#!/bin/sh

function usage {
    echo 'Usage: jpegtran-rotate-lossless.sh <90|180|270> <file>'
    exit 1
}

ROTATION=$1
FILE=$2

if [ $# -ne 2 ]; then
    usage
fi

case $ROTATION in
    90|180|270)
        true ;;
    *)
        usage ;;
esac

jpegtran -rotate $ROTATION -trim -copy all $FILE > $FILE-rotate
if [ $? -ne 0 ]; then
    echo 'jpegtran-rotate-lossless.sh: jpegtran failed'
    exit 1
fi

mv $FILE-rotate $FILE
if [ $? -ne 0 ]; then
    'jpegtran-rotate-lossless.sh: mv failed'
    exit 1
fi

exit 0