android unzipdir.sh

#! /system/bin/sh
#unzipdir
#Version 2
#safely extracts the zip equivalent of tarbombs
#v2 works on zipfiles with extensions other than .zip (like .xpi and some .cbr files)
#By Wyatt Ward, but with some things snatched from stack exchange answers
#Requires info-zip
export INFILENAME=`echo "$@" | busybox awk -F/ '$0=$NF'` #Looking back, i forget exactly what this does, but I think it cuts out a path.
export INFILEBASENAME=$(busybox basename "$INFILENAME")
export INFILEEXTENSION="${INFILEBASENAME##*.}" #not sure how it works. thanks stack exchange

#original v1 line:
#export OUTPUTDIR=`echo "$INFILENAME" | sed 's/.zip//g'`
#new v2 line:
export OUTPUTDIR=`echo "$INFILENAME" | sed "s/.$INFILEEXTENSION//g"`

echo "OUTPUTDIR is"
echo "$OUTPUTDIR"
export STARTINGDIR="$PWD"
if [ -f "$1" ]
then
        echo "Found file."
        mkdir "$OUTPUTDIR"
        cd "$OUTPUTDIR"
        if [ `echo "$1" | grep [/]` ]
        then
#leading slash present, no need to find actual paths
                unzip "$1"
        else
#no slash present, be paranoid and do it the harder way
                unzip "$STARTINGDIR/$1"
        fi
else
        echo "$1 not found. Sorry."
fi