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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.
*/
#include "ngtcp2_balloc.h"
#include <assert.h>
#include "ngtcp2_mem.h"
void ngtcp2_balloc_init(ngtcp2_balloc *balloc, size_t blklen,
const ngtcp2_mem *mem) {
assert((blklen & 0xfu) == 0);
balloc->mem = mem;
balloc->blklen = blklen;
balloc->head = NULL;
ngtcp2_buf_init(&balloc->buf, (void *)"", 0);
}
void ngtcp2_balloc_free(ngtcp2_balloc *balloc) {
if (balloc == NULL) {
return;
}
ngtcp2_balloc_clear(balloc);
}
void ngtcp2_balloc_clear(ngtcp2_balloc *balloc) {
ngtcp2_memblock_hd *p, *next;
for (p = balloc->head; p; p = next) {
next = p->next;
ngtcp2_mem_free(balloc->mem, p);
}
balloc->head = NULL;
ngtcp2_buf_init(&balloc->buf, (void *)"", 0);
}
int ngtcp2_balloc_get(ngtcp2_balloc *balloc, void **pbuf, size_t n) {
uint8_t *p;
ngtcp2_memblock_hd *hd;
assert(n <= balloc->blklen);
if (ngtcp2_buf_left(&balloc->buf) < n) {
p = ngtcp2_mem_malloc(balloc->mem,
sizeof(ngtcp2_memblock_hd) + 0x10u + balloc->blklen);
if (p == NULL) {
return NGTCP2_ERR_NOMEM;
}
hd = (ngtcp2_memblock_hd *)(void *)p;
hd->next = balloc->head;
balloc->head = hd;
ngtcp2_buf_init(
&balloc->buf,
(uint8_t *)(((uintptr_t)p + sizeof(ngtcp2_memblock_hd) + 0xfu) &
~(uintptr_t)0xfu),
balloc->blklen);
}
assert(((uintptr_t)balloc->buf.last & 0xfu) == 0);
*pbuf = balloc->buf.last;
balloc->buf.last += (n + 0xfu) & ~(uintptr_t)0xfu;
return 0;
}
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