/*

 * nghttp2 - HTTP/2 C Library

 *

 * Copyright (c) 2016 Tatsuhiro Tsujikawa

 *

 * 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 "nghttp2_rcbuf.h"

#include <string.h>

#include <assert.h>

#include "nghttp2_mem.h"

#include "nghttp2_helper.h"

int nghttp2_rcbuf_new(nghttp2_rcbuf **rcbuf_ptr, size_t size,

                      nghttp2_mem *mem) {

  uint8_t *p;

  p = nghttp2_mem_malloc(mem, sizeof(nghttp2_rcbuf) + size);

  if (p == NULL) {

    return NGHTTP2_ERR_NOMEM;

  }

  *rcbuf_ptr = (void *)p;

  **rcbuf_ptr = (nghttp2_rcbuf){

    .mem_user_data = mem->mem_user_data,

    .free = mem->free,

    .base = p + sizeof(nghttp2_rcbuf),

    .len = size,

    .ref = 1,

  };

  return 0;

}

int nghttp2_rcbuf_new2(nghttp2_rcbuf **rcbuf_ptr, const uint8_t *src,

                       size_t srclen, nghttp2_mem *mem) {

  int rv;

  rv = nghttp2_rcbuf_new(rcbuf_ptr, srclen + 1, mem);

  if (rv != 0) {

    return rv;

  }

  (*rcbuf_ptr)->len = srclen;

  *nghttp2_cpymem((*rcbuf_ptr)->base, src, srclen) = '\0';

  return 0;

}

/*

 * Frees |rcbuf| itself, regardless of its reference cout.

 */

void nghttp2_rcbuf_del(nghttp2_rcbuf *rcbuf) {

  nghttp2_mem_free2(rcbuf->free, rcbuf, rcbuf->mem_user_data);

}

void nghttp2_rcbuf_incref(nghttp2_rcbuf *rcbuf) {

  if (rcbuf->ref == -1) {

    return;

  }

  ++rcbuf->ref;

}

void nghttp2_rcbuf_decref(nghttp2_rcbuf *rcbuf) {

  if (rcbuf == NULL || rcbuf->ref == -1) {

    return;

  }

  assert(rcbuf->ref > 0);

  if (--rcbuf->ref == 0) {

    nghttp2_rcbuf_del(rcbuf);

  }

}

nghttp2_vec nghttp2_rcbuf_get_buf(nghttp2_rcbuf *rcbuf) {

  nghttp2_vec res = {rcbuf->base, rcbuf->len};

  return res;

}

int nghttp2_rcbuf_is_static(const nghttp2_rcbuf *rcbuf) {

  return rcbuf->ref == -1;

}