/**

 *

 * @copyright Copyright (c) 2019 Joachim Bauch <mail@joachim-bauch.de>

 *

 * @license GNU GPL version 3 or any later version

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <https://www.gnu.org/licenses/>.

 *

 */

#include <assert.h>

#include <stdint.h>

#include "Ppmd7.h"

#include "common-alloc.h"

#include "common-buffer.h"

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {

  if (size <= 10) {

    return 0;

  }

  CPpmd7 p_enc;

  Ppmd7_Construct(&p_enc);

  UInt32 memsize = PPMD7_MIN_MEM_SIZE;

  if (!Ppmd7_Alloc(&p_enc, memsize, &CommonAlloc)) {

    return 0;

  }

  int order = data[0];

  if (order < PPMD7_MIN_ORDER || order > PPMD7_MAX_ORDER) {

    Ppmd7_Free(&p_enc, &CommonAlloc);

    return 0;

  }

  Ppmd7_Init(&p_enc, order);

  OutputByteBuffer out_buffer;

  CPpmd7z_RangeEnc enc;

  Ppmd7z_RangeEnc_Init(&enc);

  enc.Stream = out_buffer.stream();

  for (size_t i = 0; i < size; ++i) {

    Ppmd7_EncodeSymbol(&p_enc, &enc, data[i]);

  }

  Ppmd7z_RangeEnc_FlushData(&enc);

  Ppmd7_Free(&p_enc, &CommonAlloc);

  {

    assert(out_buffer.size() >= 5);

    InputByteBuffer in_buffer(out_buffer.data(), out_buffer.size());

    CPpmd7 p_dec;

    Ppmd7_Construct(&p_dec);

    assert(Ppmd7_Alloc(&p_dec, memsize, &CommonAlloc));

    Ppmd7_Init(&p_dec, order);

    CPpmd7z_RangeDec dec;

    Ppmd7z_RangeDec_CreateVTable(&dec);

    dec.Stream = in_buffer.stream();

    assert(Ppmd7z_RangeDec_Init(&dec));

    for (size_t i = 0; i < size; ++i) {

      int sym = Ppmd7_DecodeSymbol(&p_dec, &dec.vt);

      assert(sym >= 0);

      assert(sym == data[i]);

    }

    Ppmd7_Free(&p_dec, &CommonAlloc);

  }

  return 0;

}