#!/usr/bin/env python3

import struct
import os
#from pathlib import Path

def unpack_one_file(fin, dir_out):
    file_hdr = fin.read(8)
    (fname_len, fdata_len) = struct.unpack('ii', file_hdr)
    fname = fin.read(fname_len)
    fdata = fin.read(fdata_len)

    fname = fname[0:fname_len-1]
    fname = fname.decode("utf-8")
    print("File name %s length=%d" % (fname, fdata_len))
    path_dir = Path(fname).parent
    unpack_dir = os.path.join(dir_out, path_dir)
    out_fname = os.path.join(dir_out, fname)
    try:
        os.makedirs(unpack_dir)
    except FileExistsError as e:
        pass

    with open(out_fname, "wb") as fout:
        fout.write(fdata)

def unpack_files(fin, num_files, dir_out):
    for i in range(num_files):
        unpack_one_file(fin, dir_out)

def unpack_tzar(fname, dir_out):
    with open(fname, "rb") as fin:
        hdr = fin.read(16)
        (magic, tzar_count, tzar_len, tzar_num_files) = struct.unpack('iiii', hdr)
        print(hex(magic))
        print("Total number of files: " + str(tzar_num_files))
        unpack_files(fin, tzar_num_files, dir_out)

if __name__ == "__main__":
    fname_in = "tzar"
    dir_out = "tzar_out"
    unpack_tzar(fname_in, dir_out)