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import shutil
import sys
import unittest
from io import BytesIO
from pathlib import Path
from secrets import token_bytes, token_urlsafe
from tempfile import TemporaryDirectory
if sys.version_info >= (3, 14):
from compression import zstd
import tarfile
import zipfile
else:
from backports import zstd
from backports.zstd import register_shutil, tarfile, zipfile
register_shutil()
if sys.version_info >= (3, 11):
from typing import assert_type
else:
assert_type = lambda *_: None
# these tests are simple checks for main use cases
# to make sure they work with the conditional import in 3.14 as well
class TestCompat(unittest.TestCase):
def test_compress_decompress(self) -> None:
raw = token_bytes(1_000)
assert_type(raw, bytes)
compressed = zstd.compress(raw)
assert_type(compressed, bytes)
decompressed = zstd.decompress(compressed)
assert_type(decompressed, bytes)
self.assertEqual(decompressed, raw)
def test_zstdfile(self) -> None:
raw = token_bytes(1_000)
fobj = BytesIO()
with zstd.ZstdFile(fobj, "w") as fzstd:
fzstd.write(raw)
self.assertTrue(fobj.tell() > 0)
fobj.seek(0)
with zstd.ZstdFile(fobj) as fzstd:
data = fzstd.read()
assert_type(data, bytes)
self.assertEqual(data, raw)
self.assertTrue(fobj.tell() > 0)
def test_open(self) -> None:
raw = token_bytes(1_000)
fobj = BytesIO()
with zstd.open(fobj, "w") as fzstd:
fzstd.write(raw)
self.assertTrue(fobj.tell() > 0)
fobj.seek(0)
with zstd.open(fobj) as fzstd:
data = fzstd.read()
assert_type(data, bytes)
self.assertEqual(data, raw)
self.assertTrue(fobj.tell() > 0)
def test_open_binary(self) -> None:
raw = token_bytes(1_000)
fobj = BytesIO()
with zstd.open(fobj, "wb") as fzstd:
fzstd.write(raw)
self.assertTrue(fobj.tell() > 0)
fobj.seek(0)
with zstd.open(fobj, "rb") as fzstd:
data = fzstd.read()
assert_type(data, bytes)
self.assertEqual(data, raw)
self.assertTrue(fobj.tell() > 0)
def test_open_text(self) -> None:
raw = token_urlsafe(1_000)
fobj = BytesIO()
with zstd.open(fobj, "wt") as fzstd:
fzstd.write(raw)
self.assertTrue(fobj.tell() > 0)
fobj.seek(0)
with zstd.open(fobj, "rt") as fzstd:
data = fzstd.read()
assert_type(data, str)
self.assertEqual(data, raw)
self.assertTrue(fobj.tell() > 0)
def test_tarfile(self) -> None:
raw = token_bytes(1_000)
raw_name = token_urlsafe(10)
with TemporaryDirectory() as tmpfile:
path = Path(tmpfile) / "archive.tar.zst"
with tarfile.open(path, "w:zst") as tf:
ti = tarfile.TarInfo(raw_name)
ti.size = len(raw)
tf.addfile(ti, BytesIO(raw))
with tarfile.open(path) as tf:
self.assertEqual(tf.getnames(), [raw_name])
extracted = tf.extractfile(raw_name)
assert extracted is not None # for type checkers
with extracted as fobj:
self.assertEqual(fobj.read(), raw)
shutil.unpack_archive(path, tmpfile)
self.assertEqual((Path(tmpfile) / raw_name).read_bytes(), raw)
def test_zipfile(self) -> None:
raw = token_bytes(1_000)
raw_name = token_urlsafe(10)
with TemporaryDirectory() as tmpfile:
path = Path(tmpfile) / "archive.zip"
with zipfile.ZipFile(path, "w") as zf:
zf.writestr(raw_name, raw, zipfile.ZIP_ZSTANDARD)
with zipfile.ZipFile(path) as zf:
self.assertEqual(zf.namelist(), [raw_name])
self.assertEqual(zf.read(raw_name), raw)
shutil.unpack_archive(path, tmpfile)
self.assertEqual((Path(tmpfile) / raw_name).read_bytes(), raw)
def test_shutil_make_archive(self) -> None:
raw = token_bytes(1_000)
raw_name = token_urlsafe(10)
with TemporaryDirectory() as tmpfile:
path_src = Path(tmpfile) / "src"
path_src.mkdir()
(path_src / raw_name).write_bytes(raw)
path_dst = Path(tmpfile) / "archive"
shutil.make_archive(path_dst.as_posix(), "zstdtar", path_src)
with path_dst.with_suffix(".tar.zst").open("rb") as f:
self.assertEqual(f.read(4), bytes.fromhex("28 b5 2f fd"))
if __name__ == "__main__":
unittest.main()
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