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

xz/src/liblzma/common/filter_flags_decoder.c

+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       filter_flags_decoder.c
+/// \brief      Decodes a Filter Flags field
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "filter_decoder.h"
+
+
+extern LZMA_API(lzma_ret)
+lzma_filter_flags_decode(
+                lzma_filter *filter, lzma_allocator *allocator,
+                const uint8_t *in, size_t *in_pos, size_t in_size)
+{
+        // Set the pointer to NULL so the caller can always safely free it.
+        filter->options = NULL;
+
+        // Filter ID
+        return_if_error(lzma_vli_decode(&filter->id, NULL,
+                        in, in_pos, in_size));
+
+        if (filter->id >= LZMA_FILTER_RESERVED_START)
+                return LZMA_DATA_ERROR;
+
+        // Size of Properties
+        lzma_vli props_size;
+        return_if_error(lzma_vli_decode(&props_size, NULL,
+                        in, in_pos, in_size));
+
+        // Filter Properties
+        if (in_size - *in_pos < props_size)
+                return LZMA_DATA_ERROR;
+
+        const lzma_ret ret = lzma_properties_decode(
+                        filter, allocator, in + *in_pos, props_size);
+
+        *in_pos += props_size;
+
+        return ret;
+}