cython

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from libc.stdlib cimport free
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cdef str tounicode(char* s):
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    return s.decode('UTF-8', 'strict')
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cdef str tounicode_with_length(
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        char* s, size_t length):
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    return s[:length].decode('UTF-8', 'strict')
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cdef str tounicode_with_length_and_free(
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        char* s, size_t length):
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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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