Add an unpatched version of xz, XZ Utils, to /trunk/deps/third_party

xz/src/liblzma/lzma/lzma_encoder_presets.c

+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       lzma_encoder_presets.c
+/// \brief      Encoder presets
+//
+//  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;
+
+        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->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;
+}