/*
 * 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_range.h"
#include "ngtcp2_macro.h"

void ngtcp2_range_init(ngtcp2_range *r, uint64_t begin, uint64_t end) {
  *r = (ngtcp2_range){
    .begin = begin,
    .end = end,
  };
}

ngtcp2_range ngtcp2_range_intersect(const ngtcp2_range *a,
                                    const ngtcp2_range *b) {
  ngtcp2_range r;
  uint64_t begin = ngtcp2_max_uint64(a->begin, b->begin);
  uint64_t end = ngtcp2_min_uint64(a->end, b->end);

  if (begin < end) {
    ngtcp2_range_init(&r, begin, end);
  } else {
    r = (ngtcp2_range){0};
  }

  return r;
}

uint64_t ngtcp2_range_len(const ngtcp2_range *r) { return r->end - r->begin; }

int ngtcp2_range_eq(const ngtcp2_range *a, const ngtcp2_range *b) {
  return a->begin == b->begin && a->end == b->end;
}

void ngtcp2_range_cut(ngtcp2_range *left, ngtcp2_range *right,
                      const ngtcp2_range *a, const ngtcp2_range *b) {
  /* Assume that b is included in a */
  *left = (ngtcp2_range){
    .begin = a->begin,
    .end = b->begin,
  };
  *right = (ngtcp2_range){
    .begin = b->end,
    .end = a->end,
  };
}

int ngtcp2_range_not_after(const ngtcp2_range *a, const ngtcp2_range *b) {
  return a->end <= b->end;
}
