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The shl_ring helpers manage a dynamically-growing ring-buffer. We need that for the following RTSP stream parsers, so add them to src/shared/. Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
/*
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* SHL - Ring buffer
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*
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* Copyright (c) 2011-2013 David Herrmann <dh.herrmann@gmail.com>
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* Dedicated to the Public Domain
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*/
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/*
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* Ring buffer
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*/
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#ifndef SHL_RING_H
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#define SHL_RING_H
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#include <errno.h>
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#include <inttypes.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/uio.h>
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struct shl_ring {
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uint8_t *buf; /* buffer or NULL */
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size_t size; /* actual size of @buf */
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size_t start; /* start position of ring */
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size_t used; /* number of actually used bytes */
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};
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/* flush buffer so it is empty again */
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void shl_ring_flush(struct shl_ring *r);
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/* flush buffer, free allocated data and reset to initial state */
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void shl_ring_clear(struct shl_ring *r);
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/* get pointers to buffer data and their length */
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size_t shl_ring_peek(struct shl_ring *r, struct iovec *vec);
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/* copy data into external linear buffer */
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size_t shl_ring_copy(struct shl_ring *r, void *buf, size_t size);
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/* push data to the end of the buffer */
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int shl_ring_push(struct shl_ring *r, const void *u8, size_t size);
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/* pull data from the front of the buffer */
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void shl_ring_pull(struct shl_ring *r, size_t size);
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/* return size of occupied buffer in bytes */
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static inline size_t shl_ring_get_size(struct shl_ring *r)
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{
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return r->used;
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}
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#endif /* SHL_RING_H */
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