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/*
* nghttp3
*
* Copyright (c) 2019 nghttp3 contributors
* 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 NGHTTP3_IDTR_H
#define NGHTTP3_IDTR_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* defined(HAVE_CONFIG_H) */
#include <nghttp3/nghttp3.h>
#include "nghttp3_mem.h"
#include "nghttp3_gaptr.h"
/*
* nghttp3_idtr tracks the usage of stream ID.
*/
typedef struct nghttp3_idtr {
/* gap maintains the range of an internal ID which is not used yet.
Initially, its range is [0, UINT64_MAX). The internal ID and
stream ID are in the different number spaces. See
id_from_stream_id to convert a stream ID to an internal ID. */
nghttp3_gaptr gap;
} nghttp3_idtr;
/*
* nghttp3_idtr_init initializes |idtr|.
*/
void nghttp3_idtr_init(nghttp3_idtr *idtr, const nghttp3_mem *mem);
/*
* nghttp3_idtr_free frees resources allocated for |idtr|.
*/
void nghttp3_idtr_free(nghttp3_idtr *idtr);
/*
* nghttp3_idtr_open claims that |stream_id| is in use.
*
* It returns 0 if it succeeds, or one of the following negative error
* codes:
*
* NGHTTP3_ERR_STREAM_IN_USE
* |stream_id| has already been used.
* NGHTTP3_ERR_NOMEM
* Out of memory.
*/
int nghttp3_idtr_open(nghttp3_idtr *idtr, int64_t stream_id);
/*
* nghttp3_idtr_open returns nonzero if |stream_id| is in use.
*/
int nghttp3_idtr_is_open(nghttp3_idtr *idtr, int64_t stream_id);
#endif /* !defined(NGHTTP3_IDTR_H) */
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