diff --git a/archival/libarchive/decompress_unxz.c b/archival/libarchive/decompress_unxz.c
new file mode 100644
index 0000000..e90dfb0
--- /dev/null
+++ b/archival/libarchive/decompress_unxz.c
@@ -0,0 +1,98 @@
+/*
+ * This file uses XZ Embedded library code which is written
+ * by Lasse Collin <lasse.collin@tukaani.org>
+ * and Igor Pavlov <http://7-zip.org/>
+ *
+ * See README file in unxz/ directory for more information.
+ *
+ * This file is:
+ * Copyright (C) 2010 Denys Vlasenko <vda.linux@googlemail.com>
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+#include "libbb.h"
+#include "archive.h"
+
+#define XZ_FUNC FAST_FUNC
+#define XZ_EXTERN static
+
+#define XZ_DEC_DYNALLOC
+
+/* Skip check (rather than fail) of unsupported hash functions */
+#define XZ_DEC_ANY_CHECK  1
+
+/* We use our own crc32 function */
+#define XZ_INTERNAL_CRC32 0
+static uint32_t xz_crc32(const uint8_t *buf, size_t size, uint32_t crc)
+{
+	return ~crc32_block_endian0(~crc, buf, size, global_crc32_table);
+}
+
+/* We use arch-optimized unaligned accessors */
+#define get_unaligned_le32(buf) ({ uint32_t v; move_from_unaligned32(v, buf); SWAP_LE32(v); })
+#define get_unaligned_be32(buf) ({ uint32_t v; move_from_unaligned32(v, buf); SWAP_BE32(v); })
+#define put_unaligned_le32(val, buf) move_to_unaligned16(buf, SWAP_LE32(val))
+#define put_unaligned_be32(val, buf) move_to_unaligned16(buf, SWAP_BE32(val))
+
+#include "unxz/xz_dec_bcj.c"
+#include "unxz/xz_dec_lzma2.c"
+#include "unxz/xz_dec_stream.c"
+
+IF_DESKTOP(long long) int FAST_FUNC
+unpack_xz_stream(int src_fd, int dst_fd)
+{
+	struct xz_buf iobuf;
+	struct xz_dec *state;
+	unsigned char *membuf;
+	IF_DESKTOP(long long) int total = 0;
+
+	if (!global_crc32_table)
+		global_crc32_table = crc32_filltable(NULL, /*endian:*/ 0);
+
+	memset(&iobuf, 0, sizeof(iobuf));
+	/* Preload XZ file signature */
+	membuf = (void*) strcpy(xmalloc(2 * BUFSIZ), HEADER_MAGIC);
+	iobuf.in = membuf;
+	iobuf.in_size = HEADER_MAGIC_SIZE;
+	iobuf.out = membuf + BUFSIZ;
+	iobuf.out_size = BUFSIZ;
+
+	/* Limit memory usage to about 64 MiB. */
+	state = xz_dec_init(XZ_DYNALLOC, 64*1024*1024);
+
+	while (1) {
+		enum xz_ret r;
+
+		if (iobuf.in_pos == iobuf.in_size) {
+			int rd = safe_read(src_fd, membuf, BUFSIZ);
+			if (rd < 0) {
+				bb_error_msg(bb_msg_read_error);
+				total = -1;
+				break;
+			}
+			iobuf.in_size = rd;
+			iobuf.in_pos = 0;
+		}
+//		bb_error_msg(">in pos:%d size:%d out pos:%d size:%d",
+//				iobuf.in_pos, iobuf.in_size, iobuf.out_pos, iobuf.out_size);
+		r = xz_dec_run(state, &iobuf);
+//		bb_error_msg("<in pos:%d size:%d out pos:%d size:%d r:%d",
+//				iobuf.in_pos, iobuf.in_size, iobuf.out_pos, iobuf.out_size, r);
+		if (iobuf.out_pos) {
+			xwrite(dst_fd, iobuf.out, iobuf.out_pos);
+			IF_DESKTOP(total += iobuf.out_pos;)
+			iobuf.out_pos = 0;
+		}
+		if (r == XZ_STREAM_END) {
+			break;
+		}
+		if (r != XZ_OK && r != XZ_UNSUPPORTED_CHECK) {
+			bb_error_msg("corrupted data");
+			total = -1;
+			break;
+		}
+	}
+	xz_dec_end(state);
+	free(membuf);
+
+	return total;
+}