#!/bin/bash

function convUTF16() {
  n=`echo $((0x$1-0x10000))`
  nn=$n
  if [ $n -lt 0 ]; then
    nn=`echo $((0x$1))`
  fi
  echo $nn
}

FILES=`find -maxdepth 1 -type f -not -name '*-*.bmp' -and -name '*.bmp'`
OUTPUT="output"

for FILE in ${FILES}
do
  if [ ! -e $FILE ];
  then
    echo "$FILEが存在しない"
    continue
  fi
  FILE2=`basename $FILE .bmp`

  HEXFILE=`convUTF16 $FILE2`
  BINARY=`echo "obase=2;$HEXFILE" | bc`
  BINARY=`printf "%020d" $BINARY`
  W1B=`echo ${BINARY:0:10}`
  W2B=`echo ${BINARY:10:10}`
  W1B="110110$W1B"
  W2B="110111$W2B"
  W1=`echo "obase=16; ibase=2; $W1B" | bc`
  W2=`echo "obase=16; ibase=2; $W2B" | bc`
  W1=`echo ${W1,,}`
  W2=`echo ${W2,,}`
  echo "$FILE -> $HEXFILE -> $BINARY -> $W1B $W2B -> $W1 $W2" # ファイル名を出力
  cp $FILE $OUTPUT/$W1$W2.bmp
done