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/*
* include/haprox/cbuf.h
* This file contains definitions and prototypes for circular buffers.
* Inspired from Linux circular buffers (include/linux/circ_buf.h).
*
* Copyright 2021 HAProxy Technologies, Frederic Lecaille <flecaille@haproxy.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, version 2.1
* exclusively.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _HAPROXY_CBUF_H
#define _HAPROXY_CBUF_H
#ifdef USE_QUIC
#ifndef USE_OPENSSL
#error "Must define USE_OPENSSL"
#endif
#endif
#include <haproxy/atomic.h>
#include <haproxy/list.h>
#include <haproxy/cbuf-t.h>
struct cbuf *cbuf_new(unsigned char *buf, size_t sz);
void cbuf_free(struct cbuf *cbuf);
/* Amount of data between <rd> and <wr> */
#define CBUF_DATA(wr, rd, size) (((wr) - (rd)) & ((size) - 1))
/* Return the writer position in <cbuf>.
* To be used only by the writer!
*/
static inline unsigned char *cb_wr(struct cbuf *cbuf)
{
return cbuf->buf + cbuf->wr;
}
/* Reset the reader index.
* To be used by a reader!
*/
static inline void cb_rd_reset(struct cbuf *cbuf)
{
cbuf->rd = 0;
}
/* Reset the writer index.
* To be used by a writer!
*/
static inline void cb_wr_reset(struct cbuf *cbuf)
{
cbuf->wr = 0;
}
/* Increase <cbuf> circular buffer data by <count>.
* To be used by a writer!
*/
static inline void cb_add(struct cbuf *cbuf, size_t count)
{
cbuf->wr = (cbuf->wr + count) & (cbuf->sz - 1);
}
/* Return the reader position in <cbuf>.
* To be used only by the reader!
*/
static inline unsigned char *cb_rd(struct cbuf *cbuf)
{
return cbuf->buf + cbuf->rd;
}
/* Skip <count> byte in <cbuf> circular buffer.
* To be used by a reader!
*/
static inline void cb_del(struct cbuf *cbuf, size_t count)
{
cbuf->rd = (cbuf->rd + count) & (cbuf->sz - 1);
}
/* Return the amount of data left in <cbuf>.
* To be used only by the writer!
*/
static inline size_t cb_data(struct cbuf *cbuf)
{
size_t rd;
rd = HA_ATOMIC_LOAD(&cbuf->rd);
return CBUF_DATA(cbuf->wr, rd, cbuf->sz);
}
/* Return the amount of room left in <cbuf> minus 1 to distinguish
* the case where the buffer is full from the case where is is empty
* To be used only by the write!
*/
static inline size_t cb_room(struct cbuf *cbuf)
{
size_t rd;
rd = HA_ATOMIC_LOAD(&cbuf->rd);
return CBUF_DATA(rd, cbuf->wr + 1, cbuf->sz);
}
/* Return the amount of contiguous data left in <cbuf>.
* To be used only by the reader!
*/
static inline size_t cb_contig_data(struct cbuf *cbuf)
{
size_t end, n;
end = cbuf->sz - cbuf->rd;
n = (HA_ATOMIC_LOAD(&cbuf->wr) + end) & (cbuf->sz - 1);
return n < end ? n : end;
}
/* Return the amount of contiguous space left in <cbuf>.
* To be used only by the writer!
*/
static inline size_t cb_contig_space(struct cbuf *cbuf)
{
size_t end, n;
end = cbuf->sz - 1 - cbuf->wr;
n = (HA_ATOMIC_LOAD(&cbuf->rd) + end) & (cbuf->sz - 1);
return n <= end ? n : end + 1;
}
#endif /* _HAPROXY_CBUF_H */
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