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/*
* ngtcp2
*
* Copyright (c) 2022 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_BALLOC_H
#define NGTCP2_BALLOC_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <ngtcp2/ngtcp2.h>
#include "ngtcp2_buf.h"
typedef struct ngtcp2_memblock_hd ngtcp2_memblock_hd;
/*
* ngtcp2_memblock_hd is the header of memory block.
*/
struct ngtcp2_memblock_hd {
ngtcp2_memblock_hd *next;
};
/*
* ngtcp2_balloc is a custom memory allocator. It allocates |blklen|
* bytes of memory at once on demand, and returns its slice when the
* allocation is requested.
*/
typedef struct ngtcp2_balloc {
/* mem is the underlying memory allocator. */
const ngtcp2_mem *mem;
/* blklen is the size of memory block. */
size_t blklen;
/* head points to the list of memory block allocated so far. */
ngtcp2_memblock_hd *head;
/* buf wraps the current memory block for allocation requests. */
ngtcp2_buf buf;
} ngtcp2_balloc;
/*
* ngtcp2_balloc_init initializes |balloc| with |blklen| which is the
* size of memory block.
*/
void ngtcp2_balloc_init(ngtcp2_balloc *balloc, size_t blklen,
const ngtcp2_mem *mem);
/*
* ngtcp2_balloc_free releases all allocated memory blocks.
*/
void ngtcp2_balloc_free(ngtcp2_balloc *balloc);
/*
* ngtcp2_balloc_get allocates |n| bytes of memory and assigns its
* pointer to |*pbuf|.
*
* It returns 0 if it succeeds, or one of the following negative error
* codes:
*
* NGTCP2_ERR_NOMEM
* Out of memory.
*/
int ngtcp2_balloc_get(ngtcp2_balloc *balloc, void **pbuf, size_t n);
/*
* ngtcp2_balloc_clear releases all allocated memory blocks and
* initializes its state.
*/
void ngtcp2_balloc_clear(ngtcp2_balloc *balloc);
#endif /* NGTCP2_BALLOC_H */
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