ebook2pdf.sh

#!/bin/bash

if [ -z "$1" ]
then
    echo "Usage: ebook2pdf.sh FILENAME WIDTH HEIGHT OVERLAP ROTATE DEPTH"
    exit 1
fi

date

FILENAME=$(basename $1)
FILEEXT=`echo "${FILENAME##*.}"|tr '[A-Z]' '[a-z]'`

SRCDIR="."
RAMDIR="/tmp/ramfs"
RAMSIZE="1M"

FULLNAME="$SRCDIR"/"$FILENAME"
FILEID=`md5sum -b "$FULLNAME"|cut -f 1 -d ' '`
mkdir "./ready" &>/dev/null
RESDIR="./ready/$FILEID"


if [ `mount | grep -c "$RAMDIR"` -eq 0 ]
then
    mkdir "$RAMDIR" &>/dev/null
    chmod 777 "$RAMDIR" &>/dev/null
    mount -t ramfs -o size="$RAMSIZE" tmpfs "$RAMDIR" &>/dev/null
    echo "RAM Drive created"
else
    echo "RAM Drive already exists"
fi

rm "$RAMDIR"/"$FILEID"-buf* &>/dev/null
rm -r $RESDIR &>/dev/null
mkdir $RESDIR &>/dev/null
rm $FILENAME.pdf &>/dev/null

OUTBUF1="$RAMDIR"/"$FILEID"-buf1
INBUF1="$RAMDIR"/"$FILEID"-buf1.pgm
OUTBUF2="$RAMDIR"/"$FILEID"-buf2
INBUF2="$RAMDIR"/"$FILEID"-buf2.gray
OUTBUF3="$RAMDIR"/"$FILEID"-buf3
SLIDEBUF="$RAMDIR"/"$FILEID"-buf3.gray

WIDTH=$2
HEIGHT=$3
OVER=$4
ROTATE=$5
BITS=$6

if [ "$FILEEXT" = "pdf" ]
then
    PAGES=`pdfinfo "$FULLNAME" | grep "Pages:\s*" | grep -o [0-9]*`
elif [ "$FILEEXT" = "djvu" ]
then
    PAGES=`djvm -l "$FULLNAME" | grep "PAGE" -c`
else
    echo "Format not supported"
    exit 1
fi

echo "Starting $FILENAME"
echo "Type: $FILEEXT"
echo "Checksum: $FILEID"
echo "Width: $WIDTH"
echo "Height: $HEIGHT"
echo "Overlapping: $OVER"
echo "Rotate: $ROTATE"
echo "Bit-depth: $BITS"
echo "Pages: $PAGES"

PAGE=0
SLIDE=-1

touch "$OUTBUF3"

while true
do

    # import

    if [ "$PAGE" -lt "$PAGES" ]
    then
        PAGE=$(( $PAGE+1 ))
        if [ "$FILEEXT" = "pdf" ]
        then
            pdftoppm -gray -r 300 -f "$PAGE" -l "$PAGE" "$FULLNAME" >"$OUTBUF1" && echo "$FILENAME >> Page                       $PAGE" &
        elif [ "$FILEEXT" = "djvu" ]
        then
            ddjvu -format=pgm -scale=300 -page=$PAGE "$FULLNAME" >"$OUTBUF1" && echo "$FILENAME >>Page                        $PAGE" &
        fi
    else
        rm "$OUTBUF1" &>/dev/null
    fi

    #process

    if [ -e "$INBUF1" ]
    then
        convert "$INBUF1" -fuzz 1% -trim +repage -resize $WIDTH -bordercolor white -border 0x10 -bordercolor black -border 0x5 -type GrayScale -depth 8 gray:"$OUTBUF2" &
    else
        rm "$OUTBUF2" &>/dev/null
    fi

    # export

    if [ -e "$INBUF2" ]
    then
        :>"$OUTBUF3"
        ITER=-1

        while true
        do
            ITER=$(( $ITER+1 ))
            SKIP=$(( $ITER*$(($HEIGHT-$OVER)) ))
            dd status=noxfer if="$INBUF2" skip=$SKIP count=$HEIGHT bs=$WIDTH of="$SLIDEBUF" &>/dev/null
            if [ `stat -c %s "$SLIDEBUF"` -eq $(($WIDTH*$HEIGHT)) ]
            then
                SLIDE=$(( $SLIDE+1 ))
                convert -size $(($WIDTH))x$(($HEIGHT)) -depth 8 "$SLIDEBUF" -rotate $ROTATE +repage -strip -type GrayScale -depth $BITS -compress Zip -quality 100 "$RESDIR"/$(printf %04d $SLIDE).pdf && echo "$FILENAME ++ Slide $SLIDE"
            else
                cat "$SLIDEBUF" >"$OUTBUF3"
                break
            fi
        done

    fi

    wait

    # read results

    if [ -e "$OUTBUF1" ]
    then
        cat "$OUTBUF1" >"$INBUF1"
    else
        rm "$INBUF1" &>/dev/null
    fi

    cat "$OUTBUF3" >"$INBUF2"

    if [ -e "$OUTBUF2" ]
    then
        cat "$OUTBUF2" >>"$INBUF2"
    fi

    # exit

    if [[ ! -e "$OUTBUF1" ]] && [[ ! -e "$OUTBUF2" ]]
    then
        # last slide - weird approach
        if [[ -s $INBUF2 ]]
        then
            SLIDE=$(( $SLIDE+1 ))
            convert -size $(($WIDTH))x$(($HEIGHT)) -depth 8 "$SLIDEBUF" -rotate $ROTATE +repage -strip -type GrayScale -depth $BITS -compress Zip -quality 100 "$RESDIR"/$(printf %04d $SLIDE).pdf && echo "$FILENAME ++ Slide $SLIDE"
        fi

        pdftk "$RESDIR"/*.pdf cat output $FILENAME.pdf
        rm -r $RESDIR &>/dev/null

        rm "$RAMDIR"/* &>/dev/null
        umount $RAMDIR

        echo "Done!"
        date

        exit 0
    fi

done