xz: Add .lz (lzip) decompression support.

If configured with --disable-lzip-decoder then --long-help will
still list `lzip' in --format but I left it like that since
due to translations it would be messy to have two help strings.
Features are disabled only in special situations so wrong help
in such a situation shouldn't matter much.

Thanks to Michał Górny for the original patch.

1 files changed, 41 insertions, 5 deletions

diff --git a/src/xz/xz.1 b/src/xz/xz.1
index e11f4ac2..5e11a332 100644
--- a/src/xz/xz.1
+++ b/src/xz/xz.1
@@ -5,7 +5,7 @@
 .\" This file has been put into the public domain.
 .\" You can do whatever you want with this file.
 .\"
-.TH XZ 1 "2022-11-07" "Tukaani" "XZ Utils"
+.TH XZ 1 "2022-11-09" "Tukaani" "XZ Utils"
 .
 .SH NAME
 xz, unxz, xzcat, lzma, unlzma, lzcat \- Compress or decompress .xz and .lzma files
@@ -62,6 +62,11 @@ format, but the legacy
 format used by LZMA Utils and
 raw compressed streams with no container format headers
 are also supported.
+In addition, decompression of the
+.B .lz
+format used by
+.B lzip
+is supported.
 .PP
 .B xz
 compresses or decompresses each
@@ -102,9 +107,10 @@ or
 is appended to the source filename to get the target filename.
 .IP \(bu 3
 When decompressing, the
-.B .xz
+.BR .xz ,
+.BR .lzma ,
 or
-.B .lzma
+.B .lz
 suffix is removed from the filename to get the target filename.
 .B xz
 also recognizes the suffixes
@@ -158,8 +164,9 @@ doesn't have a suffix of any of the supported file formats
 .RB ( .xz ,
 .BR .txz ,
 .BR .lzma ,
+.BR .tlz ,
 or
-.BR .tlz ).
+.BR .lz ).
 .PP
 After successfully compressing or decompressing the
 .IR file ,
@@ -507,8 +514,9 @@ in addition to files with the
 .BR .xz ,
 .BR .txz ,
 .BR .lzma ,
+.BR .tlz ,
 or
-.B .tlz
+.B .lz
 suffix.
 If the source file has the suffix
 .IR .suf ,
@@ -575,6 +583,34 @@ The alternative name
 .B alone
 is provided for backwards compatibility with LZMA Utils.
 .TP
+.B lzip
+Accept only
+.B .lz
+files when decompressing.
+Compression is not supported.
+.IP ""
+The
+.B .lz
+format version 0 and the unextended version 1 are supported.
+Version 0 files were produced by
+.B lzip
+1.3 and older.
+Such files aren't common but may be found from file archives
+as a few source packages were released in this format.
+People might have old personal files in this format too.
+Decompression support for the format version 0 was removed in
+.B lzip
+1.18.
+.IP ""
+.B lzip
+1.4 and later create files in the format version 1.
+The sync flush marker extension to the format version 1 was added in
+.B lzip
+1.6.
+This extension is rarely used and isn't supported by
+.B xz
+(diagnosed as corrupt input).
+.TP
 .B raw
 Compress or uncompress a raw stream (no headers).
 This is meant for advanced users only.