#RETR $FISH_FILENAME $FISH_START_OFFSET
LC_TIME=C
export LC_TIME
fish_get_perl ()
{
FILENAME=$1
OFFSET=$2
perl -e '
use strict;
use POSIX;
use Fcntl;
my $filename = $ARGV[0];
my $pos = $ARGV[1];
my $content;
my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks) = lstat("$filename");
my $n;
if (open IFILE,$filename) {
    if ($size<$pos) {
        printf("0\n");
    } else {
        $size-=$pos;
        printf("$size\n");
    }
    printf("### 100\n");
    seek (IFILE, $pos, 0);
    while ($n = read(IFILE,$content,$blksize)!= 0) {
        print $content;
    }
    close IFILE;
    printf("### 200\n");
} else {
    printf("### 500\n");
}
exit 0
' "${FILENAME}" $OFFSET
}

fish_get_tail ()
{
FILENAME=$1
OFFSET=$2
LC_TIME=C
export LC_TIME
if dd if="${FILENAME}" of=/dev/null bs=1 count=1 2>/dev/null ; then
    file_size=`ls -ln "${FILENAME}" 2>/dev/null | (
       read p l u g s r
       echo $s
    )`
    if [ $OFFSET -gt 0 ]; then
        file_size=`expr $file_size - $OFFSET`
        OFFSET=`expr $OFFSET + 1`
    fi
    if [ $file_size -gt 0 ]; then
        echo $file_size
    else
        echo 0
    fi
    echo "### 100"
    if [ $OFFSET -gt 0 ]; then
        tail -c +${OFFSET} "${FILENAME}"
    else
        cat "${FILENAME}"
    fi
    echo "### 200"
else
    echo "### 500"
fi
}

fish_get_dd ()
{
FILENAME=$1
OFFSET=$2
LC_TIME=C
export LC_TIME
if dd if="${FILENAME}" of=/dev/null bs=1 count=1 2>/dev/null ; then
    file_size=`ls -ln "${FILENAME}" 2>/dev/null | (
       read p l u g s r
       echo $s
    )`
    file_size=`expr $file_size - $OFFSET`
    if [ $file_size -gt 0 ]; then
        echo $file_size
    else
        echo 0
    fi
    echo "### 100"
    if [ $OFFSET -gt 0 ]; then
        dd skip=$OFFSET ibs=1 if="${FILENAME}" 2>/dev/null
    else
        cat "${FILENAME}"
    fi
    echo "### 200"
else
    echo "### 500"
fi
}

if [ -n "${FISH_HAVE_PERL}" ]; then
    fish_get_perl "/${FISH_FILENAME}" ${FISH_START_OFFSET}
elif [ -n "${FISH_HAVE_TAIL}" ]; then
    fish_get_tail "/${FISH_FILENAME}" ${FISH_START_OFFSET}
else
    fish_get_dd "/${FISH_FILENAME}" ${FISH_START_OFFSET}
fi