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134 lines
3.6 KiB
C
134 lines
3.6 KiB
C
/*
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* Circular buffer implementation.
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* Copyright (C) 2017 Cumulus Networks
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* Quentin Young
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <zebra.h>
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#include "ringbuf.h"
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#include "memory.h"
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DEFINE_MTYPE_STATIC(LIB, RINGBUFFER, "Ring buffer")
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struct ringbuf *ringbuf_new(size_t size)
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{
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struct ringbuf *buf = XCALLOC(MTYPE_RINGBUFFER, sizeof(struct ringbuf));
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buf->data = XCALLOC(MTYPE_RINGBUFFER, size);
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buf->size = size;
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buf->empty = true;
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return buf;
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}
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void ringbuf_del(struct ringbuf *buf)
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{
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XFREE(MTYPE_RINGBUFFER, buf->data);
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XFREE(MTYPE_RINGBUFFER, buf);
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}
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size_t ringbuf_remain(struct ringbuf *buf)
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{
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ssize_t diff = buf->end - buf->start;
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diff += ((diff == 0) && !buf->empty) ? buf->size : 0;
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diff += (diff < 0) ? buf->size : 0;
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return (size_t)diff;
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}
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size_t ringbuf_space(struct ringbuf *buf)
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{
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return buf->size - ringbuf_remain(buf);
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}
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size_t ringbuf_put(struct ringbuf *buf, const void *data, size_t size)
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{
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const uint8_t *dp = data;
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size_t space = ringbuf_space(buf);
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size_t copysize = MIN(size, space);
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size_t tocopy = copysize;
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if (tocopy >= buf->size - buf->end) {
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size_t ts = buf->size - buf->end;
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memcpy(buf->data + buf->end, dp, ts);
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buf->end = 0;
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tocopy -= ts;
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dp += ts;
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}
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memcpy(buf->data + buf->end, dp, tocopy);
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buf->end += tocopy;
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buf->empty = (buf->start == buf->end) && (buf->empty && !copysize);
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return copysize;
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}
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size_t ringbuf_get(struct ringbuf *buf, void *data, size_t size)
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{
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uint8_t *dp = data;
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size_t remain = ringbuf_remain(buf);
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size_t copysize = MIN(remain, size);
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size_t tocopy = copysize;
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if (tocopy >= buf->size - buf->start) {
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size_t ts = buf->size - buf->start;
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memcpy(dp, buf->data + buf->start, ts);
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buf->start = 0;
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tocopy -= ts;
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dp += ts;
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}
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memcpy(dp, buf->data + buf->start, tocopy);
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buf->start = buf->start + tocopy;
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buf->empty = (buf->start == buf->end) && (buf->empty || copysize);
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return copysize;
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}
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size_t ringbuf_peek(struct ringbuf *buf, size_t offset, void *data, size_t size)
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{
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uint8_t *dp = data;
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size_t remain = ringbuf_remain(buf);
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if (offset >= remain)
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return 0;
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size_t copysize = MAX(MIN(remain - offset, size), (size_t)0);
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size_t tocopy = copysize;
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size_t cstart = (buf->start + offset) % buf->size;
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if (tocopy >= buf->size - cstart) {
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size_t ts = buf->size - cstart;
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memcpy(dp, buf->data + cstart, ts);
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cstart = 0;
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tocopy -= ts;
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dp += ts;
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}
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memcpy(dp, buf->data + cstart, tocopy);
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return copysize;
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}
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size_t ringbuf_copy(struct ringbuf *to, struct ringbuf *from, size_t size)
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{
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size_t tocopy = MIN(ringbuf_space(to), size);
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uint8_t *cbuf = XCALLOC(MTYPE_TMP, tocopy);
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tocopy = ringbuf_peek(from, 0, cbuf, tocopy);
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size_t put = ringbuf_put(to, cbuf, tocopy);
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XFREE(MTYPE_TMP, cbuf);
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return put;
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}
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void ringbuf_reset(struct ringbuf *buf)
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{
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buf->start = buf->end = 0;
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buf->empty = true;
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}
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void ringbuf_wipe(struct ringbuf *buf)
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{
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memset(buf->data, 0x00, buf->size);
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ringbuf_reset(buf);
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}
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