/*
 * ngtcp2
 *
 * Copyright (c) 2018 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_vec_test.h"

#include <CUnit/CUnit.h>

#include "ngtcp2_vec.h"
#include "ngtcp2_test_helper.h"

void test_ngtcp2_vec_split(void) {
  uint8_t nulldata[1024];
  ngtcp2_vec a[16], b[16];
  size_t acnt, bcnt;
  ngtcp2_ssize nsplit;

  /* No split occurs */
  acnt = 1;
  a[0].len = 135;
  a[0].base = nulldata;

  bcnt = 0;
  b[0].len = 0;
  b[0].base = NULL;

  nsplit = ngtcp2_vec_split(a, &acnt, b, &bcnt, 135, 16);

  CU_ASSERT(0 == nsplit);
  CU_ASSERT(1 == acnt);
  CU_ASSERT(135 == a[0].len);
  CU_ASSERT(nulldata == a[0].base);
  CU_ASSERT(0 == bcnt);
  CU_ASSERT(0 == b[0].len);
  CU_ASSERT(NULL == b[0].base);

  /* Split once */
  acnt = 1;
  a[0].len = 135;
  a[0].base = nulldata;

  bcnt = 0;
  b[0].len = 0;
  b[0].base = NULL;

  nsplit = ngtcp2_vec_split(a, &acnt, b, &bcnt, 87, 16);

  CU_ASSERT(48 == nsplit);
  CU_ASSERT(1 == acnt);
  CU_ASSERT(87 == a[0].len);
  CU_ASSERT(nulldata == a[0].base);
  CU_ASSERT(1 == bcnt);
  CU_ASSERT(48 == b[0].len);
  CU_ASSERT(nulldata + 87 == b[0].base);

  /* Multiple a vector; split at ngtcp2_vec boundary */
  acnt = 2;
  a[0].len = 33;
  a[0].base = nulldata;
  a[1].len = 89;
  a[1].base = nulldata + 33;

  bcnt = 0;
  b[0].len = 0;
  b[0].base = NULL;

  nsplit = ngtcp2_vec_split(a, &acnt, b, &bcnt, 33, 16);

  CU_ASSERT(89 == nsplit);
  CU_ASSERT(1 == acnt);
  CU_ASSERT(33 == a[0].len);
  CU_ASSERT(nulldata == a[0].base);
  CU_ASSERT(1 == bcnt);
  CU_ASSERT(89 == b[0].len);
  CU_ASSERT(nulldata + 33 == b[0].base);

  /* Multiple a vector; not split at ngtcp2_vec boundary */
  acnt = 3;
  a[0].len = 33;
  a[0].base = nulldata;
  a[1].len = 89;
  a[1].base = nulldata + 33;
  a[2].len = 211;
  a[2].base = nulldata + 33 + 89;

  bcnt = 0;
  b[0].len = 0;
  b[0].base = NULL;

  nsplit = ngtcp2_vec_split(a, &acnt, b, &bcnt, 34, 16);

  CU_ASSERT(88 + 211 == nsplit);
  CU_ASSERT(2 == acnt);
  CU_ASSERT(33 == a[0].len);
  CU_ASSERT(nulldata == a[0].base);
  CU_ASSERT(1 == a[1].len);
  CU_ASSERT(nulldata + 33 == a[1].base);
  CU_ASSERT(2 == bcnt);
  CU_ASSERT(88 == b[0].len);
  CU_ASSERT(nulldata + 34 == b[0].base);
  CU_ASSERT(211 == b[1].len);
  CU_ASSERT(nulldata + 34 + 88 == b[1].base);

  /* Multiple a vector; split at ngtcp2_vec boundary; continuous
     data */
  acnt = 2;
  a[0].len = 33;
  a[0].base = nulldata;
  a[1].len = 89;
  a[1].base = nulldata + 33;

  bcnt = 2;
  b[0].len = 17;
  b[0].base = nulldata + 33 + 89;
  b[1].len = 3;
  b[1].base = nulldata + 33 + 89 + 17;

  nsplit = ngtcp2_vec_split(a, &acnt, b, &bcnt, 33, 16);

  CU_ASSERT(89 == nsplit);
  CU_ASSERT(1 == acnt);
  CU_ASSERT(33 == a[0].len);
  CU_ASSERT(nulldata == a[0].base);
  CU_ASSERT(2 == bcnt);
  CU_ASSERT(89 + 17 == b[0].len);
  CU_ASSERT(nulldata + 33 == b[0].base);
  CU_ASSERT(3 == b[1].len);
  CU_ASSERT(nulldata + 33 + 89 + 17 == b[1].base);

  /* Multiple a vector; not split at ngtcp2_vec boundary; continuous
     data; nmove == 0 */
  acnt = 2;
  a[0].len = 33;
  a[0].base = nulldata;
  a[1].len = 89;
  a[1].base = nulldata + 33;

  bcnt = 2;
  b[0].len = 17;
  b[0].base = nulldata + 33 + 89;
  b[1].len = 3;
  b[1].base = nulldata + 33 + 89 + 17;

  nsplit = ngtcp2_vec_split(a, &acnt, b, &bcnt, 34, 16);

  CU_ASSERT(88 == nsplit);
  CU_ASSERT(2 == acnt);
  CU_ASSERT(33 == a[0].len);
  CU_ASSERT(nulldata == a[0].base);
  CU_ASSERT(1 == a[1].len);
  CU_ASSERT(nulldata + 33 == a[1].base);
  CU_ASSERT(2 == bcnt);
  CU_ASSERT(88 + 17 == b[0].len);
  CU_ASSERT(nulldata + 34 == b[0].base);
  CU_ASSERT(3 == b[1].len);
  CU_ASSERT(nulldata + 33 + 89 + 17 == b[1].base);

  /* Multiple a vector; not split at ngtcp2_vec boundary; continuous
     data */
  acnt = 3;
  a[0].len = 33;
  a[0].base = nulldata;
  a[1].len = 89;
  a[1].base = nulldata + 33;
  a[2].len = 211;
  a[2].base = nulldata + 33 + 89;

  bcnt = 2;
  b[0].len = 17;
  b[0].base = nulldata + 33 + 89 + 211;
  b[1].len = 3;
  b[1].base = nulldata + 33 + 89 + 211 + 17;

  nsplit = ngtcp2_vec_split(a, &acnt, b, &bcnt, 34, 16);

  CU_ASSERT(88 + 211 == nsplit);
  CU_ASSERT(2 == acnt);
  CU_ASSERT(33 == a[0].len);
  CU_ASSERT(nulldata == a[0].base);
  CU_ASSERT(1 == a[1].len);
  CU_ASSERT(nulldata + 33 == a[1].base);
  CU_ASSERT(3 == bcnt);
  CU_ASSERT(88 == b[0].len);
  CU_ASSERT(nulldata + 34 == b[0].base);
  CU_ASSERT(211 + 17 == b[1].len);
  CU_ASSERT(nulldata + 34 + 88 == b[1].base);
  CU_ASSERT(3 == b[2].len);
  CU_ASSERT(nulldata + 33 + 89 + 211 + 17 == b[2].base);

  /* Multiple a vector; split at ngtcp2_vec boundary; not continuous
     data */
  acnt = 2;
  a[0].len = 33;
  a[0].base = nulldata;
  a[1].len = 89;
  a[1].base = nulldata + 33;

  bcnt = 2;
  b[0].len = 17;
  b[0].base = nulldata + 256;
  b[1].len = 3;
  b[1].base = nulldata + 256 + 17;

  nsplit = ngtcp2_vec_split(a, &acnt, b, &bcnt, 33, 16);

  CU_ASSERT(89 == nsplit);
  CU_ASSERT(1 == acnt);
  CU_ASSERT(33 == a[0].len);
  CU_ASSERT(nulldata == a[0].base);
  CU_ASSERT(3 == bcnt);
  CU_ASSERT(89 == b[0].len);
  CU_ASSERT(nulldata + 33 == b[0].base);
  CU_ASSERT(17 == b[1].len);
  CU_ASSERT(nulldata + 256 == b[1].base);
  CU_ASSERT(3 == b[2].len);
  CU_ASSERT(nulldata + 256 + 17 == b[2].base);

  /* maxcnt exceeded; continuous */
  acnt = 2;
  a[0].len = 33;
  a[0].base = nulldata;
  a[1].len = 89;
  a[1].base = nulldata + 33;

  bcnt = 1;
  b[0].len = 17;
  b[0].base = nulldata + 33 + 89;

  nsplit = ngtcp2_vec_split(a, &acnt, b, &bcnt, 32, 1);

  CU_ASSERT(-1 == nsplit);

  /* maxcnt exceeded; not continuous */
  acnt = 2;
  a[0].len = 33;
  a[0].base = nulldata;
  a[1].len = 89;
  a[1].base = nulldata + 33;

  bcnt = 1;
  b[0].len = 17;
  b[0].base = nulldata + 256;

  nsplit = ngtcp2_vec_split(a, &acnt, b, &bcnt, 33, 1);

  CU_ASSERT(-1 == nsplit);
}

void test_ngtcp2_vec_merge(void) {
  uint8_t nulldata[1024];
  ngtcp2_vec a[16], b[16];
  size_t acnt, bcnt;
  size_t nmerged;

  /* Merge one ngtcp2_vec completely */
  acnt = 1;
  a[0].len = 33;
  a[0].base = nulldata;

  bcnt = 1;
  b[0].len = 11;
  b[0].base = nulldata + 33;

  nmerged = ngtcp2_vec_merge(a, &acnt, b, &bcnt, 11, 16);

  CU_ASSERT(11 == nmerged);
  CU_ASSERT(1 == acnt);
  CU_ASSERT(44 == a[0].len);
  CU_ASSERT(nulldata == a[0].base);
  CU_ASSERT(0 == bcnt);

  /* Merge ngtcp2_vec partially */
  acnt = 1;
  a[0].len = 33;
  a[0].base = nulldata;

  bcnt = 1;
  b[0].len = 11;
  b[0].base = nulldata + 33;

  nmerged = ngtcp2_vec_merge(a, &acnt, b, &bcnt, 10, 16);

  CU_ASSERT(10 == nmerged);
  CU_ASSERT(1 == acnt);
  CU_ASSERT(43 == a[0].len);
  CU_ASSERT(nulldata == a[0].base);
  CU_ASSERT(1 == bcnt);
  CU_ASSERT(1 == b[0].len);
  CU_ASSERT(nulldata + 33 + 10 == b[0].base);

  /* Merge one ngtcp2_vec completely; data is not continuous */
  acnt = 1;
  a[0].len = 33;
  a[0].base = nulldata;

  bcnt = 1;
  b[0].len = 11;
  b[0].base = nulldata + 256;

  nmerged = ngtcp2_vec_merge(a, &acnt, b, &bcnt, 11, 16);

  CU_ASSERT(11 == nmerged);
  CU_ASSERT(2 == acnt);
  CU_ASSERT(33 == a[0].len);
  CU_ASSERT(nulldata == a[0].base);
  CU_ASSERT(11 == a[1].len);
  CU_ASSERT(nulldata + 256 == a[1].base);
  CU_ASSERT(0 == bcnt);

  /* Merge ngtcp2_vec partially; data is not continuous */
  acnt = 1;
  a[0].len = 33;
  a[0].base = nulldata;

  bcnt = 1;
  b[0].len = 11;
  b[0].base = nulldata + 256;

  nmerged = ngtcp2_vec_merge(a, &acnt, b, &bcnt, 10, 16);

  CU_ASSERT(10 == nmerged);
  CU_ASSERT(2 == acnt);
  CU_ASSERT(33 == a[0].len);
  CU_ASSERT(nulldata == a[0].base);
  CU_ASSERT(10 == a[1].len);
  CU_ASSERT(nulldata + 256 == a[1].base);
  CU_ASSERT(1 == bcnt);
  CU_ASSERT(1 == b[0].len);
  CU_ASSERT(nulldata + 256 + 10 == b[0].base);

  /* Merge ends at the ngtcp2_vec boundary */
  acnt = 1;
  a[0].len = 33;
  a[0].base = nulldata;

  bcnt = 2;
  b[0].len = 11;
  b[0].base = nulldata + 256;
  b[1].len = 19;
  b[1].base = nulldata + 256 + 11;

  nmerged = ngtcp2_vec_merge(a, &acnt, b, &bcnt, 11, 16);

  CU_ASSERT(11 == nmerged);
  CU_ASSERT(2 == acnt);
  CU_ASSERT(33 == a[0].len);
  CU_ASSERT(nulldata == a[0].base);
  CU_ASSERT(11 == a[1].len);
  CU_ASSERT(nulldata + 256 == a[1].base);
  CU_ASSERT(1 == bcnt);
  CU_ASSERT(19 == b[0].len);
  CU_ASSERT(nulldata + 256 + 11 == b[0].base);

  /* Merge occurs at the last object */
  acnt = 1;
  a[0].len = 33;
  a[0].base = nulldata;

  bcnt = 2;
  b[0].len = 11;
  b[0].base = nulldata + 33;
  b[1].len = 99;
  b[1].base = nulldata + 33 + 11;

  nmerged = ngtcp2_vec_merge(a, &acnt, b, &bcnt, 100, 1);

  CU_ASSERT(100 == nmerged);
  CU_ASSERT(1 == acnt);
  CU_ASSERT(133 == a[0].len);
  CU_ASSERT(nulldata == a[0].base);
  CU_ASSERT(1 == bcnt);
  CU_ASSERT(10 == b[0].len);
  CU_ASSERT(nulldata + 33 + 11 + 89 == b[0].base);

  /* No merge occurs if object is full */
  acnt = 1;
  a[0].len = 33;
  a[0].base = nulldata;

  bcnt = 1;
  b[0].len = 3;
  b[0].base = nulldata + 100;

  nmerged = ngtcp2_vec_merge(a, &acnt, b, &bcnt, 3, 1);

  CU_ASSERT(0 == nmerged);
}

void test_ngtcp2_vec_len_varint(void) {
  CU_ASSERT(0 == ngtcp2_vec_len_varint(NULL, 0));

#if SIZE_MAX == UINT64_MAX
  {
    ngtcp2_vec v[] = {{NULL, NGTCP2_MAX_VARINT}, {NULL, 1}};

    CU_ASSERT(-1 == ngtcp2_vec_len_varint(v, ngtcp2_arraylen(v)));
  }

  {
    ngtcp2_vec v[] = {{NULL, NGTCP2_MAX_VARINT - 1}, {NULL, 1}};

    CU_ASSERT(NGTCP2_MAX_VARINT ==
              ngtcp2_vec_len_varint(v, ngtcp2_arraylen(v)));
  }
#endif /* SIZE_MAX == UINT64_MAX */
}