cython

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from cython.cimports.libc.stdlib import free
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@cython.cfunc
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def tounicode(s: cython.p_char) -> str:
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    return s.decode('UTF-8', 'strict')
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@cython.cfunc
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def tounicode_with_length(
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        s: cython.p_char, length: cython.size_t) -> str:
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    return s[:length].decode('UTF-8', 'strict')
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@cython.cfunc
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def tounicode_with_length_and_free(
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        s: cython.p_char, length: cython.size_t) -> str:
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    try:
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        return s[:length].decode('UTF-8', 'strict')
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    finally:
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        free(s)
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