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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_GAPTR_H
#define NGTCP2_GAPTR_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* defined(HAVE_CONFIG_H) */
#include <ngtcp2/ngtcp2.h>
#include "ngtcp2_mem.h"
#include "ngtcp2_ksl.h"
#include "ngtcp2_range.h"
/*
* ngtcp2_gaptr maintains the gap in the range [0, UINT64_MAX).
*/
typedef struct ngtcp2_gaptr {
/* gap maintains the range of offset which is not pushed
yet. Initially, its range is [0, UINT64_MAX). "gap" is the range
that is not pushed yet. */
ngtcp2_ksl gap;
/* mem is custom memory allocator */
const ngtcp2_mem *mem;
} ngtcp2_gaptr;
/*
* ngtcp2_gaptr_init initializes |gaptr|.
*/
void ngtcp2_gaptr_init(ngtcp2_gaptr *gaptr, const ngtcp2_mem *mem);
/*
* ngtcp2_gaptr_free frees resources allocated for |gaptr|.
*/
void ngtcp2_gaptr_free(ngtcp2_gaptr *gaptr);
/*
* ngtcp2_gaptr_push pushes the range [offset, offset + datalen).
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGTCP2_ERR_NOMEM
* Out of memory
*/
int ngtcp2_gaptr_push(ngtcp2_gaptr *gaptr, uint64_t offset, uint64_t datalen);
/*
* ngtcp2_gaptr_first_gap_offset returns the offset to the first gap.
* If there is no gap, it returns UINT64_MAX.
*/
uint64_t ngtcp2_gaptr_first_gap_offset(const ngtcp2_gaptr *gaptr);
/*
* ngtcp2_gaptr_get_first_gap_after returns the first gap which
* includes or comes after |offset|.
*/
ngtcp2_range ngtcp2_gaptr_get_first_gap_after(const ngtcp2_gaptr *gaptr,
uint64_t offset);
/*
* ngtcp2_gaptr_is_pushed returns nonzero if range [offset, offset +
* datalen) is completely pushed into this object.
*/
int ngtcp2_gaptr_is_pushed(const ngtcp2_gaptr *gaptr, uint64_t offset,
uint64_t datalen);
/*
* ngtcp2_gaptr_drop_first_gap deletes the first gap entirely as if
* the range is pushed. This function assumes that at least one gap
* exists.
*/
void ngtcp2_gaptr_drop_first_gap(ngtcp2_gaptr *gaptr);
#endif /* !defined(NGTCP2_GAPTR_H) */
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