unxz: new applet, complete with xzcat and xz -d aliases

function                                             old     new   delta
unpack_xz_stream_stdin                                 -    3953   +3953
lzma_main                                              -    2601   +2601
lzma_len                                               -     516    +516
dec_vli                                                -     165    +165
dict_repeat                                            -     103    +103
lzma_reset                                             -      98     +98
fill_temp                                              -      98     +98
crc32_validate                                         -      93     +93
xz_dec_reset                                           -      77     +77
unxz_main                                              -      77     +77
index_update                                           -      47     +47
xz_crc32                                               -      40     +40
packed_usage                                       27044   27060     +16
make_new_name_unxz                                     -      14     +14
applet_names                                        2240    2254     +14
applet_main                                         1312    1324     +12
applet_nameofs                                       656     662      +6
unpack_unxz                                            -       5      +5
send_tree                                            355     360      +5
applet_install_loc                                   164     166      +2
------------------------------------------------------------------------------
(add/remove: 15/0 grow/shrink: 6/0 up/down: 7942/0)          Total: 7942 bytes
   text    data     bss     dec     hex filename
 844032     453    6812  851297   cfd61 busybox_old
 852063     453    6812  859328   d1cc0 busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/archival/libunarchive/unxz/xz_stream.h b/archival/libunarchive/unxz/xz_stream.h
new file mode 100644
index 000000000..efbe75ae3
--- /dev/null
+++ b/archival/libunarchive/unxz/xz_stream.h
@@ -0,0 +1,46 @@
+/*
+ * Definitions for handling the .xz file format
+ *
+ * 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_STREAM_H
+#define XZ_STREAM_H
+
+#if defined(__KERNEL__) && !defined(XZ_INTERNAL_CRC32)
+#	include <linux/crc32.h>
+#	undef crc32
+#	define xz_crc32(crc32_table, buf, size, crc) \
+		(~crc32_le(~(uint32_t)(crc), buf, size))
+#endif
+
+/*
+ * See the .xz file format specification at
+ * http://tukaani.org/xz/xz-file-format.txt
+ * to understand the container format.
+ */
+
+#define STREAM_HEADER_SIZE 12
+
+#define HEADER_MAGIC "\3757zXZ\0"
+#define HEADER_MAGIC_SIZE 6
+
+#define FOOTER_MAGIC "YZ"
+#define FOOTER_MAGIC_SIZE 2
+
+/*
+ * Variable-length integer can hold a 63-bit unsigned integer, or a special
+ * value to indicate that the value is unknown.
+ */
+typedef uint64_t vli_type;
+
+#define VLI_MAX ((vli_type)-1 / 2)
+#define VLI_UNKNOWN ((vli_type)-1)
+
+/* Maximum encoded size of a VLI */
+#define VLI_BYTES_MAX (sizeof(vli_type) * 8 / 7)
+
+#endif