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Add lzma.{encode,decode}_filter_properties().

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This commit is contained in:
Nadeem Vawda 2012-05-06 23:01:27 +02:00
parent 75d5d8c781
commit f55b329edc
4 changed files with 252 additions and 4 deletions
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43
Lib/test/test_lzma.py
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@ -944,6 +944,49 @@ class MiscellaneousTestCase(unittest.TestCase):
# This value should not be a valid check ID.
self.assertFalse(lzma.check_is_supported(lzma.CHECK_UNKNOWN))
def test_encode_filter_properties(self):
with self.assertRaises(TypeError):
lzma.encode_filter_properties(b"not a dict")
with self.assertRaises(ValueError):
lzma.encode_filter_properties({"id": 0x100})
with self.assertRaises(ValueError):
lzma.encode_filter_properties({"id": lzma.FILTER_LZMA2, "junk": 12})
with self.assertRaises(lzma.LZMAError):
lzma.encode_filter_properties({"id": lzma.FILTER_DELTA,
"dist": 9001})
# Test with parameters used by zipfile module.
props = lzma.encode_filter_properties({
"id": lzma.FILTER_LZMA1,
"pb": 2,
"lp": 0,
"lc": 3,
"dict_size": 8 << 20,
})
self.assertEqual(props, b"]\x00\x00\x80\x00")
def test_decode_filter_properties(self):
with self.assertRaises(TypeError):
lzma.decode_filter_properties(lzma.FILTER_X86, {"should be": bytes})
with self.assertRaises(lzma.LZMAError):
lzma.decode_filter_properties(lzma.FILTER_DELTA, b"too long")
# Test with parameters used by zipfile module.
filterspec = lzma.decode_filter_properties(
lzma.FILTER_LZMA1, b"]\x00\x00\x80\x00")
self.assertEqual(filterspec["id"], lzma.FILTER_LZMA1)
self.assertEqual(filterspec["pb"], 2)
self.assertEqual(filterspec["lp"], 0)
self.assertEqual(filterspec["lc"], 3)
self.assertEqual(filterspec["dict_size"], 8 << 20)
def test_filter_properties_roundtrip(self):
spec1 = lzma.decode_filter_properties(
lzma.FILTER_LZMA1, b"]\x00\x00\x80\x00")
reencoded = lzma.encode_filter_properties(spec1)
spec2 = lzma.decode_filter_properties(lzma.FILTER_LZMA1, reencoded)
self.assertEqual(spec1, spec2)
# Test data: