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/*
* ngtcp2
*
* Copyright (c) 2017 ngtcp2 contributors
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef NGTCP2_IDTR_H
#define NGTCP2_IDTR_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <ngtcp2/ngtcp2.h>
#include "ngtcp2_mem.h"
#include "ngtcp2_gaptr.h"
/*
* ngtcp2_idtr tracks the usage of stream ID.
*/
typedef struct ngtcp2_idtr {
/* gap maintains the range of ID which is not used yet. Initially,
its range is [0, UINT64_MAX). */
ngtcp2_gaptr gap;
/* server is nonzero if this object records server initiated stream
ID. */
int server;
} ngtcp2_idtr;
/*
* ngtcp2_idtr_init initializes |idtr|.
*
* If this object records server initiated ID (even number), set
* |server| to nonzero.
*/
void ngtcp2_idtr_init(ngtcp2_idtr *idtr, int server, const ngtcp2_mem *mem);
/*
* ngtcp2_idtr_free frees resources allocated for |idtr|.
*/
void ngtcp2_idtr_free(ngtcp2_idtr *idtr);
/*
* ngtcp2_idtr_open claims that |stream_id| is in used.
*
* It returns 0 if it succeeds, or one of the following negative error
* codes:
*
* NGTCP2_ERR_STREAM_IN_USE
* ID has already been used.
* NGTCP2_ERR_NOMEM
* Out of memory.
*/
int ngtcp2_idtr_open(ngtcp2_idtr *idtr, int64_t stream_id);
/*
* ngtcp2_idtr_open tells whether ID |stream_id| is in used or not.
*
* It returns nonzero if |stream_id| is used.
*/
int ngtcp2_idtr_is_open(ngtcp2_idtr *idtr, int64_t stream_id);
/*
* ngtcp2_idtr_first_gap returns the first id of first gap. If there
* is no gap, it returns UINT64_MAX. The returned id is an id space
* used in this object internally, and not stream ID.
*/
uint64_t ngtcp2_idtr_first_gap(ngtcp2_idtr *idtr);
#endif /* NGTCP2_IDTR_H */
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