#!/bin/bash

in="${1:-/lib/libc.so.6}"
size="${2:-500}"
chunksize="${3:-50}"
ref="refdata"
out="outdata"

echo "Creating reference data ..."
dd if="$in" of="$ref" bs=1 count="$size" status=noxfer

echo "Create chunk files ..."
split -b $chunksize -d "$ref" CHUNK

echo "Starting ./gluefile -s $size $out ..."
./gluefile -s $size $out &
pid=$!
echo "  done (pid=$pid)"

ps -p $pid >/dev/null
status=$?
while [ $status -eq 0 ]
do
  let "num = $RANDOM % ($size/$chunksize)"
  let "offset = $num * $chunksize"
  echo "Executing ./insertfile -o $offset CHUNK$num ..."
  num2=$(printf "%02d" $num)
  ./insertfile -o $offset CHUNK$num2

  ps -p $pid >/dev/null
  status=$?
done
echo "done..."

echo "Checking MD5SUMs ..."
if [ "$(md5sum < $ref)" = "$(md5sum < $out)" ]
then
  echo "-> SUCCESS"
  rm -f "$ref" "$out" CHUNK*
else
  echo "-> FAILURE"
  exit 1
fi