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#!/bin/sh
# extract file name and arguments from command line. File name
# is supposed to be the last one, if it doesn't exist, then it
# is assumed to be another argument.
FILE=
ARGS=
GRAYSCALE=
for arg in "$@"; do
if [ "$arg" = "-gray" ]; then
GRAYSCALE=1
else
ARGS="$ARGS $FILE"
FILE=$arg;
fi
done
# we're reading from STDIN, store it into a temporary file
temp=0
if test -z "$FILE" -o ! -f "$FILE" ; then
ARGS="$ARGS $FILE"
FILE=`mktemp --tmpdir imagetops.XXXXXX` || exit 1
cat > "$FILE"
temp=1
fi
# check the file mime type, and set the command correspondingly
cmd=
magic=`file -bi "$FILE"`
magicbase=`echo $magic | cut -f 1 -d "/"`
magictype=`echo $magic | cut -f 2- -d "/" | cut -f 1 -d ";"`
if test "$magicbase" != "image" ; then
echo "Not an image"
exit 1;
fi
case $magictype in
jpeg)
cmd="jpegtopnm"
;;
png|x-png)
cmd="pngtopnm"
;;
bmp|x-bmp)
cmd="bmptoppm"
;;
gif)
cmd="giftopnm"
;;
tiff)
cmd="tifftopnm"
;;
*)
echo "Unsupported image type: $magic"
exit 1
;;
esac
# executing command
if [ "$GRAYSCALE" = "1" ]; then
exec $cmd "$FILE" | ppmtopgm | pnmtops $ARGS
else
exec $cmd "$FILE" | pnmtops $ARGS
fi
# removing temporary file
if test "$temp" = "1"; then
rm -f "$FILE"
fi
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