vfcompr

#! /bin/sh
#
# File (de)compression helper script. Used by vfile library when external 
# (de)compression requested ("vfile external compress" config option).
#

PATH="/bin:/sbin:/usr/bin:/usr/sbin"

compr() {
    typeset src=$1
    typeset dest=$2

    cmd="bzip2 --stdout ${src}"
    if echo ${dest} | egrep ".gz" >/dev/null; then
        cmd="gzip -9nf --stdout ${src}"
    fi
    echo "$cmd > $dest"
    $cmd > $dest && rm -f $src
}

uncompr() {
    typeset src=$1
    typeset dest=$2

    md5file="${dest}-vfcompr.md5"
    #echo "$md5file"
    if [ -f $dest -a -f "$md5file" ]; then
        #echo md5sum --check "$md5file"
        md5sum --check "$md5file"
        if [ $? -eq 0 ]; then
            echo "$src already decompressed"
            exit 0
        fi
    fi

    cmd="bunzip2 --keep --stdout ${src}"
    if echo ${src} | egrep ".gz" >/dev/null; then
        cmd="gunzip --stdout ${src}"
    fi
    rm -f "$dest"
    echo "$cmd > $dest"
    #echo -e "$cmd\n -> ${dest}"
    $cmd > ${dest} && md5sum $src $dest > $md5file
    
}

usage() {
    echo "usage: `basename $0` FILE DESTFILE[.gz][.bz2]"
    echo "       `basename $0` -d FILE DESTFILE[.gz][.bz2]"
}

if [ "$#" -lt 2 ]; then
    usage
    exit 0
fi

echo "$0: $@"
un=$1
if [ "$un" == "-d" ]; then
    src=$2
    if [ "$#" -lt 3 ]; then
        usage
        exit 1
    fi
    dest=$3
else 
    src=$1
    dest=$2
    un=""
fi


#if [ ! -r $src -o ! -f $src ]; then
#   echo "$src: no such file"
#   exit 1
#fi	

#if [ -r $dest ]; then
#    echo "$dest: file exists"
#    exit 1
#fi


if [ $dest == $src ]; then
    echo "dest and src are the same"
    exit 1
fi

if [ -z "$un" ]; then
    compr $src $dest
else 
    uncompr $src $dest
fi