webp2jpg

webp2jpg.sh

#!/bin/bash

for file in `ls`
do
  len3=`xxd -p -l 3 $file`
  len4=`xxd -p -l 4 $file`

  echo -n $file

  if [ $len3 == "ffd8ff" ]; then
    echo " is jpg"
  elif [ $len4 == "89504e47" ]; then
    echo " is png"
  elif [ $len4 == "47494638" ]; then
    echo " is gif"
  elif [ $len4 == "52494646" ]; then
    echo " is webp"
    if [ ! -e $file.jpg ]; then
      echo "===== convert $file ====="
      dwebp $file -o $file.png
      convert "$file.png" "$file.jpg"
      rm $file.png
    fi
  else
    echo " is others"
  fi
done