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A `BSTR` is similar to a `zend_string`; it stores the length of the string just before the actual string, and thus the string may contain NUL bytes. However, `php_com_olestring_to_string()` is supposed to deal with arbitrary `OLECHAR*`s which may not be `BSTR`s, so we introduce `php_com_bstr_to_string()` and use it for the only case where we actually have to deal with `BSTR`s which may contain NUL bytes. Contrary to `php_com_olestring_to_string()` we return a `zend_string`, so we can save the re-allocation when converting to a `zval`. We also cater to `php_com_string_to_olestring()` not being binary safe, with basically the same fix we did for `php_com_olestring_to_string()`.