From 8847faffbf78ad7166826a56fb15902fca0e2603 Mon Sep 17 00:00:00 2001
From: Przemyslaw Skibinski <inikep@gmail.com>
Date: Thu, 3 Nov 2016 16:17:38 +0100
Subject: updated programs/README.md

---
 Makefile           |  3 +--
 programs/README.md | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++---
 tests/Makefile     |  2 +-
 3 files changed, 66 insertions(+), 6 deletions(-)

diff --git a/Makefile b/Makefile
index 3df03f7..6997b19 100644
--- a/Makefile
+++ b/Makefile
@@ -68,7 +68,6 @@ clean:
 	@$(MAKE) -C $(TESTDIR) $@ > $(VOID)
 	@$(MAKE) -C $(LZ4DIR) $@ > $(VOID)
 	@$(MAKE) -C examples $@ > $(VOID)
-	@$(MAKE) -C versionsTest $@ > $(VOID)
 	@$(RM) lz4$(EXT)
 	@echo Cleaning completed
 
@@ -113,7 +112,7 @@ armtest: clean
 	CFLAGS="-O3 -Werror" $(MAKE) -C $(TESTDIR) bins CC=arm-linux-gnueabi-gcc
 
 versionsTest: clean
-	$(MAKE) -C versionsTest
+	$(MAKE) -C $(TESTDIR) $@
 
 examples:
 	$(MAKE) -C $(LZ4DIR)
diff --git a/programs/README.md b/programs/README.md
index a952c2f..7a5d2e2 100644
--- a/programs/README.md
+++ b/programs/README.md
@@ -1,6 +1,67 @@
-This directory `programs` contains source files
-to generate `lz4` command line utility,
-and many test tools, such as `fuzzer`, `fullbench` and such.
+Command Line Interface for LZ4 library
+============================================
+
+Command Line Interface (CLI) can be created using the `make` command without any additional parameters.
+There are however other Makefile targets that create different variations of CLI:
+- `lz4` : default CLI supporting gzip-like arguments
+- `lz4c` : Same as `lz4` with additional support for decompression of legacy lz4 versions
+- `lz4c32` : Same as `lz4c`, but forced to compile in 32-bits mode
+
+
+#### Aggregation of parameters
+CLI supports aggregation of parameters i.e. `-b1`, `-e18`, and `-i1` can be joined into `-b1e18i1`. 
+
+
+
+#### Benchmark in Command Line Interface
+CLI includes in-memory compression benchmark module for lz4.
+The benchmark is conducted using a given filename. 
+The file is read into memory.
+It makes benchmark more precise as it eliminates I/O overhead.
+
+The benchmark measures ratio, compressed size, compression and decompression speed.
+One can select compression levels starting from `-b` and ending with `-e`.
+The `-i` parameter selects a number of iterations used for each of tested levels.
+
+
+
+#### Usage of Command Line Interface
+The full list of options can be obtained with `-h` or `-H` parameter:
+```
+Usage :
+      lz4 [arg] [input] [output]
+
+input   : a filename
+          with no FILE, or when FILE is - or stdin, read standard input
+Arguments :
+ -1     : Fast compression (default)
+ -9     : High compression
+ -d     : decompression (default for .lz4 extension)
+ -z     : force compression
+ -f     : overwrite output without prompting
+ -h/-H  : display help/long help and exit
+
+Advanced arguments :
+ -V     : display Version number and exit
+ -v     : verbose mode
+ -q     : suppress warnings; specify twice to suppress errors too
+ -c     : force write to standard output, even if it is the console
+ -t     : test compressed file integrity
+ -m     : multiple input files (implies automatic output filenames)
+ -l     : compress using Legacy format (Linux kernel compression)
+ -B#    : Block size [4-7](default : 7)
+ -BD    : Block dependency (improve compression ratio)
+--no-frame-crc : disable stream checksum (default:enabled)
+--content-size : compressed frame includes original size (default:not present)
+--[no-]sparse  : sparse mode (default:enabled on file, disabled on stdout)
+Benchmark arguments :
+Benchmark arguments :
+ -b#    : benchmark file(s), using # compression level (default : 1)
+ -e#    : test all compression levels from -bX to # (default: 1)
+ -i#    : iteration loops [1-9](default : 3), benchmark mode only
+ ```
+
+#### License
 
 All files in this directory are licensed under GPL-v2.
 See [COPYING](COPYING) for details.
diff --git a/tests/Makefile b/tests/Makefile
index 824f7f3..d7a195a 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -37,7 +37,7 @@ BINDIR  := $(PREFIX)/bin
 MANDIR  := $(PREFIX)/share/man/man1
 LZ4DIR  := ../lib
 PRGDIR  := ../programs
-TESTDIR := lz4test
+TESTDIR := versionsTest
 PYTHON?= python3
 
 CFLAGS  ?= -O3   # can select custom flags. For example : CFLAGS="-O2 -g" make
-- 
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