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mpdparser: add some checks to duration parsing
https://bugzilla.gnome.org/show_bug.cgi?id=752336
This commit is contained in:
Vincent Penquerc'h
parent
7dca9fb3f4
commit
045a03c14a
1 changed files with 217 additions and 155 deletions
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@ -939,6 +939,221 @@ convert_to_millisecs (guint decimals, gint pos)
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return decimals * num / den;
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}
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static gboolean
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accumulate (guint64 * v, guint64 mul, guint64 add)
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{
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guint64 tmp;
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if (*v > G_MAXUINT64 / mul)
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return FALSE;
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tmp = *v * mul;
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if (tmp > G_MAXUINT64 - add)
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return FALSE;
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*v = tmp + add;
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return TRUE;
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}
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static gboolean
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gst_mpdparser_parse_duration (const char *str, guint64 * value)
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{
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gint ret, len, pos, posT;
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gint years = -1, months = -1, days = -1, hours = -1, minutes = -1, seconds =
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-1, decimals = -1, read;
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gboolean have_ms = FALSE;
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guint64 tmp_value;
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len = strlen (str);
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GST_TRACE ("duration: %s, len %d", str, len);
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if (strspn (str, "PT0123456789., \tHMDSY") < len) {
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GST_WARNING ("Invalid character found: '%s'", str);
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goto error;
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}
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/* skip leading/trailing whitespace */
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while (strchr (" \t", str[0])) {
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str++;
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len--;
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}
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while (len > 0 && strchr (" \t", str[len - 1]))
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--len;
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/* read "P" for period */
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if (str[0] != 'P') {
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GST_WARNING ("P not found at the beginning of the string!");
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goto error;
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}
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str++;
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len--;
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/* read "T" for time (if present) */
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posT = strcspn (str, "T");
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len -= posT;
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if (posT > 0) {
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/* there is some room between P and T, so there must be a period section */
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/* read years, months, days */
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do {
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GST_TRACE ("parsing substring %s", str);
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pos = strcspn (str, "YMD");
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ret = sscanf (str, "%u", &read);
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if (ret != 1) {
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GST_WARNING ("can not read integer value from string %s!", str);
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goto error;
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}
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switch (str[pos]) {
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case 'Y':
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if (years != -1 || months != -1 || days != -1) {
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GST_WARNING ("year, month or day was already set");
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goto error;
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}
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years = read;
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break;
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case 'M':
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if (months != -1 || days != -1) {
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GST_WARNING ("month or day was already set");
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goto error;
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}
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months = read;
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if (months >= 12) {
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GST_WARNING ("Month out of range");
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goto error;
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}
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break;
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case 'D':
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if (days != -1) {
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GST_WARNING ("day was already set");
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goto error;
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}
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days = read;
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if (days >= 31) {
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GST_WARNING ("Day out of range");
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goto error;
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}
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break;
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default:
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GST_WARNING ("unexpected char %c!", str[pos]);
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goto error;
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break;
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}
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GST_TRACE ("read number %u type %c", read, str[pos]);
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str += (pos + 1);
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posT -= (pos + 1);
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} while (posT > 0);
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}
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if (years == -1)
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years = 0;
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if (months == -1)
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months = 0;
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if (days == -1)
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days = 0;
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GST_TRACE ("Y:M:D=%d:%d:%d", years, months, days);
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/* read "T" for time (if present) */
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/* here T is at pos == 0 */
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str++;
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len--;
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pos = 0;
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if (pos < len) {
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/* T found, there is a time section */
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/* read hours, minutes, seconds, hundredths of second */
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do {
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GST_TRACE ("parsing substring %s", str);
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pos = strcspn (str, "HMS,.");
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ret = sscanf (str, "%u", &read);
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if (ret != 1) {
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GST_WARNING ("can not read integer value from string %s!", str);
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goto error;
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}
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switch (str[pos]) {
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case 'H':
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if (hours != -1 || minutes != -1 || seconds != -1) {
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GST_WARNING ("hour, minute or second was already set");
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goto error;
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}
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hours = read;
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if (hours >= 24) {
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GST_WARNING ("Hour out of range");
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goto error;
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}
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break;
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case 'M':
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if (minutes != -1 || seconds != -1) {
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GST_WARNING ("minute or second was already set");
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goto error;
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}
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minutes = read;
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if (minutes >= 60) {
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GST_WARNING ("Minute out of range");
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goto error;
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}
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break;
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case 'S':
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if (have_ms) {
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/* we have read the decimal part of the seconds */
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decimals = convert_to_millisecs (read, pos);
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GST_TRACE ("decimal number %u (%d digits) -> %d ms", read, pos,
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decimals);
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} else {
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if (seconds != -1) {
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GST_WARNING ("second was already set");
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goto error;
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}
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/* no decimals */
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seconds = read;
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}
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break;
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case '.':
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case ',':
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/* we have read the integer part of a decimal number in seconds */
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if (seconds != -1) {
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GST_WARNING ("second was already set");
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goto error;
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}
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seconds = read;
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have_ms = TRUE;
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break;
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default:
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GST_WARNING ("unexpected char %c!", str[pos]);
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goto error;
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break;
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}
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GST_TRACE ("read number %u type %c", read, str[pos]);
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str += pos + 1;
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len -= (pos + 1);
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} while (len > 0);
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}
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if (hours == -1)
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hours = 0;
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if (minutes == -1)
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minutes = 0;
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if (seconds == -1)
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seconds = 0;
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if (decimals == -1)
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decimals = 0;
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GST_TRACE ("H:M:S.MS=%d:%d:%d.%03d", hours, minutes, seconds, decimals);
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tmp_value = 0;
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if (!accumulate (&tmp_value, 1, years)
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|| !accumulate (&tmp_value, 365, months * 30)
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|| !accumulate (&tmp_value, 1, days)
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|| !accumulate (&tmp_value, 24, hours)
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|| !accumulate (&tmp_value, 60, minutes)
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|| !accumulate (&tmp_value, 60, seconds)
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|| !accumulate (&tmp_value, 1000, decimals))
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goto error;
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/* ensure it can be converted from milliseconds to nanoseconds */
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if (tmp_value > G_MAXUINT64 / 1000000)
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goto error;
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*value = tmp_value;
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return TRUE;
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error:
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return FALSE;
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}
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static gboolean
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gst_mpdparser_get_xml_prop_duration (xmlNode * a_node,
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const gchar * property_name, guint64 default_value,
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@ -946,171 +1161,18 @@ gst_mpdparser_get_xml_prop_duration (xmlNode * a_node,
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{
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xmlChar *prop_string;
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gchar *str;
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gint ret, len, pos, posT;
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gint years = -1, months = -1, days = -1, hours = -1, minutes = -1, seconds =
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-1, decimals = -1, read;
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gboolean have_ms = FALSE;
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gboolean exists = FALSE;
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*property_value = default_value;
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prop_string = xmlGetProp (a_node, (const xmlChar *) property_name);
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if (prop_string) {
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len = xmlStrlen (prop_string);
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str = (gchar *) prop_string;
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GST_TRACE ("duration: %s, len %d", str, len);
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if (strchr (str, '-') != NULL) {
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GST_WARNING ("'-' sign found while parsing unsigned duration");
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if (!gst_mpdparser_parse_duration (str, property_value))
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goto error;
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}
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/* read "P" for period */
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pos = strcspn (str, "P");
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if (pos != 0) {
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GST_WARNING ("P not found at the beginning of the string!");
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goto error;
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}
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str++;
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len--;
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/* read "T" for time (if present) */
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posT = strcspn (str, "T");
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len -= posT;
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if (posT > 0) {
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/* there is some room between P and T, so there must be a period section */
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/* read years, months, days */
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do {
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GST_TRACE ("parsing substring %s", str);
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pos = strcspn (str, "YMD");
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ret = sscanf (str, "%u", &read);
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if (ret != 1) {
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GST_WARNING ("can not read integer value from string %s!", str);
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goto error;
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}
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switch (str[pos]) {
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case 'Y':
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if (years != -1 || months != -1 || days != -1) {
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GST_WARNING ("year, month or day was already set");
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goto error;
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}
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years = read;
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break;
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case 'M':
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if (months != -1 || days != -1) {
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GST_WARNING ("month or day was already set");
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goto error;
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}
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months = read;
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break;
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case 'D':
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if (days != -1) {
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GST_WARNING ("day was already set");
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goto error;
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}
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days = read;
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break;
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default:
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GST_WARNING ("unexpected char %c!", str[pos]);
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goto error;
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break;
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}
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GST_TRACE ("read number %u type %c", read, str[pos]);
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str += (pos + 1);
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posT -= (pos + 1);
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} while (posT > 0);
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}
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if (years == -1)
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years = 0;
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if (months == -1)
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months = 0;
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if (days == -1)
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days = 0;
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GST_TRACE ("Y:M:D=%d:%d:%d", years, months, days);
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/* read "T" for time (if present) */
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/* here T is at pos == 0 */
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str++;
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len--;
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pos = 0;
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if (pos < len) {
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/* T found, there is a time section */
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/* read hours, minutes, seconds, cents of second */
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do {
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GST_TRACE ("parsing substring %s", str);
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pos = strcspn (str, "HMS,.");
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ret = sscanf (str, "%u", &read);
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if (ret != 1) {
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GST_WARNING ("can not read integer value from string %s!", str);
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goto error;
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}
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switch (str[pos]) {
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case 'H':
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if (hours != -1 || minutes != -1 || seconds != -1) {
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GST_WARNING ("hour, minute or second was already set");
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goto error;
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}
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hours = read;
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break;
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case 'M':
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if (minutes != -1 || seconds != -1) {
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GST_WARNING ("minute or second was already set");
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goto error;
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}
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minutes = read;
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break;
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case 'S':
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if (have_ms) {
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/* we have read the decimal part of the seconds */
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decimals = convert_to_millisecs (read, pos);
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GST_TRACE ("decimal number %u (%d digits) -> %d ms", read, pos,
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decimals);
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} else {
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if (seconds != -1) {
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GST_WARNING ("second was already set");
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goto error;
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}
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/* no decimals */
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seconds = read;
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}
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break;
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case '.':
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case ',':
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/* we have read the integer part of a decimal number in seconds */
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if (seconds != -1) {
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GST_WARNING ("second was already set");
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goto error;
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}
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seconds = read;
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have_ms = TRUE;
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break;
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default:
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GST_WARNING ("unexpected char %c!", str[pos]);
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goto error;
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break;
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}
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GST_TRACE ("read number %u type %c", read, str[pos]);
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str += pos + 1;
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len -= (pos + 1);
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} while (len > 0);
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}
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if (hours == -1)
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hours = 0;
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if (minutes == -1)
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minutes = 0;
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if (seconds == -1)
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seconds = 0;
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if (decimals == -1)
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decimals = 0;
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GST_TRACE ("H:M:S.MS=%d:%d:%d.%03d", hours, minutes, seconds, decimals);
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GST_LOG (" - %s: %" G_GUINT64_FORMAT, property_name, *property_value);
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xmlFree (prop_string);
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exists = TRUE;
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*property_value =
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(((((guint64) years * 365 + months * 30 + days) * 24 +
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hours) * 60 + minutes) * 60 + seconds) * 1000 + decimals;
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GST_LOG (" - %s: %" G_GUINT64_FORMAT, property_name, *property_value);
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}
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return exists;
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error:
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