1 files changed, 133 insertions, 0 deletions
diff --git a/lib/ringbuf.h b/lib/ringbuf.h
new file mode 100644
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--- /dev/null
+++ b/lib/ringbuf.h
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+/*
+ * Circular buffer implementation.
+ * Copyright (C) 2017 Cumulus Networks
+ * Quentin Young
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program 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 General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#ifndef _FRR_RINGBUF_H_
+#define _FRR_RINGBUF_H_
+
+#include <zebra.h>
+#include <stdint.h>
+
+#include "memory.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct ringbuf {
+	size_t size;
+	ssize_t start;
+	ssize_t end;
+	bool empty;
+	uint8_t *data;
+};
+
+/*
+ * Creates a new ring buffer.
+ *
+ * @param size	buffer size, in bytes
+ * @return the newly created buffer
+ */
+struct ringbuf *ringbuf_new(size_t size);
+
+/*
+ * Deletes a ring buffer and frees all associated resources.
+ *
+ * @param buf	the ring buffer to destroy
+ */
+void ringbuf_del(struct ringbuf *buf);
+
+/*
+ * Get amount of data left to read from the buffer.
+ *
+ * @return number of readable bytes
+ */
+size_t ringbuf_remain(struct ringbuf *buf);
+
+/*
+ * Get amount of space left to write to the buffer
+ *
+ * @return number of writeable bytes
+ */
+size_t ringbuf_space(struct ringbuf *buf);
+
+
+/*
+ * Put data into the ring buffer.
+ *
+ * @param data	the data to put in the buffer
+ * @param size	how much of data to put in
+ * @return number of bytes written; will be less than size if there was not
+ * enough space
+ */
+size_t ringbuf_put(struct ringbuf *buf, const void *data, size_t size);
+
+/*
+ * Get data from the ring buffer.
+ *
+ * @param data	where to put the data
+ * @param size	how much of data to get
+ * @return number of bytes read into data; will be less than size if there was
+ * not enough data to read
+ */
+size_t ringbuf_get(struct ringbuf *buf, void *data, size_t size);
+
+/*
+ * Peek data from the ring buffer.
+ *
+ * @param offset	where to get the data from, in bytes offset from the
+ *			start of the data
+ * @param data		where to put the data
+ * @param size		how much data to get
+ * @return		number of bytes read into data; will be less than size
+ *			if there was not enough data to read; will be -1 if the
+ *			offset exceeds the amount of data left in the ring
+ *			buffer
+ */
+size_t ringbuf_peek(struct ringbuf *buf, size_t offset, void *data,
+		    size_t size);
+
+/*
+ * Copy data from one ringbuf to another.
+ *
+ * @param to	destination ringbuf
+ * @param from	source ringbuf
+ * @param size	how much data to copy
+ * @return amount of data copied
+ */
+size_t ringbuf_copy(struct ringbuf *to, struct ringbuf *from, size_t size);
+
+/*
+ * Reset buffer. Does not wipe.
+ *
+ * @param buf
+ */
+void ringbuf_reset(struct ringbuf *buf);
+
+/*
+ * Reset buffer. Wipes.
+ *
+ * @param buf
+ */
+void ringbuf_wipe(struct ringbuf *buf);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _FRR_RINGBUF_H_ */