1 files changed, 52 insertions, 0 deletions
diff --git a/src/shared/shl-ring.h b/src/shared/shl-ring.h
new file mode 100644
index 0000000..c98f084
--- /dev/null
+++ b/src/shared/shl-ring.h
@@ -0,0 +1,52 @@
+/*
+ * SHL - Ring buffer
+ *
+ * Copyright (c) 2011-2014 David Herrmann <dh.herrmann@gmail.com>
+ * Dedicated to the Public Domain
+ */
+
+/*
+ * Ring buffer
+ */
+
+#ifndef SHL_RING_H
+#define SHL_RING_H
+
+#include <errno.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/uio.h>
+
+struct shl_ring {
+	uint8_t *buf;		/* buffer or NULL */
+	size_t size;		/* actual size of @buf */
+	size_t start;		/* start position of ring */
+	size_t used;		/* number of actually used bytes */
+};
+
+/* flush buffer so it is empty again */
+void shl_ring_flush(struct shl_ring *r);
+
+/* flush buffer, free allocated data and reset to initial state */
+void shl_ring_clear(struct shl_ring *r);
+
+/* get pointers to buffer data and their length */
+size_t shl_ring_peek(struct shl_ring *r, struct iovec *vec);
+
+/* copy data into external linear buffer */
+size_t shl_ring_copy(struct shl_ring *r, void *buf, size_t size);
+
+/* push data to the end of the buffer */
+int shl_ring_push(struct shl_ring *r, const void *u8, size_t size);
+
+/* pull data from the front of the buffer */
+void shl_ring_pull(struct shl_ring *r, size_t size);
+
+/* return size of occupied buffer in bytes */
+static inline size_t shl_ring_get_size(struct shl_ring *r)
+{
+	return r->used;
+}
+
+#endif  /* SHL_RING_H */