forked from Lephenixnoir/PythonExtra
61 lines
1.9 KiB
Python
61 lines
1.9 KiB
Python
try:
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import zlib
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except ImportError:
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try:
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import uzlib as zlib
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except ImportError:
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print("SKIP")
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raise SystemExit
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PATTERNS = [
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# Packed results produced by CPy's zlib.compress()
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(b"0", b"x\x9c3\x00\x00\x001\x001"),
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(b"a", b"x\x9cK\x04\x00\x00b\x00b"),
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(b"0" * 100, b"x\x9c30\xa0=\x00\x00\xb3q\x12\xc1"),
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(
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bytes(range(64)),
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b"x\x9cc`dbfaec\xe7\xe0\xe4\xe2\xe6\xe1\xe5\xe3\x17\x10\x14\x12\x16\x11\x15\x13\x97\x90\x94\x92\x96\x91\x95\x93WPTRVQUS\xd7\xd0\xd4\xd2\xd6\xd1\xd5\xd370426153\xb7\xb0\xb4\xb2\xb6\xb1\xb5\xb3\x07\x00\xaa\xe0\x07\xe1",
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),
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(b"hello", b"x\x01\x01\x05\x00\xfa\xffhello\x06,\x02\x15"), # compression level 0
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# adaptive/dynamic huffman tree
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(
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b"13371813150|13764518736|12345678901",
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b"x\x9c\x05\xc1\x81\x01\x000\x04\x04\xb1\x95\\\x1f\xcfn\x86o\x82d\x06Qq\xc8\x9d\xc5X}<e\xb5g\x83\x0f\x89X\x07\xab",
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),
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# dynamic Huffman tree with "case 17" (repeat code for 3-10 times)
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(
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b">I}\x00\x951D>I}\x00\x951D>I}\x00\x951D>I}\x00\x951D",
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b"x\x9c\x05\xc11\x01\x00\x00\x00\x010\x95\x14py\x84\x12C_\x9bR\x8cV\x8a\xd1J1Z)F\x1fw`\x089",
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),
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]
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for unpacked, packed in PATTERNS:
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assert zlib.decompress(packed) == unpacked
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print(unpacked)
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# Raw DEFLATE bitstream
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v = b"\xcbH\xcd\xc9\xc9\x07\x00"
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exp = b"hello"
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out = zlib.decompress(v, -15)
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assert out == exp
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print(exp)
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# Even when you ask CPython zlib.compress to produce Raw DEFLATE stream,
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# it returns it with adler2 and oriignal size appended, as if it was a
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# zlib stream. Make sure there're no random issues decompressing such.
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v = b"\xcbH\xcd\xc9\xc9\x07\x00\x86\xa6\x106\x05\x00\x00\x00"
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out = zlib.decompress(v, -15)
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assert out == exp
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# this should error
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try:
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zlib.decompress(b"abc")
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except Exception:
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print("Exception")
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# invalid block type
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try:
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zlib.decompress(b"\x07", -15) # final-block, block-type=3 (invalid)
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except Exception as er:
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print("Exception")
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