, aac_exts, AAC_CAPS, NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "application/x-rar",
GST_RANK_SECONDARY, rar_exts, "Rar!", 4, GST_TYPE_FIND_LIKELY);
TYPE_FIND_REGISTER (plugin, "application/x-tar", GST_RANK_SECONDARY,
tar_type_find, tar_exts, TAR_CAPS, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-ar", GST_RANK_SECONDARY,
ar_type_find, ar_exts, AR_CAPS, NULL);
TYPE_FIND_REGISTER (plugin, "application/x-ms-dos-executable",
GST_RANK_SECONDARY, msdos_type_find, msdos_exts, MSDOS_CAPS, NULL);
return TRUE;
}