Fun with binary/hex data

binary_processing.sh

# https://stackoverflow.com/a/2615112/865719
# https://stackoverflow.com/a/7826789/865719
# https://stackoverflow.com/q/2764051/865719

# echo -n 'Hello' | tohex
# tohex INPUT_FILE
function tohex() { hexdump -ve '1/1 "%.2x"' "$@" ; }
function todec() { hexdump -ve '1/1 "%.3d"' "$@" ; }
function tobin() {
    xxd -b "$@" | cut -d" " -f2-7 | tr -d ' ' | tr -d '\n'
}

# fromhex INPUT_FILE [OUTPUT_FILE]
# echo -n 'Hello' | tohex | fromhex [OUTPUT_FILE]
function fromhex() {
    if [ -t 0 ] ; then  # not piping
        xxd -r -p "$@"
    else
        xxd -r -p - "$@"
    fi
}