// SPDX-License-Identifier: 0BSD

///////////////////////////////////////////////////////////////////////////////

//

/// \file       lzma_encoder_presets.c

/// \brief      Encoder presets

/// \note       xz needs this even when only decoding is enabled.

//

//  Author:     Lasse Collin

//

///////////////////////////////////////////////////////////////////////////////

#include "common.h"

extern LZMA_API(lzma_bool)

lzma_lzma_preset(lzma_options_lzma *options, uint32_t preset)

{

  const uint32_t level = preset & LZMA_PRESET_LEVEL_MASK;

  const uint32_t flags = preset & ~LZMA_PRESET_LEVEL_MASK;

  const uint32_t supported_flags = LZMA_PRESET_EXTREME;

  if (level > 9 || (flags & ~supported_flags))

    return true;

  options->preset_dict = NULL;

  options->preset_dict_size = 0;

  options->lc = LZMA_LC_DEFAULT;

  options->lp = LZMA_LP_DEFAULT;

  options->pb = LZMA_PB_DEFAULT;

  static const uint8_t dict_pow2[]

      = { 18, 20, 21, 22, 22, 23, 23, 24, 25, 26 };

  options->dict_size = UINT32_C(1) << dict_pow2[level];

  if (level <= 3) {

    options->mode = LZMA_MODE_FAST;

    options->mf = level == 0 ? LZMA_MF_HC3 : LZMA_MF_HC4;

    options->nice_len = level <= 1 ? 128 : 273;

    static const uint8_t depths[] = { 4, 8, 24, 48 };

    options->depth = depths[level];

  } else {

    options->mode = LZMA_MODE_NORMAL;

    options->mf = LZMA_MF_BT4;

    options->nice_len = level == 4 ? 16 : level == 5 ? 32 : 64;

    options->depth = 0;

  }

  if (flags & LZMA_PRESET_EXTREME) {

    options->mode = LZMA_MODE_NORMAL;

    options->mf = LZMA_MF_BT4;

    if (level == 3 || level == 5) {

      options->nice_len = 192;

      options->depth = 0;

    } else {

      options->nice_len = 273;

      options->depth = 512;

    }

  }

  return false;

}