#!/bin/sh

if test "$#" -ne 2; then
   echo 1>&2 "Usage: $0 infile outdevice"
   exit 1
fi

if ! test -e $1; then
   echo 1>&2 "$0: input file $1 is not exists"
   exit 1
fi

if ! test -f $1; then
   echo 1>&2 "$0: input file $1 is not regular file"
   exit 1
fi

if ! test -e $2; then
   echo 1>&2 "$0: output device file $2 is not exists"
   exit 1
fi

if ! test -b $2; then
   echo 1>&2 "$0: output device file $2 is not block special file"
   exit 1
fi

size=`stat --format=%s $1`
msize=$(( $size / 1024 / 1024 ))

tmpfile=tmp.bin
logfile=ddv.log

trap "rm -f $tmpfile" EXIT

res()
{
  if test $? -eq 0; then
     echo "OK"
  else
     echo "failed"
     exit 1
  fi
}

dd_progress=
dd_ver=`dd --version | fgrep 'dd (coreutils)' | cut '-d ' -f3` || true
#echo "dd_ver: $dd_ver"
dd_ver_major=`echo $dd_ver | cut -d. -f2`
#echo "dd_ver_major: $dd_ver_major"
if test "$dd_ver_major" -ge 8; then
   dd_ver_minor=`echo $dd_ver | cut -d. -f2`
   #echo "minor: $dd_ver_minor"
   if test "$dd_ver_minor" -ge 26; then
      dd_progress="status=progress"
   fi
fi
#echo "dd_progress: $dd_progress"

if ! test -w $2; then
   echo 1>&2 "$0: output device file $2 is not writable, Use sudo."
   exit 1
fi

echo -n "Writing   ... "
rm -f $logfile
dd if=$1 of=$2 bs=1M 2>>$logfile
res

echo -n "Unplug card reader ... "
while test -b $2; do sleep 0.1; done
echo "unplugged"

echo -n "Plug card reader in again ... "
while ! test -b $2 -a -r $2; do sleep 0.1; done
echo "plugged"

echo -n "Reading   ... "
rm -f $tmpfile
dd if=$2 of=$tmpfile bs=1M count=$msize 2>>$logfile
res

echo -n "Comparing ... "
cmp --quiet $1 $tmpfile
res

echo "All OK"