Stationeers hash function for bash using rhash only

stationeers_hash.sh

# This is free and unencumbered software released into the public domain.
# For more information, please refer to <https://unlicense.org>

stationeers.hash() {
    # Get CRC32 as unsigned 32-bit hex value
    local crc32_hex=$(printf "%s" "$1" | rhash --crc32 - -p '%C')

    # Convert hex to decimal unsigned
    local crc32_dec=$((16#$crc32_hex))

    # Convert to signed 32-bit decimal (matches Python's logic)
    local signed
    if [ $crc32_dec -ge $((0x80000000)) ]; then
        signed=$((crc32_dec - 0x100000000))
    else
        signed=$crc32_dec
    fi

    # Generate hex representation
    if [ "$signed" -lt 0 ]; then
        # Negative: use 64-bit two's complement representation
        # For negative 32-bit values, extend sign to 64-bit
        # The CRC is already the lower 32 bits, just need FFFFFFFF prefix
        echo "\$FFFFFFFF$crc32_hex"
    else
        # Positive: use compact format (uppercase)
        echo "\$$crc32_hex"
    fi

    echo "$signed"
}