integrate lzma

[zpackage] / lzma / lzma / lzma_encoder_presets.c

diff --git a/lzma/lzma/lzma_encoder_presets.c b/lzma/lzma/lzma_encoder_presets.c
new file mode 100644 (file)
index 0000000..711df02
--- /dev/null
+++ b/lzma/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;
+}