Integrate LZ4 library, compress the ramdisk

lz4/tests/test-lz4-contentSize.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+
+FPREFIX="tmp-lzc"
+
+set -e
+
+remove () {
+    rm $FPREFIX*
+}
+
+trap remove EXIT
+
+set -x
+
+datagen -g15M > $FPREFIX
+lz4 -v $FPREFIX -c | lz4 -t
+lz4 -v --content-size $FPREFIX -c | lz4 -d > $FPREFIX-dup
+diff $FPREFIX $FPREFIX-dup
+lz4 -f $FPREFIX -c > $FPREFIX.lz4 # compressed with content size
+lz4 --content-size $FPREFIX -c > $FPREFIX-wcz.lz4
+diff $FPREFIX.lz4 $FPREFIX-wcz.lz4 && exit 1 # must differ, due to content size
+lz4 --content-size < $FPREFIX > $FPREFIX-wcz2.lz4 # can determine content size because stdin is just a file
+diff $FPREFIX-wcz.lz4 $FPREFIX-wcz2.lz4  # both must contain content size
+cat $FPREFIX | lz4 > $FPREFIX-ncz.lz4
+diff $FPREFIX.lz4 $FPREFIX-ncz.lz4  # both don't have content size
+cat $FPREFIX | lz4 --content-size > $FPREFIX-ncz2.lz4 # can't determine content size
+diff $FPREFIX.lz4 $FPREFIX-ncz2.lz4  # both don't have content size