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author | Lasse Collin <lasse.collin@tukaani.org> | 2015-11-03 20:55:45 +0200 |
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committer | Lasse Collin <lasse.collin@tukaani.org> | 2015-11-03 20:55:45 +0200 |
commit | f4c95ba94beb71a608eb6eadbf82b44f53a0260e (patch) | |
tree | 0b1c9ca86247806e078ebe51fa0b395ad82c40e0 /src/liblzma/lzma/lzma_encoder_presets.c | |
parent | Build: Disable xzdec, lzmadec, and lzmainfo when they cannot be built. (diff) | |
download | xz-f4c95ba94beb71a608eb6eadbf82b44f53a0260e.tar.xz |
liblzma: Rename lzma_presets.c back to lzma_encoder_presets.c.
It would be too annoying to update other build systems
just because of this.
Diffstat (limited to 'src/liblzma/lzma/lzma_encoder_presets.c')
-rw-r--r-- | src/liblzma/lzma/lzma_encoder_presets.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/src/liblzma/lzma/lzma_encoder_presets.c b/src/liblzma/lzma/lzma_encoder_presets.c new file mode 100644 index 00000000..711df025 --- /dev/null +++ b/src/liblzma/lzma/lzma_encoder_presets.c @@ -0,0 +1,64 @@ +/////////////////////////////////////////////////////////////////////////////// +// +/// \file lzma_encoder_presets.c +/// \brief Encoder presets +/// \note xz needs this even when only decoding is enabled. +// +// Author: Lasse Collin +// +// This file has been put into the public domain. +// You can do whatever you want with this file. +// +/////////////////////////////////////////////////////////////////////////////// + +#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; +} |