/*

 * 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.

 */

#include "ngtcp2_buf.h"

#include "ngtcp2_mem.h"

void ngtcp2_buf_init(ngtcp2_buf *buf, uint8_t *begin, size_t len) {

  *buf = (ngtcp2_buf){

    .begin = begin,

    .end = begin + len,

    .pos = begin,

    .last = begin,

  };

}

void ngtcp2_buf_reset(ngtcp2_buf *buf) { buf->pos = buf->last = buf->begin; }

size_t ngtcp2_buf_cap(const ngtcp2_buf *buf) {

  return (size_t)(buf->end - buf->begin);

}

void ngtcp2_buf_trunc(ngtcp2_buf *buf, size_t len) {

  if (ngtcp2_buf_len(buf) > len) {

    buf->last = buf->pos + len;

  }

}

int ngtcp2_buf_chain_new(ngtcp2_buf_chain **pbufchain, size_t len,

                         const ngtcp2_mem *mem) {

  *pbufchain = ngtcp2_mem_malloc(mem, sizeof(ngtcp2_buf_chain) + len);

  if (*pbufchain == NULL) {

    return NGTCP2_ERR_NOMEM;

  }

  (*pbufchain)->next = NULL;

  ngtcp2_buf_init(&(*pbufchain)->buf,

                  (uint8_t *)(*pbufchain) + sizeof(ngtcp2_buf_chain), len);

  return 0;

}

void ngtcp2_buf_chain_del(ngtcp2_buf_chain *bufchain, const ngtcp2_mem *mem) {

  ngtcp2_mem_free(mem, bufchain);

}