Function tw_pack_lib::build_pack_from_memory

pub fn build_pack_from_memory<P: Borrow<PackedFile>>(
    input: &mut Vec<P>,
    output_file: &mut File,
    version: PFHVersion,
    bitmask: PFHFlags,
    file_type: PFHFileType,
    pfh_timestamp: u32,
    pack_files: &[String]
) -> Result<()>

This function tries to create a PackFile in the filesystem from PackedFiles.