From 1817a0c73f6aef9e69f7105ad19ca78ad6cbffd9 Mon Sep 17 00:00:00 2001
From: David Monniaux <david.monniaux@univ-grenoble-alpes.fr>
Date: Sat, 2 Feb 2019 15:25:21 +0100
Subject: compress42

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+# About
+
+This is version 4.2 of (N)compress (an improved version of compress 4.1).
+
+Compress is a fast, simple LZW file compressor.  Compress does not have
+the highest compression rate, but it is one of the fastest programs to
+compress data.  Compress is the defacto standard in the UNIX community
+for compressing files.
+
+(N)compress 4.2 has a special, fast compression hash algorithm.  This
+algorithm uses more memory than the old hash table. If you don't want
+the faster hash table algorithm set 'Memory free for compress' below
+800000.
+
+zcmp, zdiff, zmore were copied from version 4.1 without any changes.
+
+The output of (N)compress 4.2 is fully compatible with that of compress 3.0.
+In other words, the output of (N)compress 4.2 may be fed into uncompress 3.0 or
+the output of compress 3.0 may be fed into uncompress 4.2.
+
+The output of (N)compress 4.2 is not compatible with that of
+compress 2.0.  However, compress 4.2 still accepts the output of
+compress 2.0.  To generate output that is compatible with compress
+2.0, use the undocumented "-C" flag.
+
+# Building
+
+For recent systems with GNU make, you can simply run `make` as the default
+'GNUMakefile' will get picked up.
+
+'build' is a menu driven shell script for compiling, testing and
+installing (N)compress. So to build and install (N)compress all you have to
+do is run build.  Build will first test your system for default
+settings. The current compile settings are stored in a special file
+called compress.def.
+
+For user with problems with build there is a default makefile included
+called 'Makefile.def'. Also build is capable of generating a Makefile with
+all options (option genmake).
+
+# Support
+
+[![Build Status](https://travis-ci.org/vapier/ncompress.svg?branch=ncompress-4.2.4)](https://travis-ci.org/vapier/ncompress)
+
+Send comments, complaints and especially patches relating to
+    https://github.com/vapier/ncompress/issues
+
+# Licensing
+
+The ncompress code is released into the public domain.  See the
+[UNLICENSE](UNLICENSE) file for more details.
+
+# Patents
+
+All existing patents on the LZW algorithm have
+[expired world-wide](http://en.wikipedia.org/wiki/LZW#Patent_issues).
+So LZW is now patent free.
+
+# Remarks
+
+- Build is a bourne shell script. On some system it is necessary to type
+  'sh build'.
+
+- The build script usages tput for nice screen handling of the script.
+  If your system has no tput no problems.
+
+- For configuration testing build uses a lot of small C programs. During
+  those test stderr is redirected to /dev/null.
+  During the compilation of compress output is NOT redirected.
+
+- The /bin/sh under Ultrix can't handle ${var:-str} so use ksh for the
+  build script.
+
+- The output if (N)compress 4.2 is not exactly the same as compress 4.0
+  because of different table reset point. The output of (N)compress 4.2
+  is 100% compatible with compress 4.0
+
+- Some systems has performance problems with reads bigger than BUFSIZ
+  (The read a head function is not working as expected). For those
+  system use the default BSIZE input buffer size.
+
+- (N)compress can by slower on small files (<10Kb) because of a great
+  table reset overhead. Use cpio or tar to make 1 bigger file if
+  possible, it is faster and also gives a better compression ratio most
+  of the time.
+
+- (N)compress is slower in vax systems because of removing some
+  undocumented inline assembler.
+
+- files compressed on a large machine with more bits than allowed by
+  a version of compress on a smaller machine cannot be decompressed!  Use the
+  "-b12" flag to generate a file on a large machine that can be uncompressed
+  on a 16-bit machine.
+
+- compatibility with compress 3.0 has not been tested in the 4.2 release of
+  (N)compress.
+
+- There has been 1 problem report in relation to GCC 2.0 on a sparc
+  workstation. GCC 2.0 seems to generate a bad compress. Use the
+  standard c compiler 'cc'.
-- 
cgit