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diff --git a/archival/libunarchive/unxz/xz_private.h b/archival/libunarchive/unxz/xz_private.h
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+/*
+ * Private includes and definitions
+ *
+ * Author: Lasse Collin <lasse.collin@tukaani.org>
+ *
+ * This file has been put into the public domain.
+ * You can do whatever you want with this file.
+ */
+
+#ifndef XZ_PRIVATE_H
+#define XZ_PRIVATE_H
+
+#ifdef __KERNEL__
+ /* XZ_PREBOOT may be defined only via decompress_unxz.c. */
+# ifndef XZ_PREBOOT
+# include <linux/slab.h>
+# include <linux/vmalloc.h>
+# include <linux/string.h>
+# define memeq(a, b, size) (memcmp(a, b, size) == 0)
+# define memzero(buf, size) memset(buf, 0, size)
+# endif
+# include <asm/byteorder.h>
+# include <asm/unaligned.h>
+# define get_le32(p) le32_to_cpup((const uint32_t *)(p))
+ /* XZ_IGNORE_KCONFIG may be defined only via decompress_unxz.c. */
+# ifndef XZ_IGNORE_KCONFIG
+# ifdef CONFIG_XZ_DEC_X86
+# define XZ_DEC_X86
+# endif
+# ifdef CONFIG_XZ_DEC_POWERPC
+# define XZ_DEC_POWERPC
+# endif
+# ifdef CONFIG_XZ_DEC_IA64
+# define XZ_DEC_IA64
+# endif
+# ifdef CONFIG_XZ_DEC_ARM
+# define XZ_DEC_ARM
+# endif
+# ifdef CONFIG_XZ_DEC_ARMTHUMB
+# define XZ_DEC_ARMTHUMB
+# endif
+# ifdef CONFIG_XZ_DEC_SPARC
+# define XZ_DEC_SPARC
+# endif
+# endif
+# include <linux/xz.h>
+#else
+ /*
+ * For userspace builds, use a separate header to define the required
+ * macros and functions. This makes it easier to adapt the code into
+ * different environments and avoids clutter in the Linux kernel tree.
+ */
+# include "xz_config.h"
+#endif
+
+/*
+ * If any of the BCJ filter decoders are wanted, define XZ_DEC_BCJ.
+ * XZ_DEC_BCJ is used to enable generic support for BCJ decoders.
+ */
+#ifndef XZ_DEC_BCJ
+# if defined(XZ_DEC_X86) || defined(XZ_DEC_POWERPC) \
+ || defined(XZ_DEC_IA64) || defined(XZ_DEC_ARM) \
+ || defined(XZ_DEC_ARM) || defined(XZ_DEC_ARMTHUMB) \
+ || defined(XZ_DEC_SPARC)
+# define XZ_DEC_BCJ
+# endif
+#endif
+
+/*
+ * Allocate memory for LZMA2 decoder. xz_dec_lzma2_reset() must be used
+ * before calling xz_dec_lzma2_run().
+ */
+XZ_EXTERN struct xz_dec_lzma2 * XZ_FUNC xz_dec_lzma2_create(
+ uint32_t dict_max);
+
+/*
+ * Decode the LZMA2 properties (one byte) and reset the decoder. Return
+ * XZ_OK on success, XZ_MEMLIMIT_ERROR if the preallocated dictionary is not
+ * big enough, and XZ_OPTIONS_ERROR if props indicates something that this
+ * decoder doesn't support.
+ */
+XZ_EXTERN enum xz_ret XZ_FUNC xz_dec_lzma2_reset(
+ struct xz_dec_lzma2 *s, uint8_t props);
+
+/* Decode raw LZMA2 stream from b->in to b->out. */
+XZ_EXTERN enum xz_ret XZ_FUNC xz_dec_lzma2_run(
+ struct xz_dec_lzma2 *s, struct xz_buf *b);
+
+/* Free the memory allocated for the LZMA2 decoder. */
+XZ_EXTERN void XZ_FUNC xz_dec_lzma2_end(struct xz_dec_lzma2 *s);
+
+#ifdef XZ_DEC_BCJ
+/*
+ * Allocate memory for BCJ decoders. xz_dec_bcj_reset() must be used before
+ * calling xz_dec_bcj_run().
+ */
+XZ_EXTERN struct xz_dec_bcj * XZ_FUNC xz_dec_bcj_create(bool single_call);
+
+/*
+ * Decode the Filter ID of a BCJ filter. This implementation doesn't
+ * support custom start offsets, so no decoding of Filter Properties
+ * is needed. Returns XZ_OK if the given Filter ID is supported.
+ * Otherwise XZ_OPTIONS_ERROR is returned.
+ */
+XZ_EXTERN enum xz_ret XZ_FUNC xz_dec_bcj_reset(
+ struct xz_dec_bcj *s, uint8_t id);
+
+/*
+ * Decode raw BCJ + LZMA2 stream. This must be used only if there actually is
+ * a BCJ filter in the chain. If the chain has only LZMA2, xz_dec_lzma2_run()
+ * must be called directly.
+ */
+XZ_EXTERN enum xz_ret XZ_FUNC xz_dec_bcj_run(struct xz_dec_bcj *s,
+ struct xz_dec_lzma2 *lzma2, struct xz_buf *b);
+#endif
+
+/* Free the memory allocated for the BCJ filters. */
+#define xz_dec_bcj_end(s) kfree(s)
+
+#endif