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

xz/src/liblzma/common/stream_flags_common.c

+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       stream_flags_common.c
+/// \brief      Common stuff for Stream flags coders
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "stream_flags_common.h"
+
+
+const uint8_t lzma_header_magic[6] = { 0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00 };
+const uint8_t lzma_footer_magic[2] = { 0x59, 0x5A };
+
+
+extern LZMA_API(lzma_ret)
+lzma_stream_flags_compare(
+                const lzma_stream_flags *a, const lzma_stream_flags *b)
+{
+        // We can compare only version 0 structures.
+        if (a->version != 0 || b->version != 0)
+                return LZMA_OPTIONS_ERROR;
+
+        // Check type
+        if ((unsigned int)(a->check) > LZMA_CHECK_ID_MAX
+                        || (unsigned int)(b->check) > LZMA_CHECK_ID_MAX)
+                return LZMA_PROG_ERROR;
+
+        if (a->check != b->check)
+                return LZMA_DATA_ERROR;
+
+        // Backward Sizes are compared only if they are known in both.
+        if (a->backward_size != LZMA_VLI_UNKNOWN
+                        && b->backward_size != LZMA_VLI_UNKNOWN) {
+                if (!is_backward_size_valid(a) || !is_backward_size_valid(b))
+                        return LZMA_PROG_ERROR;
+
+                if (a->backward_size != b->backward_size)
+                        return LZMA_DATA_ERROR;
+        }
+
+        return LZMA_OK;
+}