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///////////////////////////////////////////////////////////////////////////////
//
/// \file lzma_encoder_presets.c
/// \brief Encoder presets
//
// Copyright (C) 2007 Lasse Collin
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
///////////////////////////////////////////////////////////////////////////////
#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;
const uint32_t dict_shift = level <= 1 ? 16 : level + 17;
options->dict_size = UINT32_C(1) << dict_shift;
options->preset_dict = NULL;
options->preset_dict_size = 0;
options->lc = LZMA_LC_DEFAULT;
options->lp = LZMA_LP_DEFAULT;
options->pb = LZMA_PB_DEFAULT;
options->persistent = false;
options->mode = level <= 2 ? LZMA_MODE_FAST : LZMA_MODE_NORMAL;
options->nice_len = level == 0 ? 8 : level <= 5 ? 32 : 64;
options->mf = level <= 1 ? LZMA_MF_HC3 : level <= 2 ? LZMA_MF_HC4
: LZMA_MF_BT4;
options->depth = 0;
if (flags & LZMA_PRESET_EXTREME) {
options->lc = 4; // FIXME?
options->mode = LZMA_MODE_NORMAL;
options->mf = LZMA_MF_BT4;
options->nice_len = 273;
options->depth = 512;
}
return false;
}
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