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

xz/src/liblzma/simple/simple_encoder.c

+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       simple_encoder.c
+/// \brief      Properties encoder for simple filters
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "simple_encoder.h"
+
+
+extern lzma_ret
+lzma_simple_props_size(uint32_t *size, const void *options)
+{
+        const lzma_options_bcj *const opt = options;
+        *size = (opt == NULL || opt->start_offset == 0) ? 0 : 4;
+        return LZMA_OK;
+}
+
+
+extern lzma_ret
+lzma_simple_props_encode(const void *options, uint8_t *out)
+{
+        const lzma_options_bcj *const opt = options;
+
+        // The default start offset is zero, so we don't need to store any
+        // options unless the start offset is non-zero.
+        if (opt == NULL || opt->start_offset == 0)
+                return LZMA_OK;
+
+        unaligned_write32le(out, opt->start_offset);
+
+        return LZMA_OK;
+}