82 lines
2.3 KiB
Python
82 lines
2.3 KiB
Python
#!/usr/bin/python3
|
|
|
|
from os import remove, rename, stat
|
|
from os.path import basename, isfile, splitext
|
|
from shutil import copy
|
|
from sys import argv
|
|
from time import perf_counter
|
|
from zipfile import ZipFile, ZIP_DEFLATED
|
|
|
|
BLOCK_SIZE = 1024
|
|
BLOCK_AMOUNT = 1024**2
|
|
COPIES_AMOUNT = 10
|
|
|
|
get_file_size = lambda filename: stat(filename).st_size
|
|
get_filename_without_extension = lambda name: splitext(basename(name))[0]
|
|
get_file_extension = lambda name: splitext(basename(name))[-1]
|
|
|
|
|
|
def generate_dummy_file(filename, size):
|
|
with open(filename, "wb") as dummy:
|
|
for i in range(BLOCK_SIZE):
|
|
dummy.write((size * BLOCK_AMOUNT) * b"\0")
|
|
|
|
|
|
def compress_file(infile, outfile):
|
|
zf = ZipFile(outfile, mode="w", allowZip64=True)
|
|
zf.write(infile, compress_type=ZIP_DEFLATED)
|
|
zf.close()
|
|
|
|
|
|
def make_copies_and_compress(infile, outfile, n_copies):
|
|
zf = ZipFile(outfile, mode="w", allowZip64=True)
|
|
|
|
for i in range(n_copies):
|
|
f_name = "%s-%d.%s" % (
|
|
get_filename_without_extension(infile),
|
|
i,
|
|
get_file_extension(infile),
|
|
)
|
|
copy(infile, f_name)
|
|
zf.write(f_name, compress_type=ZIP_DEFLATED)
|
|
remove(f_name)
|
|
|
|
zf.close()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
if len(argv) != 3:
|
|
print(f"Usage: { basename(__file__) } <n_levels> <out_zip_file>")
|
|
raise SystemExit
|
|
|
|
n_levels = int(argv[1])
|
|
out_zip_file = argv[2]
|
|
|
|
start_time = perf_counter()
|
|
|
|
dummy_name = "empty.bin"
|
|
level_1_zip = "1.zip"
|
|
generate_dummy_file(dummy_name, 1)
|
|
compress_file(dummy_name, level_1_zip)
|
|
remove(dummy_name)
|
|
|
|
decompressed_size = 1
|
|
|
|
for i in range(1, n_levels + 1):
|
|
make_copies_and_compress("%d.zip" % i, "%d.zip" % (i + 1), COPIES_AMOUNT)
|
|
decompressed_size *= COPIES_AMOUNT
|
|
remove("%d.zip" % i)
|
|
|
|
if isfile(out_zip_file):
|
|
remove(out_zip_file)
|
|
|
|
rename("%d.zip" % (n_levels + 1), out_zip_file)
|
|
|
|
end_time = perf_counter()
|
|
time_diff = end_time - start_time
|
|
compressed_size = get_file_size(out_zip_file)
|
|
decompressed_size *= BLOCK_SIZE * BLOCK_AMOUNT
|
|
print("Compressed file size: %d bytes" % compressed_size)
|
|
print("Decompression file size: %d bytes" % decompressed_size)
|
|
print("Generation time performance: %.15f" % time_diff)
|