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import io
import struct
import unittest
import zstandard as zstd
from .common import (
CustomBytesIO,
)
class TestCompressor_copy_stream(unittest.TestCase):
def test_no_read(self):
source = object()
dest = io.BytesIO()
cctx = zstd.ZstdCompressor()
with self.assertRaises(ValueError):
cctx.copy_stream(source, dest)
def test_no_write(self):
source = io.BytesIO()
dest = object()
cctx = zstd.ZstdCompressor()
with self.assertRaises(ValueError):
cctx.copy_stream(source, dest)
def test_empty(self):
source = io.BytesIO()
dest = io.BytesIO()
cctx = zstd.ZstdCompressor(level=1, write_content_size=False)
r, w = cctx.copy_stream(source, dest)
self.assertEqual(int(r), 0)
self.assertEqual(w, 9)
self.assertEqual(
dest.getvalue(), b"\x28\xb5\x2f\xfd\x00\x00\x01\x00\x00"
)
def test_large_data(self):
source = io.BytesIO()
for i in range(255):
source.write(struct.Struct(">B").pack(i) * 16384)
source.seek(0)
dest = io.BytesIO()
cctx = zstd.ZstdCompressor()
r, w = cctx.copy_stream(source, dest)
self.assertEqual(r, 255 * 16384)
self.assertEqual(w, 1029)
params = zstd.get_frame_parameters(dest.getvalue())
self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
self.assertEqual(params.window_size, 2097152)
self.assertEqual(params.dict_id, 0)
self.assertFalse(params.has_checksum)
def test_write_checksum(self):
source = io.BytesIO(b"foobar")
no_checksum = io.BytesIO()
cctx = zstd.ZstdCompressor(level=1)
cctx.copy_stream(source, no_checksum)
source.seek(0)
with_checksum = io.BytesIO()
cctx = zstd.ZstdCompressor(level=1, write_checksum=True)
cctx.copy_stream(source, with_checksum)
self.assertEqual(
len(with_checksum.getvalue()), len(no_checksum.getvalue()) + 4
)
no_params = zstd.get_frame_parameters(no_checksum.getvalue())
with_params = zstd.get_frame_parameters(with_checksum.getvalue())
self.assertEqual(no_params.content_size, zstd.CONTENTSIZE_UNKNOWN)
self.assertEqual(with_params.content_size, zstd.CONTENTSIZE_UNKNOWN)
self.assertEqual(no_params.dict_id, 0)
self.assertEqual(with_params.dict_id, 0)
self.assertFalse(no_params.has_checksum)
self.assertTrue(with_params.has_checksum)
def test_write_content_size(self):
source = io.BytesIO(b"foobar" * 256)
no_size = io.BytesIO()
cctx = zstd.ZstdCompressor(level=1, write_content_size=False)
cctx.copy_stream(source, no_size)
source.seek(0)
with_size = io.BytesIO()
cctx = zstd.ZstdCompressor(level=1)
cctx.copy_stream(source, with_size)
# Source content size is unknown, so no content size written.
self.assertEqual(len(with_size.getvalue()), len(no_size.getvalue()))
source.seek(0)
with_size = io.BytesIO()
cctx.copy_stream(source, with_size, size=len(source.getvalue()))
# We specified source size, so content size header is present.
self.assertEqual(len(with_size.getvalue()), len(no_size.getvalue()) + 1)
no_params = zstd.get_frame_parameters(no_size.getvalue())
with_params = zstd.get_frame_parameters(with_size.getvalue())
self.assertEqual(no_params.content_size, zstd.CONTENTSIZE_UNKNOWN)
self.assertEqual(with_params.content_size, 1536)
self.assertEqual(no_params.dict_id, 0)
self.assertEqual(with_params.dict_id, 0)
self.assertFalse(no_params.has_checksum)
self.assertFalse(with_params.has_checksum)
def test_read_write_size(self):
source = CustomBytesIO(b"foobarfoobar")
dest = CustomBytesIO()
cctx = zstd.ZstdCompressor()
r, w = cctx.copy_stream(source, dest, read_size=1, write_size=1)
self.assertEqual(r, len(source.getvalue()))
self.assertEqual(w, 21)
self.assertEqual(source._read_count, len(source.getvalue()) + 1)
self.assertEqual(dest._write_count, len(dest.getvalue()))
def test_multithreaded(self):
source = io.BytesIO()
source.write(b"a" * 1048576)
source.write(b"b" * 1048576)
source.write(b"c" * 1048576)
source.seek(0)
dest = io.BytesIO()
cctx = zstd.ZstdCompressor(threads=2, write_content_size=False)
r, w = cctx.copy_stream(source, dest)
self.assertEqual(r, 3145728)
self.assertEqual(w, 111)
params = zstd.get_frame_parameters(dest.getvalue())
self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
self.assertEqual(params.dict_id, 0)
self.assertFalse(params.has_checksum)
# Writing content size and checksum works.
cctx = zstd.ZstdCompressor(threads=2, write_checksum=True)
dest = io.BytesIO()
source.seek(0)
cctx.copy_stream(source, dest, size=len(source.getvalue()))
params = zstd.get_frame_parameters(dest.getvalue())
self.assertEqual(params.content_size, 3145728)
self.assertEqual(params.dict_id, 0)
self.assertTrue(params.has_checksum)
def test_bad_size(self):
source = io.BytesIO()
source.write(b"a" * 32768)
source.write(b"b" * 32768)
source.seek(0)
dest = io.BytesIO()
cctx = zstd.ZstdCompressor()
with self.assertRaisesRegex(zstd.ZstdError, "Src size is incorrect"):
cctx.copy_stream(source, dest, size=42)
# Try another operation on this compressor.
source.seek(0)
dest = io.BytesIO()
cctx.copy_stream(source, dest)
def test_read_exception(self):
source = CustomBytesIO(b"foo" * 1024)
dest = CustomBytesIO()
source.read_exception = IOError("read")
cctx = zstd.ZstdCompressor()
with self.assertRaisesRegex(IOError, "read"):
cctx.copy_stream(source, dest)
def test_write_exception(self):
source = CustomBytesIO(b"foo" * 1024)
dest = CustomBytesIO()
dest.write_exception = IOError("write")
cctx = zstd.ZstdCompressor()
with self.assertRaisesRegex(IOError, "write"):
cctx.copy_stream(source, dest)
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