#!/bin/bash
#
# Quick and dirty extracter to slice out a section of a binary file
# Copyright (C) 2016 Hamish Coleman
#
# TODO:
# - a tool that is portable to Windows
# - should output dependancy information

INFOFILE="$1"
if [ ! -r "$INFOFILE" ]; then
    echo Need file with source and offset info
    exit 1
fi
shift

OUT="$1"
if [ -z "$OUT" ]; then
    echo Need output filename
    exit 1
fi

read SOURCE OFFSET LENGTH <"$INFOFILE"

set -x

dd iflag=count_bytes,skip_bytes if=$SOURCE skip=$[$OFFSET] count=$[$LENGTH] of="$OUT"