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2022-05-31 12:35:46 -04:00
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+/**
+  * Copyright 2011 Bump Technologies, Inc. All rights reserved.
+  *
+  * Redistribution and use in source and binary forms, with or without modification, are
+  * permitted provided that the following conditions are met:
+  *
+  *    1. Redistributions of source code must retain the above copyright notice, this list of
+  *       conditions and the following disclaimer.
+  *
+  *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+  *       of conditions and the following disclaimer in the documentation and/or other materials
+  *       provided with the distribution.
+  *
+  * THIS SOFTWARE IS PROVIDED BY BUMP TECHNOLOGIES, INC. ``AS IS'' AND ANY EXPRESS OR IMPLIED
+  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+  * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BUMP TECHNOLOGIES, INC. OR
+  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  * The views and conclusions contained in the software and documentation are those of the
+  * authors and should not be interpreted as representing official policies, either expressed
+  * or implied, of Bump Technologies, Inc.
+  *
+  **/
+
+#ifndef RINGBUFFER_H
+#define RINGBUFFER_H
+
+#include <stddef.h>
+
+/* Tweak these for potential memory/throughput tradeoffs */
+#define RING_SLOTS 3
+#define RING_DATA_LEN 1024 * 32
+
+typedef struct bufent {
+    char data[RING_DATA_LEN];
+    char *ptr;
+    size_t left;
+    struct bufent *next;
+} bufent;
+
+typedef struct ringbuffer {
+    bufent slots[RING_SLOTS];
+    bufent *head; // reads from the head
+    bufent *tail; // writes to the tail
+    size_t used;
+} ringbuffer;
+
+void ringbuffer_init(ringbuffer *rb);
+
+char * ringbuffer_read_next(ringbuffer *rb, int * length);
+void ringbuffer_read_skip(ringbuffer *rb, int length);
+void ringbuffer_read_pop(ringbuffer *rb);
+
+char * ringbuffer_write_ptr(ringbuffer *rb);
+void ringbuffer_write_append(ringbuffer *rb, int length);
+
+int ringbuffer_size(ringbuffer *rb);
+int ringbuffer_capacity(ringbuffer *rb);
+int ringbuffer_is_empty(ringbuffer *rb);
+int ringbuffer_is_full(ringbuffer *rb);
+
+#endif /* RINGBUFFER_H */