| 1 | ///////////////////////////////////////////////////////////////////////////////
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| 2 | //
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| 3 | /// \file lzma_encoder_presets.c
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| 4 | /// \brief Encoder presets
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| 5 | /// \note xz needs this even when only decoding is enabled.
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| 6 | //
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| 7 | // Author: Lasse Collin
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| 8 | //
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| 9 | // This file has been put into the public domain.
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| 10 | // You can do whatever you want with this file.
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| 11 | //
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| 12 | ///////////////////////////////////////////////////////////////////////////////
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| 13 |
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| 14 | #include "common.h"
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| 15 |
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| 16 |
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| 17 | extern LZMA_API(lzma_bool)
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| 18 | lzma_lzma_preset(lzma_options_lzma *options, uint32_t preset)
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| 19 | {
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| 20 | const uint32_t level = preset & LZMA_PRESET_LEVEL_MASK;
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| 21 | const uint32_t flags = preset & ~LZMA_PRESET_LEVEL_MASK;
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| 22 | const uint32_t supported_flags = LZMA_PRESET_EXTREME;
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| 23 |
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| 24 | if (level > 9 || (flags & ~supported_flags))
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| 25 | return true;
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| 26 |
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| 27 | options->preset_dict = NULL;
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| 28 | options->preset_dict_size = 0;
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| 29 |
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| 30 | options->lc = LZMA_LC_DEFAULT;
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| 31 | options->lp = LZMA_LP_DEFAULT;
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| 32 | options->pb = LZMA_PB_DEFAULT;
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| 33 |
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| 34 | static const uint8_t dict_pow2[]
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| 35 | = { 18, 20, 21, 22, 22, 23, 23, 24, 25, 26 };
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| 36 | options->dict_size = UINT32_C(1) << dict_pow2[level];
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| 37 |
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| 38 | if (level <= 3) {
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| 39 | options->mode = LZMA_MODE_FAST;
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| 40 | options->mf = level == 0 ? LZMA_MF_HC3 : LZMA_MF_HC4;
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| 41 | options->nice_len = level <= 1 ? 128 : 273;
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| 42 | static const uint8_t depths[] = { 4, 8, 24, 48 };
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| 43 | options->depth = depths[level];
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| 44 | } else {
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| 45 | options->mode = LZMA_MODE_NORMAL;
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| 46 | options->mf = LZMA_MF_BT4;
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| 47 | options->nice_len = level == 4 ? 16 : level == 5 ? 32 : 64;
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| 48 | options->depth = 0;
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| 49 | }
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| 50 |
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| 51 | if (flags & LZMA_PRESET_EXTREME) {
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| 52 | options->mode = LZMA_MODE_NORMAL;
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| 53 | options->mf = LZMA_MF_BT4;
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| 54 | if (level == 3 || level == 5) {
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| 55 | options->nice_len = 192;
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| 56 | options->depth = 0;
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| 57 | } else {
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| 58 | options->nice_len = 273;
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| 59 | options->depth = 512;
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| 60 | }
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| 61 | }
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| 62 |
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| 63 | return false;
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| 64 | }
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