1 files changed, 129 insertions, 0 deletions
diff --git a/lib/libucsi/descriptor.h b/lib/libucsi/descriptor.h
new file mode 100644
index 0000000..606e45d
--- /dev/null
+++ b/lib/libucsi/descriptor.h
@@ -0,0 +1,129 @@
+/*
+ * section and descriptor parser
+ *
+ * Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org)
+ *
+ * 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
+ */
+
+#ifndef _UCSI_DESCRIPTOR_H
+#define _UCSI_DESCRIPTOR_H 1
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include <libucsi/endianops.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+/**
+ * Generic descriptor header.
+ */
+struct descriptor {
+	uint8_t tag;
+	uint8_t len;
+} __ucsi_packed;
+
+/**
+ * Retreive pointer to the next descriptor structure.
+ *
+ * @param buf The buffer of descriptors.
+ * @param len Size of the buffer.
+ * @param pos Current descriptor.
+ * @return Pointer to next descriptor, or NULL if there are none.
+ */
+static inline struct descriptor *
+	next_descriptor(uint8_t * buf, size_t len, struct descriptor * pos)
+{
+	uint8_t* next;
+
+	if (pos == NULL)
+		return NULL;
+
+	next = (uint8_t*) pos + 2 + pos->len;
+	if (next >= buf + len)
+		return NULL;
+
+	return (struct descriptor *) next;
+}
+
+
+/**
+ * The unknown descriptor.
+ */
+struct unknown_descriptor {
+	struct descriptor d;
+
+	/* uint8_t data [] */
+} __ucsi_packed;
+
+/**
+ * Retrieve pointer to the unknown descriptor's data field.
+ *
+ * @param d The descriptor.
+ * @return Pointer to the data field.
+ */
+static inline uint8_t *
+	unknown_descriptor_data(struct unknown_descriptor *d)
+{
+	return (uint8_t *) d + sizeof(struct unknown_descriptor);
+}
+
+/**
+ * Retrieve size of unknown descriptor's data field.
+ *
+ * @param d The descriptor.
+ * @return Size of data field in bytes.
+ */
+static inline int
+	unknown_descriptor_data_size(struct unknown_descriptor *d)
+{
+	return d->d.len;
+}
+
+
+
+
+
+
+
+
+
+
+/******************************** PRIVATE CODE ********************************/
+static inline int verify_descriptors(uint8_t * buf, size_t len)
+{
+	size_t pos = 0;
+
+	while (pos < len) {
+		if ((pos + 2) > len)
+			return -1;
+
+		pos += 2 + buf[pos+1];
+	}
+
+	if (pos != len)
+		return -1;
+
+	return 0;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif