1 files changed, 76 insertions, 0 deletions
diff --git a/lib/libucsi/atsc/mgt_section.c b/lib/libucsi/atsc/mgt_section.c
new file mode 100644
index 0000000..bc6b3f2
--- /dev/null
+++ b/lib/libucsi/atsc/mgt_section.c
@@ -0,0 +1,76 @@
+/*
+ * section and descriptor parser
+ *
+ * Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org)
+ * Copyright (C) 2005 Andrew de Quincey (adq_dvb@lidskialf.net)
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#include <libucsi/atsc/mgt_section.h>
+
+struct atsc_mgt_section *atsc_mgt_section_codec(struct atsc_section_psip *psip)
+{
+	uint8_t * buf = (uint8_t *) psip;
+	size_t pos = sizeof(struct atsc_section_psip);
+	size_t len = section_ext_length(&(psip->ext_head));
+	struct atsc_mgt_section *mgt = (struct atsc_mgt_section *) psip;
+	int i;
+
+	if (len < sizeof(struct atsc_mgt_section))
+		return NULL;
+
+	bswap16(buf + pos);
+	pos += 2;
+
+	// we cannot use the tables_defined value here because of the braindead ATSC spec!
+	for(i=0; i < mgt->tables_defined; i++) {
+		// we think we're still in the tables - process as normal
+		if ((pos + sizeof(struct atsc_mgt_table)) > len)
+			return NULL;
+		struct atsc_mgt_table *table = (struct atsc_mgt_table *) (buf+pos);
+
+		bswap16(buf+pos);
+		bswap16(buf+pos+2);
+		bswap32(buf+pos+5);
+		bswap16(buf+pos+9);
+
+		pos += sizeof(struct atsc_mgt_table);
+		if ((pos + table->table_type_descriptors_length) > len)
+			return NULL;
+		if (verify_descriptors(buf + pos, table->table_type_descriptors_length))
+			return NULL;
+
+		pos += table->table_type_descriptors_length;
+	}
+
+	if ((pos + sizeof(struct atsc_mgt_section_part2)) > len)
+		return NULL;
+	struct atsc_mgt_section_part2 *part2 = (struct atsc_mgt_section_part2 *) (buf+pos);
+
+	bswap16(buf+pos);
+
+	pos += sizeof(struct atsc_mgt_section_part2);
+	if ((pos + part2->descriptors_length) > len)
+		return NULL;
+	if (verify_descriptors(buf + pos, part2->descriptors_length))
+		return NULL;
+	pos += part2->descriptors_length;
+
+	if (pos != len)
+		return NULL;
+
+	return (struct atsc_mgt_section *) psip;
+}